HP hoses

[Tim Clark Diving]

Another source for O2 clean hoses:

Replacement Oxygen Hoses – AERO Specialties

www.aerospecialties.com

 

[Agro]

Came here to mention the McMaster hose - assuming that 3000psi rating is good enough, the braided steel over teflon/PTFE are surprisingly reasonable (especially for McMaster Carr!). I just picked up the 8' version of McMaster-Carr for booster use (since I'm not boosting O2 over 3k...). Oddly the 8' was slightly cheaper than the 7' or 9' - guessing they make/sell/stock more of those or something. McMaster can be somewhat unpredicable on shipping costs, but I think for the hose and a couple of parker quick-connects (see that thread - if you're rebuilding your whip this is the perfect time to go ahead and make it modular! )

Link does not work on my PC.
Mc Master seems not to have any hydraulic hose but air hoses, that should work.

 

[Agro]

Just spoke to my mechanic in the gas supplier company. They often clean hoses for oxygen use. They are not allowed to use:
- Diluent
- Acetone
- Brake cleaner
- and some other chemicals, which I do not know
Reasons:
- They do not clean enough
- They leave residues

They must use a special kind of liquid soap. He does not know its name as it is rebranded by his company.

 

[rjack321]

As linked - everyone I know used McMaster part 4468K132. Works fine up to 3500psi despite the 3k rating. They won't ship overseas, USA only. They are easy to clean with simple green, hot water, and air

 

[Agro]

As linked - everyone I know used McMaster part 4468K132. Works fine up to 3500psi despite the 3k rating. They won't ship overseas, USA only. They are easy to clean with simple green, hot water, and air

Sounds good. But fittings are rather large and 3000 psi does not work for me, I fill 330bar/4'800psi.
Prices are very good! If you only need 3'000 psi they are a cheap solution - and they seem to work.

 

[rjack321]

Sounds good. But fittings are rather large and 3000 psi does not work for me, I fill 330bar/4'800psi.
Prices are very good! If you only need 3'000 psi they are a cheap solution - and they seem to work.

Finding a teflon lined hose for 300bar use is basically impossible here - or more expensive than the booster in the first place. I don't know of a single shop or person here filling O2 over 200bar ish pressures anyway.

 

[iain/hsm]

I don't know of a single shop or person here filling O2 over 200bar ish pressures anyway.

Poor You.

Judging by what I have read so far on oxygen handling and the carefree opinions on cleaning for oxygen service with some of our fellow divers on here. My guess is all they need is the compressors factory settings access code and dial in what they like. (Illustration below of an Oxygen compressor Control panel in factory mode testing for a 12 CFM 207 bar Breathing Oxygen compressor running a conservative 420 RPM on a 7.5Kw 10HP 3 phase 400v N+E power supply )

 

[tmassey]

I echo what @Tracy said: Parker 527BA is their Breathing Air (hence BA…) hose. If you want the exact right tool for the job, that’s it.

Parker 520N is Parker‘s version of SAE 100/R8. I have seen both the Parker version and other brands used fairly extensively in scuba and SCBA applications.

I haven’t personally seen a large difference in price between 527BA and 520N. The biggest obstacle I have run into is availability: the shop near me always has 520N in stock, but 527BA always sends them scrambling.

Also, you have to look at the entire process to know if it is suitable for breathing gas. It’s not enough to simply select breathing gas compatible materials. The hose might’ve started life perfectly clean, but how has it been handled in distribution? Also, did the person swaging the ends on use oil to lubricate? Even if they didn’t actually squirt oil on your fitting, did they use the same nasty, gnarly swage tooling that they’ve used for God knows what other applications?

The odds of you getting a hose straight from a manufacturer that is suitable for immediate use in a breathing application is pretty small, unless it was sold by capable people specifically for that application.

That doesn’t mean that you can’t make it work. Like I said, I’ve seen an awful lot of Parker 520N or random SAE 100/R8 hose move an awful lot of gas in a number of fire stations. Just make sure you’re looking at more than just simple hose material to understand exactly what you are getting.

And, yeah, I understand the concept that something like trichloroethylene will completely vaporize, leaving no residue (of its own) behind. And such chemicals are used as dry cleaning chemicals for clothing. But, yeah, I have a hard time using industrial solvents in my breathing gas systems…. I usually use the same process that I use for O2-cleaning regulators, which is basically centered around various washes with acetic acid and Extreme Simple Green. (Simple Green changed their formula in 2012, and no longer states that Crystal Simple Green is O2 compatible.)

