144-111-PI-CAL-002W_R1

Project No : 040176

PIPING FLEXIBILITY ANALYSIS

Client : Petro Canada

Project : De Ruyter Production Platform

Location : P11-b

Document number: 144-111-PI-CAL-002W Rev. no : R1 Page : 1 of 10


PIPING SYSTEM

SK-002W(Wellhead 2)

PREPARED FOR

By:Iv-Oil & Gas b.v

Rev. Description Date By Checked Appr’d by

R1 For Comments / Approval 14-07-2005 S. Hall R. Tjin M. van Neck

Project No : 040176




Location : P11-b


TABLE OF CONTENTS Page

1. INTRODUCTION............................................................................................................................................ 31.1 SCOPE OF WORK.............................................................................................................................. 31.2 APPLICABLE CODES......................................................................................................................... 31.3 REFERENCE DOCUMENTS..............................................................................................................3

2. SYSTEM DESIGN.......................................................................................................................................... 42.1 LINE DATA........................................................................................................................................... 42.2 CII CALCULATIONS............................................................................................................................ 42.3 DESIGN LOAD CASES........................................................................................................................ 52.4 ALLOWABLE STRESSES...................................................................................................................62.5 BLAST CALCULATIONS..................................................................................................................... 62.6 PIPE SUPPORTS................................................................................................................................ 72.7 FLANGE CONNECTIONS...................................................................................................................7

3. STRESS ANALYSIS...................................................................................................................................... 83.1 COMPUTER MODEL........................................................................................................................... 8

4. ANALYSIS RESULTS................................................................................................................................... 94.1 STRESSES.......................................................................................................................................... 94.2 FLANGES.......................................................................................................................................... 10

APPENDICES

APPENDIX 1 STRESS SKETCHES

APPENDIX 2 PIPE SUPPORT DETAILED DRAWINGS

APPENDIX 3 CONSTRUCTION ISOMETRICS

APPENDIX 4 MISCELLANEOUS CALCULATIONS

APPENDIX 5 CAESAR II PRINTOUT

Project No : 040176




Location : P11-b


1. INTRODUCTION

1.1 SCOPE OF WORK

The purpose of this report is to demonstrate that piping system SK-002W, part of De Ruyter topside piping, has inherent flexibility to accommodate displacements due to design conditions, without imposing any excessive loads on pipe supports and equipment nozzles. Furthermore the piping stress level has to satisfy the designated code.

1.2 APPLICABLE CODES

The governing code for piping design is:

ASME B31.3 Process Piping

For items not covered by the above-mentioned document, reference is made to the following codes and standards:

ASME VIII Rules for Construction of Pressure Vessels, Division 1 and 2

ASME III Rules for Construction of Nuclear Facility Components, Division 1

ASME B16.5 Pipe Flanges and Flanged Fittings

WRC-107 Local Stresses in Spherical and Cylindrical Shells due to External Loadings

API-6AF Technical Report on Capabilities of API Flanges under Combinations of Load

1.3 REFERENCE DOCUMENTS

144-002-PI-SPE-0002 Piping Classes Specifications

144-002-PI-SPE-0007 Plant Department Pipe Stress Design Criteria

144-111-PI-LST-0001 Plant Department Critical Line List

144-000-PR-LST-0001 Process Line List

144-000-ME-SPE-0004 Nozzle Loads on Equipment

144-002-HE-TNS-0007 Blast Design Strategy and Overpressures

Project No : 040176




Location : P11-b

Document number: 144-111-PI-CAL-002W Rev. no : R1 Page : 4 of 10 2. SYSTEM DESIGN

2.1 LINE DATA

Functional design data, used for analysis, is summarised below:

Item/ Line No.

Pipe

Cla

ss

Cor

rosi

on A

llow

ance

Des

ign

Pres

sure

Hyd

rote

st P

ress

ure

Max

imum

Ope

ratin

g Te

mpe

ratu

re

Max

imum

Des

ign

Tem

pera

ture

Min

imum

Des

ign

Tem

pera

ture

Med

ium

Den

sity

Flan

ge R

atin

g

Drawing Number

- mm barg barg °C °C °C Kg/m3 # -

6”-HC-100-008-F49-V F49 3 165 248 60 75 -11 1025 5000&1500

100008-1201

6”-HC-100-004-E41-D E41 3 165 248 60 75 -11 1025 1500100004-1201

100004-1202

Note: Installation temperature is assumed to be -11ºC throughout.

2.2 CII CALCULATIONS

The following CII calculations have been performed:

SK-002W-R1 : Design conditions

SK-002W-R1_BLAST : Blast loads

Project No : 040176




Location : P11-b


2.3 DESIGN LOAD CASES

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Location : P11-b


The Functional Loads, used to generate the design load cases, comprise the following (ambient temperature set at -11ºC):

(W) Gravity load, due to self-weight of steel, contents and insulation.

(P1) Pressure load, due to design pressure.

(T1) Thermal load due to maximum design temperature of 75ºC (all piping)

(D1) Displacement due to thermal growth of wellhead.

(D2..D5) Xmas tree horizontal displacement due to gap at top conductor guide, in four directions 90º (+X), 45º (+X+Z), 0º (+Z), 315º (+Z-X).

(F1..9) Slugging loads

(WIN1..4) Wind loads based on 42m/s velocity at 10m (100 year - 3 sec’s gust). Loads are applied in +X for Case 1, -X for Case2, +Z for Case 3 and –Z for Case 4

2.4 ALLOWABLE STRESSES

The allowable stresses are in compliance with the criteria specified in ASME B31.3

Material Max temp [ºC ]

Material Properties [N/ mm²]

Allowable stresses [N/mm²]

SMTS SMYS Sh Sa (EXP) Socc (OCC)

A333 Gr. 6 75 414 241138 207 183

Sustained Stress range Occasional

Note : Stress range is based on a stress reduction factor (f) of 1.

