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

This document specifies requirements for design, manufacture, and test methods of cryogenic butterfly valves in order to have an excellent quality leakage stability in a very low temperature service (−196 °C to 80 °C). It is applicable to valves of nominal sizes: DN: 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600 corresponding to nominal pipe size (NPS): 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24.

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

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Status
Published
Publication Date
28-Oct-2018
Current Stage
6060 - International Standard published
Start Date
23-Sep-2018
Completion Date
29-Oct-2018
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ISO 21159:2018 - Ships and marine technology -- Butterfly valves for use in low temperature applications -- Design and testing requirements
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INTERNATIONAL ISO
STANDARD 21159
First edition
2018-11
Ships and marine technology —
Butterfly valves for use in low
temperature applications — Design
and testing requirements
Navires et technologie maritime — Robinets à papillon destinés aux
applications à basse température — Exigences de conception et d'essai
Reference number
ISO 21159:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 21159:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 21159:2018(E)
Contents Page

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

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

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

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

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

5 Structure ....................................................................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.1.1 Structure ................................................................................................................................................................................. 3

5.1.2 Materials ................................................................................................................................................................................. 4

5.2 Design and materials of the body............................................................................................................................................ 4

5.2.1 Design ........................................................................................................................................................................................ 4

5.2.2 Materials ................................................................................................................................................................................. 4

5.2.3 Manufacturing .................................................................................................................................................................... 4

5.3 Design and materials of the extended bonnet ............................................................................................................. 5

5.3.1 Design ........................................................................................................................................................................................ 5

5.3.2 Materials ................................................................................................................................................................................. 5

5.4 Design and materials of the disc .............................................................................................................................................. 5

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

5.4.2 Materials ................................................................................................................................................................................. 5

5.5 Design and materials of the stem ............................................................................................................................................ 5

5.5.1 Design ........................................................................................................................................................................................ 5

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

5.6 Stem sealing ............................................................................................................................................................................................... 6

5.7 Design and materials of the seat .............................................................................................................................................. 6

5.7.1 Design ........................................................................................................................................................................................ 6

5.7.2 Bore materials .................................................................................................................................................................... 6

5.8 Design and materials of the connection ............................................................................................................................ 7

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

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

5.9 Requirements of operating device and actuators ..................................................................................................... 7

5.10 Surface treatment ................................................................................................................................................................................. 7

5.11 Welding and heat treatment ........................................................................................................................................................ 8

5.11.1 Welding .................................................................................................................................................................................... 8

5.11.2 Heat treatment................................................................................................................................................................... 8

5.12 Repair welding ........................................................................................................................................................................................ 8

6 Test and inspection ............................................................................................................................................................................................ 8

6.1 General ........................................................................................................................................................................................................... 8

6.2 Material test ............................................................................................................................................................................................... 8

6.3 Non-destructive inspection .......................................................................................................................................................... 8

6.3.1 General...................................................................................................................................................................................... 8

6.3.2 Radiographic testing (RT) ........................................................................................................................................ 9

6.3.3 Dye penetrant testing (PT) ...................................................................................................................................... 9

6.3.4 Ultrasonic Testing (UT) .............................................................................................................................................. 9

6.3.5 Retest ......................................................................................................................................................................................10

6.3.6 Submission of inspection results ....................................................................................................................10

6.4 Dimension check ................................................................................................................................................................................10

6.5 Visual inspection ................................................................................................................................................................................10

6.6 Heat treatment inspection .........................................................................................................................................................10

6.7 Operating tests .....................................................................................................................................................................................10

6.8 Pressure test ...........................................................................................................................................................................................10

6.8.1 Pressure test in ambient temperature .......................................................................................................10

6.8.2 Test procedure and method ................................................................................................................................11

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ISO 21159:2018(E)

6.9 Fire-resistance test (if necessary) .......................................................................................................................................11

6.10 Anti-static testing...............................................................................................................................................................................11

6.11 Cryogenic tests .....................................................................................................................................................................................11

6.11.1 General...................................................................................................................................................................................11

6.11.2 Scope of tests ....................................................................................................................................................................12

6.11.3 Test procedure ................................................................................................................................................................12

6.11.4 Submission of test results .....................................................................................................................................13

7 Marking .......................................................................................................................................................................................................................13

Annex A (informative) Examples of butterfly valve construction ........................................................................................14

iv © ISO 2018 – All rights reserved
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ISO 21159:2018(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 on 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 the following

URL: 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 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 21159:2018(E)
Ships and marine technology — Butterfly valves for use
in low temperature applications — Design and testing
requirements
1 Scope

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

valves in order to have an excellent quality leakage stability in a very low temperature service (−196 °C

to 80 °C).

It is applicable to valves of nominal sizes: DN: 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600

corresponding to nominal pipe size (NPS): 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24.

