Etsy may send you communications; you may change your preferences in your account settings. The direction of the flow is immaterial except when a foreign substance such as sediment or vapor is carried in suspension. Gently push on the wire while rotating the cork until the wire comes through the other end of the cork. Jeannine Glaves lives in Oklahoma and feels she can neither have too many tools nor too much fiber. Follow the recommendations regarding elimination of flow disturbances, and the general layout and piping data. On the other hand, long lines require greater support, take up more space, require more materials and have a higher risk of leakage. The Pressure Transmitter should be installed at a higher position than the orifice plate. Yes, I have small folding pliers in my traveling tool kit. In this case it is preferable to install the primary element in vertical section of the line with the flow in such a direction that the foreign substance will readly carry on trough the primary element, i.
As discussed in flow instrumentation: principles and formulas , when there is a flow restriction in a pipe, a differential pressure results which can then be related to the volumetric flow rate through the restriction. The principle of a flow restriction creating a differential pressure is what is used in the orifice meter to measure the flow rate of liquids, steam and gases. The orifice flow meter consists basically of: a A primary device, the orifice plate that creates the flow restriction b A secondary device that measures the differential pressure created by the orifice plate. The orifice plate has a tab or printed label on one side where the specifications for the plate are stamped. The upstream side of the orifice plate usually has a sharp, square edge facing into the flow stream. Consider a typical orifice plate shown below:. A beta ratio of 0. With an orifice plate installed in a flow stream, increase in fluid flow velocity through the reduced area of the orifice develops a differential pressure across the orifice. The differential pressure generated is related to the beta ratio of the orifice plate. The smaller the beta ratio, the higher the differential pressure generated. In practice, the choice of beta ratio is a compromise between the differential pressure desired and the flow rate required. Shown below is a typical pressure profile of the Orifice plate:. As shown in the pressure profile above, with the orifice plate in the pipe work in between flanges or an orifice fitting , the static pressure upstream the plate increases slightly due to back pressure effect and then decreases sharply as the flow passes the orifice. Flow downstream the orifice reaches a minimum at a point called the vena contracta where the velocity of the flow is at a maximum. Beyond the vena contracta, static pressure starts to recover but it never gets to the upstream value.
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