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Issue Of Negative Npsh In Positive Displacement Pump-Double Diaphragm
#1
Posted 02 June 2017 - 01:15 AM
#2
Posted 02 June 2017 - 01:38 AM
hi ,
can you cool the stream prior to pump it ?
Note : I believe this technology of pump is not the right one for this application . If the diaphragm is damaged you will have to manage the spill , the odor ,etc
my 2 cents
Breizh
Edited by breizh, 04 June 2017 - 03:06 AM.
#3
Posted 03 June 2017 - 07:45 AM
Hi,
Are you sure that the NPSHA is -2.36 m in your case?
I believe that it is something around (-)1.3 m according to your data.
Anyhow, in addition to Breizh's comment, You may select a pump with NPSHr as low as possible.
#4
Posted 07 June 2017 - 05:53 AM
#5
Posted 07 June 2017 - 08:29 AM
Hi Rakesh,
Anyhow, the client should cooperate with you to overcome this issue.
I did not say that you should buy a PD pump which has -1.3 m NPSHr. I mean as a method, a low-NPSH pump can help.
I suggest you to provide a detailed data sheet for the pump and let vendor to recommend depending on your application.
By the way, have you checked that if the Ammonia can be transferred by other types of the pumps, for instance, centrifugal one?
In some cases by providing an inducer at the suction or using VS pumps, the NPSH is compensated.
Edited by Mahdi1980, 07 June 2017 - 08:42 AM.
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