GOST 8.563.3-1997 State system for ensuring the uniformity of measurements. Measurement of liquids and gases flow rate and quantity by differential pressure method. Procedure and module of calculations. Software
2005GOST 8.586.1-2005 State system for ensuring the uniformity of measurements. Measurements of liquids and gases flow rate and quantity by means of orifice instruments. Part 1. Principle of the method of measurements and general requirements
1997GOST 8.563.1-1997 State system for ensuring the uniformity of measurements. Measurement of liquids and gases flow rate and quantity by differential pressure method. Orifice plates, nozzles ISA 1932 and Venturi tubes inserted in circular cross-section filled conduits. Spec
1986GOST 26969-1986 Standard orifice plates for flowmeters. Specifications