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API RP 621

Recommended Practice for Reconditioning of Metallic Gate, Globe, and Check Valves
standard by American Petroleum Institute, 03/01/2001

API RP 7HU1 Errata

Errata for Safe Use of 2-inch Hammer Unions for Oilfield Applications, First Edition
Amendment by American Petroleum Institute, 02/01/2014

API TR 1149

Pipeline Variable Uncertainties and Their Effects on Leak Detectability, Second Edition
standard by American Petroleum Institute, 09/01/2015