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- W857236711 abstract "A drain hole through an orifice plate is appropriate where some liquid is introduced to a gas pipeline over a short period of time, but thereafter the flow is dry. In this case there is no need for wet-gas measurement; however, it is essential that there is no error during the dry-gas flow due to a pool of liquid that never passes through the orifice. Installing a drain hole can be regarded as equivalent to increasing the area of the orifice in a predictable way: an equation is given in ISO/TR 15377:2007. However, recent data in this chapter show that the existing drain-hole equation in ISO/TR 15377:2007 is unsatisfactory. The data on drain holes have a surprisingly strong dependence on the circumferential location of the pressure tappings, although very little dependence on Reynolds number. A new analysis is presented based on the assumption that, although the differential pressure is disturbed by the presence of the drain hole, the discharge coefficient of the orifice (distinct from the drain hole) is unaffected by the drain hole’s presence provided that the mean differential pressure around the pipe is used. On this basis an equation has been produced for the corrected orifice diameter taking account of the drain hole. More data would be useful; nevertheless it is very desirable to amend ISO/TR 15377:2007, given that for the data collected here its equation leads to flowrate errors up to nearly 2 % in magnitude, whereas the new equation gives errors less than 0.25 % in magnitude." @default.
- W857236711 created "2016-06-24" @default.
- W857236711 creator A5001273916 @default.
- W857236711 date "2015-01-01" @default.
- W857236711 modified "2023-09-25" @default.
- W857236711 title "Orifice Plates with Drain Holes" @default.
- W857236711 cites W3200788958 @default.
- W857236711 doi "https://doi.org/10.1007/978-3-319-16880-7_10" @default.
- W857236711 hasPublicationYear "2015" @default.
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