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Title: Orifice Plates With Drain Holes
Author: Dr Michael Reader-Harris David Addison
Source: Flomeko 2013
Year Published: 2013
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

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