The correct way to install and select the orifice flow meter

Abstract: The information on the correct installation and selection of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Orifice flowmeter is a throttling device that is a differential pressure sensing element that measures flow. Combined with differential pressure transmitters and actual, recording, accumulating and adjusting instruments, it can be used to measure, accumulate and control the instantaneous flow and cumulative flow of liquid, steam and gas. Throttling device. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the correct installation and selection of orifice flowmeters. The orifice flowmeter is a throttling device and a differential pressure sensing element that measures flow. Combined with differential pressure transmitters and actual, recording, accumulating and adjusting instruments, it can be used to measure, accumulate and control the instantaneous flow and cumulative flow of liquid, steam and gas. The throttling device has the advantages of simple structure, convenient installation, reliable use, low price, convenient maintenance, and a wide selection range (the diameter of the standard throttling device can be measured from 50mm to 1200mm, and the diameter of the non-standard throttling device can also be as small as 6mm. up to 3000mm; measuring temperature up to 555°C; pressure resistance up to 42MPa), and the standard throttling device also has the advantages of no need for separate calibration. It is the most widely used and mature product in flow instruments, so it is widely used in Electric power, chemical industry, metallurgy, petroleum, textile, military and other fields. The throttling device is composed of throttling parts, pressure-taking devices (including pressure-taking ports, pressure-inducing pipes and valves, etc.), supporting flanges, and sometimes includes front and rear straight pipe sections that meet the standards. Standard throttling devices include standard orifice plate, standard nozzle, and standard venturi. Standard orifice plate is divided into angle connection (annular chamber or drill hole) according to the pressure taking method, flange pressure taking, radial pressure taking; standard nozzle is divided into nozzle and long diameter nozzle according to form; standard Venturi tube is divided into Venturi according to form Nozzles, Venturi tubes (rough cast or machined or coiled). Non-standard throttling devices include small-diameter orifice plate, 1/4 round orifice plate, round orifice plate, round orifice plate, eccentric orifice plate, double orifice plate, built-in orifice plate, conical inlet orifice plate, etc. Other forms of throttling devices include pitot tubes, uniform velocity tubes, wedges, cones, and the like. When using a standard throttling device, the properties and states of the fluid must meet the following conditions: (1) the fluid must fill the pipe and the throttling device, and flow through the pipe continuously; (2) the fluid flow rate does not change with time or changes very slowly; ( 3) No intersection occurs when the fluid flows through the throttle; (4) The fluid must be a Newtonian fluid, that is, it is physically and thermodynamically homogeneous, single-phase, or can be considered to be single-phase, including mixed gases, solutions And the disperse particle is less than o. 1 m of colloid. There are no more than 2% (mass composition) uniformly dispersed solid particles in the gas, or no more than 5% (volume composition) uniformly dispersed bubbles in the liquid, which can also be considered as single-phase fluids, but the density should take the average density. ; (5) Before the fluid flows through the throttling member, the flow beam is a non-swirl flow parallel to the axis of the pipeline. Standard throttling devices are not suitable for flow measurement of dynamic and critical flows. The throttling device artificially causes throttling in the pipeline where the medium flows. When the measured medium flows through the throttling device, it causes a local contraction, the flow beam is concentrated, the flow velocity increases, and the static pressure decreases, so the upstream and downstream of the throttling piece A static pressure difference is created on both sides. There is a certain functional relationship between the static pressure difference and the flow rate. The greater the flow rate, the greater the static pressure difference generated. Therefore, the flow rate can be measured by measuring the differential pressure. The difference between the orifice flowmeter and other flowmeters is that the orifice flowmeter is designed according to the parameters of the drawing, and finally processed and produced, and only the material of the orifice plate is selected according to the measuring medium. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to correctly install and select the orifice flow meter'

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