GB/Z 33902-2017

This standard provides guidelines for assessing and correcting measurement errors when fluid flow conditions deviate from the strict specifications of GB/T 2624, such as variations in pipe roughness, upstream disturbances, or fluid properties. It is applied in industrial flow measurement contexts where differential pressure devices (like orifice plates, nozzles, or Venturi tubes) are used, particularly in sectors like oil and gas, chemical processing, and water management. The standard helps engineers and technicians quantify uncertainty and apply correction factors to maintain accurate flow readings in real-world installations where ideal conditions cannot be fully met.