Jetsam Boost Pressure

dnscarboro

New to rebreathers/boost pumps- so I am looking for any help I can get.
New Pump arrived: Jetsam Nano
Hook up with with SS whip kitsand Quick Connects-
Source O2 2000psi
No drive Gas-hooked up(yet)
Fill bottle open (450psi)
Open valve on supply- tanks does not equalize???? Shouldn't they equalize like a regular fill whip?
apply drive gas- pumps to 750psi and stales.

I called Friday - Factory said check whips for blockage???? OK
No blockage- hook together (take pump out of loop) equalize fine! (not whips)
Ok now with equal pressure I apply 147psi drive gas pump starts,
pumps 2 minutes to 2150 and stales
Try another tank- pumps to 2700 stales!
another tanks pumps to 2100 stales!

Supply is now 1851
drive 147 regulated- oil/water filtered
Any suggestions????
Can't get pressure over 2100 now in any tank.
Where should I start looking?
Pump is 3 days old I hate to take apart? Return to seller?
Return to factory? IN USA so freight to Canada plus all the forms????
Are am I doing something wrong!!!. It was my understanding I could pump to 3000PSI? Am I wrong in this?

Thanks for any help!

Lancer4545

I know this might sound obvious but are you sure you have the supply and filling tanks connected the right way round.

A quick test........connect the supply tank and do not connect the whip to the tank you want to fill and open the supply valve. There should be a free flow of gas from the whip, confirming the direction of flow.

If not......Connect the now free hose to the supply tank and try again.

If there is still no free flow there is either a blockage in one of the whips or you have a problem with the booster.

Regards,

Lance

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sunnyboy

The Jetsam should operate as a perfectly good transfill whip with drive gas disconnected IF the connections are correct and there is no blockage.

As a test, connect your supply tank to the DIN fitting that does not have the pressure guage. Close all bleed valves and then open the transfill valve near the pressure guage. Now slowly crack the supply tank valve. You should have gas flowing freely out the free DIN fitting by the pressure guage. If you do not have gas flowing, there is a problem.

P.S. I do this every time I fill/boost O2 in order to purge air out of the lines, so I know it works.

I use my Jetsam sometimes just as a transfill whip, and sometimes to boost. It all depends on supply tank pressure and what pressure I want in the receiver tank.

Cheers,

-S

dnscarboro

Thanks for the help,
I did make sure of the direction of flow, it just barely comes out with
2000 psi supply Open. (checked it second- first make sure I had new supply bottle- I thought they left me an empty one...)
This confirms it: something in the pump (or filter) Just wanted to make sure.
I do not feel I should take apart a new pump! But I might need the practice in case Curt every ask me to be a tank totter on one of his trips!!!.

dnscarboro

What can you pump a 27 steel up to? (o2)

diverreb

10% overfill shouldn't be a problem. When I used the 27's, before switching over to the lighter AL 20's, I pumped them to 3,000 psi a few times, but then realized it really wasn't necessary for most situations. Unless you are doing multi day dives and have no access to gas why stress the tank and expose yourself to some of the risks of pumping HP O2.

Now with the AL 20's I have to pump them up as they are 3,000 PSI tanks. I like the trim and feel underwater much better than the Steel 27's, but the downside is the # dives per fill drops off.

I have a Haskel Mini Booster and it's great for getting a lot more use out of your fill bottles. It pumps my tanks up to 3350 PSI max.

Richie

sunnyboy

I don't know about steel, but I've been pumping both my 6cf inflate bottle and my two 19cf Rebreather tanks (all aluminum, 3000 PSI) to 3100 PSI without any problem, whether using a 80cf bottle and reg as drive gas or my new compressor (Dewalt, 150 psi). Supply gas has so far been as low as 1500psi and it takes about 20 mins to pump that to 3100 into a 19cf tank. As my supply gas pressure continues to decrease, times will be longer. There comes a point where you really don't want to try and boost a low supply gas pressure to 3000, but I'm not sure what that mark will be for me. Not theory, but the actual "I'm really tired of waiting for this so XXXX psi will be enough for today".

-S

dnscarboro

Thanks for the info, as of today I have broke everything down for cave trip this weekend. I would be intrested in the Dewalt compressor (Model) hook up type?. I have an RMA to return pump to factory for test. If I can get anyone to look at this weekend it would save the shipping to Canada. I am using the reg and bottle now and get the most I can get is 2400 now. I am starting at 1800 now in supply bottle. Little concerned about putting this kinda of money out if I am only going to get 2400--I was think I should be able to pump to 3000 at least??? Using my compessor 2hp 150 PSI 33 gallon
I can't get 2100. Not sure what is going on. I thought drive gas is drive gas
150psi is 150 psi...
Thanks for all the help

sunnyboy

Sent you a PM with a link.

-S

teksimple

Sounds like something is binding the piston (teflon tape?) so that it cannot get all the way to the end to exhaust. Until I permanently attached my source gas adapters onto Swagelok fittings where I did not have to use teflon tape anymore, that was not uncommon.

Really, taking the thing apart is easy. Put it on some clean paper towels (wash your hands, too!) and use an Allen key to pull off the brass head. Inspect inside. Unclip the polyethylene tubes so that you can pull out the piston and relube with the less thick type of O2 compatible lube. Once you take it completely apart (just a few minutes), you won't have to refer to the manual again.

Gordon designed this thing so easy to service that the nano booster makes idiots look like expert field engineers.

Yours truly,
expert field engineer

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