Standard orifice flow meter installation matters

Abstract: Information on installation of standard orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers. 1. Pipeline conditions: (1) The straight pipe section before and after the throttle must be straight, and there should be no visible bending. (2) The straight pipe section used to install the throttling must be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness to correct the sparseness. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the installation of standard orifice flowmeters. 1. Pipeline conditions: (1) The straight pipe section before and after the throttle must be straight, and there must be no visible bending. (2) The straight pipe section used to install the throttling must be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness to correct the sparseness. (3) In order to ensure that the flow of the fluid forms a fully developed turbulent velocity distribution 1D before the throttling member, and make this distribution a uniform axisymmetric shape, so 1) the straight pipe section must be round, and the throttling must be round. The range of 2D before the piece, its roundness requirements are very strict, and there is a certain roundness index. Specific measurement method: (A) On the OD, D/2, D, 2D 4 vertical pipe sections before the throttling piece, measure at least 4 single measurement values ​​of the inner diameter of the pipe with a large to equal angular distance, and take the average value D. The difference between the single measured value of any inner diameter and the average value shall not exceed±0.3% (B) After the throttling piece, use the above method to measure 8 single measurement values ​​of inner diameter at the OD and 2D positions. Comparing any single measurement value with D, the maximum deviation shall not exceed±2% 2) A long enough straight pipe section is required before and after the throttling piece. This long enough straight pipe section is related to the form of the local resistance piece before the throttling piece and the diameter ratioβFor related, see Table 1 (β=d/D, d is the opening diameter of the orifice plate, and D is the inner diameter of the pipe). (4) The length of the straight pipe section between the first resistance member and the second resistance member on the upstream side of the throttling member can be in the form of the second resistance member andβ=0.7 (regardless of the actualβWhat is the value) Take 1/2 of the value listed in Table 1 (5) The upstream side of the throttle is the open space or diameter≥In the case of a 2D large container, the straight pipe length between the open space or the large container and the throttle shall not be less than 30D (15D). If there are other local resistance parts between the throttle and the open space or the large container, the In addition to the minimum straight pipe length 1 specified in Table 1, the total length of the straight pipe from the open space to the throttling element shall not be less than 30D (15D). The minimum straight pipe section length on the upstream and downstream sides of the throttling piece Table 1 The form of the local female part on the upstream side of the throttling piece and the minimum straight pipe section length L For reference 2. The number of columns is a multiple of the inner diameter D of the tube. 3. The numbers outside the parentheses in the above table are“Additional relative limit error is zero”, the numbers in parentheses are“The additional relative limit error is±0.5%”value of . That is, when there is a value in parentheses in the length of the straight pipe, the limit relative error τQ/Q of flow measurement. It should be arithmetically added by 0.5%, that is (τQ/Q+0.5)%“Additional limit relative error of 0.5%”deal with. (1) The straight-through part is installed in the pipeline, its front end must be perpendicular to the axis of the pipeline, and the maximum allowable non-perpendicularity shall not exceed±1°. (2) After the throttling piece is installed in the pipeline, its opening must be concentric with the pipeline, and the maximum allowable misalignment ε shall not exceed the calculation result of the following formula: ε≤0.015D (1/β-1). (3) All gaskets should not be made of too thick materials, no more than 0.5mm, and the gaskets should not protrude into the pipe wall, otherwise it may cause a large measurement error. (4) Any valve used to adjust the flow should be installed beyond the minimum length of the pipe section after the throttling piece. (5) The installation of the throttling device on the process pipeline must be carried out after the pipeline is cleaned and purged. (6) The pressure taking method of the throttling device installed in the horizontal or inclined pipeline. 1) When the fluid to be tested is liquid, in order to prevent air bubbles from entering the process pipeline and entering the jaw, the pressure-receiving buckle should be located at the centerline of the process pipeline.≤45°The position of the positive and negative is takenααα1 The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our manufacturer. 'Standard Orifice Flow Meter Installation Matters'

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