Love my new 0.25ci HPA tank

Shot count stinks but it rocks at checking and adjusting regulator pressure!

My old routine involved pumping up a 13ci tank which required 3 or 4 pumping sessions.   Not only is that a bunch of work but with 20 or 30 minutes between sessions to let the pump cool down, it also took almost 2 hours to complete.  Now it takes, oh, about 2 minutes 

It's just a piece of piece of 6061 aluminum bar stock bored out to 9/16" at 2" deep and with a countersink for the regulator's O-ring to seat into, then tapped to 5/8"-18.   The neck needs some cleanup but I'll take care of that later.  That it works is most important.






Here it is in action:




Checking the output pressure of a standard Ninja regulator:




I had been thinking about making one for a few weeks but this weekend I wanted to check the Ninja SHP regulator on Vigilandy's .22cal QB79 and I decided it was time to do it.  I had initially adjusted the regulator to 1500psi and promptly had the 1.8k burst disk to rupture.  So I replaced the burst disk and took it down to 1300psi for testing.  This weekend I bumped it back up to 1500psi and...you guessed it, blew another burst disk.  Hmm, I don't know what tolerances those things are supposed to have but it's apparently very loose.  A 2k is going in next.

Before and after adjustment:






The good news is his rifle is shooting pretty hard for a 79.  With the RVA adjusted to find the max velocity:

My old routine involved pumping up a 13ci tank which required 3 or 4 pumping sessions.   Not only is that a bunch of work but with 20 or 30 minutes between sessions to let the pump cool down, it also took almost 2 hours to complete.

13 ci = 213 cc?

It shouldn't take that long to recharge.

You might need a different pump.

I pump my s510 (231 cc) in one go with my Hill pump. It barely gets warm. Only takes a few minutes.

Mike, yes on the 13ci = 213cc.

I'm talking about pumping from totally empty up to 2000psi.  No doubt a Hill is better than a Benjamin pump but when you say you are doing it in one go, are you covering that much range?

I'm pulling out the regulator guts and adjusting it...

I'm pulling out the regulator guts and adjusting it...

You adjust the regulator every fill?

If you have never tinkered with something trying to get it set just right, it involves a lot of taking it apart, adjust it, re assemble, test.
Then do it all over again until you get it where you want it.

Sometimes I thought my real job was taking apart and reassembling my air rifle.

I would be at work thinking,
 ok, if it wasn't this, then it has to be this, then when you get home, it is in front of you until you go to bed, you get to where you can assemble it in your sleep.

And you get to know every part by a four letter word first name basis..

If you have never tinkered with something trying to get it set just right, it involves a lot of taking it apart, adjust it, re assemble, test.
Then do it all over again until you get it where you want it.

Sometimes I thought my real job was taking apart and reassembling my air rifle.

I would be at work thinking,
 ok, if it wasn't this, then it has to be this, then when you get home, it is in front of you until you go to bed, you get to where you can assemble it in your sleep.

And you get to know every part by a four letter word first name basis..

So I m not the only one.... 

Where did you find a 2K burst disk ?  I have searched everywhere.  3K is the next step from 1.8K.   Thanks

Seriously though it sounds like Jason is had to adjust the SHP regulator from 1100psi to 1500psi to 1300psi back to 1500psi.  At two hours per fill,  this device will save a lot of time and backache!  Once he has the regulator figured out he won't have to take it apart again....  I hope.

Hey, I'm all for using ingenuity to make things quicker and this sounds like a useful device for such troubleshooting/diagnosis.

But I'm baffled by the two hours to fill the standard reservoir, especially if it's only going from 0 psi to somewhere under 2000 psi on a reservoir that's only 213 cc. I fill my 231 cc reservoir over that same range in under 10 minutes. The real heat doesn't happen until I pump into the higher pressures.

If it takes two hours then a new pump or a pump re-build is probably in order.

That's all I was saying, nothing against the little special purpose tank that looks like a useful thing for such purposes. It can probably be pumped from zero in a minute or so.

Jason, I am so tired of blowing the1.8k burst discs at 1400 lbs pressure that I just ordered some of the 2015 pressure discs you recommended.

I do think that the SCBA burst discs have about a 20% safety factor built into them.  The  3000 lb discs seem to blow at about 3600 pound relief pressure.  Have you tested the actual burst pressure on the 2015 discs with your arrangement?

This is a great post - I am going to the shop to build a similar test block for my use!

Roger