Cornell ammonia liquid pump
4 stars based on
Cornell Liquid pumps using way to much oil!?!?!?! Starting last October the Cornell pumps started consuming oil at a rate greater then normal. If we cornell ammonia liquid pump the reservoir it will go for about two weeks and then start slowly ramping up the amount it consumes. We have had some black stuff stuff show up cornell ammonia liquid pump rebuilding it. We have tried external nitrogen pressure to the back side of the plunger as well as a Hansen strainer on that line as well.
We have data logged the vessel suction pressure, pump discharge, vessel level, and Hansen HMMR position and everything is very very stable. There are pump guardians on the pumps that never trip the pumps off. We tried a larger minimum flow bypass line thinking cornell ammonia liquid pump wasnt big enough for low production days but that made no difference. The customer is getting pretty fed up with buying as much Cornell oil as they have had to and are really looking to resolve the issue.
The last thing we are going to try is take an ammonia sample and see how contaminated it is. Possibly their charge is very dirty and causing contaminants to get into the seal? The shaft seals have not been a problem what so ever throughout the whole ordeal. I have cornell ammonia liquid pump similar issues with Cornell pumps in the past and I have found that the main problem is the operator.
I have watched the operators add oil to the reservoir when needed and they do it incorrectly. They do not leave the vent screw at the top of the reservoir cracked open when pumping in oil and it leads to reservoir over-pressurization and the o-ring being moved from it seat. Worse case is it leads to a ruptured shaft seal. Perhaps this is your problem. If oil is being added properly then perhaps the o-rings are not standing up to the ammonia and ones made of something else should be considered.
You could always try a different oil. MillerRefrig, You mention the reservoir uses oil so where does it go? Common problems can be using wrong viscosity cornell ammonia liquid pump for especially low temp application. Oil heater in seal chamber not working, must work all the time.
Also as Passandscore has mentioned filling procedure. Thanks for the replies. We have been discussing this problem for the last hour with our 4 techs. The oil has to be going thru the inner shaft seal on the impeller side as its not coming out the motor side. We see black crap in the spring side of the reservoir but don't seem to see any on the oil side.
The best we are figuring at this point is the system is contaminated enough that when the pump is cornell ammonia liquid pump it is getting a piece of contaminants between the seal mating surfaces causing it to start cornell ammonia liquid pump the oil?
Like I said before we have rebuild the reservoir and it will go almost exactly two weeks and then begins using oil. The operator has to add oil daily once it starts. WE have pressure tested the shaft seals and they always test good but that's just a stationary test, possibly when running the inner seal is getting enough contaminants in it to allow the oil to leave?
We have just been grasping at straws with this. We have a ammonia sample kit coming to cornell ammonia liquid pump what we find with that. Not sure how the customer is going to feel about the high price of some kind of filter system for the ammonia if the test comes up with a lot of contaminants.
Regarding lubrication oil for pump I can accept request for lower oil viscosity because refrigerant pumps are working cold, but nothing special I have a a lot of experience with Cornell 2CB pumps. First off, Josip is incorrect cornell ammonia liquid pump the oil. ISO 68 Capella is a high temperature lubricant cornell ammonia liquid pump not suitable for most liquid pump applications due to it turning to sludge at low temps. I always use Camco B, which is recommended by Cornell.
Looks like water its so thing at cornell ammonia liquid pump temp. You have leaking shaft seals. It's a double mechanical seal. One seal is inbetween atmosphere and the oil "pocket" and then there is another seal inbetween the oil "pocket" and volute. If you have never changed one of these before, I can't stress to you how important it is to be thorough and clean. Cornell has a video they give cornell ammonia liquid pump for free on seal changes, just follow it.
Use STP and compressor oil. ISO 68 Capella is a high temperature lubricant and not suitable for most liquid pump applications due to it turning to sludge at low temps Don't worry Josip. Not only is Ibig chill accusing cornell ammonia liquid pump of saying something you have not! He has his facts all wrong. Because if you check Chevron's website who manufacture Capella They describe it as a Low temp compressor oil. Ibig chill, if you want to take part try and get your facts correct.
It is a mineral sae68 oil and you are recommending adding a PAO oil, which is not a good combination. It would appear that I have my facts wrong because if you read the link supplied by passandscore ISO68 is not recommended. For that iBigchill I appologise. I have been in many plants that use 68 in their Cornell pumps without problems.
I have been to the Cornell factory many times. I discussed it with an Engineer there one day. He definitely recommends the thinner oil. That being said I have been in many NH3 plants that use 68 in their Cornell pumps without problems, low and high temp both. It has never been a issue. Several years ago I rebuilt two pumps that had the reservoirs filled with They were run with one cornell ammonia liquid pump standby. The operating pump seal began to lose oil after four years constant duty.
I made up two caps that would fit on the Weatherhead fittings on the seal itself so I could pressurize the seal chamber with N2. A good new seal will hold most of the gas pressure overnight. It also give you the ability to increase the pressure on the seal to seat it if need be. The one thing I was always concerned about is cornell ammonia liquid pump if the seal heater failed the seal pump might be damaged or the seal might lose adhesion to the shaft or other bad things on startup with the thicker oil.
I think seal faces will tear or be damaged on start up with low viscosity oil. Heater is important on low temp. Also correct seal has to be installed, bronze on ni-resist steel face.