Closed loop, pump priming

[robert novack]

I hope this question is relevant for this group. I have a closed loop system where I am trying to pump chilled water through some equipment for cooling and then back to the chiller. I know that there are some air pockets in the chiller, but the pump suction and discharge pipes are completely flooded. Shouldnt the pump prime and allow the air to move to a location that can be vented. I cant even get my pump to prime. Is that because of the air pocket elsewhere (chiller) in the system. I deal with pumps almost daily, but I have no experience with closed loop systems. Thanks for any help.

[Kevin ReeseParticipant]

Whether the pump can evacuate air pockets depends on its head and velocity parameters. In most cases, the pumps used do not have the necessary force to push the air out of the pockets and keep them moving to an evacuation source. When this is the case, the air pockets must be removed by purging the system with a high pressure/high volume liquid source. And a closed system pump does not require priming, unless its design traps a bubble of air in the impeller chamber and it cannot be expelled. In that case, the pump should have a plug or valve at the top of it to let the trapped air out.: I hope this question is relevant for this group. I have a closed loop system where I am trying to pump chilled water through some equipment for cooling and then back to the chiller. I know that there are some air pockets in the chiller, but the pump suction and discharge pipes are completely flooded. Shouldnt the pump prime and allow the air to move to a location that can be vented. I cant even get my pump to prime. Is that because of the air pocket elsewhere (chiller) in the system. I deal with pumps almost daily, but I have no experience with closed loop systems. Thanks for any help.

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