Im getting confused

[Mikeflys]

I have asked a similar question before but I am getting  a little lost. Please be paitent with me, must be a little slow. To be spacific. For a Mrod .22. How many fills can I expect from a 95 cu ft bottle, According to the crossman calculator a 90cu in carbon fiber 4500 bottle will get me about 10 fills. When I input for the scuba tank it says 0 fills. I must be doing something wrong.

[Geoff]

http://www.airgunsofarizona.com/Tanks/FillCalc.html

guess a 3k fill on the gun and shooting down to 2k - 61 fills if your tank is filled to 4500 psi

you can plug numbers on the above

[rsterne]

If the SCUBA tank is 3000 psi and you want to fill your gun to 3000 psi, then zero fills is the correct answer....

Bob

[aack73]

As Bob stated 0 maybe 1 fill. then the max pressure on the gun will only reach the max pressure in the tank. it will drop a little every time. you cold get a few useful fills from it but not to 3000 psi.

Ideally you want a 4500 psi tank.

[Mod90]

And the bigger the tank @ 4500 psi the more fills you get

[Mikeflys]

Thanks for the replys. I still must be missing some bit of information, something just isn't lining up for me. I understand the superiority of a 4500 tank. But I constantly read of people using scuba tanks to fill there guns. Are they just not filling to 3000? According to Pyramid air website the maruader shoots best from 2600 and below. So is that the key to using a scuba setup, only filling to 2600?

[Yarp]

Using the link put up by Geoffrey_K:
An 80 cu ft SCUBA tank over-filled to 3200 psi will fill a marauder from 1800 to 2600 38.8 times

[Mikeflys]

Ah ha! Now I get it! The light finally came on. Thanks for the help. I could afford the little 90 cu in 4500 bottle but that would be pushing the budget to the limit. 10 fills is not that much. A scuba tank might be big and heavy but it sounds like the more practical of the two.

[Yarp]

To put this in perspective, Mac1 (on this site) has 4500psi 60-minute SCBA tanks with four years left and current hydro for $200 shipped. Another seller here (classifieds) has fill kits for $120. (total =  $320.00) Tommy at Mac1 says that his tanks will go fast.   

The above rig, charged to 4500psi will fill your Marauder from 1800 to 2600 about 92 times. 

[Mikeflys]

There you go muddying the waters for me! OK I will do more research. Here is a question,  can a dive shop fill a 4500 scba tank? I am not yet ready to buy. Trying to sell a guitar to raise the cash.

[travels4fun]

There you go muddying the waters for me! OK I will do more research. Here is a question,  can a dive shop fill a 4500 scba tank? I am not yet ready to buy. Trying to sell a guitar to raise the cash.

Some dive can fill to 4500 psi and  some only to around 3600 psi. Your best bet is to call around and don't forget to ask what they charge per fill.  Any paintball store can fill your tank to 4500 psi as long as you have a DIN to Male Foster adapter or a Male-Male foster adapter. If you take your tank in, they'll show you what you need if they don't already have it. a male-male foster is like $15.

Also, here is a link to a 106cf 4500 psi scuba tank if you want to go large. http://www.diveseekers.com/Luxfer_Limited_106_CF_Composite_Cylinder_LALW106_p/lalw106.htm

[Yarp]

There you go muddying the waters for me! OK I will do more research. Here is a question,  can a dive shop fill a 4500 scba tank? I am not yet ready to buy. Trying to sell a guitar to raise the cash.

Alternatives, not mud.
My usual shop leaves me with 4200-4300psi after my tanks cool down.
Find an air source before you buy. 

[Lostcoast]

To put this in perspective, Mac1 (on this site) has 4500psi 60-minute SCBA tanks with four years left and current hydro for $200 shipped. Another seller here (classifieds) has fill kits for $120. (total =  $320.00) Tommy at Mac1 says that his tanks will go fast.   

The above rig, charged to 4500psi will fill your Marauder from 1800 to 2600 about 92 times.

Yarp do you have a link to Tim's SCBA tanks? I've been checking his http://www.mac1airgunshop.com site but do not see any SCBA thanks for sale. Maybe I'm on the incorrect website.

[Yarp]

To put this in perspective, Mac1 (on this site) has 4500psi 60-minute SCBA tanks with four years left and current hydro for $200 shipped. Another seller here (classifieds) has fill kits for $120. (total =  $320.00) Tommy at Mac1 says that his tanks will go fast.   

The above rig, charged to 4500psi will fill your Marauder from 1800 to 2600 about 92 times.

Yarp do you have a link to Tim's SCBA tanks? I've been checking his http://www.mac1airgunshop.com site but do not see any SCBA thanks for sale. Maybe I'm on the incorrect website.

It's his second post.
http://www.gatewaytoairguns.org/GTA/index.php?topic=75468.0

[Lostcoast]

Great - thank you.

Regarding SCBA tanks - do they have different lifespans? I thought they were all 15 years in terms of the time span that they can be hydro approved.

[Yarp]

In the US, carbon-composite SCBA tanks are good for fifteen years from the date of manufacture and have required hydro tests every five years. Most tanks for sale at bargain rates have shorter life spans due to previous use and/or storage time.

The new 106cf 4350 psi fiberglass reinforced scuba tank suggested by travels4fun has the same lifespan but with hydro tests every three years. It's far less expensive than a newly-manufactured carbon-composite SCBA tank.

[Lostcoast]

In the US, carbon-composite SCBA tanks are good for fifteen years from the date of manufacture and have required hydro tests every five years. Most tanks for sale at bargain rates have shorter life spans due to previous use and/or storage time.

The new 106cf 4500 psi fiberglass reinforced 4350 psi scuba tank suggested by travels4fun has the same lifespan but with hydro tests every three years. It's far less expensive than a newly-manufactured carbon-composite SCBA tank.

So if I am understanding correctly, the shorter lifespan of bargain rate tanks is due to them being in poor condition and not being able to pass inspection? If a bargain tank was in great visual condition, would it be good for its 15 yr lifespan? The attraction to me of the SCBA tank is its portability as well as its price. The 106cf tank sounds like a great deal but would be a beast to haul around and would necessitate me getting a smaller tank in addition to the larger one...

Thanks,
Kevin

[travels4fun]

No. All Carbon Fiber tanks get a 15 years certification in the US starting the moment they are manufactured and stamped with the month and year they were made. A tank can look brand new and be 14 years old and still only have 1 year of legal life remaining. What happens after 15 years is that dive shops won't fill your tank as they could face penalties and fines if caught filling an expired high pressure tank. The same goes for hydrotesting, if your bottle doesn't get a stamp showing it has been hydrotested every 5 years, the dive shop won't fill it. Hydrotesting costs $20-25 and is no biggie.

The takeaway from this is that the older the CF bottle, the less years you can use it. It has nothing to do with how it looks on the outside.

[Yarp]

No. All Carbon Fiber tanks get a 15 years certification in the US starting the moment they are manufactured and stamped with the month and year they were made. A tank can look brand new and be 14 years old and still only have 1 year of legal life remaining. What happens after 15 years is that dive shops won't fill your tank as they could face penalties and fines if caught filling an expired high pressure tank. The same goes for hydrotesting, if your bottle doesn't get a stamp showing it has been hydrotested every 5 years, the dive shop won't fill it. Hydrotesting costs $20-25 and is no biggie.

The takeaway from this is that the older the CF bottle, the less years you can use it. It has nothing to do with how it looks on the outside.

Nicely said.

[Lostcoast]

Thanks for the clarification, Travels. Now I get it.