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1、AS 1722.11975 Australian Standard Pipe threads of Whitworth form Part 1: Sealing pipe threads (metric units) Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 The following scientific, industrial and governmental organizations and departments were officially represented on the committee entru
2、sted with the preparation of this standard: Airconditioning and Refrigeration Equipment Manufacturers Association of Australia Associated Chambers of Manufactures of Australia Australian and New Zealand Railways Conferences Australian Institute of Refrigeration, Air Conditioning and Heating Australi
3、an Liquefied Petroleum Gas Association Brassware Manufacturers Association of Victoria Dairy Equipment Manufacturers Association of Australia Department of Defence (Army and Materials Research Laboratory) Department of Manufacturing Industry (Ammunitions Factory) Department of Technical Education, N
4、.S.W. Electricity Supply Association of Australia Fasteners Institute of Australia Federal Chamber of Automotive Industries Federation of Automotive Products Manufacturers Metal Trades Industry Association of Australia National Measurement Laboratory Petroleum Refinery Engineers Advisory Committee P
5、ostmaster-Generals Department Society of Automotive EngineersAustralasia The Institution of Engineers, Australia The Institution of Production Engineers Sydney Metropolitan Water, Sewerage and Drainage Board This standard, prepared by Committee ME/28, Screw Threads, was approved on behalf of the Cou
6、ncil of the Standards Association of Australia on 13 November 1974. Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important therefore
7、that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Australian Standards and related publications will be found in the Standards Australia Catalogue of Publications; this information is supplemented each month by the magazine
8、 The Australian Standard, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Australian Standards, addressed to the head office of Standards Australia, are welcomed. Notification of
9、any inaccuracy or ambiguity found in an Australian Standard should be made without delay in order that the matter may be investigated and appropriate action taken. This standard was issued in draft form for public review as DR 73114. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722.1
10、1975 Australian Standard Pipe threads of Whitworth form Part 1: Sealing pipe threads (metric units) First published. . . . . . . . . . . . . . . . . . . . . . . .1975 Reprinted . . . . . . . . . . . . . . . . . . . . . . . . . . . .1975 Reprinted . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、 .1983 PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140 ISBN 0 7262 0653 9 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722, Part 119752 PREFACE This standard was prepared by the Associations Committee on Screw Threads as a metr
12、ication and revision of AS B53 1961 which was an endorsementwith amendment of BS 21:1957, and which it accordingly supersedes. Part 2 of this standard deals with fastening pipe threads, which were formerly specified in AS B154. Except for the method of designation, the external taper pipe threads an
13、d internal pipe threads given in this standard are in agreement with ISO 7* which was based on BS 21:1957, but it is wider in scope than both, particularly in the description of gauges and gauging methods. In response to a demand from Australian industry the long screw thread is included in this sta
14、ndard, but is not given in ISO 7. A new method of designating pipe threads is introduced. Current Australian practice is to designate pipe size by metric nominal bore (e.g. 50 NB) whereas ISO 7 designates pipe threads by imperial nominal bore (e.g. RP2). This standard reconciles these conflicting me
15、thods of designating by adopting a dual number (e.g. RP2/50). The standard retains the Gauging System B of BS 21:1957 as recommended in the endorsement of that standard as AS B53. The committee is aware of the wide use of parallel ring gauges for gauging taper external threads and there are signs of
16、 a trend towards the use of these gauges in international standards; however at this time there are not national or international standards for such gauges. Should there be further developments in this matter, the method of gauging in this standard will be reviewed. Attention is drawn to the use of
17、the decimal comma in this standard. Its use in situations where ambiguity does not arise is recognized by the Metric Conversion Board, and the comma is used in new Australian standards primarily concerned with drawing practice and workshop design. CopyrightSTANDARDS AUSTRALIA Users of Standards are
18、reminded that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may be reproduced, stored in a retrieval system in any form or transmitted by a
19、ny means without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia. Standards Australia will perm
20、it up to 10 percent of the technical content pages of a Standard to be copied for use exclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia. Standards Australia will also permit the inclusion of its copyright material in computer software pr
21、ograms for no royalty payment provided such programs are used exclusively in-house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of
22、 the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.
