Pump for Ammonia Transfer System

[gwapa]

Dear friends
I am looking a ammonia pump for:
3m3/h
h= 2,5 bar
NPSHD 0,45 m

Which type of pump meets this conditions
Please watch the NPSHD
Regards
Gwapa

[Peter_1]

I should heck once the website of http://www.th-witt.de/witt/index.php?treeid=190&sprache=uk or http://www.vikingpump.com/en/products/seriesDisplay/internal/ammonia.html

[gwapa]

Thanks Peter 1
I think that with a NPSHA of 0,45 m the pump should be a gear or vane pump. doesn't it?

This gear or vane pump came in hermict type model?

Thanks again Peter 1

[sterl]

Low NPSH avail will lead you to low speed gear pump (or potentially vane; only one I know of in refrigerant use is the Blackmer and generally they are much larger than this duty...and do not work so well slowed down).

There are plenty of gear type, mag coupled pumps and some will work at low NPSH if you slow them down a level of motor speed. At 900 RPM/60 Hz liquiflow can provide an all-stainless pump with just about the right flow and head.

With all gear pumps: They don't tolerate metal fines. With these pumps: You largely do not repair them they are a one-lifetime arrangement...So slower is better.