PIPIG

C

ING FLGUIDEL

CENTRAL

MIDYA

M

LEXIBILLINES R

& WESTE

AN GAS P

MIDYAN G

LAR

LITY ANREPOR

ERN REG

PLANT PR

B

GAS PRO

P

RSEN TO

Date:

NALYSRT FOR

GIONS PR

ROJECTS

BI-10-031

OCESSING

repared

OUBRO A

: April 02

SIS ANDR DYNA

ROJECT D

DIVISION

57

G FACILIT

by

ARABIA

2, 2015

D SUPPAMIC L

DEPARTM

N (MGPPD

TIES

A LLC

PORTINLOADS

MENT/

D)

NG S

INDEX Sr. No. Description Page 1. Introduction 1

2. Applicable Codes & Standards 1

3 Flexibility Analysis Requirement 1

4. Seismic Load Calculation 1

5. Two Phases (Slug) Load Calculation 2

6. Supporting guidelines for non-critical Lines 2

7. Flexibility Analysis of Critical Lines 4

8. Piping load input: 4

9. Pipe Support Arrangement on structure for Dynamic Loads. 5

10. Flexibility in pipes Under Seismic Event 8

11. Conclusion 11

1

1. Introduction: The document presents the guidelines and procedures for flexibility analysis of flexibility critical and non-critical lines and supporting arrangement for piping system subjected to

dynamic loads (Seismic and Two Phases Flow Lines) for Midyan Gas Processing Facilities, Saudi

Aramco.

2. Applicable Codes & Standards:

SAES-L-120: Piping Flexibility Analysis

SAES-L-310: Design of Plant Piping

SABP-L-010: Guideline of Evaluating of Pipe Movement

SABP-L-006: Piping Stress Analysis Review

ASME B31.3: Process Piping

3. Flexibility Analysis Requirement: As per SAES-L-120, the piping systems are categorized in three categories for carrying out pipe flexibility Analysis.

a. Detail Analysis.

b. Formal Analysis

c. Formal Review

The lines under category details Analysis are analyzed for static load as well as dynamic loads

(Seismic and Slug Forces) using computer software CAESAR II.

The lines under category of Formal Analysis are analyzed for static loads using computer software

CAESAR II

4. Seismic Load Calculation: The Seismic loads are calculated using response spectrum method as per data is given SAES-A-112 and guidelines per ASCE 7-05.

Following parameters are considered for calculating seismic load.

Short Period Acceleration (SS) in %g = 40

One Sec Period Acceleration (S1) in %g = 13

Site Class = D

Importance factor = 1.5 for Occupancy Category IV

Site Coefficient Fa = 1.48

Site Coefficient Fv = 2.38

5. Twoper d

F

F

W

The pipe

6. Supp

The

to ta

guid

T T

g

T T

s

Tn

i

o Phases (Slu

data from Pro

FAxial =

FOrthogonal =

Where:

= LA =

V = V

e flexibility a

porting guid

lines under t

ake care wei

delines are as

The horizont

The vertical

gravity load.

The lines are

The lines ru

structure by p

The lines hav

natural frequ

is below 4 H

ug) Load Ca

ocess Discipl

AV2(1-CAV2Sin

Liquid Fluid

Internal Pipe

Velocity of S

analysis is per

delines for n

third categor

ight, therma

below:

tal lines are s

lines are sup

e guided in lin

unning at hig

providing cla

ving two pha

uency of pipin

z as per stand

alculation: In

line.

Cos) n

density

e C/S Area

Slug

rformed usin

on-critical L

ry (Formal R

al expansion

support first i

pported at on

ne with guid

gh level are

amp or vertic

ases flow is p

ng system h

dard enginee

2

n two phase f

ng response s

Lines:

Review) are w

as well as

in line with b

ne place abov

e space chart

also support

cal stop.

properly supp

higher than e

ering practice

flow lines th

spectrum met

well supporte

rigidity of t

basic span ch

ve to center

t.

ted for verti

ported with ax

xpected freq

e to avoid any

e slug loads

thod for slug

ed with guide

the piping sy

hart to avoid s

of gravity o

cal restraint

xial stops an

quency of slu

y kind of fail

are calculate

g loading.

e/axial stop a

ystem. The

sagging in pi

f Vertical Ru

to avoid fal

d guides to k

ug bundle in p

lure due to re

ed as below

and clamps

supporting

ipe.

uns against

ll off from

keep lowest

pipe which

esonance.

