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Buying a HP Pump

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: ammosmoke » Tue May 13, 2008 11:22 pm

LMAO! *Drools* Would be awesome. I suppose you could open up your natural gas line. (LPG) Hardly 3000psi though. Hey... wait a second... Couldn't you fill containers like that? Quite cheap I would imagine.
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Unread postAuthor: D_Hall » Tue May 13, 2008 11:42 pm

ammosmoke wrote:LMAO! *Drools* Would be awesome. I suppose you could open up your natural gas line. (LPG) Hardly 3000psi though. Hey... wait a second... Couldn't you fill containers like that? Quite cheap I would imagine.

LOL... Well, if you look at the south side of the street in the link.... THere's about 80,000 pounds of air storage there.


So what would you guys do if I also mentioned that we have both liquid oxygen and liquid nitrogen capabilities?
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Unread postAuthor: Lentamentalisk » Tue May 13, 2008 11:51 pm

probably kidnap you and bargain your life for the entire research facilities...
...On a good day...
You are very lucky that I just finished with all of Chemistry for the year, otherwise I would probably do something involving a cheese grater... You don't want to know...

Or better yet, hose you down in liquid oxygen!
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Unread postAuthor: psycix » Wed May 14, 2008 6:40 am

We now know their location!
Lets go down there and steal one of the pumps at night....
Replace it with an air compressor so they dont notice....
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Unread postAuthor: Tom » Wed May 14, 2008 8:51 am

Yeah good plan, are you paying the tickets to America :D .
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Unread postAuthor: jackssmirkingrevenge » Wed May 14, 2008 9:05 am

MrCrowley wrote:I know JSR gets away with a shock pump, but most of his projects are quite small.


No need to compensate see ;p

But seriously, for chamber volumes bigger than a couple of cubic inches, a shock pump gets very dreary.
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Unread postAuthor: SpudFarm » Wed May 14, 2008 9:06 am

i used like half an hour to get my bike shock to 300psi..
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Unread postAuthor: watto » Wed May 14, 2008 9:24 am

I got a steel 160psi floor pump from that same site for only 20 bucks with postage! it was some kind of weekly special, I also got Carlmans pump for him, since I'm old enuf for a credit card 8)
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Unread postAuthor: POLAND_SPUD » Wed May 14, 2008 11:49 am

...or you can build a fridge compressor to get much more than 300 psi

the only drawback is that it requires electricity
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Unread postAuthor: psycix » Wed May 14, 2008 3:36 pm

POLAND_SPUD wrote:...or you can build a fridge compressor to get much more than 300 psi

the only drawback is that it requires electricity


Do fridge compressors run on "high" voltage from the power outlet? Or is there a transformer between?
If it uses 12 or 24 volt you could also run it from a car battery in the outdoor.
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Unread postAuthor: sniper hero » Wed May 14, 2008 3:46 pm

if it's 12 volt a battery from a from a drilling machine is cheaper.
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Unread postAuthor: MrCrowley » Wed May 14, 2008 3:54 pm

watto wrote:I got a steel 160psi floor pump from that same site for only 20 bucks with postage! it was some kind of weekly special, I also got Carlmans pump for him, since I'm old enuf for a credit card 8)
Yeah that's what first got my attention, they were like $14 without postage.

You can direct debit you know, deposit money into their bankout by banking online... :)
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Unread postAuthor: POLAND_SPUD » Wed May 14, 2008 4:04 pm

AFAIK fridge compressors run on 220V or 110V (depending where you live)
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Unread postAuthor: MrCrowley » Thu May 15, 2008 10:06 pm

Well the pump arrived, it's great. Get's to 260psi easily enough.

The only thing that bothers me is that the pump guage is way off. Like if I pump till the pump guage says 260psi, the cannon guage will only say about 220psi.

I've tried several guages, on several cannons and I get the same result.

Any logical explanation i'm missing out on?
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Unread postAuthor: Lentamentalisk » Thu May 15, 2008 11:29 pm

They are cheating you out of you money? Sounds logical enough to me...
send it back and demand that they pay the postage for deliberately falsely advertising.
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