Jacket Weighing Procedure

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SATELLITE FIELD DEVELOPMENT PROJECT

(PHASE I)

ITUT AND ABANG JACKET WEIGHING PROCEDURE

NGTA-NK-NPZZZ-00-XXXXXXX Rev. A ii

MOBIL

PRODUCING

NIGERIA

Prepared, Reviewed, Endorsed and App roved by:

Person Descrip tion Signature Date

Gordon DunthorneNIGERDOCK Engineer

Manager

Preparedby

Melchor YaunNIGERDOCK Lead Engineer

Checkedby

Jagba Smart

NIGERDOCK QA/QCEngineer

Endorsed

by

Edward YorkNIGERDOCK Project

Manager

Approvedby

MPN Representative Approved

by


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NGTA-NK-NPZZZ-00-XXXXXXX Rev. A iii

MOBIL

PRODUCING

NIGERIA

REVISION MODIFICATION LOG

Revision Section ACTION Descrip tion

Rev. A ALL Initial Document Issued for Review/Comments


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NGTA-NK-NPZZZ-00-XXXXXXX Rev. A iv

MOBIL

PRODUCING

NIGERIA

TABLE OF CONTENTS

1.0 SCOPE OF WORK 1

2.0 INTRODUCTION 1

3.0 CONCLUSION 2

4.0 SAFETY 3

5.0 EQUIPMENT 5

6.0 ORGANIZATIONAL CHART 6

7.0 PERSONNEL 7

8.0 COMMUNICATION 8

9.0 METHOD 8

10.0 ANALYSIS 10

11.0 DATA ANALYSIS 13

12.0 REFERENCES 13

APPENDIX A

APPENDIX B


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ITUT AND ABANG JACKET WEIGHINGPROCEDURE

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1.0 SCOPE OF WORKThis procedure describes the method that will be utilized for the weighing ofSFDP Jackets pertaining to ND’s Scope of work for Mobil Producing Nigeria.

This procedure is based on SFDP Jackets, SFDP Jacket Weight is 258.2 Mt(as of estimate 27-01-).

2.0 INTRODUCTION

This document describes the weighing of ITUT Jacket Structural Analysis of the

Jacking point currently being fabricated at Nigerdock Nigeria FZE, located atSnake Island Apapa Lagos.

The method of weighing will be firstly place sheets of 30mm thick steel plateunder the jacket grillage points, then insert jacking stool frames in positiondirectly under the centre of each platform support leg and to place the enerpacload cells immediately on top of this jacking stool support frame (shimmed tosuit) This will enable 4 enerpac load cells wires to be run and utilized along withthe enerpac control panel ensuring accurate recording of the weighing exercise.

Drawing ND-ITT-710-GA-200-A1 Below clearly shows enerpac locations and

wiring connected to the main control panel

The structural analysis on the jacking stool was carried out using Staad Pro2004, the design and checking is in accordance with AISC ASD 9 th Edition and

API RP2A All Dimensions used in this procedure are based on SI units andweight calculation in Mtons.

3.0 CONCLUSION:

The analysis performed on the jacking stool satisfies the structural integrity towithstand the stresses and that the deflection is within the allowable limits

Maximum stress ratios for weighing are listed below:

- 0.608 for load cell C3- 0.649 for all other load cells


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4.0 SAFETY

• Before the Weighing operations commence, risk assessments followed by Job

safety analysis (JSA) will be completed for all work undertaken by ND’s personnel,

and any subcontractor employed in the work. The approved JSA will be discussed

among the workforce prior to commencing any Jacking activity.

• The Gantry side where the intended structure for Weighing will be temporarily

positioned must be cordoned off from unauthorized persons and visitors. Barrier

control will be strictly enforced. No personnel will be allowed in the vicinity of

suspended loads.• Only authorized persons shall partake in the JSA meeting

• ND shall ensure all procedures are understood and workers are briefed as to any

potential worksite hazards. All identified hazards or potential hazards shall be

promptly eliminated or controlled.

• ND shall ensure all works related to the Weighing are carried out in a safe and

efficient manner and that safe systems of work are prepared and implemented.

• ND shall ensure all equipment are safe, suitable for the operation, kept in good

condition and that defects are identified and follow up action initiated to repair

defective equipment or withdraw it from site.

• All Weighing Equipment shall be inspected prior to use and will have an up to date

certification.

• A pre-weighing checklist shall be used to verify safe systems of work are in place,

the check list shall be endorsed by MPN Heavy Lift Advisor.

• ND shall ensure all places of work, including work at heights, etc are safe and

where necessary adequate control measures shall be implemented through JSA,

Risk Assessment or Toolbox talks.

• Risk assessment will be carried out by ND and Company and will be developed by

the Risk Charter Group as per required procedures.

• JSA will be developed based on the RA findings.


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• An emergency response plan will be developed by the Safety Group.

All personnel involved in this operation shall:

Avoid harm to themselves and prevent harm to others

Utilize and maintain all issued protective equipment in the correct

manner.

Be aware of, and comply with all relevant project HSE procedures.

Make appropriate suggestions for the improvement of safety within the

operations.

ND shall ensure all personnel involved in the Weighing campaign are PPE

compliance at all times (Coveralls, steel toe shoes, Hard hat, Safety Glasses)

as minimum requirements..

