What are the differences between welded orifice flowmeter | vortex flowmeter and orifice flowmeter when measuring steam?

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What are the installation requirements for orifice flow meters? Hello! As a flowmeter manufacturer, I think it is necessary to help you answer the first question: 1. What are the requirements for the straight pipe section? To ensure that the fluid flow forms a fully developed turbulent dust velocity distribution 1D in front of the throttling element, and to make this distribution uniformly axisymmetric, the straight pipe section must be circular, and the roundness requirements for the 2D range in front of the throttling element are very strict, with certain roundness indicators. Specific measurement method: (A) Measure the inner diameters of at least four pipes on four vertical pipe sections, OD, D/2, D, and 2D, at equal angular distances, and take the average value D. The difference between any single inner diameter measurement value and the average value shall not exceed ± 0. 3% (B) After the throttling element, 8 single inner diameter measurements were taken at the OD and 2D positions using the above method. The maximum deviation between any single measurement and D should not exceed ± 2%. 2) A sufficiently long straight pipe section is required before and after the throttling element, which is related to the form of the local resistance element in front of the throttling element and the diameter ratio β. Generally, the longer the better, 5DN-10DN

2. Requirements for the sampling tube? I think the sampling tube you mentioned should refer to the pressure tube. It is generally recommended that the closed wheel should not be too thick, and there is not much requirement for the minimum diameter of the pressure tube. Generally, the optimal principle is not to block it, and the overall pressure tube should not be

too long. 3. Regarding the flow direction of the pipeline medium? Generally, the right angle surface of the throttle element of the Jiaobu Xin orifice flowmeter is used for upstream installation, and the one with a 45 degree groove is used for downstream installation. If the installation is reversed, it will cause measurement errors. Is it allowed to flow downwards? The answer is that it is not allowed to flow downwards because it will cause dissatisfaction with the pipe (orifice flow meters also belong to velocity flow meters and must be filled with pipes). Regarding the standard you mentioned last, it can be easily found on the standard sharing website. I am the flow meter technology of Weifang Yafeng Chemical Instrument, and I hope you can accept it!

2. What are the differences between vortex flowmeter and orifice flowmeter?

There is still a big difference between vortex opening street flowmeter and orifice flowmeter, such as: accuracy comparison: the early position flowmeter in the orifice plate strictly calculates the flow according to the national standard calculation formula. If it is a heating station with strict requirements, it is recommended to use an orifice flowmeter.. The vortex flowmeter uses a simplified calculation formula to calculate the flow rate, but the accuracy is relatively inferior. Pressure loss: Orifice flow meters belong to throttling devices and have greater pressure loss than vortex flow meters. Maintenance cost: Orifice flow meters require many accessories and welding, which requires strict requirements for welders. In addition, due to the large number of sealing welding points, blockages are prone to occur; The vortex flowmeter only has requirements for flange welding

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