You Can’t Sell ’em if You Can’t Size ’em | How to Size an Industrial Strainer

Sizing a Strainer by the system pipe size can get you into trouble. If the Strainer is to small, it won’t do the job effectively. To properly size a Strainer – use the pressure drop across the Strainer with a clean basket installed. Properly sized strainers will have a clean start-up pressure drop of 2 psi or less and line velocity between 6 – 10 feet per
second. 6 to 8 feet per second in the case of plastic Strainers.

Here is what you need to know; (1) Flow rate, (2) How dirty the process media is, (3) The size particle to be removed and, (4)
System pressure and temperature.

If the flow through the system is very dirty, don’t be afraid to recommend the next larger size Strainer. lt might cost more initially, but It will require less frequent basket cleaning and this will result in reduced operating costs. This resultant labor savings will more than pay for the difference in the cost of the larger Strainer.

Once the Strainer size has been determined, select the right material of construction for the service (water = cast iron, fuel oil = carbon steel, seawater – bronze, chemicals = stainless steel). Now consider the line pressure to select the right design (standard or high pressure) and the temperature to select the correct seal (o-ring or gasket). If in doubt about the material of construction, ask the customer what material the existing pipe is. It is usually safe to use a Strainer of the same material of cor1struction I as the pipe.

Thafs it! Thats really all there is sizing a strainer.

Most plant personnel relate better Head Loss rather than Pressure Drop when sizing Strainers for a pipeline. To convert pounds per square inch (psi) to Head Loss (feet if head / feet of water) multiply psi by 2.311 to obtain Head Loss. Ex: 1.5 psi clean start-up pressure drop x 2.311 = 3.47 Head Loss.

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About Eaton's Filtration Business
Eaton’s Filtration business is a global leader in manufacturing filtration products that include automatic self-cleaning and fabricated pipeline strainers, mechanically cleaned filters and strainers, bag and cartridge filtration systems, and gas liquid separators for industrial customers worldwide.

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