Model 950 and 900 Fabricated Duplex Strainers - 1" to 48"
Overview
Duplex strainers remove damage causing particulate matter from the process media, and never have to be shut down for strainer basket cleaning…the line can run continuously. When one strainer basket needs to be cleaned, flow is switched to the other. The first basket is removed, cleaned and is ready for use again.
Both the Model 950 and 900 feature two basket strainer housings with a valve flow diverter assembly connecting them. When the basket in one housing is ready for cleaning the flow is switched to the other housing using the valve assembly. The first basket is then removed, cleaned and is ready to be put back into service. The Model 950 has an offset inlet and outlet, with the inlet located above the outlet. The Model 900 has the inlet and outlet in the same plane.
Eaton can custom fabricate a duplex strainer to meet the requirements of your application. Both manual and automated operation is available. If a standard duplex strainer won't work in your application Eaton can help you design a Fabricated Duplex Strainer to meet your exact your specifications...with no compromises
Two Cover Types
Models 950 and 900 feature a choice of two cover types. The simplest type is the bolted cover which is cost effective and works well in applications where basket changing is infrequent. A davit assembly can also be specified for larger strainers that have heavy covers. This makes it possible for a single person to remove and replace the cover of the strainer.
If the strainer will be opened frequently for basket cleaning, a bolted cover can be less effective because of the time needed to remove and then re-install the cover bolts. Fore these applications Eaton offers a special, hinged quick opening cover that is secured by swing bolts. This type of quick opening cover can even be adapted for higher pressure applications if required. For medium size strainers, 8" to 16", a bolted slide hinge cover can be specified. This allows a single operator to open and close the cover. Eaton can also design and manufacture special covers to meet the requirements of any application.
Unique Strainer Baskets
Eaton has designed a special, unique strainer basket for its Fabricated Duplex Strainers. The basket has a slant top design which improves the flow through the strainer and results in significantly lower pressure drops than would otherwise be the case. The slant top design results in a more compact basket which weighs less than an ordinary basket and makes it possible for a single person to remove it from the strainer housing. This is a real labor saving feature when it becomes time to clean or change out the basket. Strainer baskets are made of stainless steel, although almost any type of material can be specified. Basket perforations from 1/32" up to 1" are available and mesh linings in sizes from 20 to 400 mesh for fine straining applications can be specified.
Many Available Options
The Model 950 or 900 will meet the requirements of most duplex strainer applications. However, should modifications be required they are easy and cost effective to do. Often it is thought that a custom designed duplex strainer is required for an application. Then, on examination of the Model 950 or 900 it is found that a few simple modifications to the basic design results in a strainer that fits the application perfectly and a significant cost savings over a custom design.
Fabricated duplex strainers can be designed with a backflush/backwash option. In these designs a piping connection with an on/off backflush valve is fabricated at the strainer bottom and has a connection to the bottom of the strainer basket. When solids accumulate in the bottom of the basket, the backflush valve is opened and the differential pressure between the operating pressure and the back flush system removes the solids without shutting the system down. Backflushing is often supplemented by a backwashing operation. Backwashing is done by having fluid flow, under pressure, in the reverse direction into an empty strainer. This flow reversal backwashes the basket and removes the residual dirt. Backwashing is often regarded as a second step, used to remove dirt not removed by back flushing.
Steam jacketing is another available option. This is used to maintain critical fluid temperatures through the strainer. High temperatures are often required to process and transport highly viscous fluids. This modification is designed so that there is no impact on the function or normal maintenance of the strainer. Steam jacketing is available in carbon steel and Type 316 stainless steel for service up to 450°F.
Eaton can design and fabricate Model 950 and 900 Duplex Strainers to ASME Section VIII and ANSI B31 codes. Eaton welders are qualified to ASME Section IX.
For more information, contact us by phone 1-888-924-6233 or by E-mail.
