296-3241-r02 Pdo Fahud Stage II Bra Rev 0

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Fahud Stage I and II BRA Report

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Document Title Fahud Facilities Stage I and II Building Risk AssessmentReport

Client Petroleum Development Oman (PDO)

Document Number 296-3241-R02

Job Number

296-3241

Rev Date Issue Prepared Reviewed Approved

A

0

December 07

March 08

Draft

Final

Vijaya Kumar

Vijaya Kumar

John King

Laurent Depooter

Hugh Miller

Hugh Miller




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Report Approval and Revision Record 2

Table of Contents 3

List of Tables 6

List of Figures 7

Executive Summary 8

Acronyms and Abbreviations 10

1.0

Introduction 11

2.0 Scope Of Work 12

2.1 Facilities Location 12

2.2 Fahud B Gathering Station 12

2.2.1 Facility Location 12

2.2.2 Facility History 12

2 2 3

Function of the Facility 12

2 3 F h d C G th i St ti 13




2.9.3

Facility Function 17

2.10 Buildings 17

2.10.1 Vulnerability of occupants 17

2.10.2 Building Types 17

2.10.3 Overpressure Damage for Building types 17

2.10.4 Overpressure damage and Vulnerability relationship 18

2.10.5 Identification of Buildings for Modelling 18

3.0

Stage I Assessment 20

3.1 Basis 20

3.2 Screening Criterion 20

3.2.1 Occupancy Screening 20

3.2.2 Functional Significance Screening 20

3.3 Stage I Results 21

4.0 Stage II Assessment Methodology 24

4.1 Hazard Identification Process 24

4.2 Major Assumptions 24

4.3 Weather Condition and Meteorological Data 24

4.4 Modelling Criteria 24

4.5 Modelling Input Data 25

4.5.1 Release Sizes and Durations 26

4.5.2 Inventory Analysis 26

4 5 3

Process Block Definition 29




Appendix F – Congested areas 110

Appendix G – Hazard to Building Distances 114

Appendix H – BRA II Assessment Sheets 123

Appendix I – Plot plans showing assessed buildings 165




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Table 2-1 – Building type descriptions ................................................................................ 17

Table 2-2 –Building list for Stage I BRA.............................................................................. 19

Table 3-1 – Stage I BRA Results ........................................................................................ 21

Table 4-1 – Impact Criteria for Flammable Gas Dispersion................................................. 25

Table 4-2 – Impact Criteria for Exposure to Hydrogen Sulphide.......................................... 25

Table 4-3 – Impact Criteria for Thermal Radiation............................................................... 25

Table 4-4 – Impact Criteria for Blast Overpressure for Stage II BRA................................... 25

Table 4-5 – Flammable characteristics ............................................................................... 28

Table 4-6 – Summary of Fahud facility congested area ...................................................... 31

Table 4-7 – Flammable dispersion summary ...................................................................... 33

Table 4-8 – Jet fire summary .............................................................................................. 35

Table 4-9 – Distance to thermal radiation impact ................................................................ 37

Table 4-10 – H2S dispersion summary................................................................................ 38

Table 4-11 – Stage II Building Identification........................................................................ 41

Table 4-12 – Summary of Stage II BRA results................................................................... 44




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Figure 2-1 – Field Layout Plan............................................................................................ 12

Figure 4-1 – Typical overpressure profile (Fahud B, CA:02)................................................ 32

Figure 4-2 – Typical flammable dispersion profile (Fahud B23)........................................... 34

Figure 4-3 – Typical Jet Fire thermal radiation contours (Fahud B23)................................. 36

Figure 4-4 – Typical toxic dispersion contours (Fahud B23)................................................ 40




EExxeeccuuttiivvee SSuummmmaar r yy Petroleum Development Oman (PDO) are in the process of upgrading their facilitiesacross their Northern Directorate. As a part of their Hazard ManagementProgramme, they have requested Vectra Middle East (VME) to carry out BuildingRisk Assessments (BRA) on various facilities.

The approach to the Stage I & II BRA will be standard methodology in compliance

with API 752 and API 753 to assess the risk by using specific Shell programsincluding CAM2 methodology for explosions.

This report summarises the methodologies adopted to evaluate the consequencesassociated with hazards arising from the Fahud Facilities. Outputs from theconsequence models are presented in the Appendices.

Flammable dispersion

Examination of the results demonstrates that flammable vapour clouds potentially

impact every single building under 1.5F wind category. This is expected for buildingsthat are within a facility handling large volumes of flammable gas.

The distances reported for indoor concentrations of 0.25 LFL are based upon anoutdoor concentration of 0.4 LFL, which is in turn based upon a building exchangerate of 2 air changes per hour and a 30-minute exposure time. This does not allow forprotective measures in place to prevent the ingress of flammable atmospheres intobuildings, such as an HVAC system.

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Overall Conclusion

All buildings have the potential to be impacted outside to a flammable vapour cloudconcentration of 0.5 LFL. On the basis of 2 air changes per hour then all buildingscan also be impacted inside.

No building is potentially impacted by a toxic release to the stated criteria of 30 ppm,100 ppm and 300 ppm.

Two buildings in Nahada1, one building in Nahada2, one building in MLPS and onebuilding in Natih are impacted by 10 ppm.

It is recommended that all the buildings studied in this Stage II BRA be reviewed fortheir ability to protect the occupants from flammable gas ingress. Protection of thebuilding occupants from flammable gas ingress will also protect them from toxic gasingress.

Additionally the buildings design should be reviewed to confirm their ability towithstand the impact from thermal radiation to the level of 37.5 kW/m2 for the

durations likely given the activation times required for the Emergency ShutdownSystem.

The congested area model assessment concluded that none of the identifiedbuildings at Fahud are impacted from the overpressure

If the buildings are to be used for temporary refuge in a serious emergency situation,the Emergency Response Plans should be reviewed for adequacy of dealing withflammable releases within the buildings.

P t bl b ildi i




AAccr r oonnyymmss aanndd AAbbbbr r eevviiaattiioonnss API American Petroleum Institute

BRA Building Risk Assessment

CA Congested Area

CAM Congested Area Model

ERPG Emergency Response Planning Guideline

ESD Emergency Shut Down

FRED Fire, Release, Explosion, Dispersion.

HAZID Hazard Identification

HVAC Heating, Vacuum, Air Conditioning

ID Immediate dilution

KO Knock Out

LFL Lower Flammable Limits

LRVC Liquid Ring Vacuum Compressor

MCF Multi-Component Flowmeter

MLPS Main Line Pumping Station

MPFM M lti Ph Fl t




1.0 Introduction

Petroleum Development Oman (PDO) have requested Vectra Middle East (Vectra) tocarry out a Building Risk Assessment (BRA) Stages I and II on the Fahud Facilities inthe Northern Directorate. This BRA will include the following facilities:

o Fahud B

o Fahud C

o Fahud D

o Fahud E

o Fahud F

o Fahud MLPS & NOCS

o Nahada I & Nahada II

o Natih

BRAs are normally carried out in three stages and this, being the Stage II BRAfocuses on the consequence assessment including Congested Area Modelling(CAM2).

The hazards associated with each zone within the Fahud facilities are dependent onthe hazardous inventories within that zone. These inventories, hence the hazards tobe modelled, are defined and supplemented by a detailed inventory calculation.




2.0 Scope Of Work

2.1 Facilities Location

The Fahud B, Fahud C, Fahud D, Fahud E, Fahud F, Fahud MLPS - NOCS, Nahada1, Nahada 2 and Natih stations are part of the North Oman (Fahud) operating area.

See Figure 2-1 for field facilities location details.Figure 2-1 – Field Layout Plan




The Solar compressors discharge gas into the HP Grid at a pressure ofapproximately 4800 kPa. Gas lift and gas injection at B Station are supplied from theHP Gas Grid.

The Demag blowers compress the remaining gas to a pressure of 276 kPa. This gasis routed via the LP Grid to F Station.

2.3 Fahud C Gathering Station

2.3.1 Facility Location

The station is located 1.7 km west of the Fahud MLPS.

2.3.2 Facility History

Oil and gas production from the Fahud-C area started in 1969. The present facilityconfiguration of manifolds, separators and gas compressors was established in 1982.

2.3.3 Facility Function

The Fahud-C Gathering station gathers the oil, gas and water produced from wells inthe Fahud-C area. The oil water emulsion is evacuated to Fahud MLPS. Gas iscompressed and fed either into the H.P grid or partly exported as L.P gas to Fahud-FGas Compression Station through blowers.

2.4 Fahud D Gathering Station





Well fluids enter Fahud E Station via individual flowlines into on-plot manifolds. Thewell fluids are then distributed between four 2-phase Production Separators. Two 3-phase Test Separators and one multiphase flow metering unit are provided for testingof individual wells. The liquid discharging from the bulk and test separators andMPFM is fed into three atmospheric surge tanks. The liquid leaving these tanks ispumped by centrifugal pumps to Fahud MLPS. The gas discharging from theproduction/test separators is preferentially fed to two gas turbine driven Solarcompressors, the remaining excess gas being directed to two electrically drivenDemag blowers. The Solar compressors discharge gas into the HP Grid at apressure of approximately 4200 kPa. Gas lift and gas injection at E Station aresupplied from the HP Gas Grid. The Demag blowers compress the remaining gas toa pressure of 276 kPa. This gas is routed to F station.

2.6 Fahud F Gathering Station


The Fahud F Compression Station is part of the North Oman operating area and isapproximately 250 km WSW of Mina Al Fahal.


Oil and gas production from the Fahud field started in 1967. The Fahud FCompression Station was completed in 1982/83 with three compressors. The station





Fahud NOCS (CSP) plant receives dehydrated “live” crude from Yibal and Lekhwairthrough MLPS/NOCS manifold system. The wet crude from Natih and Fahud isdehydrated in the six dehydration tanks at MLPS before pumping into the NOCSinlet.

