Orifice flowmeter installation precautions: 1. Pipeline conditions: (1) Straight pipe sections before and after the throttle element must be straight and must not be visible to the naked eye. (2) The straight pipe section of the device throttle should be lubricated. If it is not lubricated, the flow coefficient should be multiplied by the roughness correction sparse. (3) In order to ensure that the fluid activity is spread in the 1D front of the throttle to form a sufficient turbulent velocity, and this is spread into an average axisymmetric shape, 1) The straight pipe section must be round, and for the front 2D range of the throttle, its roundness is required to be severe and has a certain roundness goal. Detailed trade-offs: (A) On the OD, D/2, D, 2D 4 vertical pipe sections of the throttle, measure the inner diameter of the four pipes at most equal to each other at an equal angular interval, and take a uniform value D. The difference between the measured value and the uniform value of the free inner diameter shall not exceed ±0.3%. (B) After the throttle, in the OD and 2D position, 8 internal diameter single measurements are measured by the above method, and the single measured value is compared with D, and the zui* large deviation must not exceed ±2%. 2) Before and after the throttle, a straight pipe section of sufficient length is required. The length of the straight pipe section and the part of the resistance part before the throttle are related to the diameter ratio β, see Table 1 (β=d/D, d is Orifice opening diameter, 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 throttle member may be in the form of the second resistance member and β = 0.7 (regardless of the practice β value), which is listed in Table 1. 1/2 of the value (5) When the downstream side of the throttle piece is a closed space or a large container with a diameter ≥ 2D, the closed pipe length between the closed space or the large container and the throttle piece shall not be less than 30D (15D) if the throttle piece and the closed space or large When there are other partial resistance members between the containers, except between the throttle member and the partial resistance member, the length of the zui* small straight pipe length on the table 1 is attached, from the closed space to the throttle member. The total length of the straight pipe section shall not be less than 30D (15D). Zui* small straight pipe length on the upstream and downstream side of the throttle piece Table 1 The throttle part on the downstream side of the throttle piece and the length of the Zui* small straight pipe section L Note: 1. The above table is only for standard throttling installation. For special throttling installation, it is available for reference. 2. The number of columns is a multiple of the inner diameter D of the tube. 3. The number outside the parentheses in the above table is the value of “additional absolute limit error is zeroâ€, and the number in parentheses is the value of “additional absolute limit error is ±0.5%â€. That is, when there is a value in the brackets in the length of the straight pipe, the limit absolute error Ï„Q/Q of the flow measurement. The arithmetic should be added by 0.5%, which is (Ï„Q/Q+0.5)%. 4. If the length of the straight pipe is more than the value in parentheses and less than the value outside the brackets, it should be disposed according to the “additional limit absolute error of 0.5%â€. (1) The DC component device shall be in the pipeline, and its front end surface shall be perpendicular to the pipe axis, and the allowable zui* large non-perpendicularity shall not exceed ±1°. (2) After the throttle device is installed in the pipeline, its opening must be concentric with the pipeline, and the allowable zui* large misalignment ε shall not exceed the following formula to calculate the consequence: ε ≤ 0.015D (1/β-1). (3) All gaskets can not use too thick data, zui* does not exceed 0.5mm, the gasket can not protrude inside the pipe wall or it can cause a large measurement error. (4) Where the valve for regulating the flow rate is to be installed outside the length of the small section of the zui after the throttle (5) Throttling devices installed on the process piping must be stopped after the pipe cleaning purge. (6) The pressure-receiving method for the throttling installation of the degree or inclined pipe device. german car stainless steel manifold flange,german car stainless steel manifold for sale,german car stainless steel manifold exhaust Ningbo Lingmai Machinery Manufacturing Co., Ltd. , https://www.lingmaimfg.com
Oral flowmeter installation precautions
The orifice flowmeter is a high-range differential pressure flow device that combines a standard orifice plate with a multi-parameter differential pressure transmitter (or differential pressure transmission, temperature transmitter and pressure transmitter) to measure gas and steam. , liquid and natural gas flow. The orifice flow meter throttling device includes a ring chamber orifice plate, a nozzle, and the like. The throttling device (orifice flowmeter) integrates flow, temperature and pressure detection functions, has strong functions, compact structure, simple operation and convenient use. The orifice flowmeter throttling device produced by Sichuan Huikeda Instrument is used with the differential pressure transmitter to measure the flow of liquid, steam and gas. The orifice flowmeter is widely used in petroleum, chemical, “gold, electricity, lightâ€. Industry and other industries.