Ts

CAL

Pipe Size S

Inch 2 3 S4 S6 S8 S

10 S12 S14 S16 S18 S20 S24 S

The

f = (

The

calcu

f = (

Whe

E (Y

The lowest n

supported at

LCULATIO

SCH OD

mm80 60.3

STD 88.9STD 114.3STD 168.3STD 219.1STD 273.1STD 323.9STD 355.6STD 406.4STD 457.0STD 508.0STD 610.0

natural frequ

1/2)(/L)2(Enatural frequ

ulation.

1/2)(22.37/ere:

Young Modul

natural frequ

both ends wi

ON OF LOW

D THK

m mm 0 5.54 3

90 5.49 130 6.02 330 7.11 110 8.18 310 9.27 690 9.53 160 9.53 140 9.53 200 9.53 300 9.53 400 9.53 8

uency for the

EI/W)

uency for th

/L2)(EI/W)

lus of Carbon

uencies of lin

ith 6 m span

WEST NAT

Area Moment

of Inertia

I

mm4 3.61E+051.26E+063.01E+061.17E+073.02E+076.69E+071.16E+081.55E+082.34E+08 23.35E+08 24.64E+088.10E+08 4

e simply-supp

he fixed-fixed

n Steel) = 0.2

3

nes are tabu

on the pipe r

TURAL FRRACK

Weight per length

WL W

Kg/m K9.38 716.06 1124.29 1646.91 2874.83 42

111.21 60146.87 73170.29 81211.11 93255.80 10304.91 11415.39 14

ported case is

d case is

2 N/mm2

ulated for the

rack as below

REQUENCK

unit SupSP

WV LL

Kg/m m 7.48 6 1.29 6 6.08 6 8.26 6 2.55 6 0.31 6 3.88 6 1.33 6 3.27 6

05.17 6 7.15 6

41.12 6

s

Have backup

e simply-sup

w.

Y PIPE SU

pport PAN

SSu

LV fL

m Hz6 3.836 5.466 6.876 9.756 12.36 15.16 17.36 18.66 20.56 22.36 24.06 27.2

p data to pro

pported and f

UPPORTED

Simply-upported

fV

z Hz 3 4.29 6 6.51 7 8.44 5 12.56

39 16.44 14 20.56 37 24.49 63 26.96 55 30.91 35 34.85 06 38.82 26 46.76

ove authentic

fixed-fixed

D ON PIPE

Fixed-FixeSupported

fL fVHz H

8.67 9.712.37 14.15.57 19.22.10 28.28.09 37.34.31 46.39.37 55.42.23 61.46.57 70.50.65 78.54.54 87.61.78 105

city of this

E

ed d

V

Hz 71 75 14 48 25 59 51 10 06 99 99 .99

4

(Density of Carbon Steel) = 0.0785 Kg/mm3 From the above table, it is clear that the lines two inch and above on pipe rack shall have

minimum lowest frequency near to 4 Hz.

Note: The above said calculation is only for demonstration not being used for calculating for the

checking the frequency in project.

7. Flexibility Analysis of Critical Lines: Standard Engineering Guidelines for analysis of flexibility critical piping system as per SAES-L-120

and ASME B31.3.

The piping systems under detail analysis and formal analysis criteria are analyzed for static load as well as for occasional loads using of Computer software CAESAR II.

The piping systems are analyzed first for static load (sustained load, thermal load at operating, maximum design and minimum design conditions including wind load if applicable).

After fulfilling the requirement of code and standard guidelines for static loads, the piping system is analyzed for occasional loads by using response spectrum method in dynamic analysis for only

under detail analysis category.

The code stresses are checked for within the limit of dynamic code allowable stresses. The displacement and load on structure for dynamic load in piping system is also check to avoid

interference with other nearby pipe and load input for civil discipline.