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 5211, Industrial valves — Part-turn actuator attachments

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

manufacturing and production testing
ISO 10497, Testing of valves — Fire type-testing requirements
API 609, Butterfly Valves: Double flanged, lug and wafer-type
ASME B 16.5, Pipe Flanges and Flanged Fittings
ASME B 16.10, Face-to-Face and End-to-End Dimensions of Valves
ASME B 16.25, Buttwelding Ends
ASME B16.34:2007, Valves — Flanged, Threaded, and Welding End
Sec ASME V, Non-destructive Examination
Sec ASME VIII, Pressure vessels

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

High-temperature Service

ASTM A193/A193M, Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature

or High Pressure Service and Other Special Purpose Applications

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

ASTM A276, Standard Specification for Stainless Steel Bars and Shapes

ASTM A312/A312M, Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic

Stainless Steel Pipes
© ISO 2018 – All rights reserved 1
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ISO 21159:2018(E)
ASTM A320/A320M, Alloys-Steel Bolting material for Low-Temperature service

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

ASTM E186, Reference Radiographs for Heavy-Walled (2 to 4 1/2-in) Steel Castings
ASTM E446, Reference Radiographs for Steel Castings up to 2in. in Thickness
MSS SP-44. Steel pipeline flanges

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 purpose of this document, the following terms and definitions apply.

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

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

alphanumeric designation of size for components of a pipe-work system, used for reference purposes,

comprising the letters DN followed by a dimensionless whole number which is indirectly 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 measure value and shall not be used

for calculation purposes except where specified in the relevant standard.

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

component dimensions shall be given, e.g. DN/OD or DN/ID.
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. 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.
3.3
nominal pipe size
NPS

alphanumeric designation of size that is common for components used in a piping system, used for

reference purposes, comprising the letters NPS followed by a dimensionless number having an indirect

correspondence to the physical size of the bore or outside diameter of the component end connections.

Note 1 to entry: The dimensionless number may be used as a size identifier without the prefix NPS. The

dimensionless number does not represent a measurable value and is not used for calculation purposes.

Note 2 to entry: Prefix NPS usage is applicable to components bearing Class designations according to ISO 7268.

2 © ISO 2018 – All rights reserved
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ISO 21159:2018(E)
3.4
class

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

dimensional characteristics of a component of a pipe-work system, comprising the word “class” followed

by a dimensionless whole number
4 Pressure-temperature rating
4.1 The types of typical fluid are shown in Table 1.
Table 1 — Types of typical fluid
Fluid Temperature (in atmospheric pressure) Liquid density (density)
LNG (Liquefied natural gas) −163 °C to −88 °C (434 to 478) kg/m
NG (Natural gas) −160 °C to −65 °C (0,7 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 The valve shall be designed to operate without failure or leakage at the extreme temperature and

pressure ranges expected in service. The maximum working pressure and design temperature are shown

in Table 2.
Table 2 — Maximum working pressure
Maximum working pressure
PN Class Note
MPa(psi)
20 150 2,0(290)
in ambient temperature
50 300 5,2(750)

NOTE The piping design condition including, but not limited to, working pressure, service temperature and

fluid is provided by the purchasers.

4.3 The manufacturers and purchasers may reach an agreement when Class exceeds 300.

4.4 Design temperature should be between −196 °C and 80 °C.
5 Structure
5.1 General
5.1.1 Structure

Butterfly valves can be divided into two types, with maintenance holes and without maintenance

holes. For butterfly valves with maintenance holes, the disc or seat sealing shall be removable from the

maintenance hole without removing the valve from the pipe. The butterfly valve is extended bonnet

type. The end connection of the body is welding ends type or flanged ends type. A wheel or levers

is used to apply the turning torque or thrust to open or close the valve. The butterfly valve may be

either soft-seated or metal-seated. Configuration and functions of the butterfly valve are shown in this

document. If there are some differences from this document, the manufacturers can make a decision

after reaching an agreement with the purchasers. General examples of the structure of the valve are

shown in Annex A.
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ISO 21159:2018(E)
5.1.2 Materials

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

be suitable for the operating temperatures and pressure of the valve and the metal 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.
5.2 Design and materials of the body
5.2.1 Design

The body should be casting integrally, in case the valve contains suitably located lugs which have sufficient

strength to support the valve lift and valve support legs, they cannot affect the connection bolts.

