gas cylinders — 17e and 25e taper threads for...

BS EN ISO11363-1:2010

ICS 21.040.30; 23.020.30

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BRITISH STANDARD

Gas cylinders — 17Eand 25E taper threadsfor connection ofvalves to gas cylindersPart 1: Specifications (ISO11363-1:2010)

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July2010© BSI 2010

ISBN 978 0 580 63328 7

Amendments/corrigenda issued since publication

Date Comments

BS EN ISO 11363-1:2010

National foreword

This British Standard is the UK implementation of EN ISO 11363-1:2010. It supersedes BS EN 629-1:1996 and BS EN ISO 11116-1:1999 which are withdrawn.The UK participation in its preparation was entrusted to Technical Committee PVE/3/1, Gas containers - Valve fittings for gas containers.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN ISO 11363-1

May 2010

ICS 23.020.30 Supersedes EN 629-1:1996, EN ISO 11116-1:1999

English Version

Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-

1:2010)

Bouteilles à gaz - Filetages coniques 17E et 25E pour le raccordement des robinets sur les bouteilles à gaz - Partie

1: Spécifications (ISO 11363-1:2010)

Gasflaschen - 17E und 25E kegeliges Gewinde zur Verbindung von Ventilen mit Gasflaschen - Teil 1:

Spezifikationen (ISO 11363-1:2010)

This European Standard was approved by CEN on 23 January 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A LI S A T I O N EUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

Ref. No. EN ISO 11363-1:2010: E

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BS EN ISO 11363-1:2010EN ISO 11363-1:2010 (E)

3

Foreword

This document (EN ISO 11363-1:2010) has been prepared by Technical Committee ISO/TC 58 "Gas cylinders" in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2010, and conflicting national standards shall be withdrawn at the latest by November 2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 629-1:1996, EN ISO 11116-1:1999.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Endorsement notice

The text of ISO 11363-1:2010 has been approved by CEN as a EN ISO 11363-1:2010 without any modification.


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)

© ISO 2010 – All rights reserved iii

Contents Page

Foreword ............................................................................................................................................................iv Introduction.........................................................................................................................................................v 1 Scope ......................................................................................................................................................1 2 Terms and definitions ...........................................................................................................................1 2.1 General ...................................................................................................................................................1 2.2 Terms relating to cones ........................................................................................................................2 2.3 Terms relating to diameter ...................................................................................................................2 2.4 Terms relating to reference ..................................................................................................................3 3 Requirements.........................................................................................................................................4 3.1 Thread handedness...............................................................................................................................4 3.2 Taper .......................................................................................................................................................4 3.3 Thread profile.........................................................................................................................................4 3.4 Pitch, P....................................................................................................................................................4 3.5 Dimensions ............................................................................................................................................4 4 Thread end finish...................................................................................................................................7 5 Marking...................................................................................................................................................8 Bibliography........................................................................................................................................................9

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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)

iv © ISO 2010 – All rights reserved

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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 11363-1 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings.

This first edition of ISO 11363-1 cancels and replaces ISO 10920:1997 and ISO 11116-1:1999.

ISO 11363 consists of the following parts, under the general title Gas cylinders — 17E and 25E taper threads for connection of valves to gas cylinders:

⎯ Part 1: Specifications

⎯ Part 2: Inspection gauges


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)

© ISO 2010 – All rights reserved v

Introduction

Gas cylinders intended to contain compressed, liquefied or dissolved gas under pressure are fitted with accessories to allow release and refilling of gas. Hereinafter, the term “valve” will apply to such accessories.

The connection between cylinder and valve is obtained by assembly of two taper-threads (an external one on the valve stem and an internal one in the cylinder neck), both having the same nominal taper, thread pitch and thread profile.

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BS EN ISO 11363-1:2010


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BS EN ISO 11363-1:2010

INTERNATIONAL STANDARD ISO 11363-1:2010(E)

© ISO 2010 – All rights reserved 1

Gas cylinders — 17E and 25E taper threads for connection of valves to gas cylinders —

Part 1: Specifications

1 Scope

This part of ISO 11363 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 17E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders.

