Highest pressure on a hand-powered pump?

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saefroch
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Sat Oct 23, 2010 8:22 pm

No, I don't mean to imply that there is a maximum pressure one can reach with a hand-powered pump. If there is one it's insane.

The question I have for all of you is this: What is the highest pressure anyone on Spudfiles/you have achieved with a manually-powered pump?
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Necrosis
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Sat Oct 23, 2010 8:30 pm

240 bars. Around 3500 psi.

allthough a bloody scuba bottle is much handier if I say so myself...

http://www.pyramydair.com/s/a/Air_Ventu ... reads/2762

Not quite the same pump (I think it was using a gehmann or FX pump but yeah..)


'tis quite a workout too..
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saefroch
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Sat Oct 23, 2010 8:38 pm

Any idea what the diameter of the head on that pump is?
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c11man
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Sat Oct 23, 2010 8:44 pm

i have only reached the limit of my gauge at 600psi, but i took it apart as soon as i got my ac compressor
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Matt_NZ
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Sat Oct 23, 2010 8:45 pm

saefroch wrote:Any idea what the diameter of the head on that pump is?
This Link will help

It looks to be around 20mm.
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Ragnarok
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Sat Oct 23, 2010 9:19 pm

Matt_NZ wrote:It looks to be around 20mm.
Seems very unlikely.

The 20mm pump I made is only good for about 40 bar, and most of that capacity is dependent on inertia.
In other words: At about 80 kilos, my weight is only strictly enough to get 24-25 bar out of it - getting the rest involves (in simple terms) jumping heavily on it.
Which is quite a good workout actually.

A pump of that pressure is only likely to have a 5 or 6 mm head diameter.
Does that thing kinda look like a big cat to you?
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saefroch
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Sat Oct 23, 2010 9:43 pm

6mm, just checked the diagram. Converting to inches... about .236" 1/8" Sch 40 NPT has an inner diameter of about .269". I may decide to add a third stage and actually push something near it's limits. 1/8" fittings are cheap too...
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High-PSI
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Sun Oct 24, 2010 12:52 pm

I have hit 180 psi with a normal bicycle hand pump with a 1.25 inch bore.

This was pumping up a relatively large tank. So, it took a while. :)

Matt
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Fnord
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Sun Oct 24, 2010 1:49 pm

The highest I've gotten with a homemade pump is 900 psi (single stage 1/2" copper tube). It took awhile though since I think I had a dead space problem.
The highest with a 1.5"(?) bike pump was around 200psi. This is hard for me to believe since at the time I weighed about 135.
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