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Cast Steel Duplex Strainers

Eaton Model 50 Duplex Basket Strainer

SIMPLEX STRAINERS ARTICLEDuplex Strainer Designs, Which Duplex Strainer Design is the "Best"?

 

Our cast carbon steel duplex strainers for ¾" to 24" size pipelines are manufactured by Eaton, Titan and Keckley.  Eaton, Titan and Keckley all offer the ¾" - 4" sizes with a ball valve style diverter; actually Titan and Keckley both offer this design for the 6" and 8" sizes also.

 

The ball valve style diverter is the most user friendly design available because all you need to do to divert the flow is rotate a lever 180°so it points over the chamber in-use.  Eaton and Titan have a elastomeric seal, so being a "soft seat" the sealing is superior to Keckley's metal-to-metal seal.  Although some leakage into the isolated chamber is expected with any cast duplex strainer design, the Keckley design might be a little more prone to such leakage.

 

The Eaton Model 50 Duplex Basket Strainer is offered in the 5" to 8" sizes and it has a tapered plug valve style diverter.  This design also uses a lever to divert the flow, but first the operator must "lift" the valve off the valve seat using a screw jack.  The metal-to-metal seating may be advantageous for some applications.  Often the diverting plug is provided in cast bronze material, as it is a replaceable component whereas the "valve seat" is the "strainer body" and not practical to "replace".

 

Cast steel duplex strainers for larger pipeline sizes are available from all three manufacturers.  Eaton's Model 570 Duplex Strainers and  Keckley's SDPXF Duplex Basket Strainers have a sliding disc style diverter.  Rotation of a geared operator slides the discs from one chamber to the other.  Eatons design uses (4) strainer baskets per chamber and Keckley's (2) strainer baskets per chamber.  The concept of multiple strainer baskets per chamber is to reduce the size and weight of the strainer basket to enable an operator to remove them without the need for an overhead hoist.  The Eaton Model 570 Duplex Basket Strainers are available in 8 to 24" sizes whereas the Keckley SPDXF Duplex Strainers are offered in the 10" to 20" size range.

 

Although Titan doesn't offer cast steel duplex strainers for pipelines >8", they do offer 300# class cast steel duplex strainers in the ¾" to 4" sizes, which neither Eaton or Keckley offers.  If you require a 300# duplex basket strainer design from Eaton of Keckley, it will have to be a custom fabricated design, which provides Titan with a significant cost and lead time advantage.

 

You can use our differential pressure calculator for all three brands by selecting the strainer connection size, inputting your flow rate (GPM), inputting the specific gravity if other than water (sg of water = 1) and select 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. 

NOTE: the differential pressure calculator is based upon the model 50 tapered plug valve design for the 8" size because the sliding disc style has lower flow coefficient values and thus a slightly higher clean differential pressure for a given flow rate.  We will gladly assist you with the calculated clean differential pressure figures for the 8" sliding disc style duplex basket strainers if your prefer this design.

 

BRAND MODEL CATALOG PAGES WITH DRAWINGS
KECKLEY SDPX Style SDPX
TITAN DS 596/696/796/896 Model DS 596/696/796/896
EATON 53BTX Model 53BTX
50 Model 50
570 Model 570

 

We are extremely accessible, just a phone call or email away!  We can provide a proposal comparing the cost and lead time for multiple brands or suggest a brand that best fits your requirements based upon the design criteria provided.  The most efficient way for us to assist you is to complete our Duplex Basket Strainer inquiry form, we usually reply within minutes or an hour perhaps.  You can always call us for immediate assistance. We are here to assist you with selecting the best design for your application.