For two phase flow having slug flow, the modal analysis is performed to keep the lowest natural frequency of the piping system 6Hz which is much higher than natural frequency of structure to

avoid resonance with flow in the piping system as well as structure by proving guide and Axial

Stop.

After modal analysis, the piping system is checked for slug load to verify the stresses, displacement and slug load on structure using response spectrum method under occasional load.

An axial stop is provided in a straight run as a minimum and load due to slug force is passed to civil to take care in the design of structure.

8. Piping load input: The static loads are given to civil discipline to design the structure for Sustained load, operating

load and Test Load.

For two phase flow lines, higher of static and dynamic loads are given to civil discipline and Structure has been designed accordingly.

Wind and Seismic loads are to be considered by civil. All two phase lines are line stopped at braced bay.

9. Pipe9.1 R

9.2 R

9.3 V

e Support Ar

Rest with G

Rest with Ax

Vertical Res

rrangement

uide Suppor

xial Stop for

straint Supp

on structur

rt for Insula

r Insulated P

port for insu

5

re for Occasi

ated Pipes

Pipes

lated Pipe

ional Loads..

9.4 G

9.5 A

9.6 V

Guide Supp

Axial Stop f

Vertical Res

ort for Bare

for Bare Pipe

straint for B

e Pipe

e

Bare Pipe

6

9.7 C

9.8 R

9.9 G

Clamp Supp

Rest Suppor

Guide Supp

port for Gui

rt for Vertic

ort for Vert

de and verti

cal Lines

tical Lines

7

ical stop for Small Bore Pipe.

10. Flex

Duri

pipe

and g

10.1

T

s

xibility in pip

ing seismic e

s are routed

guidelines ar

SupportinThe pipe run

shown in figu

pes Under S

event the str

and supporte

re as below.

ng of pipe on

ns on pipe ra

ure

eismic Even

ructures may

ed in such a

n Pipe Rack

ack is suppo

8

nt.

y drift in diff

way that pip

orted with sin

ferent directi

pes shall hav

ngle limit st

ion and to a

ve natural fle

top and guid

ccommodate

exibility. Few

des at other c

e the same,

w examples

columns as

T A

i

A A

d

10.2

T

m

The pipes are

At exit point

is not provid

At other colu

A limit stop

direction dur

SupportinThe pipe run

may not fall

e routed at m

t/entering po

ed to allow th

umns, guide i

is provided f

ring seismic e

ng of pipe on

ns on tee sup

off from the

minimum 1 m

int of pipe fr

he movemen

is provided th

for static load

event.

n Tee Suppor

pport is supp

tee support a

9

m level differe

rom Pipe Ra

nt of pipe in d

he pipe to sta

d and the sam

rt

ported with e

as shown in f

ence at enteri

ack the guide

different dire

ay with pipe

me is used to

either guide o

figures.

ing and exit l

e until require

ection during

rack during s

o stop the mo

or U-bolt or

level from pi

ed under stat

seismic even

seismic even

ovement of pi

on tee supp

ipe rack.

tic analysis

nt.

nt.

ipe in axial

ort so pipe

10.3

T

s

10.4

Pipe SuppThe pipe is s

seismic even

Pipe SuppThe pipe on

port near equ

supported at

nt as shown in

port on Colu

column/Tan

uipment on

distance fro

n figure.

umn/Tank

nk is proper g

10

grad and fo

m the equipm

guided with to

r Vertical P

ment to prov

o stay with c

ipe

vide the suffi

column/Tank

ficient flexibi

during seism

ility during

mic event.

10.5

T

s

11. ConAram

syste

oper

Pipe SuppThe pipe run

sleeper to av

nclusion: Th

mco and Int

em has been

ration conditi

ported on sle

ns on sleeper

oid any kind

he practices

ternational C

analyzed an

ion by consid

eepers

r is supporte

d of failure un

followed by

Codes & Sta

nd done supp

dering inter d

11

ed with singl

nder seismic

y engineerin

andards along

porting arran

dependent be

le limit stop

event.

ng team are

g with best

ngement for s

havior of pip

in straight r

complying

engineering

static load an

ping and struc

run and guid

with applica

g practices. T

nd dynamic

cture.

des on each

able Saudi

The piping

load under