Select the installation of the pipe section of the test accuracy of a great influence, the selected pipe should avoid the interference and eddy current of these two kinds of measurement accuracy of the situation, the general selection of pipe should meet the following conditions:
1, to avoid the pump, high-power radio, frequency, that is a strong magnetic field and vibration interference at the installation of the machine;
2, select the pipe should be uniform and compact, easy to ultrasonic transmission of the pipe;
3, there should be long enough straight pipe, the upstream point of the installation point must be greater than 10D (Note: D = diameter), the downstream should be greater than 5D;
4, the installation point upstream from the water pump should be 30D distance;
5, the fluid should be filled with pipes;
6, there should be enough space around the pipe to facilitate on-site personnel operations, the underground pipeline to be tested wells
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