Reg Centrifugal Multistage pump selection

[Charismatic]

DEAR ALL,

I M HAVING DOUBT THAT,WE REQUIRE CENTRIFUGAL MULTISTAGE PUMP FOR CONDENSATE IN OUR EXISTING PLANT ,
WE RECEIVED VENDOR OFFERS FOR THE SAME.
WE ASKED VENDOR TO PROVIDE FOR THIS SPECIFICATION: 50 M3/HR, SUC PRESSURE 0.98 BAR ,DISCHARGE PRESSURE 38 BAR, SP GRAVITY 0.75,OPERATING TEMP 35-40 DEG C.
VENDOR OFFERED LOW NPSH PUMP SPECIFICATION : 421 M HEAD ( RATED), AND SHUT OFF HEAD IS 457.3 M.

KINDLY SHARE YOUR KNOWLEDGE FOR THE ABOVE PUMP DATA IS SUITABLE FOR THIS OR NOT.

AS I UNDERSTOOD FROM THE VENDOR DATA THIS PUMP IS NOT ABLE TO GIVE DISCHARGE PRESSURE UPTO 38 BAR ,PLS CORRECT IF I AM WRONG.
P=0.0981 *421*0.75
P= 30 BAR PRESSURE ONLY.

THANKS

 

[MJCronin]

Please turn off your "all caps" key...

What exactly do you mean by: "I M HAVING DOUBT THAT,WE REQUIRE CENTRIFUGAL MULTISTAGE PUMP FOR CONDENSATE..."

Are you trying to say, you doubt that a multistage pump is required for this service ?

In my opinion, only a multistage or a positive displacement pump would meet your service needs. Multistage centrifugal pumps are very commonly used in high head, large volume service.

It does not seem that your vendor submission meets your specification ....

Is this pump being used as a boiler feed pump in a steam power plant ?

MJCronin
Sr. Process Engineer

 

[LittleInch]

From the limited data you've sent us it look like the vendor has mis read the data sheet.

If you need 38 bar then go back to them and tell them that. It is quite strange that a vendor won't give you what you want but maybe it wasn't clear? Did you state your differential head in M on the data sheet? If not why not?

PS. Please don't use all CAPITALS again. It is interpreted as SHOUTING!

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