Asme sec viii d1 c pt ult

PART ULTGeneral

ULT-1 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290ULT-2 Conditions of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290ULT-5 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290

DesignULT-16 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-17 Welded Joints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-18 Nozzles and Other Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-23 Maximum Allowable Stress Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-27 Thickness of Shells. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-28 Thickness of Shells Under External Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291ULT-29 Stiffening Rings for Shells Under External Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-30 Structural Attachments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-56 Postweld Heat Treatment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-57 Examination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

FabricationULT-75 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-79 Forming Shell Sections and Heads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-82 Welding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296ULT-86 Marking on Plate and Other Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Inspection and TestsULT-90 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299ULT-99 Pressure Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Marking and ReportsULT-115 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Pressure Relief DevicesULT-125 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

FigureULT-82 Weld Metal Delta Ferrite Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

288

COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services

TablesULT-23 Maximum Allowable Stress Values in Tension for 5%, 8%, and 9% Nickel

Steels, Type 304 Stainless Steel, and 5083-O Aluminum Alloy atCryogenic Temperatures for Welded and Nonwelded Construction. . . . . . . . . . . . . 292

ULT-82 Minimum Tensile Strength Requirements for Welding ProcedureQualification Tests on Tension Specimens Conforming to QW-462.1. . . . . . . . . . . 297

289


PART ULTALTERNATIVE RULES FOR PRESSURE VESSELS

CONSTRUCTED OF MATERIALS HAVING HIGHERALLOWABLE STRESSES AT LOW TEMPERATURE

GENERAL

ULT-1 SCOPE

The alternative rules in Part ULT are applicable topressure vessels or vessel parts that are constructed ofmaterials for which increased design stress values havebeen established for low temperature applications. Whenapplied, these rules shall be used in conjunction withthe requirements in Subsection A and Part UW ofSubsection B. The requirements of Subsection C donot apply except when referenced in Part ULT.

ULT-2 CONDITIONS OF SERVICE

(a) Measures shall be taken to avoid stresses at anytemperature that are in excess of the maximum allowablestress applicable to that temperature. For example, themembrane stress at the maximum allowable workingpressure at 100°F (38°C) shall never exceed the maxi-mum allowable stress for 100°F (38°C). See ULT-27.

(b) Vessel use shall be restricted to fluids specificallyconsidered for the design of the vessel. The physicalcharacteristics of the contained fluid shall be such thata maximum operating temperature can be determinedfor the liquid phase at the maximum allowable workingpressure of the vessel. The safety relief valve settingthus controls the maximum operating temperature ofthe vessel for the specific fluid.

(c) The allowable stress at 100°F (38°C) shall beused for the design of vessel parts that are exposedto the static head of cryogenic fluid but are not actuallycontacted by the fluid, such as, as in a dead-end cylinderconnected to the bottom of a vessel that contains agas cushion.

(d) Insulation shall be applied external to the pressurevessel.

290

ULT-5 GENERAL

(a) Materials covered by this Part subject to stressdue to pressure shall conform to one of the specificationsgiven in Section II and shall be limited to those listedin Table ULT-23. The allowable stress values of TableULT-23 are limited to those materials which will be incontact with the cold liquid when subject to liquid head.

(b) Materials not covered by Part ULT may be usedfor vessel parts, provided such materials shall conformto one of the specifications in Section II and shall belimited to those materials permitted by another Part ofSubsection C. The maximum allowable stress for suchparts shall be determined at 100°F (38°C). All applicablerequirements of that Part of Subsection C shall be metincluding any required impact tests.

(c) The 5%, 8%, and 9% nickel steels listed in TableULT-23 shall be tested for notch ductility as requiredby UHT-5(d) and (e) and UHT-6. These ductility testsshall be conducted at the lowest temperature at whichpressure will be applied to the vessel or the minimumallowable temperature to be marked on the vessel,whichever is lower.

(d) For 5083 aluminum the provisions and require-ments of UNF-65 for low temperature operation apply.

(e) For 5%, 8%, and 9% nickel steel vessels, allstructural attachments and stiffening rings which arewelded directly to pressure parts shall be made ofmaterials of specified minimum strength equal to orgreater than that of the material to which they areattached.

