EN 10226-1; Pipe Threads where Pressure Tight Joints are made on the Threads - Part 1: Taper External Threads and Parallel Internal Threads - Dimensions, Tolerances and Designation
EN 10226-1 Foreword
ISO 10226-1 is based, with editorial modifications on ISO 7-1“Pipe threads where pressure-tight joints are made on the threads- Part 1: Dimensions, tolerances and designation”. Pipe threads to EN 10226-1 are dimensionally identical to and fully interchangeable with pipe threads to ISO 7-1.
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.
Components having pipe threads produced to the dimensions and tolerances given in this standard can be assembled to give safe and effective pressure tight joints providing proper assembly techniques are used. The techniques used to assemble threaded joints are dependent on a number of factors including the internal thread (parallel or taper), the quality of the mating threads, the materials o the components being connected, the thread sealant or joining compound used and the assembly torque.
Because of the different assembly techniques used for the taper/parallel and taper/taper systems, it is recommended that mixing of components having parallel internal and taper internal threads is avoided in the same piping system.
Relevant EN product or application standards will normally specify whether parallel and/or taper internal threads are permitted for these products or applications. Users should select the internal thread type to suit their product or application requirements.
EN 10226-1 Scope EN 10226-1 specifies the requirements for the thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16” to 6” inclusive, for joints made pressure-tight by mating of the threads. These threads are taper external and parallel internal and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipment interconnected by threaded joints. An appropriate thread sealant of joining compound should be used on the thread to ensure pressure-tight joints.
EN 10226-1 Scope Notes Note 1: Threaded joints using taper external threads and taper internal threads are detailed in EN 10226-2.
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: 11/7/2012
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