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Title: Orifice Fittings And Meter Tubes
Author: Ray Forbes
Source: 1981 International School of Hydrocarbon Measurement
Year Published: 1981
Abstract: THROUGHOUT THE MEASUREMENT INDUSTRY, THE TERM PRIMARY ELEMENT GENERALLY REFERS TO THE ORIFICE PLATE, THE ORIFICE PLATE HOLDING DEVICE, AND THE ADJACENT PIPING OR METER TUBE. THE SINGLE MOST IMPORTANT ITEM OF THE PRIMARY DEVICE IS THE ORIFICE PLATE, SINCE IT IS THE ORIFICE PLATE WHICH CREATESS THE DIFFERENTIAL PRESSURE WITHIN A FLOWING MEDIUM. THE MEASUREMENT OF A PRESSURE DIFFERENTIAL, ALONG WITH CERTAIN OTHER DATA, PERMITS ONE TO COMPUTE THE RATE OF FLOW ON THE BASIS OF WELL ESTABLISHED PHYSICAL PRINCIPLES. FREQUENT INSPECTION OF THE ORIFICE PLATE IS NECESSARY IN SOME TYPES OF SERVICE TO INSURE THAT IT IS IN PROPER CONDITION TO METER ACCURATELY, I.E., IT IS FLAT AND CLEAN AND THE INLET EDGE OF THE ORIFICE BORE IS STILL SHARP, SQUARE AND FREE FROM NICKS OR OTHER DAMAGE.

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