(f) The weldments of Type 304 stainless steel shallbe Charpy impact tested as required by UG-84(h),except that the exemptions fo UHA-51 do not apply.These impact tests shall be conducted at the lowesttemperature at which pressure will be applied to thevessel or the minimum allowable temperature to bemarked on the vessel, whichever is lower. The applicable


ULT-5 PART ULT — LOW TEMPERATURE VESSELS ULT-28

minimum lateral expansion opposite the notch for allspecimen sizes shall be as required in UHT-6(a)(3)and (a)(4). All requirements of UHT-6(a)(3) and (a)(4)shall apply.

(g) For Type 304 stainless steel vessels, all structuralattachments and stiffening rings that are welded directlyto pressure parts shall be made of the same materialas the pressure part to which they are attached.

DESIGN

ULT-16 GENERAL

(a) The rules in the following paragraphs applyspecifically to the design of pressure vessels and vesselparts that are constructed of materials listed in TableULT-23 and shall be used in conjunction with therequirements for Design in Subsection A and Part UWof Subsection B.

(1) The thermal stresses resulting from the differ-ences between the base metal and the weld metal shallbe considered in the design.

(2) For vessels made of 5%, 8%, and 9% nickelsteels, the minimum thickness after forming of a sectionsubject to pressure shall be3⁄16 in. (4.8 mm) and themaximum thickness of the base metal at welds shallbe 2 in. (51 mm).

ULT-17 WELDED JOINTS

(a) All Category A, B, C, and D joints (UW-3) shallbe full penetration welds.

(b) The alignment of longitudinal joints in adjacentcylindrical sections or heads shall be displaced at leastfive times the thickness of the thicker material.

(c) In vessels of 5%, 8%, or 9% nickel steels, allCategory D joints shall be in accordance with Fig. UHT-18.1 or UHT-18.2 when the nominal shell thickness atthe opening exceeds 1 in. (25 mm).

(1) All joints of Category D attaching a nozzleneck to the vessel wall, and to a reinforcing pad ifused, shall be full penetration groove weld conformingto Fig. UHT-18.1 or Fig. UHT-18.2 or any of thesketches in Fig. UW-16 having full penetration welds.

(2) All joints of Category A shall be Type No.(1) of Table UW-12.

(3) All joints of Category B shall be Type No.(1) or (2) of Table UW-12.

(4) All joints of Category C shall be full penetra-tion welds extending through the entire section atthe joint.

291

(5) Joint alignment requirements of UHT-20 shallbe met.

(d) Butt welds with one plate edge offset [Fig. UW-13.1 sketch (k)] are prohibited anywhere in the vessel.

ULT-18 NOZZLES AND OTHERCONNECTIONS

(a) Nozzles shall not be located in Category A orB joints. When adjacent to Category A or B joints,the nearest edge of the nozzle-to-shell weld shall beat least five times the nominal thickness of the shellfrom the nearest edge of the Category A or B joint.

(b) The attachment of pipe and nozzle necks tovessel walls shall be by welded construction only.

ULT-23 MAXIMUM ALLOWABLE STRESSVALUES

Table ULT-23 gives the maximum allowable stressvalues at the temperatures indicated for materials con-forming to the specifications listed therein. Valuesmay be interpolated for intermediate temperatures (seeUG-23).

ULT-27 THICKNESS OF SHELLS

The minimum thickness of any vessel part shall bethe greater of the following:

(a) the thickness based on the MAWP at the top ofthe vessel in its normal operating position plus anyother loadings per UG-22, including the static head ofthe most dense cryogenic liquid to be contained. Thepermissible stress value shall be determined for theapplicable material in Table ULT-23 at the operatingtemperature corresponding to the saturation temperatureat MAWP of the warmest cryogenic fluid contained.The maximum allowable compressive stress shall bedetermined in accordance with UG-23(b) at 100°F(38°C) and the requirements of UG-23(c) shall be met.

(b) the thickness determined by using the permissiblestress value at 100°F (38°C) based on the MAWP atthe top of the vessel in its normal operating positionplus any other loadings per UG-22, except that nostatic head need be included.

