ORIFICE PLATES WITH DRAIN HOLES

Dr Michael Reader-Harris, David Addison

Abstract

This paper presents new data and shows that the existing drain-hole equation in ISO/TR 15377 is unsatisfactory: it leads to flowrate errors up to nearly 2% in magnitude. The data on drain holes have a surprisingly strong dependence on the circumferential location of the pressure tappings. However, a new analysis takes this into account and has produced a formula for d’, the corrected orifice diameter taking account of the drain hole. It is very desirable to amend ISO/TR 15377:2007.

Keywords

orifice plates, drain holes, ISO/TR 15377

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IMEKO-TC9-2013-088.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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