Orifice Plates and Venturi Tubes, 2,015th Edition by Michael Reader-Harris:
This book gives the background to differential-pressure flow measurement and goes through the requirements explaining the reason for them. For those who want to use an orifice plate or a Venturi tube the standard ISO 5167 and its associated Technical Reports give the instructions required. However, they rarely tell the users why they
Orifice Plates and Venturi Tubes, 2,015th Edition by Michael Reader-Harris.pdf