| http://www.w3.org/ns/prov#value | - Revised every few years, standards are used to ensure interchangeability of components such as valves, bolts, screws and nuts, flanges, fittings, piping, welding and threads.Organizations developing standards include ASME, API, ISO, NACE and MSS and the standards cover everything from types of valves required for specific processes to materials to wall thicknesses, pressure/temperature ratings and
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