23、*ISO 7, Pipe Threads for Gas List Tubes and Screwed Fittings Where Pressure-tight Joints are made on the Threads (1/8inch to 6 inches). Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 3AS 1722, Part 11975 CONTENTS Page SECTION1. SCOPE ANDGENERAL 1.1Scope . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . .4 1.2Standard Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.3Designation of Threads and Joints . . . . . . . . . . . . . . . . . . . . . . . .4 1.4Terms and Definitions. . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . .5 SECTION2. THREADFORM,LIMITS ANDASSEMBLY 2.1Basic and Design Forms (Profiles) . . . . . . . . . . . . . . . . . . . . . . .12 2.2Limiting Dimensions, Tolerances and Deviations. . . . . . . . . . . .13 2.3Assembly of Sealing Pipe Threads . . . . . . . . . . . . . . . . . . . . .
26、. .15 SECTION3. GAUGES ANDGAUGINGPRACTICE 3.1General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 3.2Sealing Pipe Threads, Series RC, RP and RTypes of Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 3.3Description
27、and Use of Gauges . . . . . . . . . . . . . . . . . . . . . . . . .16 3.4Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 TABLES 1Limiting Dimensions for Taper Pipe Threads of Series R and RC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . .8-9 2Limiting Dimensions for Internal Pipe Threads of Series RP. .10-11 2A Minimum Length of Useful Thread on Pipe End . . . . . . . . . . .10-11 3Dimensions of Taper Screw and Taper Plain Plug and Ring Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
29、0-21 4Tolerance for Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-23 FIGURES 1Terms Related to Pipe Threads. . . . . . . . . . . . . . . . . . . . . . . . . .7 2Basic Whitworth Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 3Basic Form of Taper Pipe Threa
30、d. . . . . . . . . . . . . . . . . . . . . . .13 4Tolerance Zones for Diameters of Sealing Pipe Threads . . . . . . . .13 5Limiting Conditions of Hand-tight Assembly of Taper Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 6Taper Full Form Screw Ring
31、Product Gauge . . . . . . . . . . . . . . . .18 7Taper Plain Ring Product Gauge . . . . . . . . . . . . . . . . . . . . . . . .18 8Taper Full Form Screw Plug Product Gauge . . . . . . . . . . . . . . . .18 9Taper Plain Plug Product Gauge. . . . . . . . . . . . . . . . . . . . . . . .18 10Gauging Ext
32、ernal Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 11Gauging Internal Product. . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1772, Part 119754 STANDARDS ASSOCIATION OF AUSTRALIA Australian Standard for PIP
33、E THREADS OF WHITWORTH FORM PART 1SEALING PIPE THREADS SECTION 1. SCOPE AND GENERAL 1.1 SCOPE.This standard specifies the geometry of screw threads suitable for connecting pipes (tubes) used for conveying fluids. It is based on ISO 7 and covers taper and parallel thread varieties, intended for seali
34、ng on the thread because of the taper. It also includes parallel external threads of the Longscrew Series of BS 21:1973, Pipe Threads for Tubes and Fittings where Pressure-tight Joints are made on the Threads (see Clause 2.2.5). The standard covers the range of nominal bore sizes 1/16 in (4 mm) to 6
35、 in (150 mm) both inclusive. 1.2 STANDARD SERIES. The standard provides for two series of internal threads and two of external threads as follows: Internal taper pipe threadSeries designation RC Internal parallel pipe threadSeries designation RP External taper pipe threadSeries designation R Externa
36、l parallel longscrew threadSeries designation RL. 1.3DESIGNATION OF THREADS AND JOINTS. The full designation of pipe threads and threaded pipe joints, subject to provisions of this specification, shall comprise the series designation followed by the nominal size (bore) expressed in inches and in mil
