Ships and marine technology -- Gate valves for use in low temperature applications -- Design and testing requirements

This document specifies requirements of design, manufacture, and test methods for cryogenic gate valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to −196 °C).

Navires et technologie maritime -- Robinets vannes destinés aux applications à basse température -- Exigences de conception et d'essai

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Status
Published
Publication Date
06-Jun-2019
Current Stage
6060 - International Standard published
Start Date
26-Mar-2019
Completion Date
07-Jun-2019
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ISO 19037:2019 - Ships and marine technology -- Gate valves for use in low temperature applications -- Design and testing requirements
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INTERNATIONAL ISO
STANDARD 19037
First edition
2019-06
Ships and marine technology — Gate
valves for use in low temperature
applications — Design and testing
requirements
Navires et technologie maritime — Robinets vannes destinés aux
applications à basse température — Exigences de conception et d'essai
Reference number
ISO 19037:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 19037:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO 19037:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Pressure-temperature rating .................................................................................................................................................................. 3

4.1 Types of fluids .......................................................................................................................................................................................... 3

4.2 Working pressure and design temperature ................................................................................................................... 3

5 Design .............................................................................................................................................................................................................................. 4

5.1 General structure of a gate valve ............................................................................................................................................. 4

5.2 Materials general ......... .......................................................................................................................................................................... 4

5.3 Types and materials of body ....................................................................................................................................................... 4

5.3.1 Types .......................................................................................................................................................................................... 4

5.3.2 Manufacturing .................................................................................................................................................................... 4

5.4 Design and materials of extended bonnet ....................................................................................................................... 5

5.4.1 Design ........................................................................................................................................................................................ 5

5.4.2 Materials ................................................................................................................................................................................. 6

5.5 Design types and materials of wedge .................................................................................................................................. 6

5.5.1 Design ........................................................................................................................................................................................ 6

5.5.2 Materials ................................................................................................................................................................................. 6

5.6 Types and materials of stem ....................................................................................................................................................... 7

5.6.1 Design ........................................................................................................................................................................................ 7

5.6.2 Materials ................................................................................................................................................................................. 7

5.7 Stem sealing ............................................................................................................................................................................................... 7

5.8 Types and materials of a seat ring ......................................................................................................................................... 7

5.8.1 Design ........................................................................................................................................................................................ 7

5.8.2 Materials ................................................................................................................................................................................. 7

5.9 Types and materials of bolts and nuts ................................................................................................................................ 7

5.9.1 Design ........................................................................................................................................................................................ 7

5.9.2 Materials ................................................................................................................................................................................. 8

5.10 Requirements of driving system and operating devices ..................................................................................... 8

5.11 Surface treatment ................................................................................................................................................................................. 8

6 Welding heat treatment ................................................................................................................................................................................ 8

6.1 Welding .......................................................................................................................................................................................................... 8

6.2 Heat treatment ........................................................................................................................................................................................ 9

7 Test and inspection ............................................................................................................................................................................................ 9

7.1 Material test ............................................................................................................................................................................................... 9

7.2 Non-destructive inspection .......................................................................................................................................................... 9

7.2.1 Radiographic testing (RT) ........................................................................................................................................ 9

7.2.2 Penetrant testing (PT) ..............................................................................................................................................10

7.2.3 Ultrasonic testing (UT) ............................................................................................................................................10

7.2.4 Retest ......................................................................................................................................................................................10

7.3 Dimension check ................................................................................................................................................................................10

7.4 Visual inspection ................................................................................................................................................................................10

7.5 Heat treatment inspection .........................................................................................................................................................10

7.6 Operating tests .....................................................................................................................................................................................11

7.7 Pressure tests, back seat tests and leak tests ............................................................................................................11

7.7.1 Pressure tests...................................................................................................................................................................11

7.7.2 Back seat tests .................................................................................................................................................................11

7.7.3 High-pressure pneumatic shell test ..............................................................................................................12

7.8 Fire safety test ......................................................................................................................................................................................12

7.9 Cryogenic tests .....................................................................................................................................................................................12

7.9.1 Scope of tests ....................................................................................................................................................................12

© ISO 2019 – All rights reserved iii
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ISO 19037:2019(E)

7.9.2 Test procedure ................................................................................................................................................................12

7.9.3 Submission of test result ........................................................................................................................................14

8 Marking .......................................................................................................................................................................................................................14

Annex A (informative) Cryogenic gate valve — Example ..............................................................................................................15

Bibliography .............................................................................................................................................................................................................................16

iv © ISO 2019 – All rights reserved
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ISO 19037:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 3, Piping and machinery.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 19037:2019(E)
Ships and marine technology — Gate valves for use in
low temperature applications — Design and testing
requirements
1 Scope