The whole of the North Oman crude is stabilized at the CSP using Liquid RingVacuum Compressor (LRVC) to control the sub-atmospheric true vapour pressure of

the crude oil stream flowing out of Fahud to MAF. This is necessary to provideprotection to the floating roof storage tanks at MAF. The MAF tanks receive stabilizedcrude from the both Qarn Alam VFP and Fahud CSP through Nahada pumpingstation. Another objective of the overall facility is to enhance the hydrocarbonrecovery thereby reducing flaring at the interior location. Vapour pressure control ofthe incoming live crude is achieved via a single stage vacuum flash operation, whichremoves the lighter hydrocarbons from the crude stream. The flashed gas iscompressed and cooled to produce a liquid feed stream for the stabiliser column

which removes methane and ethane components. The removal of methane andethane allows retention of increased volumes of more stable propane, butane andpentane components in the liquid phase thereby increasing the overall hydrocarbonrecovery whilst maintaining the sub-atmospheric vapour pressure for safe storage,thus it meets both objectives.

The off gas from the overall process plant is primarily fed to the Fahud Power Plantas fuel, in order to ensure its operational integrity.

Prior to the current project B.I. No. 94.032F (Fahud Fuel Gas System) was approved




receiving temperature. The lighter gases from the stabiliser top are routed either toFahud Power Plant as fuel or to an air assisted elevated flare system.

2.8 Fahud Nahada 1 & Nahada 2 Booster Stations


The Nahada-1 and Nahada-2 Booster Stations are located at the confluence of the

Fahud and Qarn Alam streams of the main oil line at 80 Km North East of FahudMLPS. The Qarn Alam stream contains all the oil produced from South and CentralOman whilst the Fahud stream has the output from Northern fields.

For the purpose of identification, the old booster station is referred to as Nahada-1and the new one as Nahada-2 booster station.

Nahada-1 and Nahada-2 booster stations are located 100 m apart (fence to fence)and are designed to operate independently.


The Nahada-1 Booster station was commissioned in 1981 with three gas turbinedriven booster pumps P-5501, P-5502 & P-5503 for primarily boosting Qarn Alamstream. In 1988 the facility was expanded by the addition of a fourth pump P-5504.The fifth pump P-5505 was added in 1992. A new mode of operation with Nahada-1Booster station boosting only the Fahud crude was adopted in January 1993. Thisrequired the station to operate continuously. To make the booster station morereliable a sixth pump was installed in 1994. The Nahada-2 Booster station was





The Natih Gathering station gathers the oil, gas and water produced from wells in theNatih area. The liquid oil with water is evacuated to Fahud MLPS and water to rigs.Gas is compressed and fed either to the gas lift header or to gas injection wellsthrough booster compressors.

2.10 Buildings

Damage categorization for buildings and vulnerability of occupants to explosionoverpressure is explained as below:

2.10.1 Vulnerability of occupants

To assess the vulnerability of occupants within a given building from explosionoverpressure, the following information is required.

o Type of building

o Overpressure relationship for each type of building

o Damage-vulnerability relationship

2.10.2 Building Types

Buildings within the facilities have a wide range of design and construction features,however, the most important is building structure. The following types of majorstructure can be found:




o Steel frame with metal siding, B2: The frame in this type of buildingprovides support to the roof, which is independent of walls. Information isavailable in the literature on explosion performance from war records.These records indicate that sheeting is ripped off and internal walls aredamaged at overpressures> 1.5 PSI; the building frame stands butcladding and walls are damaged at > 2.5 PSI, and complete buildingcollapse occurs at >5 PSI

o Brick, un-reinforced masonry, B3: This type of building is similar todomestic /small commercial buildings. The walls collapse about 1.0 PSIand total building collapse occurs about 1.5 PSI

o Steel or concrete frame, with masonry fill or cladding, B4: This type ofbuilding regularly suffers damage in storm conditions: however, this typeof building provides robust performance under explosion loading. Walldamage may occur at 1.0 PSI. The roof slab may collapse at 2.0 PSI andtotal building collapse at 2.5 PSI

o Blast resistant, reinforced concrete, B5: The building is generallydesigned for 2.0 PSI, so very minor damage will occur. The roof and wallswill deflect under loading and internal wall damage at about 4.0 PSI .Thebuilding has major damage and possible collapse at 6.0 PSI

2.10.4 Overpressure damage and Vulnerability relationship

Assumptions on the relationship between damage and vulnerability of occupants(probability of fatality) were derived from several sources. The following general data




Table 2-2 –Building list for Stage I BRA

Bldg ID Name of Building Area #

1 Booster pump 2 CR Nahada 2

2 Switch room 2 Nahada 2

3 Booster pumps CR 1 Nahada 1

4 Switch room 1 Nahada 1

5 Police station across the road Nahada 1

6 Government gas control room Nahada 1

7 CCR Natih

8 Rest room Natih

9 Old mess (tool storeroom) Natih

10 Electric switch room Natih

11 Instruments/switch room next to CCR Natih

12 CCR MLPS

13 Substation MLPS




3.0 Stage I Assessment

3.1 Basis

API 752 [1] provides a methodology for identifying buildings on a process plant thatare potentially at risk from hydrocarbon releases. The hazard associated withindividual releases may manifest itself as a vapour cloud explosion, fire hazard or

generation of a flammable or toxic cloud.

The standard requires that a building risk assessment be undertaken in three distinctstages involving, identification of buildings at risk, potential consequences resultingfrom credible releases and finally, a risk assessment.

3.2 Screening Criterion

3.2.1 Occupancy Screening

A stage-two building evaluation is required if a building is considered occupied. Abuilding is considered occupied, for the purposes of occupancy screening, if thebuilding occupancy load is 300 or more man-hours per week or if, during peakoccupancy, 5 people or more are routinely expected in the building for at least onehour.

3.2.2 Functional Significance Screening




Report Number: 296-3241-R02

Revision: 0

March 2008

of 175

Location Input

Bldg

ID Name of Building Area #

Peak

Occupancy

Occupancy

[man hrs /week]

Occupied

Functionally

Significant

Building

Type BRA II ?

13 Substation MLPS 2 14 No Yes B4 Yes

14 Accommodation buildings MLPS 40 3500 Yes No B4 Yes

15 Administration Building MLPS 100 7056 Yes No B4 Yes

16 Analyser cabinet NOCS 1 2 No No B1 No

17 Instrument building NOCS 2 14 No Yes B4 Yes

18Permit office for water inj

plant (disused)NOCS 0 0 No No B1 No

19 Water Inj Shed (disused) NOCS 0 0 No No B3 No

20 CCR-Switch room Fahud B 4 140 No Yes B4 Yes

21 CCR Fahud C 4 140 No Yes B4 Yes

22 Switch room Fahud C 2 4 No Yes B4 Yes

23 CCR Fahud F 4 70 No Yes B4 Yes

24 CCR Fahud D 5 280 Yes Yes B4 Yes

25 Switch room Fahud D 2 6 No Yes B4 Yes

26 New CR and switch room Fahud D ? 0 Yes No B4 Yes

27 New CCR Fahud E 4 140 No Yes B4 Yes





Revision: 0

March 2008

of 175

Location Input

Bldg

ID Name of Building Area #

Peak

Occupancy

Occupancy

[man hrs /week] Occupied

Functionally

Significant

Building

Type BRA II ?

28 Old CCR/switch room Fahud E 2 6 No No B4 No

29 New switch room Fahud E 2 4 No Yes B4 Yes




4.0 Stage II Assessment Methodology

The Stage II Building Risk Assessment has been carried out in accordance with API752 standards.

The Major Accident Hazard events identified during the HAZID are taken forward intoBRA for evaluation of the severity of harm or damage being caused, together with thevalue judgments made concerning the significance of the results.

4.1 Hazard Identification Process

A desktop Hazard Identification (HAZID) study has been performed to identify anypotential major hazards, which may arise at the Fahud Facilities. The study wasbased upon a review of site data including plot plans, process flow diagrams andheat & mass balance data for the facilities, in conjunction with a site visit.

The HAZID output will be used as a part of the Stage II BRA for the Fahud Facilities.The HAZID process identified hazard sources. The HAZID summary is shown in Appendix B of this report.

4.2 Major Assumptions

The consequence modelling for hazards associated with explosions, fires, f lammablecloud, and toxic releases for Stage II BRA was carried out using Shell FRED




Impact criteria have been specified in the Method Statement and were agreed withPDO. The criteria are summarized in Table 4-1 to Table 4-4. Please note that theexplosion response largely depends on the type of building.

Table 4-1 – Impact Criteria for Flammable Gas Dispersion

Flammable limit Impact

0.5 LFL Outdoor limit

0.25 LFL Indoor limit

Table 4-2 – Impact Criteria for Exposure to Hydrogen Sulphide

H2S Concentration (ppm) Impact

10 Alarm level for H2S detectors

30 ERPG-2 threshold (for 60 min exposure)

100 Indicative of 1% fatality (for 30 min exposure)300 For information only

Table 4-3 – Impact Criteria for Thermal Radiation

Thermal Flux (kW/m2) Impact

37.5 Indicative of total asset loss (100% fatality)

12.5 Indicative of piloted ignition for susceptible




been obtained from the Process Flow Schemes, Process Engineering Flow Schemesand accompanying mass balances provided by and is documented in the inventorycalculations.

4.5.1 Release Sizes and Durations

The effect of inventory isolation has been considered in assessing the impact ofhazards. The isolation consists of shutdown of pumps and closure of isolation valves.

To model this, the consequence assessments are required to consider scenarios forcases where isolation has occurred. This will have a time factor associated with itdue to detection time (by fire or gas detectors, instruments or by operators), action(manual remote operation by the control room) and the shutdown of pumps andclosure of valves.

For the Stage II BRA, only large releases and ruptures are considered (full borerupture for pipes up to 6” diameter and 6” diameter holes for pipes larger than 6“diameter), ESD is assumed to have occurred 2 minutes after a potential release.

