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Pump Suction Strainers, Which is best?
- Jop
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15 years 7 months ago - 15 years 7 months ago #7382 by Jop
Do it once and Do it Right
Pump Suction Strainers, Which is best? was created by Jop
I had this question come up on another forum and I thought I would share it here too.
Pump Suction Strainers, Which is best?
That is a very good question. The selection of a strainer depends on many factors. These include purpose, operating philosophy, maintenance philosophy, commodity, entrainment s, space and cost.
There are four basic configurations (types) and they each have positive and negative points. The common types are listed below in alphabetical order along with some comments about selection.
Basket Strainers
www.fabrotech.com/std_bk.htm (Simplex)
www.fabrotech.com/duplx.htm (Duplex)
The Basket Strainer is normally fabricated and can be found in a wide range of sizes and materials. The larger sizes will come with legs for support (reduces loading on pump nozzles). The larger sizes require davits or monorails to remove the basket. Depending on the commodity they should also be located in a paved, curbed well drained area for removal and cleaning. Removal and re-installation of the basket does not normally effect the pump alignment. The available “cross-sectional area†choices depend on the screen selected. The Duplex Strainer allows for full operation on one strainer chamber while the other side is in full operation.
Cost]www.weamco.com/cone.htm[/url]
The Cone Strainer is normally a prefabricated, off-the-shelf piping item. They come in two basic configurations]www.fabrotech.com/teestr.htm[/url]
The TEE Strainer is a strainer fabricated from a standard piping TEE. The end-to-end dimensions are the same as a standard TEE. They are available with butt-weld ends or with flanged ends. The screen removal cover can be flanged or quick release toggles. TEE strainers also come with the “flow†in one end and out the other (screen removal from the branch) or in one end and out the branch (screen removal from the end). The removal or installation of the screen does not affect the pump alignment. The available “cross-sectional area†choices depend on the screen selected.
Cost]www.fabrotech.com/c_carb.htm[/url]
The “Y†Strainer may be cast steel or fabricated. The “Y†Strainer is designed to allow for in place “blow-down†cleaning. Depending on the commodity and the “blow-down†piping this strainer can be cleaned while in full service. The “Y†Strainer is available in various end connection choices including screwed, socket-welded, butt-welded, flanged and mechanical-joint. The “Y†Strainer also comes in a wide range of sizes from very small to 24â€. The “Y†Strainer only comes with the flow in one end and out the other.
Cost]www.pelmareng.com/pdf/Filters/Fa ... ainers.pdf[/url]
Pump Suction Strainers, Which is best?
That is a very good question. The selection of a strainer depends on many factors. These include purpose, operating philosophy, maintenance philosophy, commodity, entrainment s, space and cost.
There are four basic configurations (types) and they each have positive and negative points. The common types are listed below in alphabetical order along with some comments about selection.
Basket Strainers
www.fabrotech.com/std_bk.htm (Simplex)
www.fabrotech.com/duplx.htm (Duplex)
The Basket Strainer is normally fabricated and can be found in a wide range of sizes and materials. The larger sizes will come with legs for support (reduces loading on pump nozzles). The larger sizes require davits or monorails to remove the basket. Depending on the commodity they should also be located in a paved, curbed well drained area for removal and cleaning. Removal and re-installation of the basket does not normally effect the pump alignment. The available “cross-sectional area†choices depend on the screen selected. The Duplex Strainer allows for full operation on one strainer chamber while the other side is in full operation.
Cost]www.weamco.com/cone.htm[/url]
The Cone Strainer is normally a prefabricated, off-the-shelf piping item. They come in two basic configurations]www.fabrotech.com/teestr.htm[/url]
The TEE Strainer is a strainer fabricated from a standard piping TEE. The end-to-end dimensions are the same as a standard TEE. They are available with butt-weld ends or with flanged ends. The screen removal cover can be flanged or quick release toggles. TEE strainers also come with the “flow†in one end and out the other (screen removal from the branch) or in one end and out the branch (screen removal from the end). The removal or installation of the screen does not affect the pump alignment. The available “cross-sectional area†choices depend on the screen selected.
Cost]www.fabrotech.com/c_carb.htm[/url]
The “Y†Strainer may be cast steel or fabricated. The “Y†Strainer is designed to allow for in place “blow-down†cleaning. Depending on the commodity and the “blow-down†piping this strainer can be cleaned while in full service. The “Y†Strainer is available in various end connection choices including screwed, socket-welded, butt-welded, flanged and mechanical-joint. The “Y†Strainer also comes in a wide range of sizes from very small to 24â€. The “Y†Strainer only comes with the flow in one end and out the other.
Cost]www.pelmareng.com/pdf/Filters/Fa ... ainers.pdf[/url]
Do it once and Do it Right
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- 11echo
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15 years 7 months ago - 15 years 7 months ago #4776 by 11echo
Replied by 11echo on topic I'd like to give a
I'd like to give a partial reply to this question. I primarily would like to look at "Tee" strainers. I've have had to deal with this type of strainer a number of times in a water treatment facility I was designing, and there are a number of issues with this strainer.
First and foremost this strainer needs to be installed in the vertical position with the commodity flowing down! The fabrication of this strainer is basically installing "rails" on the I.D. of the branch side of the tee, with the basket positioned perpendicular to the flow, then a basket is fabricated to fit on these rails and is large enough so that the flow that is force through the basket is screened a 100%. Access to this basket is "normally" through a flange with a blind. This also points to the vertical positioning of this strainer, to access the basket (by pulling off the blind) the debris that is collected in the basket need to remain there so it can be easily removed. IF this "Tee" strainer was positioned horizontally the debris would fall back into the pipe as the basket was removed or as the commodity flow was halted.
I deem this type of strainer as a specialty item and not for use as common application; it is only as effective as a common cone type strainer. However "if" your application meets the positioning requirements then maintenance is much easier because it doesn’t require removal of a spool piece to remove the debris. This is one of those tricks a designer should be aware of, but not commonly used. …My $0.02 anyway.
First and foremost this strainer needs to be installed in the vertical position with the commodity flowing down! The fabrication of this strainer is basically installing "rails" on the I.D. of the branch side of the tee, with the basket positioned perpendicular to the flow, then a basket is fabricated to fit on these rails and is large enough so that the flow that is force through the basket is screened a 100%. Access to this basket is "normally" through a flange with a blind. This also points to the vertical positioning of this strainer, to access the basket (by pulling off the blind) the debris that is collected in the basket need to remain there so it can be easily removed. IF this "Tee" strainer was positioned horizontally the debris would fall back into the pipe as the basket was removed or as the commodity flow was halted.
I deem this type of strainer as a specialty item and not for use as common application; it is only as effective as a common cone type strainer. However "if" your application meets the positioning requirements then maintenance is much easier because it doesn’t require removal of a spool piece to remove the debris. This is one of those tricks a designer should be aware of, but not commonly used. …My $0.02 anyway.
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