Custom Fabricated Duplex Strainers Eaton model 950 duplexed basket strainers

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.

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Description

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.

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