ULT-28 THICKNESS OF SHELLS UNDEREXTERNAL PRESSURE

(a) Cylindrical and spherical shells under externalpressure shall be designed by the rules in UG-28 using


Table ULT-23 2001 SECTION VIII — DIVISION 1

01

TA

BL

EU

LT

-23

MA

XIM

UM

AL

LO

WA

BL

ES

TR

ES

SV

AL

UE

SIN

TE

NS

ION

FO

R5%

,8%

,A

ND

9%N

ICK

EL

ST

EE

LS

,T

YP

E30

4S

TA

INL

ES

SS

TE

EL

,A

ND

5083

-OA

LU

MIN

UM

AL

LO

YA

TC

RY

OG

EN

ICT

EM

PE

RA

TU

RE

SF

OR

WE

LD

ED

AN

DN

ON

WE

LD

ED

CO

NS

TR

UC

TIO

N

5%N

icke

lS

teel

s,C

usto

mar

yU

nits

8%an

d9%

Nic

kel

Ste

els,

Cus

tom

ary

Uni

ts

Pla

tes:

SA

-645

2P

late

s:2

SA

-353

,S

A-5

53T

ype

I,an

dS

A-5

53T

ype

IIP

ipes

and

Tub

es:

SA

-333

Gra

de8

and

SA

-334

Gra

de8

For

ging

s:S

A-5

22W

elde

dC

onst

ruct

ion3,

4W

elde

dC

onst

ruct

ion3,

4

Tem

pera

ture

,1N

onw

elde

dT

empe

ratu

re,1

Non

wel

ded

°FC

onst

ruct

ion,

ksi

UT

S10

0ks

iU

TS

95ks

i°F

Con

stru

ctio

n,ks

iU

TS

100

ksi

UT

S95

ksi

−32

043

.138

.936

.9−

320

43.9

38.9

36.9

−30

039

.437

.936

.1−

300

42.6

37.9

36.1

−25

037

.036

.334

.6−

250

39.8

36.3

34.6

−20

036

.035

.033

.3−

200

37.3

35.0

33.3

−15

034

.533

.531

.8−

150

35.1

33.5

31.8

−10

032

.932

.130

.5−

100

33.2

32.1

30.5

−50

31.3

31.0

29.5

−50

31.6

31.0

29.5

027

.127

.127

.10

28.6

28.6

27.1

100

27.1

27.1

27.1

100

28.6

28.6

27.1

Typ

e30

4S

tain

less

Ste

el,

Cus

tom

ary

Uni

ts

Spe

cifi

edM

inim

umS

tren

gths

atR

oom

Tem

pera

ture

Max

imum

Allo

wab

leS

tres

s,ks

i,fo

rT

empe

ratu

res,

1°F

,N

otE

xcee

ding

Ten

sile

,Y

ield

,S

pec.

No.

Gra

deks

iks

i−

320

−30

0−

250

−20

0−

150

−10

0−

500

100

SA

-240

nonw

elde

d30

475

.030

.035

.535

.033

.431

.729

.727

.525

.320

.020

.0co

nstr

ucti

onS

A-2

40w

elde

d30

475

.030

.023

.623

.423

.122

.822

.422

.121

.820

.020

.0co

nstr

ucti

on

Tab

leco

ntin

ues

onfo

llow

ing

page

292


PART ULT — LOW TEMPERATURE VESSELS Table ULT-23

01

TA

BL

EU

LT

-23

MA

XIM

UM

AL

LO

WA

BL

ES

TR

ES

SV

AL

UE

SIN

TE

NS

ION

FO

R5%

,8%

,A

ND

9%N

ICK

EL

ST

EE

LS

,T

YP

E30

4S

TA

INL

ES

SS

TE

EL

,A

ND

5083

-OA

LU

MIN

UM

AL

LO

YA

TC

RY

OG

EN

ICT

EM

PE

RA

TU

RE

SF

OR

WE

LD

ED

AN

DN

ON

WE

LD

ED

CO

NS

TR

UC

TIO

N(C

ON

T’D

)

5083

-OA

lum

inum

Allo

y,C

usto

mar

yU

nits

Spe

cifi

edM

inim

umS

tren

gths

atR

oom

Tem

pera

ture

Max

imum

Allo

wab

leS

tres

s,ks

i,fo

rM

etal

Tem

pera

ture

,1°F

,N

otE

xcee

ding

Spe

c.T

ensi

le,

Yie

ld,

No.

