Question Is there a high pressure version of LP50's?

[rjack321]

I doubt you will locate a "rogue" requalifier. It is a USDOT regulated industry, with records retention, and they stamp a tank with a unique identifier. If there happened to be an issue, they could jeopardize their certification to conduct business.

They can be requalified in an "export" capacity but I forget the exact details in the CFRs on how that works. Good luck finding someone willing to do it though.

 

[rhwestfall]

They can be requalified in an "export" capacity but I forget the exact details in the CFRs on how that works. Good luck finding someone willing to do it though.

A licensed professional engineer providing stamped calculations for the cylinder to be tested that analyzes the cylinder and documents the boundaries of the test outcome.

I'd charge a lot more than the value of that tank to put my license on it...

 

[jstotz]

If anyone is curious, I recently discovered the answer to my original question: "Is there a high pressure version of a (cylinder that is the size/form factor of an) LP50?"

The answer is actually there kind of was at one time: "mid-pressure slim 72's".

I believe they were only made for a ~10 year stretch by Faber and branded for Scubapro. They had a working pressure of 3,000psi +10% = 3,300psi. They're slightly wider than an LP50.

I believe they were usually factory white enamel. The set I picked up in California(pictured below) happened to be stripped and galvanized. You can find other threads talking about slim 72's. Real shame they're no longer manufactured.

Pictured from left to right: green alu 80, doubles of MP slim 72's, LP 50'S with modular valves, alu40, HP100

 

[rjack321]

If anyone is curious, I recently discovered the answer to my original question: "Is there a high pressure version of a (cylinder that is the size/form factor of an) LP50?"

The answer is actually there kind of was at one time: "mid-pressure slim 72's".

I believe they were only made for a ~10 year stretch by Faber and branded for Scubapro. They had a working pressure of 3,000psi +10% = 3,300psi. They're slightly wider than an LP50.

I believe they were usually factory white enamel. The set I picked up in California(pictured below) happened to be stripped and galvanized. You can find other threads talking about slim 72's. Real shame they're no longer manufactured.

Pictured from left to right: green alu 80, doubles of MP slim 72's, LP 50'S with modular valves, alu40, HP100

Sadly these never had allowable expansion stamped on them so it's nearly impossible (but not completely impossible) to get a + stamp renewed

 

[rhwestfall]

I have one of those. It is a heavy tank.

 

[Jim Lapenta]

I never filled al cylinders to more than 3200 PSI "warm" and they would cool to 3000.
My LP cylinders? 2250 72's to 2800. 2640 95s, 85s, 75.5s, and 50s to 3300. 3500 for Great Lakes wreck dives with the larger cylinders.

 

[tridacna]

I doubt you will locate a "rogue" requalifier. It is a USDOT regulated industry, with records retention, and they stamp a tank with a unique identifier. If there happened to be an issue, they could jeopardize their certification to conduct business.

Not to mention their insurance exposure…PI attorneys have wet dreams thinking about this special kind of stupidity.

 

[rhwestfall]

I never filled al cylinders to more than 3200 PSI "warm" and they would cool to 3000.

that horrid mess of a tank - AL100 is a 3300 psi service pressure...

 

[rx7diver]

I have one of those. It is a heavy tank.

Gifted my then-GF one of the small versions (60 cu ft) of the Scubapro Slim cylinder c. 1990. Like my PST HP80 (3,500 psig), I found the 60 to be too negatively buoyant to safely dive in freshwater when I was wearing a thin wetsuit (or no wetsuit) at that time.

My 1987 Scubapro catalog lists the calculated buoyancy of the 71.4 to be -2.3 lbs in seawater, empty, without valve, and the 60.6 to be -2.5 lbs in seawater, empty, without valve. So, heavier, still, with valve and regulator attached!

rx7diver

 

[Nick_Radov]

If anyone is curious, I recently discovered the answer to my original question: "Is there a high pressure version of a (cylinder that is the size/form factor of an) LP50?"

The answer is actually there kind of was at one time: "mid-pressure slim 72's".

I believe they were only made for a ~10 year stretch by Faber and branded for Scubapro. They had a working pressure of 3,000psi +10% = 3,300psi. They're slightly wider than an LP50.

I believe they were usually factory white enamel. The set I picked up in California(pictured below) happened to be stripped and galvanized. You can find other threads talking about slim 72's. Real shame they're no longer manufactured.

Yes, that's correct. I had one of those 3300psi Scubapro / Faber 72's and it was painted white. It was more negatively buoyant than most other steel tanks which made the weighting adjustments kind of a hassle. I ended up just using it for shop air.