In general a release from a liquid system will be at its worst case early in a release.The effects distances tend to reach their equilibrium condition relatively quickly, afterwhich time the pressure has quickly subsided, and then equilibrium distances reduceas the source of material for release reduces.

To model a liquid release the volume available for release was calculated by themaximum flow release (peak pressure) for 2 minutes. The purpose of this is tosimulate the fact that the impact reduces with time. It also represents a release at its




release. Inclusion of water in the model leads to problems with the software, andinaccurate results, or no results are produced.




Table 4-5 – Flammable characteristics

Facility Stream No LFL, ppm 0.4 LFL, ppm 0.5 LFL, ppm

Fahud B SER B 36267 14506.8 18133.5

Fahud B B2 15504 6201.6 7752

Fahud B B 31 12304 4921.6 6152

Fahud B B 23 41196 16478.4 20598

Fahud B B 23A 41196 16478.4 20598

Fahud C NWRC 36570 14628 18285

Fahud C C2 15504 6201.6 7752

Fahud C C23 41196 16478.4 20598

Fahud D NWRD 36570 14628 18285

Fahud D D2 15504 6201.6 7752

Fahud D D31 12304 4921.6 6152

Fahud D D23 41196 16478.4 20598

Fahud E NWRE 36267 14506.8 18133.5

Fahud E E2 15504 6201.6 7752




Facility Stream No LFL, ppm 0.4 LFL, ppm 0.5 LFL, ppm

Fahud Nahada 1 4 12909 5163.6 6454.5

Fahud Nahada 2 3 12909 5163.6 6454.5

Fahud Natih 1A 36570 14628 18285

Fahud Natih 2A 36570 14628 18285

Fahud Natih 3A 41196 16478.4 20598Fahud Natih 4A 41196 16478.4 20598

Fahud Natih 5A 12304 4921.6 6152

Fahud Natih 6A 12304 4921.6 6152

Note that 0.4 LFL is the target outdoor concentration to obtain an indoorconcentration of 0.25 LFL, given a building exchange rate of 2 air changes per hour

and an exposure time of 30 minutes.Stream numbers shown relate to stream numbers on mass balance data sheetsprovided.

4.5.3 Process Block Definition

Each inventory was divided into suitably sized process blocks. Each process blockwas defined by the following:

o




on the objects contained within the congested area. This congestion isspecified as a number of rows (grids) of obstacles of specified blockage inany one dimension. Appropriate number of grids for each congested areabased on the plot plan and information provided

o Blockage Ratio – The blockage ratio is the blockage on a 2D aspect (floorarea). The higher the ratio the more obstacles that are present on thefloor plan such as walls and equipment. The blockage ratio makesallowance for the drag influence. The higher the blockage ratio the higher

the drag influences. Typically smooth edged obstacles have less of a drageffect than sharp ones. Blockage ratios for each congested area areselected based on the plot plan and experience of performing similarstudies

o Obstacle Complexity – Obstacles have an effect on a gas explosion in twoprincipal ways. Firstly, as gas flows past an obstacle it generatesturbulence. Turbulence increases the burning rate of the gas. The secondis that the obstacles distort the flames, which distorts and potentiallyincrease the area affected by the explosion. There are 4 levels, these are:

1. Idealised arrangements of equipment, symmetrical and similarin diameter or very few obstacles, which may or may not be inan idealised arrangement.

2. More complex than level 1. Obstacles of varying size by anorder of magnitude.




4.5.5 Calculation of distance between buildings and hazard sources

The distance between the process blocks and the buildings and distance betweenthe congested areas and the buildings are calculated. These can then be comparedto the calculated consequence distances to establish if there is an impact or not. Thedistance from each hazard source is calculated to the edge of each building. Thecalculated distances are presented in Appendix G.

4.6 Shell FRED

Selected inventories have been modelled using FRED V5.0 software to assess theimpact for various LFL (0.25 LFL & 0.5 LFL), and thermal radiation (12.5 kW/m2 and37.5 kW/m2) from the process blocks and over pressurisation (70 mbar, 100 mbarand 275 mbar) from congested areas. Each result of LFL and Thermal radiation fromPBs and over pressurisation from CA is calculated to see the impact on the Buildingsidentified.

4.7 Explosion CAM2 Hazard Modelling

Listed in the table below are the congested areas for Fahud facilities with theircorresponding over pressure distances for the criteria stated in Section 4.4. Theseare input into the consequence assessment model.

Table 4-6 – Summary of Fahud facility congested area

Over pressure (mbar)




A typical overpressure profile for the CAM assessment is presented below.Figure 4-1 – Typical overpressure profile (Fahud B, CA:02)

4.8 Fire, Flammable and Toxic Hazard Modelling




4.8.1 Flammable dispersion results

The following table indicates the downwind distance that will have potential to causea fire hazard.

Table 4-7 – Flammable dispersion summary

Facility Stream No0.25 LFL (indoor)

(m)0.5 LFL (outdoor)

(m)

Fahud B SER B 120 95

Fahud B B2 150 115

Fahud B B31

Fahud B B23 184 140

Fahud B B23 A 50 44

Fahud C NWRC 120 91

Fahud C C2 150 115

Fahud C C23 185 140

Fahud D NWRD 120 90

Fahud D D2 150 115




Facility Stream No 0.25 LFL (indoor)(m)

0.5 LFL (outdoor)(m)

Fahud Nahada 1 4 1199 979


Fahud Natih 1A 80 65




Fahud Natih 5A


Note: Outdoor limit for flammable gas dispersion is 0.5 LFL.

Indoor limit for flammable gas dispersion is 0.25 LFL.Target outdoor concentration to achieve indoor concentration of 0.25 LFL is 0.4 LFLNote that B31, D31, E31, F26, 11B and 5Aare stabilised crude and the FREDdispersion model did not generate flammable dispersion distances.Note that 5B, 14 and 15 are low pressure so the FRED dispersion model did notgenerate flammable dispersion distances.

A typical dispersion profile is presented in the figure below:




4.8.2 Thermal radiation results

Jet flames

The following table reports the flame length calculated for each of the identifiedinventories. All the results are for a 6” release as all identified process blocks havepipes of 6” or greater.

Table 4-8 – Jet fire summary

Facility StreamNo

Flame length (m) Surface emissivepower (KW/m2)

Fahud B SER B 41 247

Fahud B B2 23 205

Fahud B B31 64 141

Fahud B B23 54 252

Fahud B B23 A 18 217

Fahud C NWRC 41 247

Fahud C C2 23 205

Fahud C C23 54 252

Fahud D NWRD 41 247




Facility StreamNo

Flame length (m) Surface emissivepower (KW/m2)

Fahud MLPS and NOCS 18 143 192









Note: The flame length (of frustum) is the length of flame where gas is burning, inmetres.

The surface emissive power is the amount of heat radiated from the surface of theflame.

A typical jet flame is presented in the following figure showing the radiation contoursof interest (12.5 and 37.5 kW/m2) as well as lower thermal radiation contours (notused in the assessment).




not input into the model. The representative mixtures are presented in Appendix D. All C7+ components are input into the model as heptane. The outcome of theanalysis is that all potential liquid releases will have a jet fire and concomitant poolfire. The jet fire is deemed the most far reaching, and hence has the greatest impactin the context of this assessment.

Thermal radiation Summary

The distances to thermal radiation contours of interest are reported in the followingtable. The effects distances are reported for 1.5F though wind speed and stabilitycategory has little impact on jet flames.

Table 4-9 – Distance to thermal radiation impact

Downwind distance (metres)Facility Stream No

12.5 kW/m2 37.5 kW/m2

Fahud B SER B 84 73

Fahud B B2 37 32

Fahud B B31 164 113

Fahud B B23 111 97

Fahud B B23 A 164 113

Fahud C NWRC 83 73

Fahud C C2 37 32




Downwind distance (metres)Facility Stream No

12.5 kW/m2 37.5 kW/m2




Fahud Nahada 1 4 281 217Fahud Nahada 2 3 281 225







4.8.3 Toxic dispersion results

Even though Fahud facilities contain no H2S, 0.01 percent of H2S is assumed forsome streams to demonstrate the dispersion distance in case of toxic release.




Downwind distance (metres)Facility Stream No H2S 10

ppmH2S 30

ppmH2S 100

ppmH2S 300

ppm

Fahud D NWRD 12 3 ID -

Fahud D D2

Fahud D D31

Fahud D D23 19 5 ID -

Fahud E NWRE 12 3 ID -

Fahud E E2

Fahud E E23 19 5 ID -

Fahud E E31

Fahud F A 16 4 ID -

Fahud F F26

Fahud F B

Fahud MLPS and NOCS 11B

Fahud MLPS and NOCS 1




Figure 4-4 – Typical toxic dispersion contours (Fahud B23, 30 and 100 ppm)

Figure 4-5– Typical toxic dispersion contours (Fahud B23, 10 and 300 ppm)




4.9 Stage II BRA Results and Discussion

The buildings identified for inclusion in the Stage II BRA are listed below. Theseoriginate from the screening process outlined in Table 3-1. Not that additionalbuilding s have been included in the Stage 2 assessment that were not included inthe Stage 1 assessment (buildings 30 to 41).

