HP steel , LP steel and nitrox

[BadLatitude]

I was on the hunt for some HP 80's found some made by Faber. I currently have worthington LP 85sWhen i came across a shop who actually had them in stock. Scrolling down the page it had the normal comparison paragraphs ect but in bright font it said Not recommended for Nitrox. I found this odd and though maybe there is a specific physical reason like its lined with somthing that doesnt like that much O2 ect. So i called and asked. I was told you shouldnt put nitrox in HO tanks because of danger of explosion ?!?!? because the gas is heated more packing it under preasure.

Now this bolth does and does not make sense to me cant the tanks be filled to my normal 2800-3000 psi then bet let cool and pump in another 700-500 lbs and be safe?

Am I just completely missing somthing? If so excuse my ignorance.

Should i just wait for the worthington HPs being released from inspection at the end of the month?

 

[BadLatitude]

no one has an opinion on filling an Hp steel with nitrox?

 

[ibeattieedwards]

In Europe almost all our tanks are steel....


We use Nitrox without any problem.....


Ian

 

[spectrum]

Scrolling down the page it had the normal comparison paragraphs ect but in bright font it said Not recommended for Nitrox.

What page? Web page, manufacturers catalog or a dive shop stock sheet?

Pete

 

[Halthron]

In Europe almost all our tanks are steel....

Almost every tank I saw in Greece (not all that exist, of course), during the two years I lived there, was Aluminium.

 

[The Kraken]

Don't know about the Fabers, but I have 5 PST high pressure tanks and they're all O2 cleaned and I dive nitrox in them.

the K

 

[StSomewhere]

If your nitrox is made using the partial pressure method, the O2 goes in first when tank pressure is the lowest (slowly!), its then topped off with hyperclean air.

Pure O2 under high pressure is a concern, at a minimum it definitely requires careful handling by a knowledgeable blender.

But for EAN40 or less (remembering that the air you are topping off with is EAN21 for all intents and purposes) its not an issue as long as your tanks are O2 clean -- and stay that way.

 

[Web Monkey]

I was on the hunt for some HP 80's found some made by Faber. I currently have worthington LP 85sWhen i came across a shop who actually had them in stock. Scrolling down the page it had the normal comparison paragraphs ect but in bright font it said Not recommended for Nitrox.

No idea about the Nitrox, but I keep away from HP tanks just because it's harder to get a good fill, and there's a greater change in buoyancy between full and empty.

Terry

 

[The Chairman]

I get great fills with NitrOx all of the time in my HP 120s.

 

[StSomewhere]

No idea about the Nitrox, but I keep away from HP tanks just because it's harder to get a good fill

An E7-100 shortfilled to 3000 psi has more gas at 89 cf than the slightly larger LP85 filled to 2640. Unforunately the E7-100 is also 85% more expensive.

and there's a greater change in buoyancy between full and empty.

:06: Gas weighs what it weighs. The swing between an E7-100 is very similar to the swing you'd get from an AL100 or LP95. The more gas you use, the larger the swing. That's not a high pressure vs. low pressure tank issue.