Self-venting pump
Self-venting pump
(OP)
Hi
Can anyone please give specific configuration of a centrifugal pump that is self-venting?
API 610 states that all pumps shall be provided with vent and drain connections, except that vent connections may be ommitted if the pump is made self-venting by the arrangement of the nozzles.
What kind of nozzle arrangement is it exactly?Can a overhung end-top nozzle pump with discharge nozzle through pump casing centerline like the ones in ASME B73.1 be self-venting?
Thank you for your help.
Can anyone please give specific configuration of a centrifugal pump that is self-venting?
API 610 states that all pumps shall be provided with vent and drain connections, except that vent connections may be ommitted if the pump is made self-venting by the arrangement of the nozzles.
What kind of nozzle arrangement is it exactly?Can a overhung end-top nozzle pump with discharge nozzle through pump casing centerline like the ones in ASME B73.1 be self-venting?
Thank you for your help.





RE: Self-venting pump
API Standard 610 considers a pump to be self-venting "if the nozzle arrangement and casing configuration permit adequate venting of gases from the first-stage impeller and volute area to prevent loss of prime during the starting sequence."
http://centrifugal-pump.org/glossary_S1.html
RE: Self-venting pump
Sometimes venting is more important in some cases,
API 610 11 says:
6.4.3.14 All pumps shall be provided with vent and drain connections, except that vent connections may be
omitted if the pump is made self-venting by the arrangement of the nozzles. Pumps that are not self-venting shall
be provided with vent connections in the pressure casing, as required (see 6.8.10).
So there is no mandatory to be selfventing in API610 11 edition.
Talking about OH2 pump type, Selfventing will have vertical centerline top discharge nozzle.
Non-Selfventing will have vertical tangential discharge nozzle.
I hope this helps.
RE: Self-venting pump
With the little brain that I have, my understanding is that in-line pumps like OH3 & OH6 will be not self-venting. Am I correct?
Knowing that the pump is OH2 type, should it mean that we specify vent connections in the data sheet especially during FEED engineering even if we do not know yet the orientation of the discharge nozzle if it is centerline or tangential?
Thanks
RE: Self-venting pump
RE: Self-venting pump
RE: Self-venting pump
Thanks for your help. I agree with you.
RE: Self-venting pump
You are right, in in-line vertical pumps, it is mandatory to vent the pump, to be clear, to vent seal chamber for preventing air burble formation on mechanical seal faces that could damage them.
Some API Plans , like 14 in my expecience in in-line vertical pumps, help to do that in addition to lubricate and refrigerate seal faces.
I hope this helps.