Allo

yT

empe

rT

hick

ness

,in

.ks

iks

i−

320

−30

0−

250

−20

0−

150

−10

0−

500

100

She

etan

dP

late

SB

-209

5083

O0.

051–

1.50

040

1815

.615

.314

.513

.813

.112

.512

.111

.411

.41.

501–

3.00

039

1714

.714

.413

.713

.012

.411

.811

.511

.111

.13.

001–

5.00

038

1613

.913

.612

.912

.211

.611

.110

.810

.710

.75.

001–

7.00

037

1513

.012

.712

.111

.510

.910

.410

.110

.010

.07.

001–

8.00

036

1412

.111

.911

.310

.710

.29.

79.

49.

39.

3

Rod

s,B

ars,

and

Sha

pes

SB

-221

5083

OU

pth

ru5.

000

3916

13.9

13.6

12.9

12.2

11.6

11.1

10.8

10.7

10.7

Sea

mle

ssE

xtru

ded

Tub

e

SB

-241

5083

OU

pth

ru5.

000

3916

13.9

13.6

12.9

12.2

11.6

11.1

10.8

10.7

10.7

Tab

leco

ntin

ues

onfo

llow

ing

page

293



01

TA

BL

EU

LT

-23

MA

XIM

UM

AL

LO

WA

BL

ES

TR

ES

SV

AL

UE

SIN

TE

NS

ION

FO

R5%

,8%

,A

ND

9%N

ICK

EL

ST

EE

LS

,T

YP

E30

4S

TA

INL

ES

SS

TE

EL

,A

ND

5083

-OA

LU

MIN

UM

AL

LO

YA

TC

RY

OG

EN

ICT

EM

PE

RA

TU

RE

SF

OR

WE

LD

ED

AN

DN

ON

WE

LD

ED

CO

NS

TR

UC

TIO

N(C

ON

T’D

)

5%N

icke

lS

teel

s,S

IU

nits

8%an

d9%

Nic

kel

Ste

els,

SI

Uni

ts

Pla

tes:

SA

-645

2P

late

s:2

SA

-353

,S

A-5

53T

ype

I,an

dS

A-5

53T

ype

IIP

ipes

and

Tub

es:

SA

-333

Gra

de8

and

SA

-334

Gra

de8

For

ging

s:S

A-5

22W

elde

dC

onst

ruct

ion3,

4W

elde

dC

onst

ruct

ion3,

4

Non

wel

ded

Non

wel

ded

Tem

pera

ture

,1C

onst

ruct

ion,

UT

S68

9U

TS

655

Tem

pera

ture

,1C

onst

ruct

ion,

UT

S68

9U

TS

655

°CM

Pa

MP

aM

Pa

°CM

Pa

MP

aM

Pa

−19

626

023

422

3−

196

265

234

223

−18

423

822

921

8−

184

256

229

218

−15

622

321

920

9−

156

240

219

209

−12

921

721

120

1−

129

225

211

201

−10

120

820

219

2−

101

211

202

192

−73

199

194

184

−73

200

194

184

−46

189

187

178

−46

191

187

178

−18

163

163

163

−18

172

172

163

3816

316

316

338

172

172

163

Typ

e30

4S

tain

less

Ste

el,

SI

Uni

ts

Spe

cifi

edM

inim

umS

tren

gths

atR

oom

Tem

pera

ture

Max

imum

Allo

wab

leS

tres

s,M

Pa,

for

Tem

pera

ture

s,1

°C,

Not

Exc

eedi

ng

Spe

c.T

ensi

le,

Yie

ld,

No.

