Section 112.63 - Threaded Joints(1) Threaded joints shall be free of stress from external loading.(2) All threaded joints, except those requiring removal for regular maintenance, such as relief valve connections, shall be seal-welded or sealed by other means that have been tested and proven reliable and acceptable in industry practice.(3) Threaded pipe and fittings installed after September 14, 1990, and used in cryogenic or hazardous fluid piping shall be designated as at least extra-strong (Schedule 80).Amended by Mass Register Issue 1432, eff. 12/11/2020.