Learning the basics can ease loop tuning frustration and ensure stability. During plant operations, it seems that tuning control loops is an ongoing task, which can be a continual frustration to ...

Confusion and misinformation seem to be the order of the day when it comes to rating pneumatic valves. For instance, in a recent MACHINE DESIGN article ("Clearing the Air on Pneumatic Valve Ratings," ...

A flow rate test is used to work out the melt flow rate (MFR) of a thermoplastic material. According to ASTM 1238, “Method A” test involves the collection of extrudate from the die over a set period ...

Oil field operators can use several practical equations for calculating flow rates of natural gas through venturi gas-lift valves. For critical flow, this analysis derived such equations from a ...

What is a peak expiratory flow rate test? The peak expiratory flow rate (PEFR) test measures how fast a person can exhale. The PEFR test is also called peak flow. This test is commonly performed at ...

Various axial and centrifugal fan performance curves will be illustrated throughout this article, with no attempt made to rationalize any particular selection. The most important characteristic of a ...