The chiller is tremendously overpowered, I know. Evaporative cooling is the only thing keeping recovery vessel pressure down.
Besides that - there are restrictive choke points in the vapor flow that I’ll be dealing with over the next week (3/8" fittings on 1/2" lines for example - and at one point two 1/2" vapor lines are tee’d into one line)
You hit 2#/min with one or two MVP 150’s?
Single. Absolutely upgrade to 1/2” and make sure you provide enough heat. Over compensating cooling doesn’t matter if you don’t have the heat to match it.
what solvent are you using? propane?
We have too much heat - boiler can handle. Cooling side struggles - there are a couple tube & shells to put to use soon on recovery side too. LN2 if I have to …
70 propane/30 butane
Depends on my end goal. Usually straight butane or a blend
That would help for sure.
My water temp starts at 120f and by the end of recovery drops to 85f my tank psi is around 40-60 psi i run 2 30’ 3/8 condensing coils with ice water after the pump my line going to the coils is 1/2 inch . I just got some dry ice to put on my tank to drop psi . I just never had this issue before using piston pumps . The trs21 were just more bang for the buck and i didn’t have to use dry ice on the recovery side. Ultimately i got the MVP cause they’re meant for 24 hour continuous use and don’t need rebuilt as often. But my investment has been made so now I’m trying to dial everything in . I have been able to average about .7 lb per min so far . We will see how things go with dry ice on my tank. I run 70/30 iso pro blend . I had liquid solvent backfill from my tank all the way to the outlet check valve of the mvp on my first run then i set up a honey pot and bleed the head pressure on my tank and this didn’t happen again . They just can’t fight pressure at all
Oh you’re running coils in ice water for cooling on a mvp? Thats your bottleneck. Your cooling can’t nearly keep up with the amount of gas the MVP is moving. Its working against itself.
Forget about cooling your solvent tank & put all your cooling capacity (kw/hr) on a heat exchanger or coil if that’s all you got
Even running dry ice on my tank and my tank sitting at 0-10 psi and bleeding head pressure to separate honey pot its not what i expected for a 12k pump. I tried running dry ice in my coils it made zero difference . I have my co2 pressure set to 20-30 psi above my inlet pressure . I struggle to run crc with it . Its just less than desirable for me . Its decent for crude . Hot vapor loop wont work on this pump for me . Chillers , dry ice , heat exchangers where never necessary with 4 TRS pumps and i averaged 1-2lbs per minute consistently and i never had these issues so its just extra costs i have eliminated before and now i have to figure out an efficient way to run this pump without spending even more .
Not sure what the problem is. If you have sufficient heating and cooling it should be pumping for ya.
The main issue you’re having is the temp of your condensing coils. I noticed when my bucket with coils is around 20-30°f that the recovery time slows way down. If I keep the bucket in the negative temps it is pouring rain in the solvent tank. Don’t worry too much about lowering the temps of your solvent tank. Just keep the coils frozen and the returning gas will be cold enough to hold temps/pressure down in the solvent tank. The pumps are moving the gas so fast that my 240v heater can barely keep up in maintaining temps.
Actually sorry I skipped through on what you said about using dry ice in your bucket and not seeing a difference…
maybe your collection isnt producing enough vapor? how many kw’s of heating do you have? i dont know how @greggoose710 hits 2lbs a min though…never got close to that when i ised to mvp
Lots of heat and iced tech. I will say that number is mostly crude. It’s a little Bit less when running @ 100f
Update guys with ice water in the first coil then iso slurry in the second the pump rips pretty fast
I noticed when setting the co2 pressure it runs slower when we have it anything lower than 75 psi but we don’t go over 80 psi. Getting a little under a lb per minute on just tap water. Solvent tank stays at 50psi for most of the day. I like to use the pressure to move solvent around in the columns. Forgot to mention it’s the original 60psi model. We use a tube in shell condenser to condense if that helps any.
I believe i broke the shaft seal on my MVP. 150 the co2 pressure leaks out the back hole . I have the pump opened up right now and wonder what I’m looking for to confirm my diagnosis. I can readily send pictures any help would be appreciated. The parts I suspect need replacing are
109 109a 110.
