Strainer at pump discharge

[amar122amar]

I wanted to know the applications where strainer (filter) is used at pump discharge. What r the advantages and disadvantages of strainer at pump discharge vs at suction. We have a double diaphragm pump. Application is slurry service with very low flow rate 3 to 7 kg per hour.

 

[Sina]

I think it is used for separate some solid particles which are harmful for downstream equipments

 

[Latexman]

Most of the strainers I've seen (Y-type or basket strainer) are in the pump suction. This protects the pump and downstream equipment, like control valves, which can have narrow passages.

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

 

[SNORGY]

If the strainer is on the downstream side - by intent - then someone has made the decision that the pump can accommodate the solids. That might not be surprising since double diaphragm pumps have been used successfully in some sandy services for decades. For example, I have seen Sandpiper DD pumps in oil batteries off treaters, separators and sumps. So, presumably, it's not the pump that appears to be giving people concern so much as what's going on downstream. A sketch of the P&ID would help.

 

[Latexman]

I should add that my background is in monomers (that polymerize) and latex products. If we put too much dP across the strainer we can squeeze/extrude polymers/solids through the strainer. That's another reason our strainers are on the suction side.

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

 

[elridyeng]

strainers should be at pump suction to protect downstream equipment from damage

 

[25362]

Side stream (as a spill-back) filtration systems continuously filter a portion of the cooling water from cooling towers to remove suspended solids, organics, and silt particles, reducing the likelihood of fouling and biological growth on downstream coolers/condensers.

 

[don1980]

This is obviously a very unusual installation. A "slurry" being pumped at 3 - 7 kg per hour? Aside from a solid similar to dust, it's hard to visualize a case in which particles remain suspended in liquid at that flow rate. I assume that the line size is no bigger than say 1/8" or 1/4".