GOST 8.586.4-2005
国家测量统一性保证体系.液体流量,气体流量及质量的孔板仪测量.第4部分:文丘里管.技术要求
State system for ensuring the uniformity of measurements. Measurements of liquids and gases flow rate and quantity by means of orifice instruments. Part 4. Venturi tubes. Technical requirements