5.2.2 Materials

Materials are shown in Table 3. Materials for ‘welding ends’ type valves may be used for ‘flange ends’

type material.
Table 3 — Materials by manufacturing method
Materials
Manufacturing method
Flange ends type Welding ends type
Casting ASTM A351 CF8M ASTM A351 CF3M
5.2.3 Manufacturing

The valve shall be manufactured according to the following requirements except when there are

purchaser’s special orders.

a) Face-to-face and end-to-end dimensions of flange ends type shall satisfy ASME B16.10. Face-to-face

and end-to-end dimensions of welding ends type shall reach an agreement between purchasers and

manufacturers.

b) The minimum wall thickness shall be equal to or thicker than the values shown in ASME

B16.34:2007 6.1.
c) The end connection of the body shall be manufactured as specified below:
1) butt welding ends:

— according to the wall thickness of connected pipes which is given by the purchasers,

manufactured according to ASME B16.25; and

— the butt welding ends may add a short stub if specified in the order. The wall thickness shall

conform to the requirements of purchasers;
2) flange ends type:

— NPS 24(DN 600) and under, except NPS22(DN550): to be manufactured in accordance with

ASME B16.5; and
— NPS 22(DN 550): to be manufactured in accordance with MSS SP-44.
4 © ISO 2018 – All rights reserved
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ISO 21159:2018(E)
5.3 Design and materials of the extended bonnet
5.3.1 Design
The extended bonnet shall meet the following:

a) the minimum wall thickness shall conform to ASME B 16.34:2007 6.1 and the operation torque

produced by actuators shall be considered when determining the neck thickness;

b) the minimum bonnet extension length shall satisfy ISO 28921-1 or shall be sufficient to maintain

the stem packing at a temperature high enough to permit operation within the normal temperature

range of the packing material;

c) drip plate may be installed by welding or clamping; the welding procedure for the drip plate is

beyond the requirements of 5.11;

d) lifting points are optional; the manufacturer shall ensure the necessity of lifting points and verify

the suitability.
5.3.2 Materials
Materials are shown in Table 3 for the valve body.

If short pipe is used for the extended bonnet, it shall be seamless and made of ASTM A312 or 316L.

5.4 Design and materials of the disc
5.4.1 Design
The disc shall meet the following:
a) it shall be eccentric;

b) it shall be able to ensure the maximum working pressure without deleterious deformation and

damage;

c) the connection with the stem should be without leakage and have e.g. spline, taper pins, etc. that

can effectively deliver stem torque, and can prevent loosening caused by the vibration;

d) the gap between the disc and the pipe shall meet at least the provisions of API 609, but the

purchaser should review the structure of the pipeline to ensure that the disc in the open with the

adjacent piping components, such as check valves, filters, gaskets, etc., does not interfere with the

other parts;

e) the sealing face of the valve should be designed with metal-to-metal or metal-to-soft seal.

5.4.2 Materials

The disc materials shall be ASTM A351 CF8M. The surface of the sealing part shall be adhered with

hard alloy. If overlay hard surface is selected, its thickness should be at least 1,6 mm.

5.5 Design and materials of the stem
5.5.1 Design
The stem shall meet the following.
a) It shall be of an extended type.
© ISO 2018 – All rights reserved 5
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ISO 21159:2018(E)

b) The critical section of the stem should be in addition to the valve pressure interface, the torsional

strength of the stem shall be at least 10 % greater than the pressure outside interface, and able to

withstand 1,5 times the maximum working pressure under load.

c) The butterfly valve shall have an anti-static device if specified by the order.

d) The butterfly valve shall be designed to ensure that the stem does not eject under any internal

pressure condition or if the packing gland components and/or valve operator mounting components

are removed.
5.5.2 Materials

Materials shall be ASTM A182 F316 and ASTM A276 316, and allow the sealing surface or high stress

surface hardening process.
5.6 Stem sealing
The requirements for stem sealing shall be as follows.

a) The stem packing should be designed to help maintain the shape of the sealing.

b) The stem shall be sealed in the appropriate form and structure (e.g. stem packing, lantern ring) to

prevent leakage and shall be easily adjustable.

c) The packing materials for stem sealing may be graphite or PTFE. Use of other materials shall be by

agreement. However, they shall not chemically react to the working fluid or make physical deposits.

5.7 Design and materials of the seat
5.7.1 Design
The seat shall meet the following.

a) The whole seating surface shall contact with the disc when the butterfly valve is in the closed

position.

b) A soft seated valve shall be designed to ensure that the packing does not eject or shift by internal

pressure during opening or closing.
5.7.2 Bore materials
The seat ring materials shall meet the following.

a) The selection and use of soft seat materials shall ensure reliable performance under working

temperature, for example PCTFE, etc.

b) Where a soft seating ring is placed in a metal circle, the metal material shall be ASTM A182 F316.

c) The base material of the metal seating ring shall be ASTM A182 F316. The seating surface needs a

hard facing treatment. If overlay hard surface is selected, its thickness should be at least 1,6 mm.

d) Where a seat contains elastic metal materials, it shall have reliable performance in low temperature

conditions, such as nickel-based alloy.
6 © ISO 2018 – All rights reserved
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ISO 21159:2018(E)
5.8 Design and materials of the connection
5.8.1 Design
The connections shall meet the following.

a) The design of the body joint bolting shall satisfy the relevant requirements of ASME B16.34. The

minimum size should be M10.
b) The design of actuators conn
...

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