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Ask The Experts"Ask The Experts" is moderated on ControlGlobal.com by noted process control authority and CONTROL Columnist Bela Liptak. Liptak either answers the questions himself, or brings in one or more experts from his cadre of co-authors that worked with him on the Instrument Engineers' Handbook, Fourth Edition. Save yourself the hefty consulting fees by getting the answers to your questions here.

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Ask The Experts: How to protect a venturi flowmeter?

Our panel of experts explore best practices for dealing with buildup on chemical seals of a differential pressure flowmeter.

Oct 18, 2016

*Q:* We have a venturi flowmeter with 3-in. flanged pressure taps and flanged chemical seals with capillary tubes in a 44-in. vertical pipe (Figure 1). The fluid is hydrocarbon (polymeric) gas. The problem is that the chemical seal diaphragms often need to be cleaned because of buildup from the gas that includes methane, ethylene, etc., with sand in it. We would like to have continuous flow measurement even during cleaning.

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