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Title: Orifice Plates With Drain Holes
Author: Michael Reader-Harris David Addison
Source: 2014 North Sea Flow Measurement Workshop
Year Published: 2014
Abstract: Where a gas flow is continuously wet an orifice pla te does not require a drain hole. However, a drain hole is appropriate where s ome liquid is introduced to the pipeline over a short period of time, but thereafte r the gas flow is dry. In this case there is no need for wet-gas measurement the problem is that during periods in which there is some liquid flow a pool o f liquid will build up against the upstream face and thus the metering accuracy will b e undermined even during the time when the flow is dry. Another installatio n where a drain hole was found appropriate was one where without a drain hole ther e was very significant accumulation of dirt a new orifice plate with a dr ain hole allowed small particles of dirt to pass the plate and hence solved the prob lem

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