Use and installation of orifice flowmeter

As for the orifice flowmeter, it is now an indispensable equipment for every coal mine, big or small. Do you know how to use and install this product?

Use of orifice flowmeter:

The orifice flowmeter is used to measure the gas flow in the gas extraction pipeline. When the gas passes through the orifice plate through the pipeline, the flow rate will increase, and a pressure difference will be generated on both sides of the orifice plate. There is a constant relationship between the flow rate and the pressure difference. The flow rate of the gas in the pipeline can be calculated by the pressure difference.

Orifice flow meter installation:

1. The orifice flowmeter consists of an orifice plate, a pressure nozzle and a steel pipe. During the installation process, attention should be paid to the installation direction of the orifice plate, as shown in the figure.

2. Orifice plate installation requirements

(1) The length of the measuring tube on the upstream side of the orifice plate is 10D, and the length on the downstream side is 4D.

(2) The surface of the measuring tube must be clean, free of depressions and sediments, and the relative roughness must be K/D.

Should be less than or equal to 0.001.

(3) The required straight pipe length upstream and downstream of the orifice plate shall not be less than the following requirements:

(4) The roughness K/D of the inner surface of the straight pipe section outside the measuring pipe length is less than or equal to 0.001.

(5) When installing the orifice plate in the measuring tube, the opening circumference is coaxial with the measuring tube axis, and the upstream end face of the orifice plate is perpendicular to the pipeline axis with a verticality of less than ±1%.