ISO/TC 5/SC 5 - Threaded fittings, solder fittings, welding fittings, pipe threads, thread gauges
Raccords filetés, raccords à braser, raccords à souder, filetages de tubes, calibres de filetage
General Information
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ISO 4144:2003 specifies the types, pressure-temperature ratings, minimum dimensions and materials of stainless steel fittings for threaded connections in accordance with ISO 7-1, used for ordinary piping for steam, air, gas, water, oil, etc.
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This part of ISO 7 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal threads on piping systems components and other products, the dimensions and tolerances of which are detailed in ISO 7-1. The gauging system described may not be suitable, without special precautions, for gauging of threads on injection moulded plastic workpieces. This part of ISO 7 does not cover completely all the requirements necessary for full control of thread quality and dimensions. Additional control of tools and equipment and visual inspection during production are required to ensure complete compliance with ISO 7-1, for example the length of useful thread on internally threaded workpieces should be checked by direct measurement. Annex A gives a summary of the gauges included in this part of ISO 7, together with details of the thread elements controlled by each gauge and gauge identification numbers. In the event of a dispute over compliance with the requirements of ISO 7-1, the gauges in this part of ISO 7 are to be considered as decisive for the thread elements which they control on the workpiece.
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This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads, intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc. These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies with such threads must be made pressure-tight, this should be effected by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal. NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see ISO 7-1. NOTE 2 ISO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recommended gauging systems.
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Replaces the first line in subclause 5.3 and replaces subclause 11.7 by a new wording.
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Specifies requirements for the design and performance of the fittings, being for general purposes for the transmission of fluids and gases up to the limits of pressure and temperature specified. They are intended for the connection of elements threaded in accordance with ISO 7/1, sizes 1/8 to 6. For use in conditions outside the pressure and temperature limits specified, consult the fitting manufacturer.
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Specified the designation and lays down the dimensions and tolerances of pipe threads. Gives terms and definition as well as symbols and explanations including examples of the complete designation for a thread. Figures 1 to 4 illustrate details. Tabulates thread dimensions from 1/16 up to and including 6 inch.
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This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.
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Specifies requirements for fittings for threaded connections, used mainly for industrial purposes. Table 1 contains diagrams of types of fittings and their symbols. Tabulates the fitting dimensions (tables 2, 5, 9 to 12) with nominal sizes from DN 6 up to and including DN 100 (thread designation 1/8 to 4). Table 6 contains sockets (DN 6 to DN 150), reducing fittings are included in the tables 3, 7 and 8 (DN 8 DN 100 and DN 6 to DN 80 resp.), table 4 comprises elbows (DN 8 to DN 50).
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This edition cacels and replaces the ISO Recommendation R 2016 - 1971. Specifies the field of application, the assembly dimensions and their tolerances, the materials and tests for fittings. The assembly diameters ranging from 6 mm up to and including 108 mm. Comprises GO and NOT GO plug gauges (table5), and GO and NOT GO ring gouges (table 6).
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This second edition cancels and replaces the first edition (1975). Specifies the dimensions, tolerances and generally used grades of non-alloy, low alloy and alloy steels for bends /type 2D (90 and 180 ) and 3D (45 , 90 and 180 )/, concentric and eccentric reducers, tees, caps and ends with quality requirements as used for piping work.
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Specifies rhe dimensions, tolerances and generally used grades of stainless steel for bends /type 3D (90 and 180 ) with and without straight ends and type 5D (90 )/, concentric and eccentric reducers, tees, caps and stub ends with quality requirements as used for piping work.
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Specifies requirements for fittings for threaded connections, used mainly for industrial purposes. Table 1 contains diagrams ot types of fittings and their symbols. Tabulates the fitting dimensions (tables 2 to 10) with nominal sizes from DN 6 up to and including DN 80 (thread designation 1/8 to 3).
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