What are the requirements for installing the piping of Roots flowmeter?

1. Uneven velocity distribution and the presence of secondary flow in the pipe are important factors affecting the measurement accuracy of the turbine flowmeter. Therefore, the turbine flowmeter has certain requirements for the upstream and downstream straight pipe sections. For industrial measurement, the straight pipe length of 20D upstream and 5D downstream is generally required. In order to eliminate secondary flow, it is best to install a rectifier at the upstream end. If the upstream end can ensure a straight pipe section of about 20D and install a rectifier, the measurement accuracy of the flowmeter can reach the accuracy level during calibration.

2. The turbine flowmeter has high requirements for the cleanliness of the fluid. A filter must be installed in front of the flowmeter to ensure the cleanliness of the fluid. The filter can be funnel-shaped, and its own cleanliness can be measured by measuring the differential pressure change at both ends.

3. In order to ensure that the liquid passing through the flowmeter is single-phase, that is, air or steam cannot enter the flowmeter, a degasser should be installed upstream of the flowmeter if necessary. For liquids that are easily vaporized, a certain back pressure must be guaranteed downstream of the flowmeter. The size of the back pressure can be obtained by adding twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the vapor pressure of the measured liquid at the highest temperature.