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help, safe pressures

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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help, safe pressures

Unread postAuthor: jonpo » Tue Dec 02, 2014 7:55 am

hey all, very new to the crafting of pcp airguns
abit of a noob question (I know), but how effective would galvanised steel pipe be as an air reservoir, filled with O2 using a shock pump? on average what pressures can I reach safely? I like being alive so I thought Id ask the experts :bigsmurf:
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Re: help, safe pressures

Unread postAuthor: bravootome » Tue Dec 02, 2014 1:29 pm

jonpo wrote:hey all, very new to the crafting of pcp airguns
abit of a noob question (I know), but how effective would galvanised steel pipe be as an air reservoir, filled with O2 using a shock pump? on average what pressures can I reach safely? I like being alive so I thought Id ask the experts :bigsmurf:


how much pressure does your shock pump goes to ?. What are the sizes of the pipe, and how will you "seal" the pipe.....
Generally It will go to 60 bar with no problem..........

ANd how will you pump O2 with a pump ?
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Re: help, safe pressures

Unread postAuthor: mark.f » Tue Dec 02, 2014 7:55 pm

Hopefully by O2 you really mean "air", as any homemade pressure vessel and pump utilizing pure oxygen would be extremely dangerous unless built with the proper seals, lubricants, and connections. There are numerous horror stories about pressurized oxygen in incorrect or outdated vessels.
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Re: help, safe pressures

Unread postAuthor: jonpo » Wed Dec 03, 2014 7:00 am

how much pressure does your shock pump goes to ?. What are the sizes of the pipe, and how will you "seal" the pipe.....
Generally It will go to 60 bar with no problem..........


shock pump said to reach up to 800 psi, pipe has a diameter of 15mm with a length of 40cm. sealed with brass end caps, one brass capped end will be capsuled in epoxy.

ANd how will you pump O2 with a pump ?


I will be using a shock pump

mark.f wrote:Hopefully by O2 you really mean "air", as any homemade pressure vessel and pump utilizing pure oxygen would be extremely dangerous unless built with the proper seals, lubricants, and connections. There are numerous horror stories about pressurized oxygen in incorrect or outdated vessels.


yes, I do mean air. what exactly is a 'proper seal', connection' ? currently using brass connections with nylon tape. sorry for all the questions, just am very keen to get this right
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Last edited by jrrdw on Wed Dec 03, 2014 3:46 pm, edited 1 time in total.
Reason: Double post, fixed quote tag.

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Re: help, safe pressures

Unread postAuthor: bravootome » Thu Dec 04, 2014 2:05 am

800 psi will work with no problem. Anyhow, you must worry about the rest of the gun too.
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Re: help, safe pressures

Unread postAuthor: jonpo » Thu Dec 04, 2014 6:35 am

thank you very much for the clarification, rest of the system is proving to have no problems so far.. will stay posted! cheers
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Re: help, safe pressures

Unread postAuthor: mark.f » Thu Dec 04, 2014 7:18 am

jonpo wrote:what exactly is a 'proper seal', connection' ? currently using brass connections with nylon tape. sorry for all the questions, just am very keen to get this right


I was referring to the proper seals for oxygen, which are rated for oxygen service. :P

I you're using air, you're doing fine.
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Re: help, safe pressures

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Re: help, safe pressures

Unread postAuthor: jonpo » Sun Dec 21, 2014 6:44 am

hey guys, quick question, do you know of any compact 1/4 inch high(ish) pressure regulators I can find? or of any ways to bulild a homemade one?
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