A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Yield Strength The limiting stress beyond which a material will sustain permanent deformation. Up to the yield strength the material will spring back to its original dimension when the applied stress is removed. Once the yield point is passed, some amount of the deformation will be irreversible. Yoke That part of a gate valve … Read more
A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y X-Ray An X-ray, NDE Procedure for locating flaws in welds, forgings, castings and fabricated parts. Techniques and procedures are covered in ASME V, Art. 2.
A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Wall Thickness The thickness of the wall of a pressure vessel or of a pipe. Water Hammer The physical effect often accompanied by loud banging produced by pressure waves generated within the piping by rapid change of velocity in a liquid system. WE (Weld End) The end connection of a valve which is to … Read more
A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Valve A device which controls or isolates the flow of a liquid or gas in a conduit or pipeline. Variable Orifice A small variable profile valve put in a flow line and used with a pilot to restrict the flow into the pilot and make the pilot more or less sensitive to changing conditions. … Read more
A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Ultrasonic Test A non-destructive inspection procedure using high frequency sound waves to detect voids and imperfections throughout the thickness of metal parts. Techniques and procedures are covered in ASME V, Art. 4, Art. 5, and ASTM A388, A435 and A577. Unidirectional Valve Valve designed for blocking the flow in one direction only. Union Connection … Read more
A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Tee Piece A pipe or tubing fitting with a side outlet at right angles. Resembles a T. Tensile Strength The maximum amount of tensile stress (ultimate strength) that a material can withstand before failure or rupture occurs. It is the maximum stress developed in a material in a Tensile Test. Tensile Test A test … Read more