Project Description: RC3RC1 PLATFORM

Owner: VIETSOVPETRO JOINT VENTURE

Client: SS-TECH ENGINEERING SDN BHD DOCUMENT NO.: RC3RC1-WCP - CAL - OO Page 1 of 6 DOCUMENT DESCRIPTION:

WCP­001 

DESIGN CALCULATION 

REVISION STATUS DATE DESCRIPTION VERIFIED BY PROJECT

MANAGER

0 12 APR 10 AS BUILT RT MT

Revision Status: P A,B,C,… 0,1,2,3…

Preliminary for information / bid For Client Comments & Approval Approved & Valid for Construction

SEMiTECHSEMITECH OFFSHORE ENGRG & SUPPLY PTE. LTD.6, Penjuru Place, #01‐24 Penjuru Tech Hub Singapore 608 781 Tel: (65) 9767 3409  Fax: (65) 6261 4400 

RC3RC1 PLATFORM

DOCUMENT TITLE:

WCP-001 DESIGN CALCULATION

Page 2 of 6

DOCUMENT NO.: RC3RC1-WCP - CAL - 00 REVISION

NO.: 0

SEMiTECH

TABLE OF CONTENTS 

1. RESERVOIR SIZING CALCULATION  2. CALCULATION FOR WELL CLOSETIME  3. CALCULATION FOR AIR SUPPLY REGULATOR  4. DESIGN CALCULATION FOR PUMP SIZING  5. GAS CONSUMPTION CALCULATION 

RC3RC1 PLATFORM

DOCUMENT TITLE:

WCP-001 DESIGN CALCULATION

Page 3 of 6

DOCUMENT NO.: RC3RC1-WCP - CAL - 00 REVISION

NO.: 0

SEMiTECH

1. RESERVOIR SIZING CALCULATION Volumes of Wellhead Valves

SCSSV = 2.2 L x Quantity of 6 = 13.2L

MSSV = 3.4 L x Quantity of 6 = 20.4L WSSV = 3.4 L x Quantity of 6 = 20.4L

TOTAL = 54.0L

1.1 All hydraulic field lines are to be pre-filled. This will require 19 gallons (U.S.) to

fill the 2000m of 3/8" 0.065 and 1000m of 1/4" x 0.049 tubing.

1.2 The return header (100m of 1" x 0.035 wall) tubing will hold 11 gallons (U.S.) of fluid. This will fill the second time surface valves are shut-in.

Both A & B above are one time usages of fluid and are given for calculation of required fluid at start-up.

1.3 Reservoir Sizing

Required volume from "A" above = 54.0

20% Spare Capacity = 10.8

Total = 64.8

To operate at 25% & 75% of capacity required x 2

= 130L Conclusion: as requested, 320 L reservoir is provided instead

2. CALCULATION FOR WELL CLOSETIME  

2.1. SCSSV Close Time   The calculation is basing in accordance with the following data :

- The tube size 1/4'' OD x 0.049” WT from SCSSV to WCP

RC3RC1 PLATFORM

DOCUMENT TITLE:

WCP-001 DESIGN CALCULATION

Page 4 of 6

DOCUMENT NO.: RC3RC1-WCP - CAL - 00 REVISION

NO.: 0

SEMiTECH

- The tube length is 200m from SCSSV to WCP - The SCSSV fully close at hydraulic pressure is 13.8 Bar - SG of hydraulic oil 0.87

Qw = Q2 x 0.87^0.5 = 16 x 0.87^0.5 = 1.99 GPM = 0.094 L

SCSSV close time = 2.2/0.094 = 23.4 sec Safety factor is 2 Result: SCSSV close time 47 sec

 2.2. MSSV/WSSV  Close time 

The calculation is basing in accordance with the following data : - The tube size 1” OD x 0.065” WT from MSSV to WCP - The tube length is 100m , from MSSV to WCP - The MSSV fully close at hydraulic pressure is 6.9 Bar - SG of hydraulic oil 0.87

