GB/Z 35140-2017

This standard provides guidelines for specifying and using orifice plates, nozzles, and Venturi tubes in fluid flow measurement applications that fall outside the scope of GB/T 2624, such as non-standard pipe diameters, unusual Reynolds numbers, or extreme operating conditions. It is applied in industrial metrology contexts where engineers need to design or select differential pressure flow measurement devices for pipelines carrying liquids, gases, or steam under non-standard conditions. The standard ensures accuracy and consistency in flow measurement for sectors like oil and gas, chemical processing, and power generation when standard design rules do not apply.