Table 4-11 – Stage II Building Identification

Bldg ID Name of Building FacilityBuilding

constructiontype

1 Booster pump 2 CR Fahud Nahada 2 B4

2 Switch room 2 Fahud Nahada 2 B4

3 Booster pumps CR 1 Fahud Nahada 1 B4

4 Switch room 1 Fahud Nahada 1 B4

5 Police station across the road Fahud Nahada 1 B4

7 CCR Fahud Natih B4

8 Rest room Fahud Natih B3

9 Old mess (tool storeroom) Fahud Natih B1




Bldg ID Name of Building FacilityBuilding

constructiontype

26 New CR and switch room Fahud D B4

27 New CCR Fahud E B4

28 Old CCR/switch room Fahud E B4

29 New switch room Fahud E B4

30 Main office Bldg (A)Fahud MLPS and

NOCSB4

31 New Control Bldg (B)Fahud MLPS and

NOCSB4

32 Generator Bldg (C)Fahud MLPS and

NOCS

B4

33Control room (D)

Fahud MLPS andNOCS

B4

34 Electrical switch room (E)Fahud MLPS and

NOCSB4

35 New switch room (F)Fahud MLPS and

NOCSB4




The numbers in each of the boxes represents the number of hazard sources thatcould impact the buildings: (e.g. ‘0’ indicates no sources are impacted to that buildingfrom any sources, and ‘9’ indicated there are 9 sources which are potentially affectingthat building).






Revision: 0

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of 175

Table 4-12 – Summary of Stage II BRA results

Facility

Bldg

ID Label

Build

ingType

0.25

LFL (Indoor)

0.5 LFL

(Outdoor)

10

ppmH2S

30

ppmH2S

100

ppmH2S

300

ppmH2S

12.5

Kw/m2

37.5

Kw/m2

70mbar

overpressure

100mbar

overpressur e

275mbar

overpressure

FahudNahada 2

1 Booster pump 2 CR B4 4 4 1 0 0 0 4 4 0 0 0

FahudNahada 2

2 Switch room 2 B4 4 4 0 0 0 0 4 4 0 0 0

FahudNahada 1

3 Booster pumps CR 1 B4 6 6 1 0 0 0 6 6 0 0 0

Fahud

Nahada 1 4 Switch room 1 B4 6 6 2 0 0 0 6 6 0 0 0

FahudNahada 1

5Police station across

the roadB4 6 6 0 0 0 0 6 0 0 0 0

Fahud Natih 7 CCR B4 13 11 0 0 0 0 13 13 0 0 0

Fahud Natih 8 Rest room B3 11 11 0 0 0 0 13 13 0 0 0

Fahud Natih 9Old mess (tool

storeroom)B1 11 11 0 0 0 0 13 13 0 0 0

Fahud Natih 10 Electric switch room B4 17 13 2 0 0 0 10 5 0 0 0

Fahud Natih 11 Instruments/switchroom next to CCR

B4 11 11 0 0 0 0 13 13 0 0 0

FahudMLPS and

12 CCR (12) (MLPS) B4 10 7 0 0 0 0 7 4 0 0 0






Revision: 0

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FacilityBldgID

LabelBuilding

Type

0.25LFL (Indoor)

0.5 LFL(Outdoor)

10ppmH2S

30ppmH2S

100ppmH2S

300ppmH2S

12.5Kw/m2

37.5Kw/m2

70mbarover

pressu

re

100mbarover

pressur

e

275mbarover

pressure

NOCS

FahudMLPS and

NOCS13

Substation (13)(MLPS)

B4 10 10 2 0 0 0 7 4 0 0 0

FahudMLPS and

NOCS

14 Accommodation

buildings (14) (MLPS)B4 10 4 0 0 0 0 4 4 0 0 0

FahudMLPS and

NOCS

15 Administration

Building (15) (MLPS)B4 10 10 0 0 0 0 7 7 0 0 0

FahudMLPS and

NOCS17

Instrument building(17) (NOCS)

B4 14 14 0 0 0 0 20 13 0 0 0

Fahud B 20CCR / Switch room

(20)B4 8 8 0 0 0 0 10 10 0 0 0

Fahud C 21 CCR (21) B4 9 9 0 0 0 0 7 7 0 0 0

Fahud C 22 Switch room (22) B4 9 9 0 0 0 0 7 7 0 0 0

Fahud F 23 Control Room (23) B4 4 4 0 0 0 0 7 4 0 0 0Fahud D 24 CCR (24) B4 9 9 0 0 0 0 9 9 0 0 0

Fahud D 25 Switch room (25) B4 9 9 0 0 0 0 9 9 0 0 0






Revision: 0

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FacilityBldgID

LabelBuilding

Type

0.25LFL (Indoor)

0.5 LFL(Outdoor)

10ppmH2S

30ppmH2S

100ppmH2S

300ppmH2S

12.5Kw/m2

37.5Kw/m2

70mbarover

pressu

re

100mbarover

pressur

e

275mbarover

pressure

Fahud D 26New CR and switch

room (26)B4 9 8 0 0 0 0 7 6 0 0 0

Fahud E 27 New CCR (27) B4 9 9 0 0 0 0 7 6 0 0 0

Fahud E 28Old CCR/switch room

(28)B4 9 9 0 0 0 0 8 7 0 0 0

Fahud E 29 New switch room (29) B4 9 9 0 0 0 0 6 5 0 0 0

FahudMLPS and

NOCS

30 Main office Bldg (A) B4 10 7 0 0 0 0 8 4 0 0 0

FahudMLPS and

NOCS

31 New Control Bldg (B) B4 10 10 0 0 0 0 10 7 0 0 0

FahudMLPS and

NOCS32 Generator Bldg (C) B4 11 10 0 0 0 0 20 11 0 0 0

FahudMLPS and

NOCS33 Control room (D) B4 14 14 0 0 0 0 17 13 0 0 0

FahudMLPS and

NOCS34

Electrical switch room(E)

B4 14 14 0 0 0 0 13 13 0 0 0






Revision: 0

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FacilityBldgID

LabelBuilding

Type

0.25LFL (Indoor)

0.5 LFL(Outdoor)

10ppmH2S

30ppmH2S

100ppmH2S

300ppmH2S

12.5Kw/m2

37.5Kw/m2

70mbarover

pressu

re

100mbarover

pressur

e

275mbarover

pressure

FahudMLPS and

NOCS

35 New switch room (F) B4 14 14 0 0 0 0 17 13 0 0 0

FahudMLPS and

NOCS

36WIP Control Bldg (G)

(demolished)B4 14 13 0 0 0 0 20 12 0 0 0

FahudMLPS and

NOCS

37 Unknown Bldg (H) B4 10 7 0 0 0 0 10 4 0 0 0

FahudMLPS and

NOCS38 Unknown Bldg (I) B4 10 4 0 0 0 0 7 1 0 0 0

FahudMLPS and

NOCS39 Unknown Bldg (J) B4 8 4 0 0 0 0 3 1 0 0 0

FahudMLPS and

NOCS

40 Unknown Bldg (K) B4 4 4 0 0 0 0 0 0 0 0 0

FahudMLPS andNOCS

41 RO building B4 13 12 0 0 0 0 24 13 0 0 0




4.9.1 Flammable dispersion

Examination of the results demonstrates that flammable vapour clouds potentiallyimpact every single building under 1.5F wind category. This is expected for buildingsthat are within a facility handling large volumes of flammable gas.

The distances reported for indoor concentrations of 0.25 LFL are based upon anoutdoor concentration of 0.4 LFL, which is in turn based upon a building exchangerate of 2 air changes per hour and a 30-minute exposure time. This does not allow for

protective measures in place to prevent the ingress of flammable atmospheres intobuildings, such as an HVAC system.

A flammable cloud outside a building will not impact the occupants upon ignition if thebuilding is designed to protect against the ingress of flammable gas and the buildingcan withstand the flash fire.

4.9.2 Toxic dispersion

Even though Fahud facilities contain no H2S, 0.01 percent of H2S is assumed forsome streams to demonstrate the dispersion distance in case of toxic release.

No building is potentially impacted by a toxic release to the stated criteria of 30 ppm,100 ppm and 300 ppm.

Two buildings in Nahada1, one building in Nahada2, one building in MLPS and onebuilding in Natih are potentially impacted by 10 ppm.

4.9.3 Thermal radiation




5.0 Conclusion

Overall Conclusion

All buildings have the potential to be impacted outside to a flammable vapour cloudconcentration of 0.5 LFL. On the basis of 2 air changes per hour then all buildingscan also be impacted inside.

Toxic dispersion could not impact any of the identified buildings.

It is recommended that all the buildings studied in this Stage II BRA be reviewed fortheir ability to protect the occupants from flammable gas ingress. Protection of thebuilding occupants from flammable gas ingress will also protect them from toxic gasingress, event though toxicity is concluded not to be an issue here.

Additionally the buildings design should be reviewed to confirm their ability towithstand the impact from thermal radiation to the level of 37.5 kW/m2 for thedurations likely given the activation times required for the Emergency Shutdown

System.The congested area model assessment concluded that none of the identifiedbuildings at Fahud are impacted from the overpressure.

If the buildings are to be used for temporary refuge in a serious emergency situation,the Emergency Response Plans should be reviewed for adequacy of dealing withflammable releases within the buildings.

Portable buildings issue:




6.0 References

[1] Management of Hazards Associated with Location of Process Plant Buildings- American Petroleum Institute, API Recommended Practice 752, SecondEdition, November 2003.

[2] Management of Hazards Associated with Location of Process Plant PortableBuildings- American Petroleum Institute, API Recommended Practice 753,

First Edition, June 2007.




