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SIMPLEX STRAINERS

Simplex strainers, also sometimes referred to as basket strainers, are used to protect equipment and processes downstream from particulates. Since they only have one chamber, they are typically used for batch applications or for applications that allow temporary shut-down to enable accessing the strainer basket, removing it from the strainer body and cleaning it prior to putting it back into service.

 

Most simplex strainers are cast or molded; fabricated versions are used to satisfy special material or performance specifications.  The fluid enters through an inlet nozzle and flows downwards into a perforated or mesh lined basket.  Fine mesh rquires an underlying perforated substrate for rigidity.

 

The clean fluid exits through a nozzle located 180º from the inlet nozzle leaving the particulate behind within the basket.  As the strainer basket becomes covered in particulate, the differential pressure across the clean and dirty side of the basket increases.  If it increases beyond the 15-20 PSI range there is a real risk of basket damage.

Eaton Model 72 Simplex Strainer Cutaway View

The initial clean differential pressure for simplex strainers should be ≤ 2 PSI for most applications and the strainer baskets should be cleaned prior to the differential pressure exceeding 15 PSI.

 

To safely access the strainer basket, it requires shutting off the inlet and outlet valves, effectively isolating the simplex strainer from system pressure and flow rate.

 

Next open the simplex strainer vent and/or drain valves to relieve the system pressure within the strainer body, making it easier to remove the strainer basket chamber cover.

 

Most of our simplex strainer covers can be removed without tools; some designs require removing nuts from studs.  Once the cover is removed and sufficient fluid drained, the strainer basket can be lifted from the strainer body and cleaned.

 

Cleaning should be done by rinsing with an appropriate, compatible fluid.  Compressed air and brushes can also be used for dislodging material not easily rinsed off.

 

Sometimes it's easier to have a spare basket to swap in service and let the dirty basket soak for easier cleaning.