Gra

deM

Pa

MP

a−

196

−18

4−

156

−12

9−

101

−73

−46

−18

38

SA

-240

304

517

207

143

142

140

138

136

134

132

130

130

Tab

leco

ntin

ues

onfo

llow

ing

page

294



01

TA

BL

EU

LT

-23

MA

XIM

UM

AL

LO

WA

BL

ES

TR

ES

SV

AL

UE

SIN

TE

NS

ION

FO

R5%

,8%

,A

ND

9%N

ICK

EL

ST

EE

LS

,T

YP

E30

4S

TA

INL

ES

SS

TE

EL

,A

ND

5083

-OA

LU

MIN

UM

AL

LO

YA

TC

RY

OG

EN

ICT

EM

PE

RA

TU

RE

SF

OR

WE

LD

ED

AN

DN

ON

WE

LD

ED

CO

NS

TR

UC

TIO

N(C

ON

T’D

)

5083

-OA

lum

inum

Allo

y,S

IU

nits

Spe

cifi

edM

inim

umS

tren

gths

atR

oom

Tem

pera

ture

Max

imum

Allo

wab

leS

tres

s,M

Pa,

for

Met

alT

empe

ratu

re,1

°C,

Not

Exc

eedi

ng

Spe

c.T

ensi

le,

Yie

ld,

No.

Allo

yT

empe

rT

hick

ness

,m

mM

Pa

MP

a−

196

−18

4−

156

−12

9−

101

−73

−46

−18

38

She

etan

dP

late

SB

-209

5083

O1.

30–3

8.10

276

124

9291

8376

7270

6969

6938

.13–

76.2

026

911

787

8681

7470

6868

6767

76.2

3–12

7.00

262

110

8281

7972

6866

6666

6612

7.03

–177

.80

255

103

7776

7470

6665

6463

6317

7.83

–203

.20

248

9772

7169

6764

6362

6262

Rod

s,B

ars,

and

Sha

pes

SB

-221

5083

OU

pth

ru12

7.00

269

110

8281

7974

7068

6867

67

Sea

mle

ssE

xtru

ded

Tub

e

SB

-241

5083

OU

pth

ru12

7.00

269

110

8281

7974

7068

6867

67

NO

TE

S:

(1)

Str

ess

valu

esat

inte

rmed

iate

tem

pera

ture

sm

aybe

inte

rpol

ated

.(2

)M

inim

umth

ickn

ess

afte

rfo

rmin

gan

yse

ctio

nsu

bjec

tto

pres

sure

shal

lbe

3 ⁄ 16in

.(4

.8m

m),

and

max

imum

thic

knes

sof

the

base

met

alat

wel

dssh

all

be2

in.

(51

mm

).(3

)T

hem

inim

umte

nsile

stre

ngth

ofth

ere

duce

dte

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nsp

ecim

enin

acco

rdan

cew

ith

QW

-462

.1sh

all

not

bele

ssth

an10

0ks

i(6

89M

Pa)

or95

ksi

(655

MP

a),

resp

ecti

vely

,at

room

tem

pera

ture

.C

hoic

eof

UT

Sde

pend

son

wel

ding

proc

ess

and

fille

rm

etal

used

inth

eco

nstr

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on.

(4)

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ded

cons

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tion

allo

wab

lest

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esap

ply

only

tobu

ttjo

ints

.

295


ULT-28 2001 SECTION VIII — DIVISION 1 ULT-82

the applicable figures in Subpart 3 of Section II, PartD at 100°F (38°C).

(b) Examples illustrating the use of the charts in thefigures for the design of vessels under external pressureare given in Appendix L.

ULT-29 STIFFENING RINGS FOR SHELLSUNDER EXTERNAL PRESSURE

Rules covering the design of stiffening rings aregiven in UG-29. The design shall be based on theappropriate chart in Subpart 3 of Section II, Part Dfor the material used in the ring at 100°F (38°C).

ULT-30 STRUCTURAL ATTACHMENTS

(a) See ULT-5(g) for limitations on material usedin permanent structural attachments in 5%, 8%, or 9%nickel steel vessels. See ULT-5(g) for limitations onmaterial used in permanent structural attachments inType 304 stainless steel vessels.

(b) The structural details of supporting lugs, rings,saddles, straps, and other types of supports shall begiven special design consideration to minimize localstresses in attachment areas.

(c) Attachments to 5%, 8%, or 9% nickel steelvessels shall be made using a weld procedure qualifiedto Section IX.

(d) Attachments to Type 304 stainless steel vesselsshall be made using a weld procedure meeting ULT-82.