This document specifies requirements of design, manufacture, and test methods for cryogenic gate

valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to

−196 °C).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5208, Industrial valves — Pressure testing of metallic valves
ISO 5209, General purpose industrial valves — Marking

ISO 28921-1, Industrial valves — Isolating valves for low-temperature applications — Part 1: Design,

manufacturing and production testing
API 598:2016, Valve Inspection and Testing
API 600:2015, Steel Gate Valves, Flanged and Butt-Welding Ends
ASME B1.5, Acme Screw Threads
ASME B1.8, Stub Acme Screw Threads
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME B16.5, Pipe Flanges and Flanged Fittings
ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves
ASME B16.11, Forged Fittings, Socket-Welding and Threaded
ASME B16.25, Butt-welding Ends
ASME B16.34:2017, Valves-Flanged, Threads, and Welding End
ASME B46.1, Surface Texture (Surface Roughness, Waviness, and Lay)

ASME B16.47, Large diameter steel flanges: NPS 26 through NPS 60 Metric/Inch Standard

ASME Sec. V, Nondestructive examination, RT, UT, PT mentioned in this document
ASME Sec. VIII, Div.1:2018, Pressure Vessels
ASTM A53, Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless
ASTM A105/A105M, Forgings, Carbon Steel, for Piping Components
ASTM A106, Seamless Carbon Steel Pipe for High-Temperature Service
© ISO 2019 – All rights reserved 1
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ISO 19037:2019(E)

ASTM A182/A182M, Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings and Valves and Parts for

High-temperature Service

ASTM A194/A194M, Carbon and Alloy Steel Nuts and Bolts for High-Pressure and High Temperature Service

ASTM A216/216M, Steel Castings, Carbon Suitable for Fusion Welding for High-Temperature Service

ASTM A312, Grade TP304L, TP316
ASTM A320/A320M, Alloys-Steel Bolting Material for Low-Temperature Service

ASTM A350/A350M, Forgings, Carbon and Low-Alloy Steel, Requiring Notch Toughness Testing for Piping

Components

ASTM A351/A351M, Casting, Austenitic, Austenitic-Ferritic (Duplex), for Pressure-Containing Parts

ASTM A358, Grade 304L, 316L

ASTM A694/694M, Forgings, Carbon and Alloy Steel, for Pipe Flanges, Fittings, Valves, and Parts for High-

Pressure Transmission service
ASTM E186, Reference Radiographs for Heavy-Walled (2 to 41/2-in) Steel Castings
ASTM E446, Reference Radiographs for Steel Castings up to 2in. in Thickness

MSS SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components

(Visual Method)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
nominal diameter

alphanumeric designation of size for components of a pipework system, used for reference purposes

which comprises the letters DN followed by a dimensionless whole number that is related to the physical

size, in millimetres, of the bore or outside diameter of the end connections

Note 1 to entry: The number following the letters DN does not represent a measured value and shall not be used

for calculation purposes except where specified in the relevant standard.

Note 2 to entry: In those standards that use the DN designation system, any relationship between DN and

component dimensions shall be given, e.g. DN/OD or DN/ID.
[SOURCE: ISO 18139:2017, 3.1]
3.2
nominal pressure

numerical designation relating to pressure that is a convenient round number for reference purposes

Note 1 to entry: It is intended that all equipment of the same nominal size (DN) designated by the same PN

number shall have the same mating dimensions appropriate to the type of end connections.

Note 2 to entry: The permissible working pressure depends upon materials, design and working temperature

and has to be selected from the pressure/temperature rating tables in corresponding standards.

2 © ISO 2019 – All rights reserved
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ISO 19037:2019(E)
[SOURCE: ISO 18139:2017, 3.2]
3.3
nominal pipe size
NPS

dimensionless number for the purpose of pipe, flange, or flanged fitting end connection size

identification

Note 1 to entry: The number is not necessarily the same as the flange or flanged fitting inside diameter.

[SOURCE: ISO 18139:2017, 3.3]
3.4
class

alphanumeric designation used for reference purposes related to a combination of mechanical and

dimensional characteristics of a component of a pipework system, which comprises the word “class”

followed by a dimensionless whole number
[SOURCE: ISO 18139:2017, 3.4]
4 Pressure-temperature rating
4.1 Types of fluids
The types of fluids and associated temperatures are shown in Table 1.
Table 1 — Types of fluids
Temperature
Type Liquid density (density)
(in atmospheric pressure)
LNG (Liquefied natural gas) −163 °C to –88 °C 434 kg to 478 kg/m
NG (Natural gas) −160 °C to −65 °C (0,7 kg to 0,89 kg/m )
LN2 (Liquefied nitrogen) −196 °C 804 kg/m
N2 (Nitrogen) −196 °C to −65 °C (1 184 kg/m )
4.2 Working pressure and design temperature

The valve shall be designed to operate without failure or leakage at the extreme temperatures and

pressure ranges expected in service.

