50450799 Piping Stress Analysis Bechtel

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PIPING

STRESS

ANALYSIS

DESIGN

MANUAL GROUP INC.

STRESS BECHTEL

I 1//79.._REV. aE~

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~mON

J W}S

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DA=Coff.

~R REVISION

BY

OES. GUIDE NO. PLANT DESIGN AND PIPING

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30G -P45-OOZ@

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TABLE

OF CONTENTS

1.2.

GENERAL DRAWING INITIAL STRESS REVIEW DISTRIBUTION PIPING RELIEVED STUDIES VESSELS PIPING AND PIPING AND PROCEDURES

3.4.

5.

OF CRITICAL Pumps Compressors Turbines Ai rfans Heaters Buried Cryogenic Piping

5.15.2

5.3 5.4 5.5 5.6 5.7 6.

& Low Temperature OF APPROACH Pipe Pipe Spans Overhang

Piping PROBLEMS

STANDARDIZATION 6.1 6.2 Allowable Allowable Pipe Guide

TO PIPING

6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.

Spacing Strong Back Flexibility

Instrument In-Line Expansion Pipe

Pumps Loop Design

Anchors Exchangers Pipeways AND SPECIAL PROBLEMS

Stacked Off Plot

MISCELLANEOUS 7.01 7.02 Slug Mitered Tee

Flow Elbows

7.03 7.04 7.C5 7.c6

Connections Connections Coil Decoking

Injection Heater Catalyst

Regeneration

Page

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51

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TABLE

OF CONTENTS

(CONTD.)

7.07 7.08 7.09 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.19 7.20 7.21 7.22 .7.23

Reformer Cold Spr

Furnace ng Systems

Pigtail

Design

Blowdown Field Soot

Checkout Blowers and Frost Heave Effect on Bare Piping

Settlement Ambient Control Hydrotest Pipe Tank Steam Plastic

Temperature Valve of Piping Large

Low Pressure

Piping

Supports Field Trace Piping and Steam Trap Piping

Piping and Stresses Vessels at

Rotations, Reactions Nozzle Connections Bowing of Pipe Bottle

to

Compressor

Support Due to Pressure

Tank Nozzle Movements and Temperature STRESS ANALYSIS

8.

PIPING

WORK CHECK LIST

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51

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1.

GENERAL This Design Guide following approved their Although closely, ment In must work it be on is an is intended procedures assigned to aid stress and techniques personnel in to complete

project. that and times. mdels in is or drawings, aesthetic of the dethe from the sound standards engineering be followed judge-

reco~nded thought at all

individual used piping

reviewing

isometrics,

Stress Analyst should keep sign of the piping systems piping design a stress and above should or lost a improper in mind schedules. All shall under piping systems reviewed groups support only be

mind that the the responsibility

and therefore he standpoint only. made when a saving revisions

should review them Exceptions to the situation ridiculously is involved, and their keeping affect on

large econamic time in making

by

the

Piping

Stress

Analysis

Group

be considered Section 301

latest ~, most computer analyses of thermal expansion,

for all the Design Conditions as listed of the Code for Pressure Piping ANSI 631.3, As a general rule or other applicable codes. of piping restraints should include and effects of only the support, effects anchor

Effects of dead and terminal movements. Other effects system are generally small. special calculations only when engineering to be possibly severe.

load on a well supported are to be studied by judgement deems them

I i

D.G.

C-5

Page

3 of51

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2.

DRAWING The

DISTRIBUTION normal

& PROCEDURES procedures to may be adjusted for particular and

following

projects or requirements 2.1 The assigned Vessel Job ings which

office locations of those projects

suit the special and locations.

conditions

Stress Analyst shall Supervisor and indicate should be distributed

confer with the Pressure his preference of drawto him. These drawings paving and grading, line designation

should generally be underground piping, tables, piping drawings

plot plans, P&lDs, pipeway stanchions,

basic data, flow diagrams, piping drawings and isometrics. When vessel drawings and structural are included, the filing of drawings becomes a major problem. In fact, much filing would be avoided if P&lDs and paving grading drawings were not included. This judgment is left to each individual. 2.2 The routing Group and efficiency of paper further distribution a) After Design of piping the stress isometrics group has between the Plant Design been standardized to increase and to reduce the amount isos in for iso be referred to as adopted procedure

of all handling. discussions. on

groups

concerned

Isometrics will The presently model led jobs is: are are drawn ready up to

isometrics Group and

and checked within the issue for construction, list date

Plant a

print of each together with sent to the Stress Analyst issued for construction. b) The Stress Analyst Standard C-701) on then all

a transmittal one week before

shall be to be

places a design data stamp (See isos except those which can be

approved for stress by inspection without specific design data. The stamped isos should then be filled in with the necessary design data from piping specifications and line design tables. An efficient and acceptable method of recording the expansion temperatures is to ~reDare a list of as maximum expi shown in the temperatures Line Designation for each Table particular i.e.: water)----------ing water)--------40# service

1A (instr. UA N (util. (nitrogen)

air)------100oF air)-------lOOF ---------lOOF water)--lOOF water)---lOOF

RW (raw

100oF l2OoF sat stm II temp. It

Cw (cooLS MS HS(1OW

press.steam) press. press.

DW (drinking PW (potable

(reed (high

steam)-150# steam)-60()#

Page

4 of

51

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@But process lines require from the line tables. a Likewise, are repeated Alloy ease c) list can be often that their individual temperature assignmentI

prepared are of schedules

for carbon

pipe specifications steel and the be specially

same

which schedule. for

spec.s and of identification.

should

listed

IiI

The isos are then as much as possible, calculation. All up with This where Plant meet support

reviewed leaving

at

the a

models few to

and

passed by

by

judgment marked iso.

only

verfiy

computer

isos passed by inspection should be designations during the review of each most efficient be immediately delivery to operation released the

II

in general will be the a group of isos must a Design Group schedule. for prompt

except by the to

fabricator

After all reviewed, supports, details, the iso

the isos listed those which can or which can be are indicated on itself with the

on a particular transmittal be field-supported, or require supported by whollv , standard the transmi~tal and the blue FTS, orig the nal pipe

have been no support print of

I [1

designations

respectively. isos accordingly support groups.

The Plant Design without need of

Group can stamp the their passing through retained proper

\

Technicians. purpose of required isos to on be

will be assigning every issued iso. for

by The Plan Design Group for the designations to the-lSTD supports bxpedite on the the ~paration Rev. O issue. of

This should construction

All other isos being approved

are checked off on the original transmittal as for stress with an engineered support designation

~except where a flexibility change or calculation is needed. IiHold For !jtressli will be tagged on the The symbol HFS indicating transmittal~posite the iso involved. Two copies of the transmittal with the above notations should then be given to the Plant Qesign Supervisor. d) All isos initialed alternate. should be Analyst assign e) IAetI as on they are approved by the the tracing by the Stress isos require by the Plant his study priority as of to Stress Analyst, Analyst or his the until should be designated

1

Where detained

a calculation, Design Group them. The finalizing by notified

tracing the Stress should

finalizes the highest isols are

Stress these

Analyst

isos. the release. Plant

verified

satisfactory

Design Group should if isos require a the required ?Iant Design change Group.

And be imediatel:~ revision, the print shouId be marked up with and a copv ~f the print should be given to the After the iso revisions have been made, a

calculation, for its

n.G.Page

c-5

5 of 51

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new

print

should

be

again

issued the

to

the Stress

Stress Analyst

Analyst will

for initial

final

review. If the tracing f) All prints

the iso is as approved. marked up by

correct

the

Stress

Analyst

with

the

support

requireisos

ment symbol are stamped support