ULT-56 POSTWELD HEAT TREATMENT

(a) For 5%, 8%, or 9% nickel steels, the provisionsof UHT-56, UHT-80, and UHT-81 apply.

(b) For 5083 aluminum, the provisions of UNF-56apply.

(c) For Type 304 stainless steel vessels, the provi-sions of UHA-32 apply

ULT-57 EXAMINATION

(a) All butt joints shall be examined by 100% radiog-raphy, except as permitted in UW-11(a)(7).

(b) All attachment welds, and all welded joints sub-ject to pressure not examined by radiography or ultra-sonic testing, shall be given a liquid penetrant examina-tion either before or after hydrotest. Relevant indicationsare those which result from imperfections. Any relevant

296

linear indication greater than1⁄16 in. (1.6 mm) shall berepaired or removed.

When a pneumatic test is required by ULT-99(b),these liquid penetrant examinations shall be performedprior to pneumatic test.

(c) For 5083 aluminum, the requirements of UNF-91 apply.

FABRICATION

ULT-75 GENERAL

The rules in the following paragraphs apply spe-cifically to the fabrication of pressure vessels and vesselparts that are constructed to this Part and shall be usedin conjunction with the requirements for fabrication inSubsection A and Part UW of Subsection B.

ULT-79 FORMING SHELL SECTIONS ANDHEADS

The requirements and limitations of UNF-77 applyfor 5083 aluminum, and of UHT-79 for 5%, 8%, or9% nickel steel.

ULT-82 WELDING

(a) A separate welding procedure qualification shallbe made, as prescribed in Section IX, Part QW, exceptthat the procedure qualification tests on tension speci-mens conforming to QW-462.1 and prescribed in QW-451 shall be four in number, two of which when testedat room temperature shall meet the minimum tensilestrength requirements for room temperature as listedin Table ULT-82 and two of which when tested at orbelow the vessel minimum allowable temperature shallmeet the minimum tensile strength requirements forthat test temperature as listed in the applicable table,except that the requirements for the two tests at vesselminimum allowable temperature shall not be appliedto procedure qualification for 5083 aluminum weldedwith 5183 aluminum filler metal.

(b) For 5%, 8%, or 9% nickel steels, the provisionsof UHT-82, UHT-83, UHT-84, and UHT-85 apply.

(c) For Type 304 stainless steel vessels, the followingprovisions apply.

(1) The welding processes that may be used arelimited to gas metal arc, gas tungsten arc, and sub-merged arc.

(2) Filler metal is limited to SFA-5.9, AWS Classi-fications ER308L and ER308L(Si). The filler metal



TA

BL

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LT

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MIN

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ksi

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ksi

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in.

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300

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100

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612

913

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heet

and

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300

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133

126

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512

112

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s,B

ars,

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ts

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79.7

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Tab

leco

ntin

ues

onfo

llow

ing

page

297



TA

BL

EU

LT

-82

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IMU

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EN

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)

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h,M

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for

Met

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p.,1

UT

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c.°C

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aM

Pa

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mm

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6−

184

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285

279

276

276

276

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371

359

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294

279

272

270

269

269

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825

625

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877

273

817

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343

331

299

272

257

251

249

248

248

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710

745

710

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655

655

689

655

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ars,

and

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565

568

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371

358

324

294

279

272

270

269

269

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e

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0037

135

832

429

427

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227

026

926

9

Typ

e30

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tain

less

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el,

SI

Uni

ts

Min

imum

Ten

sile

Str

engt

h,M

Pa,

for

Met

alT

empe

ratu

re,1

°C,

Not

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eedi

ng

Spe

c.N

o.−

196

−18

4−

156

−12

9−

101

−73

−46

−18

38

SA

-240

570

566

558

550

541

534

525

517

517

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:(1

)S

tren

gth

valu

esat

inte

rmed

iate

tem

pera

ture

sm

aybe

inte

rpol

ated

.

298


01


shall conform to the SFA specified percentage composi-tion limits.

(3) A determination of delta ferrite of each lot offiller metal shall be made by the use of the chemicalanalysis from (c)(2) above, in conjunction with Fig.ULT-82. Additionally, for submerged arc welds, adetermination of delta ferrite shall be made in conjunc-tion with Fig. ULT-82, by the use of the chemicalanalysis of lots of electrode and flux used for productionwelds. The acceptable delta ferrite shall not be lessthan 6 FN nor greater than 14 FN.

