LNG Tanks Paper by Dilip Patel

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Dili Dili

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May 2000

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Page Page 10(1 10(1

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CONTENTS

API 620 Design Issues Storag Capacity

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Page 20f1

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Introduction

re

.E

re

is

ground tanks.

an

de below. Th

facility. Above Ground Details

Tank Type

Single Containment

Applicable Code

Design Pressure mbarg

BS 77

Ful Containment

140

318

Steel

Comments

mbar tank have ee buil

BS 7777

Double Containment

Membrane Containment

ks

Prop ieta design fo membrane with

290

290 Technigaz, KHI, c.

Notes:

PC

AP 62 Appendix

LNG_ Tanks_Paper_by_Oilip_Patef

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API 620

620 is

Si

Requiremen Detail Allowabl design stress 9% Ni stee

PI Lesser of 1/ 2/ rd of MY

Allowabl stress during hydr test fo 9% stee Hydrotest loa

Lesser of 55 of TS or 85 ofMS 1.25 time maximu produc loa Yes

Weld meta stress as limiting factor in design Plate Material Desig stress Tes stress

ASTM A553 Type 23

BS 77

ro

Lesser of UTS/2.3 or 0.2%PS/1. no over 26 Ntmm 85 ofMY Full heighthydr test

wi

N/mm2

15011 pt2

26 Ntmm

34 Ntmm

_R

operating membrane tensile stress level location Above O.1xUTS-100%.

re

100 radiography of all but welds

100%

sign Issu Storag

Capacity

export an reserv

capacity studies.

LNG_ Tanks_Paper_by_Dilip_Pate/

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Tank Pressu

building tank

it

higher design pressure

Safety Issues General

Year of Tank Failure 1944 1973

1977 1978

Product Cleveland, Ohio Staten-Island,

LNG LNG

ause of Ta Failure

Material

Zi failur Accident Probably foam insulation Zi failur

Das-lsland

nt du to inadequate design

1984

LNG_ Tanks_Paper_by_Dillp_Patel

followin leak

pipeline

650 approx.

spheres

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2.3x10· accidental

tatistic

an variou

10~ ri ks invo ve

operation.

re

ro PS ru iqui penetran or ultrasonic examinatio

Earthquake

methods.

Resistance

LNG_ Tanks_Paper_by_Difip_Patef

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earthquake intens ties

se smic isolat rs

Subsidence

rt

Se

BS tank bo to

temperatur

an

sett ement.

Wind

rm atmospheri

pressure.

LNG Tanks_Paper_by _Dilip_Patel

Page 70f1

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Impa

BS

Generally

Fire

for

fo exampl tank

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savings.

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Pr ssur

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analysis.

45

Overfilling

design consideration.

Rollover

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circulatio

of tank contents

Leaks

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10

Spillage

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Hydrotes Requirements

ry

No

ec

De tructive Test ng NOT) Requ emen PI

hazard

an

necessar

saving

fo required no

precaution

associated with radiographic exam nation th techniqu

destruct ve examinat ons.

11

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Loca Regulatory Requirements

.re

Conclusion

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purpos

an comp ie

to th

LNG Tanks_Paper_by _Dilip_Patel

re ulator

requirements

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REFERENCES:

Installations. ic

it

10 11

1997.

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