In no case shall a coupling or half coupling have a rating less than Class 2000 per ASME B16.11. The minimum wall thickness of the coupling anywhere in the reinforcement zone (if threads are in the zone, wall thickness is measured from root of thread to minimum outside diameter) shall be not less than that of the unthreaded branch pipe. 328.5.4, provided the size of the branch does not exceed DN 50 (NPS 2) nor one-fourth the nominal size of the run. (b) the branch connection is made by welding a threaded or socket welding coupling or half coupling directly to the run in accordance with para. (a) the branch connection utilizes a listed fitting in accordance with para. It may be assumed without calculation that a branch connection has adequate strength to sustain the internal and external pressure which will be applied to it if There are, however, certain branch connections which have adequate pressure strength or reinforcement as constructed. The amount of reinforcement required to sustain the pressure shall be determined in accordance with para. A pipe having a branch connection is weakened by the opening that must be made in it and, unless the wall thickness of the pipe is sufficiently in excess of that required to sustain the pressure, it is necessary to provide added reinforcement. Below is Para 304.3.2 quoted from B31.3-ģ04.3.2 Strength of Branch Connections.
How to calculate reinforcement pad dimensions code#
At these places, the design of branch connection shall be according to guideline provide by the respective piping code para 304.3. Still at some places either standard size fittings are not available or too costly to put in the line.
Standard fittings like a tee, weldolet, sockolet, half couplings are generally used when there is a need to take branch out from header.
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