Precautions for installation of orifice flow meter

Abstract: Information on installation precautions for orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The orifice plate flowmeter is a high-range ratio differential pressure flow device composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmission, temperature transmitter and pressure transmitter), which can measure gas, steam , liquid and natural gas flow. Orifice flowmeter throttling device. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the installation precautions for orifice flowmeters. The orifice plate flowmeter is a high-range ratio differential pressure flow device composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmission, temperature transmitter and pressure transmitter), which can measure gas, steam , liquid and natural gas flow. Orifice flowmeter throttling device includes annular chamber orifice, nozzle, etc. The throttling device (orifice flowmeter) integrates the detection functions of flow, temperature and pressure, with strong functions, compact structure, simple operation and convenient use. The orifice flowmeter throttling device produced by Sichuan Huikeda Instrument is used in conjunction with the differential pressure transmitter to measure the flow of liquid, steam and gas. The orifice flowmeter is widely used in petroleum, chemical,”Gold, electric power, light industry and other industries. Precautions for installation of orifice flowmeter: 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 for the throttling part of the device should be lubricated. If it is not lubricated, the flow coefficient should be multiplied by the roughness to correct the sparseness. (3) In order to ensure that the movement of the fluid forms a well-developed turbulent velocity distribution 1D before the throttling member, and to make this distribution into an average axisymmetric shape, 1) the straight pipe section must be round, and the throttling must be round. In the front 2D range of the piece, the roundness requirement is very strict, and there is a certain roundness target. Detailed weighing method: (A) On the four vertical pipe sections of OD, D/2, D, and 2D in front of the throttling piece, at most 4 single measurement values ​​of the inner diameter of the pipe are measured at equal angular intervals, and the average value D is taken. The difference between the single measured value and the average value of any inner diameter shall not exceed±0.3% (B) After the throttling piece, 8 single measurement values ​​of inner diameter are measured by the above method at OD and 2D position, any single measurement value is compared with D, and its 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 method of some resistance pieces before the throttling piece and the diameter ratio.βFor details, 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 downstream side of the throttling member can be adjusted in the manner of the second resistance member andβ=0.7 (regardless of practiceβWhat is the value) Take 1/2 of the value listed in Table 1 (5) The downstream side of the throttle is the closed space or diameter≥In the case of a 2D large container, the length of the straight pipe between the closed space or the large container and the throttle shall not be less than 30D (15D). If there are other resistance parts between the throttle and the closed space or the large container, the In addition to the minimum straight pipe length 1 according to the rules in Table 1, the total length of the straight pipe from the closed space to the throttle should not be less than 30D (15D). The minimum straight pipe section length on the upstream and downstream sides of the throttle piece is listed in Table 1. Part of the female part on the downstream side of the throttle piece and the minimum straight pipe section length L Note: 1. The above table is only for standard throttle installation, and for special Throttling installation for reference 2. The number of columns is a multiple of the inner diameter D of the pipe. 3. The numbers outside the parentheses in the above table are“Additional absolute limit error is zero”, the numbers in parentheses are“The additional absolute limit error is±0.5%”value of . That is, when there is a value in parentheses in the length of the straight pipe section, the limit absolute error τQ/Q of the flow measurement. It should be added arithmetically by 0.5%, that is, (τQ/Q+0.5)% 4. If the actual length of the straight pipe section is greater than the value in the brackets, but less than the value outside the brackets, you need to press“The additional limit absolute error is 0.5%”dispose of. (1) The straight-through component is installed in the pipeline, and 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 use too thick material, preferably no more than 0.5mm, the gasket should not protrude into the pipe wall, otherwise it may cause a large measurement error. (4) Any valve used for regulating flow should be installed beyond the minimum pipe length behind the throttling piece. (5) The throttling device installed on the process pipeline must be stopped after the pipeline is cleaned and purged. (6) The pressure taking method of the throttling installation of the horizontal or inclined piping device. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Installation Precautions for Orifice Flow Meter'

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