2.5 BLAST CALCULATIONSThe blast critical piping has been identified as per doc. no 144-002-HE-TNS-0007, Table C1.

Wellhead piping around the Xmas tree, only above deck at EL.30000 on the wellhead platform was identified as blast critical by the Safety group.

Blast Load: 12 KN/m2

Shape factor: 0.9 (conservative approach resulting in approximately 20% safety margin).

The blast loads are generated using CII wind modeler. The loads are applied in four (4) directions as described in section 2.3, above.A shape factor of 0.9 has been used (conservative approach).

Only the section of flowline from the wellhead to the deck atEL.30000 has been designed to withstand blast loads.

Project No : 040176




Location : P11-b


2.6 PIPE SUPPORTS

All loads on supports are summarised in the Pipe Stress Analysis Output.

The loads include friction forces. In this case a friction coefficient of 0.4 is taken into account for friction between steel surfaces. Where PTFE-sliding pads have been installled, a friction coefficient of 0.1 has been used. Available pipe support detail drawings are included in Appendix 2.

2.7 FLANGE CONNECTIONS

Flange connections are modelled in CAESAR II by anchoring together the rigid elements through a CNODE. This enables an easy check of the external loads using CII restraint output summary.

For B16.5 flange analysis, either of the following two methods has been used:

1. External loads acting on these connections are assessed using the ASME BPVC, Section VIII, Division 1, Appendix 2 in combination with Section III, subsection NC. Actual hub length is used.

2. External loads acting on these connections are assessed using the ASME BPVC, Section III, Division 1, subsection NC-3658.3, ASME B16.5 Flanged Joints with High Strength Bolting, with yield stress at temperature, SY, substituted with B31.3 allowable stress, Sh.

Flange analysis is performed for maximum acting loads and calculations are performed for each flange size in the calculation.

Project No : 040176




Location : P11-b


3. STRESS ANALYSIS

3.1 COMPUTER MODELFinite element computer models are developed based on the stress isometric included in Appendix 1.

Pipe stress program CAESAR II version 4.50, developed and marketed by COADE Engineering Software has been used for the analysis of the piping systems. This software package is a widely accepted tool to perform comprehensive stress analysis of complex piping systems.

The global co-ordinate system used in the computer model is indicated on the stress isometrics. Small differences in dimensions between the piping isometrics and the calculations may occur, but have no significant effect on the analysis.

The pipe routing of this system is shown below:

Blast limit of

critical piping

Project No : 040176




Location : P11-b


4. ANALYSIS RESULTS

4.1 STRESSES

The maximum calculated code stresses are summarized below and compared against B31.3 code allowable values. For blast case the calculation method set in document no. 144-002-PI-SPE-0007 was used. The calculated 3D stress intensities are compared with yield at operating temperature (230 N/mm2) multiplied by the shape factor, 4/.

All stresses are found to be within the allowable limits.

Table 4.1.1 Maximum Sustained Stress (SK-002W-R1)

Case No. Node MaterialCode Stress

N/mm²

Allowable Stress

N/mm²

Ratio

8 24 A333 Gr. 6 49 138 0.36

Table 4.1.2 Maximum Stress Range (SK-002W-R1)


N/mm²

Allowable Stress

N/mm²

Ratio

33 24 A333 Gr. 6 158 (note 1) 296 (note 2) 0.54

Table 4.1.3 Maximum Occasional Stress – Wind effects (SK-002W-R1)


N/mm²

Allowable Stress

N/mm²

Ratio

21 24 A333 Gr. 6 54 183 0.30

Table 4.1.4 3D Stresses – Blast effects (SK-002W-R1_BLAST)

Case No. Node Material3D Stress

N/mm²

Allowable Stress

N/mm²

Ratio

7 24 A333 Gr. 6 126 293 0.43

Notes

1. Maximum displacement stress range considers thermal effects, including wellhead thermal growth, with the addition of twice the displacement in all 4 (of 8) directions which represent the 10mm gap at the top conductor guide. Refer Section 2.3 for directions used.

2. Liberal allowable used.

Project No : 040176




Location : P11-b


4.2 FLANGES

The integrity of the ASME B16.5 flanges, under the maximum external loads, has been checked as outlined in section 2.7. The external loads are found to be acceptable. Detailed flange calculations and the summary have been included in Appendix 4 where required.

There are no nozzle loads in this calculation for the wellhead. Combined external bending moments at the wellhead master valve, which is size 5⅛” API 5000#, are compared with the API-6AF values in Appendix 4.

API flange loads are within the allowable values for the design and blast cases.

Project no : 040176


Project title : De Ruyter Production Platform

Location : P11-b


Document number : 144-111-PI-CAL-002W Rev. no : R1

APPENDIX 1

STRESS SKETCHES

Project no : 040176



Location : P11-b



APPENDIX 2

PIPE SUPPORT DETAILED DRAWINGS

Hold for support drawings of the following node numbers:85; 110; 130; 132; 160

Project no : 040176



Location : P11-b



APPENDIX 3

CONSTRUCTION ISOMETRICS

Hold for drawing numbers:

100008-1201100004-1201100004-1202

Project no : 040176



Location : P11-b



APPENDIX 4

MISCELLANEOUS CALCULATIONS

Project no : 040176



Location : P11-b



APPENDIX 5

CAESAR II PRINTOUT

Documents

144-111-PI-CAL-002W_R1