How to increase pressure of 22 Bar multistage hotwater pump?

[tangochem]

Hello!

I am new in this field.
I have 22 bar (discharge pressue) Multistage HOT WATER pump ( Temp. of water is 165 C) in the factory. But now i want to upgrade pressure up to 30 Bars. Please tell me the efficient and the most economical way to enhance the pressure? Is installation of other small pump in series makes it possible to boost the pressure up to 30 bar? and how?

Regards!

 

[GPRnD]

You can certainly add a booster pump in series as long as it has a similar BEP. All you would do is modify the discharge piping to route fluid into the booster pump. Issues will be available space and pipework layout.

Your booster pump must be designed for a 22 bar suction pressure and 30 bar discharge. This will preclude the use of certain pump types such as end suction which may not be suited to high suction pressures.

If your pump is a BB4 (ring section pump), then you might be able to add extra stages to the existing pump. However this will require a new shaft and probably a new motor and baseplate.

It is not uncommon for customers to order BB3, BB4 and BB5 pumps with destaging sections so that they can upgrade the pressure at a later date. However there is a limit to how many destaging sections can be added to any pump before rotordynamics become a problem.

 

[Artisi]

For a 50% increase in head, the most economical solution may well be a new pump sized for the duty.

Can we assumed that the existing pump is operating at 2 pole motor speed?

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.)

 

[PumpSmart]

tangochem,
First see how many stages your multistage have.
Some multistage has 03 or 04 stage can go up to 12 - 13 stages.
So you should double check your new duty point at rpm you have (1200, 1500, 1800, 3000, 3600 rpm, etc). # stages depends of
AWP and mechanical stability.
If incresing # of stage or increasing impeller diameter or both,you can meet this new duty point,
you will check P-T (pressure vs temperature casing curve at discharge flange rating # and material) curve to be sure your casing has AWP (allowable working pressure bar) value more than discharge pressure bar(at shut off point)and if this happends, you double check AWP for discharge side mechanical seal.
If increasing # of can not meet, check increasing RPM or put multistage in series arragement (2, 3, whichever you need).
If it does not work, change multistage size or desing.

Be aware you will check P-T (pressure vs temperature casing curve at suction & discharge flange rating # and material) curve to be sure your casing has AWP (allowable working pressure bar) value more than discharge pressure bar(at shut off point)and also, you double check AWP for discharge side mechanical seal.

Most european pump mfg design for 40 or 55 bar, but, for ambiente temperature, for 165 C it is highly advisable to check P-T tables or chart with pump mfg.

I hope it helps

 

[Pumpsonly]

Is this a real case or hypothetical?
Without giving details of the existing pump, driver, pump curve, flow rate, impeller dia. you are not going to get meaningful answer.
Some methods may work on a certain type of pumps and not on others.

The easiest will be by putting a VFD to increase the speed by 16% provided you pump can take the extra power and pressure and also the driver.

Otherwise is best to buy a new pump.