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ISA 20-1981

Specification Forms for Process Measurement & Control Instruments, Primary Elements & Control Valves
standard by The International Society of Automation, 04/01/1981

ISA 12.02.02-2014

Recommendations for the Preparation, Content, and Organization of Intrinsic Safety Control Drawings
standard by The International Society of Automation, 09/08/2014

ISA TP-973012

Layer of Protection Analysis for Determining Safety Integrity Level
standard by The International Society of Automation, 01/01/1997

ISA 75.08.08-2015

Face-to-Centerline Dimensions for Flanged Globe-Style Angle Control Valve Bodies (Classes 150, 300, and 600)
standard by The International Society of Automation, 12/30/2015