Note: this section applies to velocity-equalizing tube class (
Cases of ITABAR, VBRABAR, ANUBA, etc. )
Flowmeter, than than hosting hosting flowmeter
and its deformation products such as V (
Flow meter and than type of venturi tube installation.
Table 6 velocity-equalizing tube flowmeter straight pipe upstream and downstream side required minimum 1, velocity-equalizing tube flowmeter should be installed on the full of measured medium pipeline.
2, velocity-equalizing tube flowmeter should be installed in horizontal pipe runs: when measuring gas and steam.
Can also be installed in vertical pipe runs.
3, velocity-equalizing tube flowmeter on cross section in the process piping of insert bearing shall meet the following requirements: a)
Installed in horizontal pipe runs, Zha gas, should be in above the horizon and horizontal Angle of 30 & deg;
Within the scope of;
Installed in horizontal pipe runs, measuring, liquid and steam should be connected with the horizontal Angle - below the horizontal line
~ - - - - - -
Within the scope of;
When installed in vertical pipe runs, but in a plane perpendicular to the center line of the pipeline in any position;
Velocity-equalizing tube flowmeter pressure hole hole centerline and pipeline centerline deviation should be less than 3 & deg;
Velocity-equalizing tube rod verticality deviation should be less than 5 centerline and the pipe & deg;
With the center line of the pipeline of deviation should be less than 3 & deg;
4, measurement accuracy requirement for & plusmn;
1%, the average tube flowmeter, downstream straight pipe length should comply with the requirements of table 6.
Measurement accuracy requirement for & plusmn;
3% when, should have at least 3 d, 2 d downstream upstream side of the straight pipe length.
5, velocity-equalizing tube flow meter
for measuring the two-phase flow and working temperature is lower than the saturation temperature of the steam flow measurement.
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