October 7, 2017

No. 27 – Condensate Chambers for Steam Flow Measurement

The basic concept of impulse tubing for steam flow instruments is the same as that behind impulse tubing for liquid flow instruments. However, additional problems are introduced in steam flow measurement because of the difference in density between the flowing fluid (steam) and the liquid (condensate) in the sensing line, which makes a condensate pot necessary to ensure an accurate, reliable steam flow measurement. The connection tubing from the flow measurement device (typically a flow orifice) to the condensate chamber is full of steam, and the tubing from the condensate chamber to the measurement instrument (differential transmitter) is full of condensate.

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