Eaton model 90 fabricted duplex strainers with ASME code stamp

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Custom Fabricated Duplex Strainers

Eaton model 950 duplexed basket strainers

Hayward/Eaton Fabricated Duplex Strainer Model 950

Eaton model 950 duplex strainers are used when cast duplex strainers will not suffice.  Sometimes special alloys are required or there are other aspects of the application just not suitable for cast duplex strainers, necessitating a custom fabricated design instead.  Custom fabricated strainers enable  providing specific straining ratios, differential pressure drop, can be ASME code stamped, have corrosion allowance and be designed to satisfy a multitude of design criteria.

 

Eaton's model 950 duplex strainers consist of two fabricated Eaton model 90 basket strainers modified to have their inlet and outlet nozzles located on the same side.  The two basket chambers are connected to an inlet and outlet pipe tee with butterfly valve to control the flow path.  One set of valves are closed, causing the flow to pass through the other chamber.  When it is time to clean the strainer basket, flow is diverted to the clean chamber and the dirty basket chamber is isolated so it can be safely accessed.  The connections to the pipeline are typically ANSI flanged although can also be butt weld or some other connection as required.

 

There is a specific order to manipulate the diverting valves to ensure the process flow is not interrupted.  First open the clean chamber discharge valve, then open the its inlet valve.  Next close the discharge valve for the dirty basket chamber and then close its inlet valve.  After venting the basket chamber and draining the fluid, the basket chamber can be safely accessed.

 

The type of valves used for Eaton model 950 duplex strainers are usually butterfly valves, although ball valves can be used if required.   There are single, double and triple offset butterfly valves as well as 1, 2 and 3 piece ball valves; the valves used will depend upon the specific requirements of your application.  It is possible to use a pair of 3 way diverting ball valves that are linked together to accomplish a similar diversion, however it is  uncommon.  It is also possible to install actuators to automate the sequence and eliminate manual manipulation of the valves.

 

The baskets for model 950 duplex strainers might require an overhead winch or lifting mechanism.

 

If your particle load is continuous and the pipeline 6" or larger, consider an automatic strainer which might cost the same or slightly less and provides the advantage of automatic operation without interruption of process flow.

 

For some applications we can supply a hinged "quick-opening" basket chamber cover design, which is especially useful for larger size strainers that would otherwise require a cover lifting davit assembly.

You can use our calculator above to approximate the clean differential pressure drop by selecting the strainer connection size, inputting your flow rate (GPM), inputting the specific gravity if other than water (sg of water = 1) and selecting the viscosity range if other than water (SSU of water = 30).  Click "Update" to refresh the data and be sure that the clean differential is ≤2 PSI for the intended basket retention.

 

Sometimes to attain the desired clean differential pressure a larger size strainer body is required, and since these are custom fabricated, attaching smaller connections to match your pipeline is not a problem.

 

Eaton's model 950 duplex strainers typically have a engineering and manufacturing lead time ranging from 6-12 weeks depending upon the degree of customization required and current shop load.

 

The part numbers for the Eaton model 950 duplex strainers are listed below. Link: Eaton model 950 fabricated duplex strainer specifications and IOM manual.

 

Eaton model 950 part numbering chart