37、limetres, as shown in the example below (for nominal sizes see columns 1 and 2 of Tables 1 and 2). (a)Examples of complete designations.Designation Sealing taper pipe thread, external, nominal size = 1/8/6 R1/8/6 Sealing taper pipe thread, internal, nominal size = 11/2/40RC11/2/40 Sealing parallel p
38、ipe thread, internal, nominal size = 5/125. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RP5/125 Sealing parallel longscrew thread, external, nominal size = 1/25RL1/25 COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 5AS 1772, Part 11975 (b) Examples o
39、f designations for threaded pipe joints. Sealing on thread pipe connection, taper external thread and parallel internal thread of 3/4/20 nominal size RP/R 3/4/20 Sealing type connection of longscrew thread and RP socketRP/RL 3/8/10 1.4 TERMS AND DEFINITIONS. For general screw thread terms and defini
40、tions see AS , Screw Thread Terms and Definitions.* Certain important terms for taper pipe threads are defined below (see also Fig. 1). 1.4.1 Pitch conean imaginary cone, which intersects the surface of a taper thread in such a manner that the axial distance between the points where a generator of t
41、he cone meets the opposite flanks of the thread groove is equal to half the basic pitch of the thread. 1.4.2 Major conean imaginary cone which just touches the crests of an external thread or the roots of an internal thread. 1.4.3 Minor conean imaginary cone which just touches the roots of an extern
42、al thread or the crests of an internal thread. 1.4.4 Gauge diameterthe basic major diameter of the taper thread, whether external or internal. 1.4.5 Gauge planethe plane perpendicular to the axis at which the major cone has the gauge diameter value. 1.4.6 Simple pitch diameter (pitch diameter)the di
43、ameter of the pitch cone in the gauge plane. 1.4.7 Major diameterthe diameter of the major cone in the gauge plane. 1.4.8 Minor diameterthe diameter of the minor cone in the gauge plane. 1.4.9 End face of external threada plane perpendicular to the axis at the small diameter end of the external tape
44、r thread. 1.4.10 End face of internal threada plane perpendicular to the axis at the large diameter end of the internal taper thread. 1.4.11 Gauge lengththe axial distance from the gauge plane to the end face of a taper thread. 1.4.12 Full thread (complete thread) the part of the thread which is ful
45、ly formed at both crest and root. 1.4.13 Incomplete thread (truncated thread)the part of the thread which is fully formed at the root but truncated (in excess of usual profile truncation) at the crests. *In course of preparation. COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS
46、1772, Part 119756 1.4.14 Runoutthread (washout thread) (vanish thread)the part of the thread which is not fully formed at the roots. 1.4.15 Useful threadthis comprises the complete thread and incomplete threads, but excludes the runout threads. 1.4.16 Total threadthis comprises the useful and runout
47、 threads. 1.4.17 Vanish conean imaginary cone the surface of which would pass through the roots of the runout thread. 1.4.18 Fitting allowancethe length of useful thread on that side of the gauge plane remote from the end face of an external taper thread. NOTE: The value of fitting allowance is equa
48、l to the difference between the length of useful thread and the gauge length. 1.4.19 Wrenching allowancethat part of the useful thread length of an externally taper threaded component which is provided to accommodate the relative movement between the externally and internally threaded parts when wre
49、nching beyond the position of hand-tight engagement. NOTE: The wrenching allowance is equal to the difference between the fitting allowance and the positive tolerance on the position of the gauge plane relative to the end face of the internal thread. COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 7AS 1772, Part 11975 Fig. 1(b) Series RC LEGEND DGGauge diameterLU Length of useful thread LGGauge lengthLW Length of washout thread LFLength of completeTLGTolerance on gauge (full) threadlength LTLength of incomplete (truncated) t