 

[iain/hsm]

Fresly made (off the shelf) hydraulic hoses are clean. We use it to transfill oxygen/nitrox/air.
If you are suspicious about it - hose can be easily cleaned using brake cleaner spray.

Nah. I can't agree on this for a number of reasons the first being you can never make an assumption that fresh made off the shelf hydraulic hose is clean when experience would tell you it most defiantly is not. Offshore hydraulic hose is never used in diving however the diving bell handling and umbilical control is and before commissioning all new off the shelf clean parts for all hydraulic systems are flushed and filtered for particulate and contamination. Experience would tell you the reasons why.

Second this idea of using brake fluid. First assuming its a mixture the question is of what?
Acetone to Naphtha are used in modern brake cleaners all the way up to Toluene

My guess is you're not planning of having kids any time soon.

Now on industrial (non breathing) oxygen compressors Acetone is indeed used for cleaning the pipes in big oxygen compressors 400 HP with 12 inch diameter intake pipes and a 3 inch diameter discharge lines for the like of steel works and Bessemer Plants but the critical parts is never on rubber compounds and hose its alway on the metal pipe and tubing.

Some of these fluids especially the narcotic effect under pressure or even a confined space is well known but some fluids attack some plastic and rubber polymers and weaken the internal structure of the hose .

Further a hydraulic shop will use a "chop saw" to cut your so called virgin clean hose so now you have bits of rubber and small particles of the steel wire all waiting to fly down your hose at sonic speed inducing impact and together with heat increase from the adiabatic shock load. Just saying it's a bad idea.

 

[iain/hsm]

I echo what @Tracy said: Parker 527BA is their Breathing Air (hence BA…) hose. If you want the exact right tool for the job, that’s it.

Parker 520N is Parker‘s version of SAE 100/R8. I have seen both the Parker version and other brands used fairly extensively in scuba and SCBA applications.

I haven’t personally seen a large difference in price between 527BA and 520N. The biggest obstacle I have run into is availability: the shop near me always has 520N in stock, but 527BA always sends them scrambling.

Also, you have to look at the entire process to know if it is suitable for breathing gas. It’s not enough to simply select breathing gas compatible materials. The hose might’ve started life perfectly clean, but how has it been handled in distribution? Also, did the person swaging the ends on use oil to lubricate? Even if they didn’t actually squirt oil on your fitting, did they use the same nasty, gnarly swage tooling that they’ve used for God knows what other applications?

The odds of you getting a hose straight from a manufacturer that is suitable for immediate use in a breathing application is pretty small, unless it was sold by capable people specifically for that application.

That doesn’t mean that you can’t make it work. Like I said, I’ve seen an awful lot of Parker 520N or random SAE 100/R8 hose move an awful lot of gas in a number of fire stations. Just make sure you’re looking at more than just simple hose material to understand exactly what you are getting.

And, yeah, I understand the concept that something like trichloroethylene will completely vaporize, leaving no residue (of its own) behind. And such chemicals are used as dry cleaning chemicals for clothing. But, yeah, I have a hard time using industrial solvents in my breathing gas systems…. I usually use the same process that I use for O2-cleaning regulators, which is basically centered around various washes with acetic acid and Extreme Simple Green. (Simple Green changed their formula in 2012, and no longer states that Crystal Simple Green is O2 compatible.)

I will grant you all you lot know more about "cooking chemicals" than us lot and will reference Breaking Bad as my mentor here

Of the solvents trichloroethylene together with Methylene Chloride Dichloromethane and the infamous
trichlorotrifluoethane and we are into an area I'm not sure we should discuss in an open forum.

On one hand we get lifted for breaking the Montreal Protocol Agreement on the other were into using precursor chemical for the production of Phosgene gas production neither of which I guess is on topic.

One thing to consider is no one here is talking about transfilling breathing air here
SAE 100R7 and R8 are fine for scuba and fire departments and breathing air but tranfilling oxygen being a magnetic gas requires the hose internal core to be NON CONDUCTIVE
This is the first essential factor in the choice of hose.

By way of a side line I can't recommend simple green either for standard anodised parts ( I think its call type 1 anodising in US) as it will wash out the anodising colour. Type III anodising or hard anodising is OK

Another point on hose cleaned for oxygen service is that are normally "Pigged" where a small hard plastic pig is fired down the tube like an ear bud to collect any particulate left and if shown the hose is re cleaned and a partial count (by comparison) is done on the flushed fluid (of choice) LOL and the end caps sealed with a plastic overwrap.