Liquid Ring Vacuum Pump Questions
Liquid Ring Vacuum Pump Questions
(OP)
I work in a hospital and we are having problems with our medical vacuum system.
The system is made up of three Beacon MedAes Camel (camel back?) units with Nash liquid ring vacuum pumps.
My first question is about the water supply. We are using unsoftened city water and in a short period of time all three pumps have frozen up and we have had to de-scale the pumps using Rydlyme.
Last night we installed a Descalamatic to help with the water hardness issues. Is this the right application for a Descalamatic?
Do they work as advertised?
Currently pump 3 is timing out and going into alarm. This happens right before they freeze up. There is a fitting on the inlet side of the pump that looks like a relief valve. It has holes at the bottom and when the pump is activated it starts sucking air. The same fitting on pump 2 is starting to do the same.
What is the purpose of the fitting and is the air intake related to the scale build up in the pumps?
As you can tell I'm not an expert on these pumps and any troubleshooting and maintenance info would be greatly appreciated.
The system is made up of three Beacon MedAes Camel (camel back?) units with Nash liquid ring vacuum pumps.
My first question is about the water supply. We are using unsoftened city water and in a short period of time all three pumps have frozen up and we have had to de-scale the pumps using Rydlyme.
Last night we installed a Descalamatic to help with the water hardness issues. Is this the right application for a Descalamatic?
Do they work as advertised?
Currently pump 3 is timing out and going into alarm. This happens right before they freeze up. There is a fitting on the inlet side of the pump that looks like a relief valve. It has holes at the bottom and when the pump is activated it starts sucking air. The same fitting on pump 2 is starting to do the same.
What is the purpose of the fitting and is the air intake related to the scale build up in the pumps?
As you can tell I'm not an expert on these pumps and any troubleshooting and maintenance info would be greatly appreciated.





RE: Liquid Ring Vacuum Pump Questions
They have good info.
You need good quality water that is as cold as possible.
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Plymouth Tube
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
I thought this might be different.
RE: Liquid Ring Vacuum Pump Questions
You'll need softened water that is cold, as stated above.
Is it possible to replace these pumps? I've only used a few liquid ring pumps, and I never had them sucking air from a housing fitting.
How much vacuum do you need to pull? How often..? What kind of loading?
RE: Liquid Ring Vacuum Pump Questions
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The fitting is either an anti-cavitation valve or an automatic drain valve.
RE: Liquid Ring Vacuum Pump Questions
The bottom line is that the devices tested did not work as advertised. I'll forward the link to our CE. Hopefully this will lead to us installing a real water softener, filters and a pressure regulator.
Pump 3 froze up again two nights ago leaving us with two pumps that have to be scaling up as we speak.
Ports, if it was up to me we would have had a Nash rep on site a long time ago. It looks like short term savings is winning out over long term savings.
We maintain 22" with set points of 19" and 24". The pumps cycle continuously with roughly a five to six minute run time. As soon as a pump shuts off it takes about two minutes for the vacuum to reach the 19" set point.
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
When I used a liquid ring pump, we did a once through on it.. all of the water went straight through to the drain. *Research is wasteful.
In his case.. are they recycling the water back to a tank, and you're thinking of a flush cycle or blowdown on that tank?
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
RE: Liquid Ring Vacuum Pump Questions
Pump 2 froze up several weeks ago and the powers that be decided to rent a Busch just like ports suggested.
Last I heard they were getting bids on replacing all three pumps with Busch pumps.