AutoQuiz is edited by Joel Don, ISA’s community manager.

Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for information about the CCST program. This question comes from the Level I study guide, Domain 3, Troubleshooting. Level I represents a professional who has a five-year total of education, training, and/or experience.

The most common pressure tap is the:

a) corner
b) flange
c) pipe
d) vena contracta
e) none of the above



Click Here to Reveal the Answer

The purpose of pressure taps is prevent gas or vapor accumulations in the connections between the pipe and differential-pressure (dP) measuring device.

There are five common locations for dP taps. They are flange taps, vena contracta taps, radius taps, full-flow (or pipe taps), and corner taps.

In the U.S., flange taps are the predominant choice for pipe sizes 2 inches (50 mm) and larger.

The best answer is B, flange.

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