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API Spec 19V

Specification for Subsurface Barrier Valves and Related Equipment, First Edition (ISO 28781:2010 (Modified), Petroleum and natural gas industries–Drilling and production equipment-Subsurface barrier valves and related equipment)
standard by American Petroleum Institute, 05/01/2013

API Spec 12K

Specification for Indirect-Type Oil Field Heaters, Eighth Edition
standard by American Petroleum Institute, 10/01/2008

API RP 578

Material Verification Program for New and Existing Alloy Piping Systems, Third Edition
standard by American Petroleum Institute, 02/01/2018

API RP 1161

Recommended Practice for Pipeline Operator Qualification, Fourth Edition
standard by American Petroleum Institute, 02/01/2019

API RP 934-C

Materials and Fabrication of 1 1/4Cr-1/2 Mo Steel Heavy Wall Pressure Vessels for High-pressure Hydrogen Service Operating at or Below 825 Degrees F (440 Degrees C), Second Edition
standard by American Petroleum Institute, 02/01/2019