It does not cover the connection requirements for:

⎯ mechanical strength;

⎯ gas tightness;

⎯ capability of repeated assembly and dismounting operations.

Gauge inspection is covered by ISO 11363-2.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

2.1 General

2.1.1 basic profile theoretical profile, when the profile of the external thread coincides with the profile of the internal thread

2.1.2 design profile design profile differs from the basic profile due to the radius of the root, necessary for manufacturing and strength requirements

NOTE For such a profile, manufacturing tolerances are taken into account.

2.1.3 length of external thread, l2 length of full form thread on the valve stem, measured along the cone axis from the reference plane A

NOTE See Figure 1, Table 1 and Table 3.

2.1.4 length of internal thread, L2 length of full form thread in the cylinder neck, measured along the cone axis from the reference plane F

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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)

2 © ISO 2010 – All rights reserved

NOTE See Figure 1, Table 2 and Table 4.

2.1.5 pitch P distance, measured parallel to the cone surface, between two homologous points of two parallel consecutive flanks of the same thread

NOTE See Figures 2 and 3.

2.1.6 taper ratio of the difference of two diameters corresponding to planes normal to the axis of the reference cone, and the axial distance between the same planes

NOTE Taper can be expressed as a ratio, as an angle or as a percentage.

2.1.7 thread profile thread shape obtained by the intersection of a plane through the thread axis and the threaded surface

2.1.8 valve stem tapered end of the valve body (inlet connection), with a thread formed on the external surface of the truncated cone

NOTE See Figure 1.

2.1.9 cylinder neck thread tapered axial hole in the cylinder neck, with a thread formed on the internal surface of the truncated cone

NOTE See Figure 1.

2.2 Terms relating to cones

2.2.1 major cone cone bounding the crests of the thread of the valve stem, or the roots of the cylinder neck thread

2.2.2 minor cone cone bounding the roots of the thread, of the valve stem, or the crests of the cylinder neck thread

2.2.3 pitch cone cone passing, coaxially and midway, between the major and minor cones

2.3 Terms relating to diameter

NOTE See Figure 1.

2.3.1 major diameter, d1e diameter of the major cone at the valve stem thread reference plane A (before any chamfer is cut)

2.3.2 major diameter, D1e diameter of the major cone at reference plane G


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


2.3.3 minor diameter, d1i diameter of the minor cone at the valve stem thread reference plane A (before any chamfer is cut)

2.3.4 minor diameter, D1i diameter of the minor cone at reference plane G

2.3.5 pitch diameter, d1p diameter of the pitch cone at the valve stem thread reference plane A (before any chamfer is cut)

2.3.6 pitch diameter, d2p diameter of the pitch cone at reference plane B

2.3.7 pitch diameter, D1p diameter of the pitch cone at reference plane G

2.3.8 pitch diameter, D2p diameter of the pitch cone at reference plane F (before any chamfer is cut)

2.4 Terms relating to reference

NOTE See Figure 1.

2.4.1 reference length, l1 reference dimension being the distance between the parallel reference planes A and B

2.4.2 reference length, L1 reference dimension being the distance between the parallel reference planes F and G

2.4.3 reference plane A reference plane coincident with the small end face of the threaded valve stem and corresponding to diameters d1i, d1p and d1e

2.4.4 reference plane B reference plane at a distance l1 from reference plane A and corresponding to diameter d2p

2.4.5 reference plane F reference plane coincident with the entry section face of the cylinder neck thread and corresponding to pitch diameter D2p

2.4.6 reference plane G reference plane at a distance L1 from reference plane F and corresponding to diameter D1e, D1p and D1i

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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


3 Requirements

3.1 Thread handedness

The thread shall be a right-hand thread, such that it moves away from an observer when rotated clockwise.

3.2 Taper

The nominal values for the taper are the following.

⎯ Taper ratio: 3/25.

⎯ Taper angle: 6° 52′.

⎯ Taper slope: 12 %.

