Orifice Fitting Plate & Flange
Orifice Fittings Plates & Flanges have many uses for example, power generation, oil production and refining, water treatment an distribution, gas processing and transmission, chemical and petrochemical industry. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. First, the fluid passes through the orifice then the pressure builds up slightly upstream of the orifice. Then, the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases. When the flow expands, the velocity falls, and the pressure increases. The pressure difference generated by the flow velocity through the hole enables the flow quantity to be measured. Orifice plates are mainly used to achieve restricted or controlled flow of a process fluid. Therefore, the smaller the beta ratio, the higher the differential pressure generated.
In working practice, the selected beta ratio is a generally compromise between the flow rate required and the desired differential pressure. It is easy to measure this decrease in pressure which can be used to determine the flow rate. Energy losses across an orifice plate can be significant and it is therefore necessary to introduce a discharge coefficient which is equal to the ratio of actual flow rate to the flow rate with no energy losses or theoretical flow rate. An orifice plate has the advantage of being inexpensive and simple to use but high-pressure losses are sustained.
Orifice flanges are for metering the volumetric flow rate of liquid and gasses through a pipe. Each flange comes with two pipe taps for measuring the pressure drop of the flow through an orifice plate. Orifice Flanges are used with orifice meters to measure the flow rate of either liquids or gases in the pipeline. They are also used with orifice meters for the purpose of measuring the flow rate of either liquids or gases in the respective pipeline. Orifice flanges usually come with either raised faces or ring type joint facings. Therefore, they are essentially the same as weld neck and slip-on flanges with extra machining.