Orifice Plates and Venturi Tubes by Michael Reader-Harris

By Michael Reader-Harris

This booklet provides the historical past to differential-pressure circulation dimension and is going during the standards explaining the cause of them. should you are looking to use an orifice plate or a Venturi tube the normal ISO 5167 and its linked Technical reviews supply the directions required. besides the fact that, they infrequently inform the clients why they need to stick with yes directions. This ebook is helping clients of the ISO criteria for orifice plates and Venturi tubes to appreciate the explanations why the factors are as they're, to use them successfully, and to appreciate the implications of deviations from the standards.

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To carry out the calculation the material of the plate, the thickness and how it is supported at the outside edge must be known. More accurate predictions can be calculated using finite element analysis; however, ISO/TR 9464 will normally provide adequate guidance. 2 of ISO 5167-2:2003) on the roughness of the upstream face of the orifice plate that Ra < 10−4d is normally fairly easy to meet at manufacture (definitions of Ra and k are given in Sect. 1). If it were exceeded it would make it difficult to meet the edge-sharpness requirement.

This book only covers thin orifice plates. Small but relatively thick orifice plates of aspect ratio between 1 and 50 are considered by Ramamurthi and Nandakumar (1999) NOTE 2 Background Work on Differential-Pressure Meters Extensive work has been undertaken on the fluid mechanics of differential-pressure meters. 11 Conclusions 23 plate have been made by Bates (1981). e. Dð1ÀbÞ 2 . A very substantial amount of data has been collected by Morrison and co-workers from Texas A&M University. They measured velocity profiles and pressure profiles in orifice meters.

Proc I Mech E 180(1): 331–345 Kent WG (1912) An appreciation of two great workers in hydraulics; Giovanni Battista Venturi… Clemens Herschel. Privately printed, London Kinghorn FC, McHugh A (1978) The performance characteristics of Borda inlet air flowmeters. J Phys E: Sci Instrum 11:87–93 Kinghorn FC, McHugh A, Crawford DA (1975) Effect of cross-wind on three types of differential pressure inlet flowmeter. NEL report no 605. National Engineering Laboratory, East Kilbride Lake WT (1999) Guidelines for choosing, installing, maintaining offshore metering: dealing with the “construction gorillas”.

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