3.3 Thread profile

The thread profile is a British Standard Whitworth (BSW)1) form with a 55° angle. The form and thread height measurements are perpendicular to the cone surface (see Figure 3).

It is crucial that the thread profile is cut in this way and not perpendicular to the axis of the cone.

3.4 Pitch, P

The nominal pitch is 1,814 mm (derived from 25,4 mm14

) (see Figure 3).

3.5 Dimensions

Dimensions are given in Figure 1 and the values are given in Table 4.

1) A coarse thread devised and standardized in 1841 by British engineer Sir Joseph Whitworth (1803-87). It has an angle of thread of 55° and ranges in size from 1/16 in to 2 1/2 in. It is used in many types of engineering throughout the world, although in the UK its use is now being superseded by the ISO metric system (ISO 68-1).


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


Dimensions in millimetres

Key 1 valve stem thread profile 2 cylinder neck thread profile D2p pitch diameter L1 reference length L2 length of internal thread F reference plane, F G reference plane, G

Figure 1 — Thread reference planes and diameters

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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


Table 1 — Valve stem thread dimensions for 17E


Major diameter

Pitch diameter

Minor diameter

Pitch diameter

Reference length

Length of external threadValve stem

d1e d1p d1i d2p l1 l2

Dimension 17,28 16,118 14,956 18,638 21 W 21

Tolerance 0,120

+ 0,120

+ 0,120

+ 0,120

+ — —

Table 2 — Cylinder neck thread dimensions for 17E


Major diameter

Pitch diameter

Minor diameter

Pitch diameter

Reference length

Length of internal threadCylinder neck

thread D1e D1p D1i D2p L1 L2

Dimension 17,16 15,998 14,834 18,038 17 W 17

Tolerance 00,12− 0

0,12− 00,12− 0

0,12− — —

Table 3 — Valve stem thread dimensions for 25E


Major diameter

Pitch diameter

Minor diameter

Pitch diameter

Reference length

Length of external threadValve stem

d1e d1p d1i d2p l1 l2

Dimension 25,68 24,518 23,356 27,638 26 W 26

Tolerance 0,120

+

0,120

+

0,120

+

0,120

+ — —

Table 4 — Cylinder neck thread dimensions for 25E


Major diameter

Pitch diameter

Minor diameter

Pitch diameter

Reference length

Length of internal threadCylinder neck

thread D1e D1p D1i D2p L1 L2

Dimension 25,16 23,998 22,836 26,638 22 W 22

Tolerance 00,12−

00,12−

00,12−

00,12− — —


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


4 Thread end finish

The thread of the valve stem shall have a 45° chamfer postioned 1 mm to 2 mm (maximum) from reference plane A at the bottom part and a groove at the top (see Figure 1). The first thread (small end) shall be fully formed and shall exhibit maximum clearance (d1i shall be minimum).

The thread of the cylinder neck shall have a 45° chamfered opening between 1 mm and 2 mm maximum from plane F (see Figure 1). The execution of the neck thread shall be as shown in Figure 2.

Key A option A B option B C option C (not allowed)

Figure 2 — Execution of cylinder neck threads

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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


Key P pitch 1 valve stem thread profile 2 cylinder neck thread profile a Thread axis. b Basic profile. c Design profile.

Figure 3 — Thread profiles

5 Marking

Valves and cylinders threaded in accordance with this International Standard shall be marked by the symbol “17E” or “25E” as applicable.


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BS EN ISO 11363-1:2010ISO 11363-1:2010(E)


Bibliography

[1] ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads

[2] ISO 10920:1997, Gas cylinders — 25E taper thread for connection of valves to gas cylinders — Specification

[3] ISO 11116-1:1999, Gas cylinders — 17E taper thread for connection of valves to gas cylinders — Part 1: Specifications

[4] ISO 11363-2, Gas cylinders — 17E and 25E taper threads for connection of valves to gas cylinders — Part 2: Gauge inspection

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BS EN ISO11363-1:2010

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gas cylinders — 17e and 25e taper threads for...

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