Fluid Flow - Articles
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Product Viscosity Versus Shear
We were concerned when a client stated that their product has a viscosity of 2000 to 3000 cP. How could we pump this material from the manufacturing tank to the filling line? Luckily, we had a plant and resources to conduct a full-scale test. The objective of the test was to…
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Valve Sizing and Selection
Sizing flow valves is a science with many rules of thumb that few people agree on. In this article I'll try to define a more standard procedure for sizing a valve as well as helping to select the appropriate type of valve. **Please note that the correlation within this article…
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Centrifugal Pumps: Basic Concepts of Operation,...
The operating manual of any centrifugal pump often starts with a general statement, "Your centrifugal pump will give you completely trouble free and satisfactory service only on the condition that it is installed and operated with due care and is properly maintained." Despite…
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Centrifugal Pumps: Understanding Cavitation
Operating a pump under the condition of cavitation for even a short period of time can have damaging consequences for both the equipment and the process. Operating a pump at low flow conditions for an extended duration may also have damaging consequences for the equipment. In…
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Understanding Compressible Flow
Understanding the flow of compressible fluids in pipes is necessary for a robust design of process plants. The main difference between incompressible fluid, like water, and compressible fluid, vapor, is the greater change in pressure and density. This makes the calculations for…
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Using Equivalent Lengths of Valves and Fittings
One of the most basic calculations performed by any process engineer, whether in design or in the plant, is line sizing and pipeline pressure loss. Typically known are the flow rate, temperature and corresponding viscosity and specific gravity of the fluid that will flow through…