API MPMS Chapter 14.3 Part 2 (R2011)
Natural Gas Fluids Measurement: Concentric, Square-Edged Orifice Meters - Part 2: Specification and Installation Requirements
Handbook / Manual / Guide by American Petroleum Institute, 04/30/2000
API RP 520
Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries: Part I - Sizing and Selection
standard by American Petroleum Institute, 01/01/2000