Turbine flow meter installation piping requirements

The uneven distribution of flow velocity and the presence of secondary flow in the tube are important factors affecting the measurement accuracy of the turbine flowmeter. Therefore, turbine flowmeters have certain requirements for upstream and downstream straight pipe sections. For industrial measurements, generally require 20D upstream and 5D downstream straight pipe length. To eliminate the secondary flow, it is best to install a rectifier on the upstream side. If the upstream end can guarantee a straight pipe section of about 20D, and install a rectifier, the measurement accuracy of the flowmeter can reach the accuracy level of the calibration.

Turbine flowmeters require high fluid cleanliness. Filters must be installed before the flowmeter to ensure fluid cleanliness. Filter can be used funnel type, its own cleanliness, can be measured at both ends of the differential pressure change.

In order to ensure that the liquid passing through the flowmeter is single-phase, that is, air or steam cannot be allowed to enter the flowmeter, an air eliminator should be installed upstream of the flowmeter when necessary. For the easy gasification liquid, a certain back pressure must be guaranteed downstream of the turbine flow meter. The back pressure may be twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the measured liquid vapor pressure at the highest temperature.