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-   -   Scuba HPA (http://www.spyder.tv/forums/showthread.php?t=18620)

deano 177 10-23-2008 08:24 PM

Scuba HPA
I found a tank on craigslist.com for $75 and the fill adapter on ebay for $35. Has anyone got a setup like this? How many fills can you do? I've heard maybe 4 good fills and two ok fills....

xsvly-fat 10-23-2008 08:55 PM

Re: Scuba HPA
It depends on how big the scuba tank is, I have one that fills about 2000 psi and I can get about between 3-5 good fills. With my Mini me and my dad would fill up our smaller tanks and the scuba and it would last us all day.

deano 177 10-23-2008 08:59 PM

Re: Scuba HPA
cool. This tank is a 3k tank. 80cu ft.

:: goes to search for online fill calculator ::
:: finds fill calc::

80 cu ft = 960 cu in @3000 psi = 12960 shots...:)

DFSniper 10-23-2008 09:34 PM

Re: Scuba HPA
hmm, i get about 1000 shots out of a 48/3k with my timmy, w/psi at about 70. whats the vs3 run at, 250 psi? ugh, its too late and im too tired to do the math...

deano 177 10-24-2008 10:13 AM

Re: Scuba HPA

Originally Posted by DFSniper (Post 222434)
hmm, i get about 1000 shots out of a 48/3k with my timmy, w/psi at about 70. whats the vs3 run at, 250 psi? ugh, its too late and im too tired to do the math...

VS3 is now a loaner... I'm primarily runnin' with my mini. I can get close to 1500 shots if my 68cuin has 4K in it. No one around here can get you up to 4500. Its usually around 4K from the pb shop but then the tanks cool and they drop. My roomie just went and filled our 4 tanks at the shop and only 2 are above 3K. Part of the problem is that they are lazy at the shop and won't fill from the full tanks. I guess they only have one fill valve so go figure...

Griff 12-07-2008 12:25 AM

Re: Scuba HPA
I have my local shop set so that if they fill bellow 4000 I only pay 3/4 of what they normally charge. if they can't get me obove 3000 it 's free.with my 4500psi 68cui Tank.

battlechaser 12-07-2008 07:52 AM

Re: Scuba HPA
Remember too, the max PSI per fill goes down as you start filling your PB tank, so your first fill might be in the neighbourhood of 2900-3k psi, but your next will be around 27-2800 psi and so forth.

Griff 12-07-2008 08:57 PM

Re: Scuba HPA
true, but my local shop has mutipual tanks and there own compressor that goes to 4500 why should I pay full price for less than a 3/4 fill. If the shop has the gear to mantain allmost full fills. I work hard for my money,and I have a tuff time paying for things I don't get.

Erlkonig 09-10-2009 12:00 PM

Re: Scuba HPA
I have been doing some reading and they say one of the best ways to do it yourself and maintain decent pressures for each fill is to set up a 2-3 tank cascade system...

They figure filling a 3k tank will result in a rough Scuba tank pressure drop of 200psi. So you hook up to tank #1 and the two bottles equalize at ~2800psi. You then hook up to the second tank and they equalize at ~2980. The next fill the first bottle equalizes at ~2600psi, then the second would bring you to ~2950 or so...They say this method with three tanks would get you in the neighborhood of 20-25 fills...Following is the link to where I found my info...


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