5.0 EQUIPMENT:

This section describes the minimum equipment needed to perform thisoperation. All Equipment to be used in this procedure shall be checked andcertified by a recognized certifying authority. Equipments required for theWeighing operation are not limited to the following list:

ENERPAC

4 off ENERPAC 500t LOAD CELLS complete with central control panel

JACKING STOOL As fabricated by Nigerdock


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6.0 ORGANIZATIONAL CHART (FOR WEIGHING OPERATION)

7.0 PERSONNEL AND RESPOSIBILITIES

7.1.1 CONSTRUCTION SUPPORT MANAGER (1) – He is in charge of theOver all Operation during weighing. All personnel involved in thisoperation will report to him. He gives the instructions to any Load CellOperators, and Assistance Personnel. He is also responsible to have allcertification to hand over to Company for review prior to weighing.

7.1.2 MPN – Rigging Superintendent (1) – He is responsible for checking thatthe overall approved methodology has been followed before, during andafter the weighing.

7.1.4 SAFETY PERSONNEL – Responsible for all works related to theWeighing are carried out in a safe and efficient manner and that safesystems of work are prepared and implemented. During Operation onesingle Safety Officer will be inside the Barricaded area forcommunication with Safety Personnel on the outside of the barrier.

Construction Support

Mgr James Cunningham

Safety Officer – In cha

Mr. Kayode Omojag ba

Watch Over Assistant

Odom Anefiok

Enerpac Load Cell operator Stand-by Team

plusMaintenance

Group:Scaffolders

Welders

ElectricianHelpers

Fitters

Forklift

MPN – Rigging Supt.

Mr. Allistair Thompson


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7.1.5 STANDBY TEAM – A support team for any immediate fabricationrequired or assistance in related matters. It comprises of the following:

The number of personnel will be determined by Construction SupportManager.ScaffoldersWeldersElectricianHelpersFittersForklift Operators

Load Cell Maintenance Personnel (1) – Part of the support team to assiston any mechanical fault on cranes during operation.

8.0 COMMUNICATION

A communication exercise between the involving personnel will be establishedprior to Weighing Operation. A minimum of two (2) days is expected for thisexercise before the final Weighing operation and one (1) day prior to Pre-Weighmeeting.

During the operation the Hand Signaling, Verbal and Radio will be the means ofcommunication. Spare radio equipment will be made available.

All the Instructions will come from the Construction Support Manager; he givesthe instructions and receives the information from his subordinates. Thiscoordination will come from Load Cell Operators and Safety In charge.

The communication between the involved personnel will be by means of oneradio channel in order to ensure clear communication.

The Load Cell Operators and any assistant will communicate to theConstruction Support Manager whenever the event or situation of the Load Cellis in dangerous position. The instruction will be three STOPS, ex. “STOP!STOP!! STOP!!!”.

The four (4) Load Cells used in the operation will be named and identified asfollows:

Load Cell C1Load Cell C2Load Cell C3Load Cell C4


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Name tags will be placed on each load cell for identification.

A co-ordination exercise will be undertaken 3 days prior to the operation withLoad Cell operators if the Construction Support Manager feels they are notexperienced enough.

9.0 METHOD

9.1 PREPARATION:

All Rigging and Weighing Appliances should have all certifications checkedprior to use.

Remove all obstructions that will hinder the operations. During operation the area shall be limited to nominated yard personnel only. All other personnel shall observe operation from outside the taped area.

Load Cells shall be positioned as specified in the drawings. Any Required Rigging equipment shall be positioned in accordance to the

specified drawings. All radio communication shall be checked if working properly. The Over all control of the operation shall be Construction Support Manager

who will be in touch with the personnel as defined by Communicationsections of the procedures.

During Weighing Operation, all client communicate shall be addressed

through Project Manager or his deputy. A pre-weighing meeting shall be held between ND Team and Company todiscuss the procedure and issues concerned. All procedure shall be clear toboth parties and pass JSA (Job Safety Analyses) prepared by theConstruction Support Manager with support from the Safety Department.

9.2 A pre weighing meeting shall be held to ensure that everyone involvedunderstand the procedure. This will also ensure that the coordinationbetween load cell operator, Construction Support Manager and safetypersonnel is achieved.

9.3 During weighing a 50% load shall be tested on each load cell asspecified on the above theoretical value of each load point, and measurementshall be taken and recorded. All loads in the load cells will be measured. Whenthe 50% load is achieved, the structure will be lifted gradually until a full 100%load is achieved at a height of 100mm from the support and this operation is tobe repeated a minimum of 3 times and readings recorded for each liftoperation.


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9.4 Acceptance criteria of the final recorded value of the 3 weighing

operations shall be the average of the 3 recorded values and this value shouldnot differ from the maximum of any of the 3 values by more than 0.7%. Thetolerance of the enerpac load cell should be equal to or less than 1%.

9.5 The maximum load on any one load cell shall between 20-80% of theirtotal load capacity.

9.6 If the weighing is achieved and satisfies the operation, the structure willbe put back in original position otherwise the weighing operation will berepeated again.

10.0 ANALYSIS:

This section explains the procedure performed for the analysis of the ITUT jacking stool.

The data for the model was taken from the weight control and CofG reportproduced by Nigerdock and analysis was performed on Staad-pro

See attachements in Appendix A

11.0 DATA ANALYSIS

The following members are included in this analysis are:LOAD LISTSELF WEIGHTC.O.G.LOAD CELL REACTIONSCODE CHECK AISC LFRD

12.0 REFERENCES:

Nigerdock Shop Drawings Reference:

1. ND-ITT-710-GA-200-A12. ND-ITT-710-GA-201-A1

The reports of the analysis are based on the following specifications:


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1. AISC 9th Edition2. API 2A (RP2A)

APPENDIX A

SFDP-TOPSIDE WEIGHING-BEAM-1SFDP-TOPSIDE WEIGHING-BEAM-2

APPENDIX B

CURRENT JACKET WEIGHT CONTROL SUMMARY


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Jacket Weighing Procedure

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