Recently I was asked if “torquing” threaded pipe is required by code. I answered the inquiry by referring the client to ASME B1.20.1-2013, which states:
1.4 Sealing (NPT and NPSC Only)
…
1.4.3 Tightening Torque.
Due to application-specific variables such as materials, wall thickness, operating pressures, etc., no guidance is given in this Standard regarding joint-tightening torque. However, joints should be tightened beyond the hand-tight engagement position. Advancing the joint past hand-tight creates interference between external and internal thread flanks, produces a seal (with the use of a sealant), and helps prevent loosening of the joint. Overtightening may be detrimental to the sealing function of the joint.
However, ASME B31.3 offers the following regarding Threaded Flangers when used in “Normal Fluid Service”. Refer to Section 308.2.3…
(emphasis by me)