AAppppeennddiixx AA – – BBRRAA 11 RReeccoor r dd SShheeeettss




Stage I Building Risk Assessment

BuildingNumber

1

Area Name Nahada 2

Building NameBooster pump 2

CR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:

PeakOccupancy (forat least onehour):

7 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent

Personnel TitlesNumberof Shifts

Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 5 70

Day Shift( k d)

0





BuildingNumber

2

Area Name Nahada 2

Building Name Switchroom 2

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:

PeakOccupancy(for at leastone hour):

3 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 0.5 7

Day Shift(weekend)

0





BuildingNumber

4

Area Name Nahada 1

Building Name Switchroom 1

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


3 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 0.5 7

Day Shift(weekend)

0





BuildingNumber

5

Area Name Nahada 1

Building NamePolice station

across the road

Building Type B4

Building

Structure

1 storey

Engineer: LGJD

Date:


6 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

0

Day Shift0





BuildingNumber

6

Area Name Nahada 1

Building NameGovernment gas

control room

Building Type B2

Building

Structure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 1 1 2

Day Shift0





BuildingNumber

7

Area Name Natih

Building Name CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


10 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 4 7 10 280

Day Shift(weekend)

0

F h d S I d II BRA R





BuildingNumber

8

Area Name Natih

Building Name Rest room

Building Type B3

BuildingStructure

1 storey

Engineer: LGJD

Date: 29/08/2007


10 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 4 7 1 28

Day Shift(weekend)

0

F h d St I d II BRA R t





BuildingNumber

9

Area Name Natih

Building NameOld mess (tool

storeroom)

Building Type B1

BuildingStructure

1 storey

Engineer: LGJD

Date:


10 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 10 7 2 140

Day Shift0






BuildingNumber

10

Area Name Natih

Building NameElectric

switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 3 1 6

Day Shift( k d)

0






BuildingNumber

11

Area Name Natih

BuildingName

Instruments/switchroomnext to CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 3 1 6

Day Shift0






BuildingNumber

12

Area Name MLPS

Building Name CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


6 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 5 8 80

Day Shift(weekend)

0





BuildingNumber

14

Area Name MLPS

Building Name Accomodation

buildings

Building Type B4

BuildingStructure

2 storey

Engineer: LGJD

Date:


40 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 10 7 10 700

Day Shift0






BuildingNumber

15

Area Name MLPS

Building Name Administration

Building

Building Type B4

BuildingStructure

2 storey

Engineer: LGJD

Date:


100 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 80 7 12 6720

Day Shift0




g p


BuildingNumber

16

Area Name NOCS

Building Name Analyser cabinet

Building Type B1

BuildingStructure

1 storey

Engineer: LGJD

Date:


1 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 1 3 0.5 1.5

Day Shift(weekend)

0




g p


BuildingNumber

17

Area Name NOCS

Building Name Instrument building

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 1 14

Day Shift(weekend)

0





BuildingNumber

18

Area Name NOCS

Building NamePermit office forwater inj plant

(disused)

Building Type B1

BuildingStructure 1 storey

Engineer: LGJD

Date: 29/08/2007


5people?(Y/N)

No

Occupancy

Data

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

0





BuildingNumber

19

Area Name NOCS

Building NameWater Inj Shed

(disused)

Building Type B3

BuildingStructure

1 storey

Engineer: LGJD

Date:


5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

0

Day Shift0





BuildingNumber

20

Area Name Fahud B

Building Name CCR-Switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


4 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 10 140

Day Shift(weekend)

0





BuildingNumber

21

Area Name Fahud C

Building Name CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


4 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 10 140

Day Shift(weekend)

0





BuildingNumber

22

Area Name Fahud C

Building Name Switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 2 1 4

Day Shift(weekend)

0





BuildingNumber

23

Area Name Fahud F

Building Name CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


4 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 1 7 10 70

Day Shift(weekend)

0





BuildingNumber

24

Area Name Fahud D

Building Name CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


5 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 4 7 10 280

Day Shift(weekend)

0





BuildingNumber

25

Area Name Fahud D

Building Name Switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 3 1 6

Day Shift(weekend)

0





BuildingNumber

26

Area Name Fahud D

Building NameNew CR and

switchroom ???

Building Type B2

BuildingStructure

1 storey

Engineer: LGJD

Date:


? 5people?(Y/N)

Yes

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

0

Day Shift0





BuildingNumber

27

Area Name Fahud E

Building Name New CCR

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


4 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 7 10 140

Day Shift(weekend)

0





BuildingNumber

28

Area Name Fahud E

Building NameOld

CCR/switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJD

Date:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 3 1 6

Day Shift( k d)

0





BuildingNumber

29

Area Name Fahud E

Building Name New switchroom

Building Type B4

BuildingStructure

1 storey

Engineer: LGJDDate:


2 5people?(Y/N)

No

OccupancyData

A B C D E

Activity orEvent


Numberof

Peopleper Shift

WorkingDays/Week

Hours/Shiftor

Hours/Event

ManHours

perWeek

Day Shift(weekday)

1 2 2 1 4

Day Shift(weekend)

0




AAppppeennddiixx BB – – HHAAZZIIDD SSuummmmaar r yy



Area of concern

Facility StreamThermalradiation

Hydrocarbongas dispersion

Toxic gasdispersion

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AAppppeennddiixx CC – – AAssssuummppttiioonnss SShh tt




In order to undertake the PDO Fahud Stage II BRA certain assumptions have to be made.

These form the rule set for the assessment.The assumptions are presented as assumption sheets, and are provided for:

001 Release coefficients

002 Isolation time

003 Hole size

004 Building exchange rates

005 Dispersion criteria

006 Toxic criteria

007 Jet flame criteria

008 Explosion criteria

009 Building pressure thresholds

010 Meteorological data

011 Surface Roughness




ASSUMPTION SHEET

PDO Fahud Building Risk Assessment

Assumption No.: 001 Revision: A Date: December 2007

Subject: Release coefficients

Assumption:

Discharge coefficient§ For liquids Cd=0.6§ For gases Cd=0.8§ All flows to be assumed to be from short frictionless pipes

Justification:

Recommended by the consequence modelling software and considered to be reasonable.




ASSUMPTION SHEET



Subject: Isolation time

Assumption:

Manual inventory isolation time assumed to be 30 minutes after start of a release. Automatic inventory isolation time assumed to be 2 minutes after start of a release. All isolations are assumed to be manual

Justification:

Conservative approximation




ASSUMPTION SHEET



Subject: Hole size

Assumption:

Release hole size for BRA Stage II consequence modelling shall be:

6” (150 mm) release, orFull bore rupture,

Whichever is the smaller

Justification:

Discussions with PDO




ASSUMPTION SHEET



Subject: Building exchange rates

Assumption:

Ventilation rate for all buildings will be taken as 2 Air Changes Per Hour (ACPH)

Justification:

In the absence of any specific information 2 ACPH is a standard ventilation rate and is thedefault value used in Shepherd.

References:

Standard approach




ASSUMPTION SHEET



Subject: Dispersion criteria

Assumption:

Outdoor limit for flammable gas dispersion is 0.5 LFL.

Indoor limit for flammable gas dispersion is 0.25 LFL.

Shell FRED will calculate the outdoor concentrations. The indoor concentrations will becalculated based upon building exchange rates, using the equation:

−⋅=

⋅− t

V

Q

e1CextCi




ASSUMPTION SHEET



Subject: Toxic criteria

Assumption:The only toxic material considered is hydrogen sulphide (H2S). Toxic end pointsconsidered are 10 ppm, 30 ppm, 100 ppm and 300 ppm (provided for information as perrequest). These are assumed as outdoor limits.

10 ppm is the concentration at which the alarms are set on site.

30 ppm is the ERPG-2 threshold for 60 minute exposure

100 ppm is indicative of 1% fatality for 30 minute exposure

Justification:

Standard Approach




ASSUMPTION SHEET



Subject: Jet flame criteria

Assumption:

Jet fires will be modelled to 12.5 and 37.5 kW/m2. These equate to:

Thermal Flux (kW/m2) Impact

37.5 Indicative of total asset loss (100% fatality)

12.5 Indicative of piloted ignition for susceptiblestructures (50% fatality)

Gas, liquid and 2-phase jets will be considered.

Justification:




ASSUMPTION SHEET



Subject: Explosion criteria

Assumption:

The CAM2 model within Shell FRED will be used.

The extent of congested regions will be determined using engineering judgement.

The area blockage ratios and number of grids will be based on the site visit andengineering judgement using the Unit Plot Plan.

Separation distances between buildings and explosion sources have been calculated fromcentre point to centre point. Average radiuses (from these points) where calculated usingvolume or area information then subtracted from the direct distance calculated point topoint. This applies to Stage II BRA – CAM only.

Justification:




ASSUMPTION SHEET



Subject: Building pressure thresholds

Assumption:

For Stage II assessment, the following blast resistance criteria will be used:

Building Type Impact Criteria(mbar)

Impact Description

B1 Wood Frame Trailer or

Shack

70 Isolated buildings

overturn, Roofs andwalls collapse

B2 Steel-framed/metal sidingpre-engineered

100 Sheeting ripped off,internal walls damaged;danger from fallingobjects.




ASSUMPTION SHEET



Subject: Meteorological data

Assumption:

Consequence analysis for the Stage II BRA will utilise F1.5 wind speed and stability only.

Temperature will be 20°CHumidity will be 70%

Pressure will be 1 bar

Justification:

Conservative (worst case) of F1.5 be used.




ASSUMPTION SHEET



Subject: Surface roughness

Assumption:

The surface roughness used is 0.1 m to reflect the open spaces between plant units

Justification:

Discussions with PDO

References:




ASSUMPTION SHEET



Subject: Study case

Assumption:

The Stage II BRA will use the worst-case streams for the study, based upon data suppliedon the Process Flow Schemes.

The worst-case material is defined first as the highest hydrogen sulphide content, and

second by the highest proportion of light hydrocarbons (methane as the most volatile).

Justification:

Ensures that the worst case is taken into account.

References:




ASSUMPTION SHEET


Assumption No.: 014 Revision: B Date: December 2007

Subject: Reference drawings and documents

Assumption:

The Stage II BRA will be based upon supplied drawings. There are a variety of dates ofissue and revision numbers, drawings are assumed to be correct.

Justification:

These are the latest revisions supplied to date.

References:




ASSUMPTION SHEET



Subject: Pool fires

Assumption:

Pool fires are included in Stage II BRA. These are compared to the concomitant jet fire,and the greater of the two will be used in the BRA.

