EN 10226-3; Pipe Threads where Pressure Tight Joints are made on the Threads - Part 3: Verification by means of Limit Gauges
EN 10226-3 Foreword
ISO 10226-3 is based, with editorial modifications on ISO 7-2“Pipe threads where pressure-tight joints are made on the threads- Part 2: Verification by means of Limit Gauges”. Pipe thread gages defined by EN 10226-3 are dimensionally identical to and fully interchangeable with pipe threads to ISO 7-2.
EN 10226 has been prepared in three parts. Part 1 and Part 2 reflect the two thread joining systems in regular use in Europe and Worldwide. Part 1 details taper external and parallel internal pipe threads. Part 2 details taper external and taper internal pipe threads.
Part 3 details the requirements for the gauging of pipe threads conforming to Part 1 and Part 2.
EN 10226-2 Scope EN 10226-3 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal thread on piping system components and other products, the dimensions and tolerances of which are detailed in EN 10226-1, EN 10226-2 and ISO 7-1. In the event of a dispute over compliance with the requirements of EN 10226-1, EN 10226-2 and ISO 7-1, gages in EN 10226-3 and ISO 7-2 are to be considered as decisive for the thread elements which they control on the work piece.
The EN 10226-3 gauging system described may not be suitable, without special precautions, for gauging of threads on injection molded plastic work pieces.
EN 10226-3 does not cover completely all requirements 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 EN 10226-1, EN 10226-2 and ISO 7-1, for example the length of useful thread on internally threaded work pieces should be checked by direct measurement.
EN 10226-3 Annex A gives a summary of the gauges included in this document, together with details of the thread elements controlled by each gauge and gauge identification numbers.
EN 10226 Notes
Note 1: Threaded joints using taper external threads and parallel internal threads are detailed in EN 10226-1.
Note 2: The requirements for taper external threads are identical in EN 10226-1 and EN 10226-2. The common requirements for the taper external pipe thread are in Part 1 and in Part 2; so as to present the complete thread joining system in each part.
Note 3: For pipe threads where pressure-tight joints are not made on the threads see ISO 228-1.
Note 4: EN 10226-3 gives details of recommended gauging systems for the verification of thread dimensions and thread form. The gauging system defined in EN 10226-3 is technically equivalent to the gauging system defined in ISO 7-2.
Original Posting: 11/8/2012
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