Class and maximum working pressure shall satisfy the standard class specified in ASME B16.34.

The manufacturers and the purchasers may reach an agreement when Class exceeds 900.

The working pressure and design temperature for this valve are shown in Table 2.
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ISO 19037:2019(E)
Table 2 — Working pressure and design temperature
Maximum pressure
Class Note
MPa
150 2,0
300 5,2
600 10,3 in ambient temperature
800 13,8
900 15,5

NOTE Working pressure is set following a piping design condition that is provided by the purchasers.

5 Design
5.1 General structure of a gate valve

This valve shall be structured as outside screw and yoke (OS&Y), bolted bonnet (BB), flexible wedge

and extended bonnet. When the valve is opening, the stem of the valve shall be rising. The hand wheel

shall be rising or non-rising. Composition, function and standardization of the valve shall be satisfied

with the requirements of the following sections.
5.2 Materials general

Throughout this document, materials are specified for each of the various parts of the valve. In lieu

of the materials specified, other materials may be used provided they are manufactured by the same

process as the material specified, such as forging, casting, bar, or seamless pipe. In addition, the material

shall be suitable for the operating temperatures of the valve and the materials shall have mechanical

properties, including low temperature impact resistance, and resistance to corrosion equal to or better

than the material specified for the specific valve part.
5.3 Types and materials of body
5.3.1 Types
a) The gate valve shall be a top entry bolted bonnet type.

b) Materials shall be equal quality or better than the materials shown in Table 3. Welded ends type

valve materials may be used for flanged ends types.
Table 3 — Materials by manufacturing method
Materials
Manufacturing
method
Flanged ends type Welded ends type
Forging ASTM A182 F304, F316 ASTM A182 F304L, F316L
Casting ASTM A351 CF8, CF8M ASTM A351 CF3, CF3M
5.3.2 Manufacturing

The valve shall be manufactured per the following procedure except for special orders by the purchaser.

5.3.2.1 A port shall be a ‘full port (full bore) type’, and the inside diameter shall comply with

ASME B16.34:2017, Annex A.
5.3.2.2 Face-to-face and end-to-end dimensions shall satisfy ASME B16.10.
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ISO 19037:2019(E)
5.3.2.3 Minimum wall thickness of the body shall be as shown in ASME B16.34.

5.3.2.4 End connection of the body is classified with ‘welding ends’ type or ‘flanged ends’ type, and

shall be manufactured as below.
5.3.2.4.1 Welding type
a) NPS 2 (DN 50) and under: ‘socket welding ends’
— Class 150, 300: to the requirements of Class 3000 in ASME B16.11
— Class 600: to the requirements of Class 6000 in ASME B16.11
— Class 800 to Class 1500: to the requirements of Class 9000 in ASME B16.11
b) NPS 2 1/2 (DN 65) and over: butt welding ends

— Thickness of connected pipes under schedule 40s shall satisfy schedule 40s and be manufactured

in accordance with ASME B16.25.

— Thickness of connected pipes over schedule 40s: shall satisfy thickness of connected pipes and

be manufactured in accordance with ASME B16.25.

— Thickness of connected pipes shall satisfy ‘line schedules’, which is given by the purchasers.

5.3.2.4.2 Flanged ends type
a) NPS 24 (DN 600) and under: to satisfy ASME B16.5
— Class 150 (PN 20), Class 300 (PN 50): raised face (RF) type flange

— Class 600 (PN 110) and over: large groove face (LGF) type flange or raised face (RF) type flange

b) Over NPS 26: to satisfy ASME B16.47
— Class 150(PN 20), Class 300(PN 50): raised face (RF) type flange

— Class 600 (PN 110) and over: large groove face (LGF) type flange or raised face (RF) type flange

c) Processing accuracy of face shall satisfy ASME B16.5 and ASME B16.47, and also be measured in

accordance with ASME B46.1.
5.4 Design and materials of extended bonnet
5.4.1 Design
Design of the extended bonnet is as follows:

a) Minimum wall thickness shall be thicker than the values shown in ASME B16.34 for corrosion,

thermal stress, etc.

b) Flange connection of the bonnet connected to the body shall satisfy API 600:2015, 2.2.2 to 2.2.4.

