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Air Hoses safe to use at high pressure?

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Air Hoses safe to use at high pressure?

Unread postAuthor: Binary Blue » Sat Dec 22, 2012 3:27 am

Are air hoses like this:

http://www.harborfreight.com/1-4-quarte ... 97447.html

safe to use at high pressures? I know they say 200PSI max pressure, but from what I've gathered form this forum, those numbers reflect a considerable safety margin.

I'm talking abut between 100-300 PSI.

Also, would Ace Hardware or Harbor Freight sell shorter lengths of air hose? I only need a few inches, not 25 feet.

I've heard form other forums that they do, but those lengths are not listed on the Harbor Freight website and the Ace website lists nothing like that. For that matter other people have posted that Ace lets you cut and crimp your own lengths of hose.
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Unread postAuthor: mattyzip77 » Sat Dec 22, 2012 4:50 am

I think you have to buy it by the foot so buy a foot and have a spare piece... :roll:
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Unread postAuthor: Zeus » Sat Dec 22, 2012 7:17 am

Look in the plumbing section for lengths of steel braid hose with fittings on both ends, it starts from 4" and goes up to 2'.
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Unread postAuthor: Fnord » Sat Dec 22, 2012 11:23 am

First off, look for what Zeus suggested.

If you're using it to connect a pilot valve, buy a high-pressure rated length and do not exceed the rating. Hoses are not very dangerous when they burst, but you'll cause the gun to fire if it dumps the pilot volume when bursting. In many cases, metal tubing is preferable for pilot lines.

If it's a 'normal' air line where the dangers are minimal, a possible DIY solution would be to buy the best hose you can find, then wrap it in a layer of wire and apply heat-shrink tubing over that.
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Unread postAuthor: D_Hall » Sat Dec 22, 2012 1:29 pm

High pressure rated lines are not expensive... Even when built to custom lengths. Why in the world don't you (OP) just guy buy the right part for the job?
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Unread postAuthor: Binary Blue » Sat Dec 22, 2012 4:24 pm

Thanks for all the help guys!


D_Hall wrote:High pressure rated lines are not expensive... Even when built to custom lengths. Why in the world don't you (OP) just guy buy the right part for the job?



I wasn't planning to use the hose in the pilot area. I was planning on using it as a way of connecting the exhaust end of the QEV to the barrel, or just about anywhere other than the pilot end.

Brigadier General wrote:Look in the plumbing section for lengths of steel braid hose with fittings on both ends, it starts from 4" and goes up to 2'.


Do they have NPT threads on the end?
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Unread postAuthor: POLAND_SPUD » Sat Dec 22, 2012 5:16 pm

Just to remind you - try push to connect fittings and tubing >
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Awesome stuff!!

The only problem is that most of them are rated @10bar, though there is both tubing & fittings rated to 50bar
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Unread postAuthor: D_Hall » Sat Dec 22, 2012 6:38 pm

Binary Blue wrote:I wasn't planning to use the hose in the pilot area. I was planning on using it as a way of connecting the exhaust end of the QEV to the barrel, or just about anywhere other than the pilot end.

So? Again, high pressure hose assemblies aren't that darned expensive. Just buy the right part for the job!

Do they have NPT threads on the end?

And they can be purchased with any fitting you want.
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Unread postAuthor: Binary Blue » Sat Dec 22, 2012 10:04 pm

D_Hall wrote:
Binary Blue wrote:I wasn't planning to use the hose in the pilot area. I was planning on using it as a way of connecting the exhaust end of the QEV to the barrel, or just about anywhere other than the pilot end.

So? Again, high pressure hose assemblies aren't that darned expensive. Just buy the right part for the job!

Do they have NPT threads on the end?

And they can be purchased with any fitting you want.


I'll keep that in mind.


Just a quick update to the thread:

I went to Home Depot today and looked for short hose lengths. They only sell long lengths (10-25 ft usually).
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Unread postAuthor: PaperNinja » Sat Dec 22, 2012 10:20 pm

cut the hose...
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Unread postAuthor: Binary Blue » Sat Dec 22, 2012 10:48 pm

PaperNinja wrote:cut the hose...


But how do you attach the fitting to the cut end?

Sorry for all these noob questions.
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Unread postAuthor: jrrdw » Sun Dec 23, 2012 7:11 am

The ends have hose barbs on them. Cut the crimp off and what ever hose is in the crimp then use a screw clamp to hold it in the new length of hose you made. It's about one of the easiest things there is to do...
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Unread postAuthor: Technician1002 » Sun Dec 23, 2012 1:04 pm

Refrigeration service gauge hoses are rated for typical pressure you would find servicing an air conditioner.

They even come with proper crimped connectors so you don't have to use DYI hose clamps that are not built to hold the high pressure.
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Typical high side gauge is 0-800 PSI and the low side gauge is 0-300 PSI.
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Unread postAuthor: c11man » Sun Dec 23, 2012 2:41 pm

what type of threads/connectors do those HVAC hoses have on them?
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Unread postAuthor: Technician1002 » Sun Dec 23, 2012 7:32 pm

AC hoses fit a flair fitting. Not sure of the size. The service fitting they fit have a standard tire valve core in it, but the stem is larger diameter so a standard air chuck won't fit it.
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