ULT-86 MARKING ON PLATE ANDOTHER MATERIALS

For 5%, 8%, or 9% nickel steel the requirements ofUHT-86 apply. For the use of other markings in lieuof stamping, see UG-77(b).

INSPECTION AND TESTS

ULT-90 GENERAL

The provisions for inspection and testing in Subsec-tions A and B shall apply to vessels and vessel partsconstructed of materials covered by this Part, exceptas modified herein.

ULT-99 PRESSURE TEST

The vessel shall be hydrostatically pressure tested atambient temperature in the operating position for aminimum of 15 min, using the following requirementsof (a) or (b), whichever is applicable.

(a) Except for vessels covered by (b) below, a hydro-static test shall be performed in accordance with UG-99, except that the ratio of stresses is not applied, andthe test pressure shall be at least 1.4 times the designpressure at 100°F (38°C).

(b) When the test procedure in (a) above will causea nominal membrane stress greater than 95% of specifiedminimum yield strength or 50% of specified minimumtensile strength of the material in any part of the vessel,the hydrostatic test may be conducted at a pressurethat limits the nominal membrane stress at such partto the lesser of those values. When these conditionslimit the hydrostatic test pressure to a value less than110% of the maximum allowable working pressure at100°F (38°C), a pneumatic test in accordance withUG-100 shall also be conducted, except that the ratioof stresses is not applied.

299

(c) Vessels which are to be installed in the verticalposition may be tested in the horizontal position pro-vided all components of the vessel are hydrostaticallytested for a minimum of 15 min at a pressure not lessthan 1.4 times the design pressure at 100°F (38°C)plus the equivalent of the head of the test liquid inthe operating position.

MARKING AND REPORTS

ULT-115 GENERAL

The provisions for marking and reports in UG-115through UG-120 shall apply to vessels constructed tothis Part, with the following supplements to the markingand Manufacturer’s Data Reports:

(a) The vessel markings shall be in accordance withUG-116 except:

(1) the letters ULT shall be applied below the USymbol;

(2) the following markings shall be used insteadof those in UG-116(a)(3) and UG-116(b)(1)(a):

Maximum Allowable Working Pressure: psi at 100°FMinimum Allowable Temperature: Minus °F

Service Restricted to Operatingthe Following Temperature

Liquid Minus °FLiquid Minus °FLiquid Minus °FLiquid Minus °F

NOTES APPLICABLE TO MARKINGS:(1) Minimum allowable temperature is the temperature of the

coldest cryogenic liquid which will be admitted to or stored withinthe vessel.

(2) Operating temperature for the cryogenic liquid is its saturationtemperature at MAWP. All liquids that may be contained in thevessel shall be listed.

(b) On the Manufacturer’s Data Report, under Re-marks, show the additional marking notations from (a)above.

(c) Unless the requirements of (c)(1) and (2) beloware met, for 5%, 8%, and 9% nickel steels, the useof nameplates is mandatory for shell thicknesses below1⁄2 in. (13 mm); nameplates are preferred in all thick-nesses.

(1) The materials shall be limited to aluminum asfollows: SB-209 Alloys 3003, 5083, 5454, and 6061;SB-241 Alloys 3003, 5083, 5086, 5454, 6061, and6063; and SB-247 Alloys 3003, 5083, and 6061.

(2) The minimum nominal plate thickness shallbe 0.249 in. (6.32 mm), or the minimum nominal pipethickness shall be 0.133 in. (3.38 mm).


Fig. ULT-82 2001 SECTION VIII — DIVISION 1

FIG

.U

LT

-82

WE

LD

ME

TA

LD

EL

TA

FE

RR

ITE

CO

NT

EN

T

300


Paul Goodman


PRESSURE RELIEF DEVICES

ULT-125 GENERAL

The provisions of UG-125 through UG-136 shallapply to vessels constructed to this Part; the vesselshall be equipped with a safety relief valve suitablefor low temperature service and installed to remain atambient temperature except when relieving.

301


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Asme sec viii d1 c pt ult