Justification:

Worst case approach

References:




AAppppeennddiixx DD – – IInnvveennttoor r yy DDaattaa




Facility Equipment Inventory

Compressor package B23

Compressor package B23

Oil shipping pump B31

Oil shipping pump B31

Surge tank B2

Surge tank B2

Production separator SER BProduction separator SER B

Production separator SER B

Test separator SER B

Booster compressor B23 A

Fahud B

Booster compressor B23 A

Compressor package C23

Compressor package C23

Surge tank C2

Surge tank C2

Production separator NWRC



Fahud C





Test separator NWRE

Test separator NWRE

Gas compressor A

Gas compressor A

Gas compressor A

Gas compressor A

Atm flash tank F26

LP flash tank F26

Condensate recovery pumps F26

Fahud F

Slug catcher B

Crude oil booster pumps 11B



Vacuum separators 1

Vacuum separators 1Vacuum separators 1

Liquid ring vacuum compressorpackage

5B

Liquid ring vacuum compressorpackage

5B

Liquid ring vacuum compressor

MLPS & NOCS





Mainline pumps 18

Mainline pumps 18

Mainline pumps 18

Mainline Pump 4

Mainline Pump 4

Mainline Pump 4

Mainline Pump 4

Mainline Pump 4

Nahada 1

Mainline Pump 4

Booster Pump 3

Booster Pump 3

Booster Pump 3Nahada 2

Booster Pump 3

Production Separator 2A

Production Separator 2AProduction Separator 2A

Test Separators 1A

Test Separators 1A

Production Separator 2A

Gas Lift Compressor 3A

G Lift C 3A


Inventory Composition

Components in stream (%)

Facility StreamPressurekPa (a)

Pressurebar (a)

Temp CM th Eth P I b t b t t h h t H S




Revision: 0

March 2008

of 175

kPa (a) bar (a) Methane Ethane Propane Iso-butane n-butane n-pentane n-hexane n-heptane H2S

SER B 2700 26.73 60 77 8.5 5.5 1.5 2.5 2 0 3 0.01

B2 250 2.48 35 6 4 8 5 25 22 0 29 0

B 31 101 1.00 35 0 1 4 3 6 14 20 50 0

B 23 4751 47.04 30 81 9 6 1 2 1 0 0 0.01

Fahud B

B 23A 260 2.57 35 81 9 6 1 2 1 0 0 0

NWRC 2700 26.73 60 77 8.5 5 0 2.5 1.5 0 3 0.01

C2 250 2.48 35 6 4 8 5 25 22 0 29 0Fahud C

C23 4828 47.80 30 81 9 6 1 2 1 0 0 0.01

NWRD 2700 26.73 60 77 8.5 5 0 2.5 1.5 0 3 0.01

D2 250 2.48 35 6 4 8 5 25 22 0 29 0

D31 101 1.00 35 0 1 4 3 6 14 20 50 0Fahud D

D23 4773 47.26 30 81 9 6 1 2 1 0 0 0.01

NWRE 2700 26.73 60 77 8.5 5.5 1.5 2.5 2 0 3 0.01E2 250 2.48 35 6 4 8 5 25 22 0 29 0

E31 101 1.00 35 0 1 4 3 6 14 20 50 0.01Fahud E

E23 4831 47.83 30 81 9 6 1 2 1 0 0 0

A 5300 52.48 105 81 9 6 1 2 1 0 0 0.01

B 260 2.57 60 6 4 8 5 25 22 0 29 0Fahud F

F26 260 2.57 11.5 1 1 9 7 15 25 23 19 0

1 350 3.47 52 1 3 8 14 0 0 20 55 0

5B 180 1.78 60 1 20 30 20 0 0 10 10 0

11B 830 8.22 50 0 0 8 4 0 25 25 38 0

34 3100 30.69 39 81 9 6 1 2 0 0 0 0.01

24 3000 29.70 35 81 9 6 1 2 0 0 0 014 175 1.73 35 2 4 19 4 0 0 0 71 0

MLPS &NOCS

15 441 4.37 35 2 4 19 4 0 0 0 71 0


Components in stream (%)

Facility StreamPressurekPa (a)

Pressurebar (a)

Temp CMethane Ethane Propane Iso-butane n-butane n-pentane n-hexane n-heptane H2S




Revision: 0

March 2008

of 175

18 4000 39.60 35 2 4 19 4 0 0 0 71 0.01

Nahada 1 4 6601 65.36 25 2 4 18 4 0 0 0 71 0.01

Nahada 2 3 6723 66.56 25 2 4 18 4 0 0 0 71 0.011A 1100 10.89 50 77 8.5 5 0 2.5 1.5 0 3 0.01

2A 360 3.56 50 77 8.5 5 0 2.5 1.5 0 3 0

3A 5200 51.49 30 81 9 6 1 2 1 0 0 0

4A 7300 72.28 30 81 9 6 1 2 1 0 0 0.01

5A 1800 17.82 35 0 1 4 3 6 14 20 50 0

Natih

6A 3000 29.70 35 0 1 4 3 6 14 20 50 0.01




AAppppeennddiixx EE – – PPr r oocceessss BBlloocckkss




Facility ID Number Equipment Inventory X Y

K0513 Compressor package B23 45 67

K0514 Compressor package B23 45 90

P0501 Oil shipping pump B31 51 45

P0502 Oil shipping pump B31 56 45

T0501 Surge tank B2 0 49

T0502 Surge tank B2 0 49

V0501 Production separator SER B 9 27V0502 Production separator SER B 16 27

V0503 Production separator SER B 24 27

V0516 Test separator SER B 36 30

K5001 Booster compressor B23 A 52 110

Fahud B

K5002 Booster compressor B23 A 52 125

K0516 Compressor package C23 43 15

K0517 Compressor package C23 43 25

T0504 Surge tank C2 43 69

T0505 Surge tank C2 43 79

V0510 Production separator NWRC 21 69



V0531 Test separator NWRC 15 40

Fahud C




Facility ID Number Equipment Inventory X Y

K5701 Gas compressor A 64 52

K5702 Gas compressor A 64 69K5703 Gas compressor A 64 85

K5704 Gas compressor A 64 101

V5725 Atm flash tank F26 42 20

V5724 LP flash tank F26 67 20

PC01/02 Condensate recovery pumps F26 48 20

Fahud F

A5724 Slug catcher B 105 -37

P4101 Crude oil booster pumps 11B 352 227P4102 Crude oil booster pumps 11B 324 229

P4103 Crude oil booster pumps 11B 299 231

V4101 Vacuum separators 1 347 243



K4101Liquid ring vacuum compressorpackage

5B 336 211


5B 310 213


5B 285 215

K4104 Compressor package 24 248 220

P4107 Condensate pumps 34 252 236

MLPS & NOCS



AAppppeennddiixx FF – – CCoonnggeesstteedd aar r eeaass


Fahud B



Area Description[Complexity]

Dimension Region Size (m) Number of Grids Blockage Ratio

Length 18 2 0.2

Width 8 3 0.3CA01

[4]Height 6 2 0.4

Area Description

[Complexity]Dimension Region Size (m) Number of Grids Blockage Ratio

Length 15 2 0.2

Width 7 3 0.3CA02

[4]Height 5 2 0.4

Fahud C

Area Description



Fahud E



Area Description[Complexity]

Dimension Region Size (m) Number of Grids Blockage Ratio

Length 22 3 0.2

Width 8 2 0.3CA01

[4]Height 4 3 0.4

Fahud F

Area Description


Length 16 3 0.2

Width 8 3 0.3CA01

[4]Height 6 2 0.4

MLPS & NOCS

Area DescriptionDimension Region Size (m) Number of Grids Blockage Ratio


Based on material balance and process conditions following composition was designed to



represent the fuel for congested area assessment.

Component Mol %

Methane 65

Ethane 20

Propane 15




AAppppeennddiixx GG – – HHaazzaar r dd ttoo


Process Blocks to Building Distances



g

Fahud B

BldgID 1

Bldg X 62

Y 16

PB ID R 8

001 45 67 45

002 45 90 68

003 51 45 23

004 56 45 21

005 0 49 62

006 0 49 62

007 9 27 46

008 16 27 39

009 24 27 31

010 36 30 21


F h d D



Fahud D

BldgID 1 2 3

Bldg X 6 8 51

Y 32 23 -3

PB ID R 5 6 4001 44 27 33 31 27

002 54 27 43 41 26

003 70 48 61 61 50

004 75 48 66 66 52

005 48 70 52 56 69

006 48 80 59 64 79

007 25 70 38 44 73

008 25 62 31 37 66

009 25 54 24 30 59


009 27 77 80 57 85



010 20 50 52 30 58

011 33 50 55 37 58

Fahud F

Bldg ID 1

Bldg X 85

Y 139PB ID R 9

001 64 52 81

002 64 69 64

003 64 85 49

004 64 101 34

005 42 20 118

006 67 20 111

007 48 20 116008 105 -37 168

MLPS & NOCS

BldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


BldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17



ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Bldg X 572 447 474 539 255 597 553 569 238 218 241 310 620 643 664 706 465

Y 403 454 569 405 174 389 366 285 169 164 155 109 305 236 134 64.8 342

PB ID R 12 10 15 15 9 28 22 20 5 11 7 4 12 10 15 15 13

016 220 241 375 301 401 344 67 378 334 332 69 65 81 156 393 413 442 501 252

017 396 229 235 220 334 212 143 229 187 162 164 179 164 144 225 237 269 336 120

018 396 241 227 209 323 203 147 222 179 159 168 183 170 153 221 237 273 341 110019 396 250 221 200 314 196 152 217 174 157 172 187 174 161 219 238 277 346 103

