Pipe threads where pressure tight joints are made on the threads - Taper external threads and parallel internal threads. Dimensions, tolerances and designation not-eligible additional safety measures may be

additional safety measures may be necessary

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this part of BS ISO/IEC 29794:

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Pipe threads where pressure tight joints are made on the threads - Taper external threads and parallel internal threads. Dimensions, tolerances and designation not-eligible additional safety measures may beBS EN 10226 1: 2004 Pipe threads where pressure tight joints are made on the threads. Taper external threads and parallel internal threads. Dimensions, tolerances and designation BS EN 10226 1 specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1 16 to 6 inclusive. It applies to joints made pressure tight by means of mating of the threads. These threads are taper external and parallel