c) Length of the extended bonnet shall satisfy ISO 28921-1.

d) An insulation collar and drip plate may be installed on the stem of the extended bonnet where not

insulated.

e) Insulation line shall be specified on a design drawing so that the valve operating area does not freeze.

f) The back seat shall be installed inside of the extended bonnet.
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ISO 19037:2019(E)
5.4.2 Materials

Manufacturing methods shall be casting or welded casting (forging) parts and connected pipe.

a) In case of casting: materials shall be equal to or better than materials specified for the body

b) Welded casting (forging) part and connected pipe
— Casting area: ASTM A351 CF3, CF3M
— Forging area: ASTM A182 F304L, F316L
— Connected pipe area: ASTM A312 or equal to ASTM A358 304L, 316L or better

— Connected pipe shall be seamless pipe or one longitudinal seam; orbital welding methods are

not allowed.
5.5 Design types and materials of wedge
5.5.1 Design
5.5.1.1 The wedge shall be one piece and of the flexible type.

5.5.1.2 Wear of the seat ring shall be minimized when the wedge and shell are working, and a wedge

guide shall be installed to align the wedge and stem in a line.

5.5.1.3 Flow direction shall be specified by the customer. The valve shall be manufactured based on

the requirements below in order to prevent abnormal pressures that may result from evaporating liquid

remaining in the sealed structure of the valve body when the valve is closed.
5.5.1.4 Unidirectional valve

— A vent hole shall be manufactured in the upstream side of the wedge to balance pressure in the

centre cavity.
5.5.1.5 Bidirectional valve

— A system to remove abnormally high pressure in the valve cavity shall be installed as follows:

a) Materials: austenitic steel and stainless steel
b) Standardization and size: the thread manufacture shall satisfy ASME B1.20.1
— NPS 1/2 thick-walled stub (thread)

— NPS 1/2 body root ball valve (thread, class and material is the same as gate valve body or

better material)
— NPS 1/2 pipe (thread, relief valve, using front side)

— NPS 1/2X3/4 cavity relief valve (thread, valve pressure levels are the same as the gate valve

pressure)
— NPS 3/4 pipe (thread, relief valve, using back side)
5.5.2 Materials

Materials shall satisfy ASTM A182 F316, ASTM A351 CF8M or equal and better than body’s materials.

A part which is adhered to a seat ring needs a hard surface treatment to improve wear resistance. The

thickness of hard surface treatment shall be at least 1,6 mm.
6 © ISO 2019 – All rights reserved
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ISO 19037:2019(E)
5.6 Types and materials of stem
5.6.1 Design
a) A stem shall be an ‘extended stem type’ unless there are special orders.
b) Minimum diameter of the stem shall satisfy API 600:2015.

c) A stem part connected to the wedge shall not be detached when the valve is working and it shall

have sufficient strength.

d) The outer surface of the stem shall precisely adhere to packing in order to retain sealing, and be

accurately fabricated (surface roughness: less than 0,8 µm) to not be damaged when the valve is

working.

e) When the valve is fully open, the stem parts contacting the back seat shall be made in ‘coning type’

or ‘spherical type’ to adhere to the back seat correctly.
f) Threads of the stem shall satisfy ASME B1.5 or ASME B1.8.
5.6.2 Materials

Materials of a stem shall be ASTM A182 F316, or equal to or better than body’s materials.

5.7 Stem sealing

a) The stem shall be sealed with an appropriate structure (e.g. stem packing, lantern ring) to prevent

leakage.

b) Packing for stem sealing shall have enough sealing characteristics and strength to prevent damages

when the valve is open/closed repeatedly.

c) The packing materials for stem sealing may be PTFE, or other materials agreed to between

manufacturer and purchaser. However, packing materials shall not chemically react to the working

fluid or otherwise create physical deposits.
d) Packing arrangements for stem sealing shall be easily replaceable.
5.8 Types and materials of a seat ring
5.8.1 Design

The seat ring and wedge width of the valve body shall satisfy API 600 2.3.9, considering wear between

the seat ring and wedge as a result of the stem’s reciprocating motion when the valve is opened.

5.8.2 Materials

Materials for the seat ring shall be ASTM A182 F316, or equal to or better than body’s materials. A part

that adheres to a face of a wedge needs a hard facing treatment to improve wear resistance. In case

of the soft seat type wedge (disc), hard facing of seat face is not required. The thickness of any hard

surface treatment shall be thicker than 1,6 mm.
5.9 Types and materials of bolts and nuts
5.9.1 Design
Bolts and nuts for
...

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