CENTRIFUGAL PUMPS 1

[Mech7802]

Hello Everyone

I am a new joinee for the forum, requesting your help.

I request you to help me know the disadvantages of TOP Suction top Discharge Split case pumps over side suction side discharge

please advice

Thank you

 

[DubMac]

The relative benefits of either configuration depends on the service and application you are talking about. Can you be a bit more illustrative with your question?

Your question makes it sound like you have already made your mind up that Side/Side configuration is always a more preferable choice.

 

[Artisi]

absolutely no disadvantage in the right application whereas the side/side would be disadvantaged. Horses for courses as they say.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Mech7802]

Thanks For the quick reply Sir

the application if for closed loop chilled water pumps.

The contractor wants to go with TOP Suction, Top Discharge, where as I was proposing the side suction and side discharge.

as per my understanding, the Top suction top discharge pumps will have more vertical load on the flanges and also the maintenance of these pumps is more complicated than side suction and side discharge as you can just remove the upper casing and make any maiantanatce.

please advice if I am correct and also let me know if there are any more points to be considered

Thank you

 

[Artisi]

regarding maintenance, depends on pump configuration.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[DubMac]

There is a certain vendor, and I can't mention their name (B&G), that tries to spec in Top/Top always because they used to be the only major HVAC pump manufacturer to offer top/top configuration, and may still be for all I know. There are arguments for both designs but they really don't amount to much more than marketing gimmicks.

The top/ top does save floor square footage in a tight mechanical room, but really depends on the piping layout if that is an advantage or not. In terms of flanges, there shouldn't be any load on the flanges AT ALL from the piping; they are not pipe hangers, and that goes for the horizontal configuration as well.

Side/side or, splitcase pumps as they are commonly called, are fairly easy to open up for inspection, but as I recall, the bundle comes out fairly easily on the B&G's also (oops, I said their name again). A competent maintenance crew can deal with either pump with no inherent advantages or disadvantages other than their experience with one or the other.

I would not put either design as preferred because you will paint yourself (or the owner) into a corner in terms of having choices. I would be more concerned with efficiencies, NPSH margins, shaft L3/D4 ratios, etc. And the slower a pump runs, the longer it will last.

 

[Mech7802]

Sir

Thank you very Much for your advices, it was helpful for me

thanks

 

[Artisi]

I agree with DubMac, make the decisions using good engineering practice, review all the options not just the inlet / outlet configuration -- unless of course you have a site restriction dictating a configuration.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)