⟩ Explain is there any expiry date for WPS/PQR/WPQ/WOPQ?
NO.
WPS, PQR, WPQ/WOPQ made in accordance with the requirements of the 1962 edition or any later edition of section IX may be used in any construction built to the ASME Boiler and Pressure Vessel Code or the ASME B 31 Code for pressure piping.