Qw = Q2 x 0.87^0.5 = 23 GPM = 1.45 L

MSSV close time = 3.4/1.45 = 2.4 sec Safety factor is 2 Result: MSSV close time 5 sec

3.  CALCULATION FOR AIR SUPPLY REGULATOR 

SCFM(Q) = 16(CV) √ □P(P1+P2) T1SG

= 16 x 1.1 √ 4 x (74.7+70.7) (460+140) x 1 = 17.33 scfm

RC3RC1 PLATFORM

DOCUMENT TITLE:

WCP-001 DESIGN CALCULATION

Page 5 of 6

DOCUMENT NO.: RC3RC1-WCP - CAL - 00 REVISION

NO.: 0

SEMiTECH

SCFM(Q) Flow in standard cubic feet per minutes Cv Flow co-efficient for pressure regulator P1 Absolute inlet pressure (Bar) = 4.14 + 1 = 5.14 P2 Absolute outlet pressure (Bar) = 3.86 + 1 = 4.86 SG Specific gravity relative to air = 1 T1 Absolute inlet temperature degrees rankines = 460 + 140 = 600 �P Pressure drop in pound per square inch (Bar) = 0.275

4.  DESIGN CALCULATION FOR PUMP SIZING   

4.1. SSV PUMP 

The hydraulic Pump sizing for SSV is based on the following technical Data: • To open one SSV Valve within 5 Minutes • The Volume require to open one SSV is 3.4 liter • The Pump Discharge Pressure is 140 Bar • Instrument Air Supply Pressure is 7 Bar

The M37-01-HL pump will deliver 1.05 LPM with an air drive pressure of 7 bar and pump discharge pressure 140 Bar

Please refer to M37-01-HL pump performance chart. The opening Time 3.4 liters/ 1.05 =< 4 Minutes Conclusion: pump M37-01-HL is sufficient to open SSV valve within specified 5 minutes

 4.2. SCSSV PUMP 

The hydraulic Pump sizing for SCSSV is based on the following technical Data: • To open one SCSSV Valve within 5 Minutes • The Volume require to open of One SCSSV is 2.2 litre (including the volume of

tubing line of actual volume SCSSV will not exceed 0.3L and 1.9L tubing volume.

RC3RC1 PLATFORM

DOCUMENT TITLE:

WCP-001 DESIGN CALCULATION

Page 6 of 6

DOCUMENT NO.: RC3RC1-WCP - CAL - 00 REVISION

NO.: 0

SEMiTECH

Tubing Line will be filled only once (during initial period and it will not be required to fill again of this volume of 1.9L)

• The Pump Discharge Pressure is 490 Bar • Instrument Air Supply Pressure is 7 Bar The proposed M111-01-HL pump will deliver 0.32 LPM with an air drive pressure of 7 barg and pump discharge pressure 490 Bar. Please refer to M111-01-HL pump performance chart. The opening Time 0.3 litre/ 0.32= <1 minute Conclusion: pump M111-01-HL is sufficient to open SCSSV valve within specified 5 minutes

5.  GAS CONSUMPTION CALCULATION 

The design values for gas consumption shall be calculated using the following method. The peak-load requirement of each unit or group of units modified by a usage or working factor. The continuous demand will be the sum of all the adjusted peak-load requirements.

 STANDARD VOLUME PER SECOND

Unit Peak load (l/s) 

Usage factor 

Continuous demand (l/s) 

Tubing 1 0.7 0.7 Pressure gauges 0.4 0.2 0.08 Pneumatic indicators, pressure switches 0.5 0.2 0.1

Air driven hydraulic pumps (10 scfm x 1) + (30 scfm x 1) 20 1 20

Pilot/solenoid/manual relay/flow control needle valve/ level switches 2 0.4 0.8

Pressure regulators 0.7 1 0.7 Total 22.38 l/s

Total continuous demand (air) = =

1342.8 l/m 47.4 scfm