020 396 220 242 229 343 219 140 235 193 165 161 176 161 136 228 238 266 331 128

021 396 208 250 241 355 228 137 243 201 170 158 173 157 127 232 239 263 326 138

022 405 250 214 198 312 190 160 209 166 148 181 195 182 166 210 228 269 338 97

023 412 218 233 229 343 211 155 225 183 151 176 191 175 145 214 222 250 316 123

024 456 218 206 226 338 190 197 194 156 112 218 233 217 178 174 178 209 278 112

025 456 171 247 273 384 233 193 232 196 141 213 228 208 154 200 188 196 256 158

026 500 171 230 277 384 222 236 211 180 113 257 271 252 196 168 147 153 217 162

027 500 218 187 232 338 176 240 169 136 77 261 276 259 215 137 134 169 241 117

028 546 171 221 289 390 219 283 196 173 96 303 318 299 240 141 106 108 177 176


Nahada 1



BldgID 1 2 3

Bldg X 11 21 -40

Y 18 27 260

PBID R 6 4 16

001 70 27 54 45 241

002 62 27 46 37 238

003 54 27 38 29 235004 78 27 62 53 245

005 86 27 70 61 249

006 94 27 78 69 252

Nahada 2

BldgID 1 2

Bldg X 134 75

Y 17 36

PB ID R 11 9


Natih



BldgID 1 2 3 4 5

Bldg X -14 -24 -38 54 -24

Y -83 -108 -110 67 -81

PB ID R 8 3 3 7 6

001 28 9 93 125 133 56 98

002 28 17 100 132 140 49 105

003 28 25 108 140 147 42 112

004 23 -6 77 109 117 72 83

005 24 -6 78 110 118 72 83

006 28 32 114 146 153 36 118

007 7 -43 37 69 78 112 43

008 17 -43 43 74 84 109 50

009 -52 -71 32 43 38 167 24

010 -52 -54 40 58 55 154 33

011 -8 -43 32 64 70 119 35


CAM to Building distances



Fahud B

BldgID 1 2

Bldg X 62 0

Y 16 0

PB ID R 8 0

01 12 35 45 3702 37 65 47 75

Fahud C

BldgID 1 2

Bldg X 4 6

Y 18 8

PB ID R 6 5

01 60 17 50 49

02 23 50 31 40

F h d D


Fahud F



BldgID 1

Bldg X 85

Y 139

PB ID R 9

01 39 102 50

MLPS & NOCS

BldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Bldg X 572 447 474 539 255 597 553 569 238 218 241 310 620 643 664 706 465

Y 403 454 569 405 174 389 366 285 169 164 155 109 305 236 134 64.8 342

PB ID R 12 10 15 15 9 28 22 20 5 11 7 4 12 10 15 15 13

01 87 47 589 533 636 562 201 586 543 518 190 165 180 227 580 577 568 604 467

Nahada 1

No Congested Area

Nahada 2




AAppppeennddiixx HH – – BBRRAA IIII


Fahud B



0.25 LFL

Bldg IDBldgID 1

Type Type B4

PBID

0.25LFL

001 184 H

002 184 H

003 0 -

004 0 -

005 150 H

006 150 H

007 120 H

008 120 H

009 120 H010 120 H

011 50 -

012 50 -

0.5 LFL


10 ppm H2S



Bldg IDBldgID 1

Type Type B4

PBID

10ppm

001 19 -

002 19 -

003 0 -

004 0 -

005 0 -

006 0 -

007 12 -

008 12 -

009 12 -

010 12 -

30 ppm H2S

Bldg


ID ppm

001 ID -



002 ID -

003 0 -

004 0 -

005 0 -

006 0 -

007 ID -

008 ID -

009 ID -010 ID -

011 0 -

012 0 -

300 ppm H2S

Bldg ID BldgID 1

Type Type B4

PBID

300ppm

001 0 -


Thermal radiation 12.5kW/m2



Bldg ID BldgID 1

Type Type B4

PBID

12.5

001 111 H

002 111 H

003 164 H

004 164 H

005 37 -

006 37 -

007 84 H

008 84 H

009 84 H

010 84 H

011 164 H012 164 H


Bldg IDBldgID 1


CAM 100 mbar



Bldg IDBldgID 1

Type Type B4

CAID

100mbar

01 6 -

02 4.5 -

CAM 275 mbar

Bldg IDBldgID 1

Type Type B4

CAID

275mbar

01 0 -02 0 -


Fahud C0.25 LFL



Bldg IDBldgID 1 2

Type Type B4 B4

PBID

0.25LFL

001 185 H H

002 185 H H

003 150 H H

004 150 H H

005 120 H H

006 120 H H

007 120 H H

008 120 H H

009 120 H H

0.5 LFL

Bldg IDBldgID 1 2

Type Type B4 B4

PB 0 5


007 12 - -

008 12 - -



009 12 - -

30 ppm H2S

Bldg IDBldgID 1 2

Type Type B4 B4

PBID

30ppm

001 5

002 5

003 0 - -

004 0 - -

005 3 - -

006 3 - -

007 3 - -

008 3 - -

009 3 - -

100 ppm H2S


003 0 - -

004 0 - -



005 0 - -

006 0 - -

007 0 - -

008 0 - -

009 0 - -


Bldg IDBldgID 1 2

Type Type B4 B4

PBID

12.5

001 112 H H

002 112 H H

003 37 - -

004 37 - -

005 83 H H

006 83 H H

007 83 H H


CAID

70mbar



01 11.5 - -02 11.5 - -

CAM 100 mbar

Bldg IDBldgID 1 2

Type Type B4 B4

CAID

100mbar

01 5.5 - -

02 5.5 - -

CAM 275 mbar

Bldg IDBldgID 1 2

Type Type B4 B4

CAID

275mbar

01 0 - -


Fahud D

0 25 LFL



0.25 LFL

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

PBID

0.25LFL

001 184 H H H

002 184 H H H003 0 - - -

004 0 - - -

005 150 H H H

006 150 H H H

007 120 H H H

008 120 H H H

009 120 H H H

010 120 H H H

011 120 H H H

0.5 LFL

Bldg


002 19 - - -

003 0 - - -

004 0



004 0 - - -005 0 - - -

006 0 - - -

007 12 - - -

008 12 - - -

009 12 - - -

010 12 - - -

011 12 - - -

30 ppm H2S

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

PBID

30ppm

001 5 - - -

002 5 - - -

003 0 - - -

004 0 - - -


011 ID - - -



300 ppm H2S

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

PBID

300ppm

001 0 - - -002 0 - - -

003 0 - - -

004 0 - - -

005 0 - - -

006 0 - - -

007 0 - - -

008 0 - - -

009 0 - - -

010 0 - - -

011 0 - - -

Thermal radiation 12 5kW/m2


ID

001 97 H H H

002 97 H H H



002 97 H H H003 113 H H H

004 113 H H H

005 32 - - -

006 32 - - -

007 73 H H -

008 73 H H H

009 73 H H H

010 73 H H -

011 73 H H -

CAM 70 mbar

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

CAID

70mbar

01 7.5 - - -


Type Type B4 B4 B4

PB

ID

0.25

LFL



ID LFL001 185 H H H

002 185 H H H

003 0 - - -

004 0 - - -

005 150 H H H

006 150 H H H

007 120 H H H

008 120 H H H

009 120 H H H

010 120 H H H

011 120 H H H

0.5 LFL

Bldg ID BldgID 1 2 3

Type Type B4 B4 B4

PBID

0.5LFL

001 140 H H H


008 12 - - -

009 12 - - -

010 12 - - -



010 12 - - -011 12 - - -

30 ppm H2S

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4PBID

30ppm

001 5 - - -

002 5 - - -

003 0 - - -

004 0 - - -

005 0 - - -

006 0 - - -

007 3 - - -

008 3 - - -

009 3 - - -

010 3 - - -


Type Type B4 B4 B4

PB

ID

300

ppm



ID ppm001 0 - - -

002 0 - - -

003 0 - - -

004 0 - - -

005 0 - - -

006 0 - - -

007 0 - - -

008 0 - - -

009 0 - - -

010 0 - - -

011 0 - - -


Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

PBID

12.5


006 32 - - -

007 73 H H H

008 73 H H -



008 73 H H 009 73 - H -

010 73 H H H

011 73 H H H

CAM 70 mbar

Bldg IDBldg

ID 1 2 3Type Type B4 B4 B4

CAID

70mbar

01 23 - - -

CAM 100 mbar


Type Type B4 B4 B4

CAID

100mbar

01 14 - - -


007 0 -

008 130 -



0.5 LFL

Bldg IDBldgID 1

Type Type B4

PBID

0.5LFL

001 90 H002 90 H

003 90 H

004 90 H

005 0 -

006 0 -

007 0 -

008 100 -

10 ppm H2S

Bldg IDBldgID 1

Type Type B4


007 0 -

008 0 -

100 H S



100 ppm H2S

Bldg IDBldgID 1

Type Type B4

PBID

100ppm

001 ID -002 ID -

003 ID -

004 ID -

005 0 -

006 0 -

007 0 -

008 0 -

300 ppm H2S

Bldg IDBldgID 1

Type Type B4


006 130 H

007 130 H

008 38 -




Bldg IDBldgID 1

Type Type B4

PB

ID

37.5

001 91 H

002 91 H

003 91 H

004 91 H

005 97 -

006 97 -

007 97 -

008 28 -

CAM 70 mbar

Bldg


MLPS & NOCS

0.25 LFL



Bldg IDBldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Type Type B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4

PBID

0.25LFL

001 0 - - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - - -003 0 - - - - - - - - - - - - - - - - -

004 215 - - - - H - - H H H H H - - - - H

005 215 - - - - H - - - H H H H - - - - H

006 215 - - - - H - - - H H H H - - - - H

007 0 - - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - - -

010 125 - - - - H - - - H H H H - - - - -

011 445 H H H H H H H H H H H H H H H - H



014 445 H H H H H H H H H H H H H H - - H


0.5 LFL

Bld IDBldg



Bldg IDBldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


PBID

0.5LFL

001 0 - - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - - -

003 0 - - - - - - - - - - - - - - - - -004 165 - - - - H - - - H H H H - - - - H

005 165 - - - - H - - - H H H H - - - - H

006 165 - - - - H - - - H H H H - - - - -

007 0 - - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - - -

010 95 - - - - H - - - H H H - - - - - -

011 370 H H - H H H H H H H H H H - - - H

012 370 H H - H H H H H H H H H H - - - H

013 370 H H - H H H H H H H H H H - - - H

014 370 - H - H H - H H H H H H - - - - H

015 370 - H - H H - H H H H H H - - - - H


10 ppm H2S

Bld IDBldg



Bldg IDg

ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Type Type B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4

