How to install the orifice flowmeter: I will introduce it in detail below, and see if the user communicates with the manufacturer’s technicians before installation.(1) The straight pipe sections before and after the throttle must be straight, and no visible bending is allowed.(2) The straight pipe section used to install the throttling component should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness to correct the sparsity.(3) In order to ensure that the fluid flow will form a fully developed turbulent velocity distribution one day before the throttling element, and make this distribution uniform and axisymmetric, 1) the straight pipe section must be circular, the circle of the first two days of the throttling element The degree is very strict, and there is a certain roundness index.Specific measurement method:(a) On the four vertical pipe sections od, D/2, D, and 2D before the orifice, measure the inner diameter of at least four pipes at the same angular distance for a single measurement, and take the average value D. The difference between the measured value and the average value shall not exceed 0.3%.(b) After the throttling element, use the above method to measure 8 individual inner diameter measurements at the outer diameter and 2D position, and the maximum deviation of any single measured value from D shall not exceed 2%.2) Sufficient straight pipe sections are required before and after the throttle element, which is related to the local resistance form and the diameter ratio before the throttle element.(4) The straight pipe length between the first resistance and the second resistance on the upstream side of the throttling element, according to the form of the second resistance element, = 0.7 (regardless of the actual value), which can be 1/2 of the listed value.(5) When the upstream side of the throttling element is an open space or a large container with a diameter of 2D, the open space or the length of the straight pipe between the large container and the throttling element shall not be less than 30D (15D).
Post time: 21-09-21