Mystery pump case connection 2

[amazing azza]

Hello friends, I was wondering, what is this connection on the case of a centrifugal pump intended for? Pressure sensor? Overheating probe?

 

[Artisi]

Air bleed / priming.

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.)

 

[amazing azza]

Ah, thank you! How do you go about using it? Run the pump and unscrew slightly until water comes out?

 

[pennpiper]

amazing azza,
Before you close the book on this question lets consider another possibility.
Pump Manufactures do not only make castings for one commodity or service. Long ago I was involved in a project where pumps for the same service (mated A&B) were not the same casting. They were a slightly different size and looked different, but the Pump Curves were the same.
My point regarding your Pump question is: Your Pump case may have originally been cast for some totally different service. That other service required something special, maybe a Slip Stream Recycle, to prevent cavitation, who knows. The Pump Manufacturer had a left over casting that met your needs so they did not need to pour a new casting. If this little connection does not affect your pumping requirements then don't worry about it.

Sometimes its possible to do all the right things and still get bad results

 

[mk3223]

It could be the pump seal flush connection since the short discharge nozzle. The vendor should specify the connection function on the pump drawing.

Interesting to see what's the service for the pump by having the SS piping.

 

[LittleInch]

My guess is that this is some sort of tap off for a seal flushing system internal to the pump.

Should be visible on the pump drawing.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Artisi]

Doubt it is anything to do with seal flush etc, as the tapping looks to be on the low pressure side of the volume. But who kowns for sure, why not ask the pump supplier or manufacturer


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.)

 

[amazing azza]

Opinions have diverged I thought it was something common, albeit unknown to me. I guess it would be interesting to talk to the maker. Will be difficult though. This one hides behind resellers and does not want anything to do with end customer.

PS. The service is clean water

 

[pennpiper]

amazing azza.
I don't think this connection has any thing to do with the Pump Seals or Glans. This connection is in direct alignment with the volute and impeller, not the barrings.

Here is a pump with a connection somewhat like the one you are showing.

http://www.lukesindonesia.com/ebara-centrifugal-end-suction-volute-pump/

Sometimes its possible to do all the right things and still get bad results

 

[amazing azza]

Pennpiper, indeed it is an Ebara pump I have not seen that second brochure before - good find. From the diagram within, the "A" does appear to be for priming seeing how it has a funnel drawn on it... Do you interpret it the same way?

But wait, there's more! There is also port "B". (I did not bring this up previously to avoid confusion). Any ideas for that one?

 

[LittleInch]

Well if A is fill, then the higher B is the vent.

I've never seen anything like this funnel thing before though.

Given that one use is for "swimming pool" may be its a way of adding chemicals? That one's a bit off the wall....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Artisi]

B is only a vent if there is a NRV or similar on the discharge, being top centre discharge, the pump is self venting.


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.)

 

[bimr]

The accessory sheet lists the location "A" for a "priming funnel".

See page 1

The priming funnel would be handy for an pumping operation like a swimming pool pump where the system is used only seasonally and must be drained. Filling and draining pumping systems may take some time if the pumping system designer does not anticipate what is required to accomplish the fill/drain tasks.

 

[Compositepro]

Note the drain plugs in the photos.

 

[amazing azza]

Note the drain plugs in the photos.

Ah, yes, very good observation! Surprisingly few pump makers (Ebara notwithstanding) include those by default.

 

[Artisi]

usually not included in heavy duty process pumps as it / they are a point for erosion.

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.)

 

[amazing azza]

Artisi, well noted. A bit of an off-top: how about blower fans? A case drain on the bottom - maybe 1/2" pipe w/ a ball valve - what is the downside to having one?

 

[Artisi]

Amazing azza, sorry can't comment on fan.

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.)