Quote: (Originally Posted by iain-hsm)
In a word yes we have tested this type of hose IMHO I don’t think this is a good choice for oxygen there is a much better option with the SAE 100 R7 and stainless crimped ends. Using nitrile is the poorest option, Swagelok were well advised to suggest changing the hose each year. In oxygen nitrile is a pretty poor material and will age quickly become brittle and crack.
Also consider that push on fitting are not allowed in divers breathing hoses offshore or with military as not an effective closure for critical use. Re-useable type fittings for commercial divers umbilical and bail out whips were banned some 20 years ago.
The other consideration for breathing hose is the fitting pull test (push ons failed this) and a tension test were a sample hose is loaded with a 50Kg weight over a 2 inch tube for 24 hours, the hose is then tested for elongation and deflection by length measurement and by shooting a steel ball through the hose. If it passes this the sample is then subjected to a hydraulic burst test within 12 hours. Agreed not all “divers” equipment is tested to this standard showing once again the difference between standards for Diving and Scuba. Iain Middlebrook
Hi Iain
Thanks for your opininons, I have been thinking about the things you are saying a lot, and also been talking with the folks who are making the hoses for the AGA interspiro system.
The problem I have, is to make custom hoses between two different "worlds". The scuba and the industrial high preassure gas hose worlds.
My plan was to use the BP-4 hose for prototyping, as I think it´s good enough for that.
But the main problem still stands, to produce the high (highest) quality hoses for permanent use. I still have´nt found anyone who can supply crimped SS fittings for both "worlds".
Maybe I'll have to make some of them them by my self ??
Another problem is everyones different opinions about material good enough for oxygen, I think there is as many opinions as pepole answering this.
Anyway im very thankful for more tips about this.
Best regards
Rikard Bengtsson
Sweden