Installation method of pressure guiding tubes in differential pressure flowmeters
Thread Content
In regular construction, pressure guide pipes are always laid horizontally side by side; this is the first time I’ve seen them laid vertically like this. Will the laying method shown in the diagram affect the measurements due to differences in pipeline length? Everyone is welcome to discuss.
It has no impact; the vertical height from the pressure tapping point to the gauge is the same.
No impact. The height of the pressure guide tube to the transmitter refers to the vertical projection height from the pressure sampling point to the transmitter; any changes in the installation path do not affect this vertical projection height.
Why not take the pressure reading at a 45-degree angle downward?
This is the first time I’ve seen it connected this way – one flange connecting two pressure transduction tubes?
Theoretically, it has no impact; as long as the horizontal heights of the two pressure tapping points are the same, there is no problem. When the medium is liquid, pressure measurement at the lower part is required. Do not take pressure measurements right at the bottom, as debris can easily get there. The impurities in the pipeline are carried along by the fluid; where is the connection point at the bottom? The correct location for taking pressure readings is at an angle of 45° to the horizontal below. The path from the pressure tap to the gauge head should maintain a downward slope; there should be no upward sections to prevent the accumulation of gas phase.
It is an integrated XX-type flow meter; there are no issues with the piping that could affect measurements. However, installing it directly below may lead to blockages caused by impurities in the pressure-taking area.
First time seeing pressure measurement right below
It should be similar to a Weiba-type flow meter, with a double-sided pressure tapping tube inside the flange.
The GB50093-2013 standard specifies this. This installation method does not meet the requirements. However, the length of the pressure tap tube does not affect the measurement; it seems to be the gas flow rate, and the direction in which the pressure is taken is incorrect.