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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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How to optimize pumping cost

Use a variable-speed pump and minimize valve pressure drops.

Oct 30, 2018

*Q:* Delivery of transmix fuel to two separation towers is being upgraded. Coriolis meters were installed and are currently functioning. Two PID flow control loops currently maintain flow. The transmix liquid passes through a series of heat exchangers on its way to the towers. It is estimated that between the friction losses in the heat exchangers and the elevation change, the head loss is on the order of 30 psi.

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