This is a means of measuring the pressure drop caused by the velocity change of the gas as it passes through an engineered restriction within the pipe and as a result its flow path.
The most common instrument used in the measurement of natural gas flow rate. It is typically used because of the level of accuracy it delivers, the ruggedness, simplicity, ease of installation, and maintenance, range, capacity and low cost.
It is comprised of 2 major element:
- To produce the differential pressure
- To measure the pressure