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Need new floor 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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Need new floor pump

Unread postAuthor: BeaverRat » Thu Aug 26, 2010 11:37 am

Well, my bike pump broke yesterday, so I'm looking for a new one. I would love to take this as an opportunity to get one capable of high pressures. Anyone have a suggestion of a floor pump capable of at least 250 psi that is under 100 dollars?
Thanks
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Unread postAuthor: SpudBlaster15 » Thu Aug 26, 2010 1:22 pm

The Topeak 3 stage 260psi floor pump is good, as is the Serfas FMP-500. They're both a bit pricey, but well under $100.
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Unread postAuthor: BeaverRat » Thu Aug 26, 2010 3:24 pm

Thanks, I did prior research on the topeak and found it had some issues, but the serfas FMP-500 looks great. It has fabulous reviews too.
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Unread postAuthor: clemsonguy1125 » Thu Aug 26, 2010 3:38 pm

If you really want to be cheap, you could build one from home depot pars for well under those prices. And it would be capable of 300 psi if you build it from Gippetos plans.
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Unread postAuthor: Gun Freak » Thu Aug 26, 2010 4:12 pm

I agree with CG, go ahead and build one. For the same price you can make one that can achieve twice the pressure.
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Unread postAuthor: SpudBlaster15 » Thu Aug 26, 2010 4:25 pm

Gun Freak wrote:For the same price you can make one that can achieve twice the pressure.


Twice the pressure, at the cost of half the volume per stroke.

A commercial high pressure floor pump provides a good balance between the two competing factors.
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Unread postAuthor: Gun Freak » Thu Aug 26, 2010 4:40 pm

You're missing the point though. Twice the pressure, half the volume, still gives you the option of higher pressures, 500 psi+. I agreed with CG's suggestion because he can achieve higher pressure with a homemade stirrup pump.
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Unread postAuthor: SpudBlaster15 » Thu Aug 26, 2010 5:01 pm

Twice the pressure capability and half the pump volume still gives you... wait for it... half the airflow per stroke. That means it will require twice the time and substantially more effort to fill to any given pressure.

You wouldn't fill a 20 gallon chamber with a shock pump, would you? Finding a balance is key. The OP indicated a desired pressure of 250PSI, and I provided links to the pumps which would most efficiently move air at up to said pressure.

If one is looking to reach 500PSI+ at any significant volume, a floor pump is not the answer. In that case, either buy/rent an industrial nitrogen tank and regulator, or build a hybrid.
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Unread postAuthor: clemsonguy1125 » Thu Aug 26, 2010 5:52 pm

But if he decides to build one he can build a slightly thicker pump that gippetos and achieve those pressures.
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Unread postAuthor: Lockednloaded » Thu Aug 26, 2010 8:05 pm

moving up to 1" copper would probable be about as expensive as the pumps linked. BTW what kind of pressures could a pump housed in 1" copper pipe reach?
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Unread postAuthor: Gun Freak » Thu Aug 26, 2010 8:13 pm

It depends on how much you weigh. If you weigh 100 pounds then it can do roughly 314 psi, and if you weigh 200 pounds then it can do over 600 psi. I would guess you weight about 150 pounds so probably an absolute max of 450 psi.
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Unread postAuthor: clemsonguy1125 » Thu Aug 26, 2010 8:53 pm

Well there are several other choices, personally I'm a fan of the steel ema conduit pipe.
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Unread postAuthor: BeaverRat » Thu Aug 26, 2010 9:01 pm

Thanks guys, I decided to order the serfas pump, I only need to be able to reach 250 with that one. For the higher pressures, I have a fridge pump in the making.
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Unread postAuthor: Lockednloaded » Thu Aug 26, 2010 9:02 pm

if I ever make one I will use sch 80 1" PVC and galvanized fittings. If thouse parts and a check valve are available at your hardware store beaver rat, then you could make a pump for < 50$
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Unread postAuthor: clemsonguy1125 » Thu Aug 26, 2010 9:13 pm

Well good luck, let us know how it performs.
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