PB ID10

ppm

001 0 - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - -

003 0 - - - - - - - - - - - - - - - -004 0 - - - - - - - - - - - - - - - -

005 0 - - - - - - - - - - - - - - - -

006 0 - - - - - - - - - - - - - - - -

007 0 - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - -

010 0 - - - - - - - - - - - - - - - -

011 42 - - - - - - - - - - - - - - - -

012 42 - - - - - - - - - - - - - - - -

013 42 - - - - - - - - - - - - - - - -

014 42 - - - - - - - - - - - - - - - -

015 42 - - - - - - - - - - - - - - - -


30 ppm H2S

Bldg IDBldg



Bldg IDg

ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


PBID

30ppm

001 0 - - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - - -

003 0 - - - - - - - - - - - - - - - - -004 0 - - - - - - - - - - - - - - - - -

005 0 - - - - - - - - - - - - - - - - -

006 0 - - - - - - - - - - - - - - - - -

007 0 - - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - - -

010 0 - - - - - - - - - - - - - - - - -

011 17 - - - - - - - - - - - - - - - - -

012 17 - - - - - - - - - - - - - - - - -

013 17 - - - - - - - - - - - - - - - - -

014 17 - - - - - - - - - - - - - - - - -

015 17 - - - - - - - - - - - - - - - - -


100 ppm H 2S

Bldg IDBldgID 1 2 3 4

5 6 7 8 9 10 11 12 13 14 15 16 17



gID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


PB ID100ppm

001 0 - - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - - -

003 0 - - - - - - - - - - - - - - - - -

004 0 - - - - - - - - - - - - - - - - -

005 0 - - - - - - - - - - - - - - - - -

006 0 - - - - - - - - - - - - - - - - -

007 0 - - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - - -

010 0 - - - - - - - - - - - - - - - - -

011 5 - - - - - - - - - - - - - - - - -012 5 - - - - - - - - - - - - - - - - -

013 5 - - - - - - - - - - - - - - - - -

014 5 - - - - - - - - - - - - - - - - -

015 5 - - - - - - - - - - - - - - - - -

016 5


300 ppm H

2S



Bldg IDBldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Type Type B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4 B4

PBID

300ppm

001 0 - - - - - - - - - - - - - - - -

002 0 - - - - - - - - - - - - - - - -

003 0 - - - - - - - - - - - - - - - -

004 0 - - - - - - - - - - - - - - - -

005 0 - - - - - - - - - - - - - - - -

006 0 - - - - - - - - - - - - - - - -

007 0 - - - - - - - - - - - - - - - -

008 0 - - - - - - - - - - - - - - - -

009 0 - - - - - - - - - - - - - - - -

010 0 - - - - - - - - - - - - - - - -011 0 - - - - - - - - - - - - - - - -

012 0 - - - - - - - - - - - - - - - -

013 0 - - - - - - - - - - - - - - - -

014 0 - - - - - - - - - - - - - - - -

015 0



Bldg IDBldgID 1 2 3 4

5 6 7 8 9 10 11 12 13 14 15 16 17



Bldg IDID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


PBID

12.5

001 210 - - - - H - - H H H H H - - - - H

002 210 - - - - H - - - H H H H - - - - H

003 210 - - - - H - - - H H H H - - - - H004 41 - - - - - - - - - - - - - - - - -

005 41 - - - - - - - - - - - - - - - - -

006 41 - - - - - - - - - - - - - - - - -

007 170 - - - - H - - - H H H H - - - - -

008 170 - - - - H - - - H H H H - - - - -

009 170 - - - - H - - - H H H H - - - - -

010 88 - - - - H - - - H H H - - - - - -

011 247 - - - - H - - - H H H H - - - - H

012 247 - - - - H - - - H H H H - - - - H

013 247 - - - - H - - - H H H H - - - - H

014 247 - - - - H - - - H H H H - - - - -

015 247 - - - - H - - - H H H H - - - - -




CAM 70 mbar

Bldg



Bldg IDBldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


CAID

70mbar

01 20 - - - - - - - - - - - - - - - - -

CAM 100 mbar

Bldg IDBldgID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


CAID

100mbar

01 11 - - - - - - - - - - - - - - - - -

CAM 275 mbar

Bld


Nahada 1

0.25 LFL

Bldg



Bldg IDBldgID 1 2 3

Type Type B4 B4 B4

PBID

0.25LFL

001 1199 H H H

002 1199 H H H

003 1199 H H H

004 1199 H H H

005 1199 H H H

006 1199 H H H

0.5 LFL


Type Type B4 B4 B4

PBID

0.5LFL

001 979 H H H


30 ppm H2S

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4



Type Type B4 B4 B4

PBID

30ppm

001 20 - - -

002 20 - - -

003 20 - - -

004 20 - - -005 20 - - -

006 20 - - -

100 ppm H2S

Bldg IDBldgID 1 2 3

Type Type B4 B4 B4PBID

100ppm

001 7 - - -

002 7 - - -

003 7 - - -



Bldg IDBldgID 1 2 3

Type Type B4 B4 B4



Type Type B4 B4 B4

PBID

12.5

001 281 H H H

002 281 H H H

003 281 H H H

004 281 H H H005 281 H H H

006 281 H H H


Bldg ID 1 2 3

Type B4 B4 B4PBID

37.5

001 217 H H -

002 217 H H -

003 217 H H -


Nahada 2

0.25 LFL

Bldg



Bldg IDBldgID 1 2

Type Type B4 B4

PBID

0.25LFL

001 1199 H H

002 1199 H H

003 1199 H H

004 1199 H H

0.5 LFL

Bldg IDBldgID 1 2

Type Type B4 B4

PBID

0.5LFL

001 979 H H

002 979 H H

003 979 H H


100 ppm H2S

Bldg IDBldgID 1 2



Type Type B4 B4

PBID

100ppm

001 7 - -

002 7 - -

003 7 - -

004 7 - -

300 ppm H2S

Bldg IDBldgID 1 2

Type Type B4 B4

PBID 300ppm

001 0 - -

002 0 - -

003 0 - -

004 0 - -


004 225 H H

CAM 70 mbar

NA



NA

CAM 100 mbar

NA

CAM 275 mbar

NA


Natih

0.25 LFL

Bldg IDBldg



Bldg IDg

ID 1 2 3 4 5

Type Type B4 B3 B1 B4 B4

PBID

0.25LFL

001 60 - - - H -

002 60 - - - H -

003 60 - - - H -

004 80 H - - H -

005 80 H - - H -

006 60 - - - H -

007 204 H H H H H

008 204 H H H H H

009 204 H H H H H

010 204 H H H H H011 204 H H H H H

012 364 H H H H H

013 364 H H H H H

014 364 H H H H H


013 239 H H H H H

014 239 H H H H H

015 239 H H H H H

016 0 - - - - -

017 0



017 0 - - - - -

018 1039 H H H H H

019 1039 H H H H H

10 ppm H2S

Bldg ID BldgID 1 2 3 4 5


PBID

10ppm

001 0 - - - - -

002 0 - - - - -

003 0 - - - - -

004 8 - - - - -

005 8 - - - - -

006 0 - - - - -

007 0 - - - - -

008 0 - - - - -


007 0 - - - - -

008 0 - - - - -

009 0 - - - - -

010 0 - - - - -

011 0 - - - - -



011 0 - - - - -

012 0 - - - - -

013 0 - - - - -

014 0 - - - - -

015 0 - - - - -

016 0 - - - - -

017 0 - - - - -018 23 - - - - -

019 23 - - - - -

100 ppm H2S

Bldg IDBldgID 1 2 3 4 5


PBID

100ppm

001 0 - - - - -

002 0 - - - - -


PBID

300ppm

001 0 - - - - -

002 0 - - - - -

003 0 - - - - -



003 0

004 0 - - - - -

005 0 - - - - -

006 0 - - - - -

007 0 - - - - -

008 0 - - - - -

009 0 - - - - -010 0 - - - - -

011 0 - - - - -

012 0 - - - - -

013 0 - - - - -

014 0 - - - - -

015 0 - - - - -

016 0 - - - - -

017 0 - - - - -

018 0 - - - - -

019 0 - - - - -


018 253 H H H H H

019 253 H H H H H






PBID

37.5

001 35 - - - - -

002 35 - - - - -

003 35 - - - - -

004 50 - - - - -

005 50 - - - - -

006 35 - - - - -

007 103 H H H - H

008 103 H H H - H

009 103 H H H - H010 103 H H H - H

011 103 H H H - H

012 121 H H H - H

013 121 H H H - H


01 7.5 - - - - -

02 7.5 - - - - -

CAM 275 mbar





CAID

275mbar

01 0 - - - - -

02 0 - - - - -




AAppppeennddiixx II – – PPlloott ppllaannss


NAHADA 1

PPllaanntt NNoor r tthh



Report Number: 296-3241-R02Revision: 0

March 2008 of 175


NAHADA 2





March 2008 of 175


NATIH





March 2008 of 175


FAHUD NOCS





March 2008 of 175




FAHUD B





March 2008 of 175


`FAHUD C





March 2008 of 175


FAHUD D





March 2008 of 175


FAHUD E





March 2008 of 175


FAHUD F





March 2008 of 175

296-3241-r02 Pdo Fahud Stage II Bra Rev 0

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Transcript of 296-3241-r02 Pdo Fahud Stage II Bra Rev 0