Pressure Transmitter Mounting
March, Column Instrumentation Basics, p. 48
The illustration in Figure 9 purports to show a flowmeter installation for vapor or gas. In vapor or gas service, the differential pressure and pressure transmitters are always mounted above the process taps, with the impulse tubing sloped from the transmitters to the process taps, without low point or high point pockets. This is done to prevent liquids from accumulating in the impulse lines and causing errors. Pretty art, bad installation engineering.
Yours very truly,
Douglas J. Morrison
Project Manager, WorleyParsons, Deer Park, Tex.
Author’s reply:
Thank you, great catch! This figure illustrates the opposite of what is in the text.
Sincerely,
Ruth Sands
Senior Consulting Engineer, DuPont Engineering Research & Technology, Wilmington, Del.
Correction
November, Facts At Your Fingertips — Pump Selection and Specification, p. 29
In the Pump Comparison Chart, under Centrifugal Pumps, Viscosity, it is written that "Efficiency increases with increased viscosity." It should read, "Efficiency decreases with increased viscosity." A more complete comparison of centrifugal and positive displacement pumps, including a discussion of…
Related Content Feeling video fatigue? It has been a full year since our world was changed by the coronavirus pandemic. The disruptions to our lives…2019 Kirkpatrick Award Finalists Every two years, Chemical Engineering honors an innovative technology that has been commercialized with the Kirkpatrick Chemical Engineering Achievement Award.…The 2019 Kirkpatrick Award: Nominations are now open As chemical engineers, many of us work on developing new processes or improving current ones, often with goals of better…Preparing for unprecedented storms This year, hurricane season in the U.S. has been active again, with Hurricane Florence battering North Carolina and its surroundings…Starting strong Last month, the American Chemistry Council (ACC; www.americanchemistry.com) issued its annual year-end report, which offers a positive outlook for the…
Chemical Engineering publishes FREE eletters that bring our original content to our readers
in an easily accessible email format about once a week.
Subscribe Now