REE value for Norris LP72?

[SaltyWombat]

Is a REE value available for vintage Norris 2250 LP72s? I know an old document from PST exists with REE values of their cylinders. I've never heard of one for Norris cylinders, but I thought I'd ask.

The goal would be to bring a document to a hydro requalifier in hopes of getting a plus rating.

 

[Johnoly]

The goal would be to bring a document to a hydro requalifier in hopes of getting a plus rating.

Unless that 'document' is signed and stamped by a currently licensed professional engineer in your state along with his calculations (including ultra sound wall thickness), most hydro places won't do that on a non-REE stamped tank. Vintage tanks without the stamp can be expensive to own unless you have your own compressor. @Luis H has alot of Norris numbers & documents.

 

[ScubaBunga]

I think the last + stamps I got they used the same PST value for the norris. From an earlier set of posts and spreadsheets from luis I think his value for norris was 60.1. It's been a while now since I looked and don't seem to have it handy, but there is a process of measuring a set of related tanks to get a DOT acceptable value (I think its in that previous post list from luis)

As noted though, finding a hydro guy that will trust their cert on these values is tough to find. If you find one, let me know, I'll travel some distance to get my set + stamped next time they are due.

My local hydro guy won't plus stamp without REE documentation for the exact serial numbered tank. Which will never happen for older tanks.

Good luck!!

 

[SaltyWombat]

If you phone around, you can possibly find a requalifier who'll accept old documentation. Wasn't a problem for me.

 

[ScubaBunga]

If you phone around, you can possibly find a requalifier who'll accept old documentation. Wasn't a problem for me.

I’ve called every one in the state. So far no luck on a positive response. The one LDS said they would, I brought in a tank and apparently they just changed hydro place (old one stopped) and new one wouldn’t even consider it.

 

[Whitrzac]

Might be worth calling dive shops that would just fill to 2400 without the + mark anyway.

Or find someone with a compressor

Or just move to north FL where they'll fill them to 4k every time.

 

[ScubaBunga]

Might be worth calling dive shops that would just fill to 2400 without the + mark anyway.

Or find someone with a compressor

Or just move to north FL where they'll fill them to 4k every time.

yeah, there are some LDS that do provide good fills - just like the + to minimize arguing at the rest of them.

 

[tmassey]

I used to be worked up about the plus Hydro, so I very much understand the logic.

But honestly, to me, 72s don’t make sense unless you feel them to 3000. And if you’re willing to fill them to 3000, you’re already willing to ignore the “rules“ so what difference does the plus make?

Not gonna lie, my Zen opinion about the plus sign may or may not have some sort of correlation with when I purchased my own compressor…

For me, when properly filled, LP 72 doubles are my favorite tanks for things I would have done in a larger (>100 CF) single tank. To replace a smaller single tank, my LP50 Doubles are my preferred tank, again properly filled.

But if you’re forced to fill them to their service pressure… they lose nearly all of their advantage to HP100’s. And I’m not sure they ever make sense as single tanks — but I also haven’t dove a single tank in nearly a decade.

 

[SaltyWombat]

But honestly, to me, 72s don’t make sense unless you feel them to 3000. And if you’re willing to fill them to 3000, you’re already willing to ignore the “rules“ so what difference does the plus make?

These double LP72 are for a small diver with a low gas consumption rate. A fill to 2250 + 10% will be adequate.

They seem like a good choice for small divers in cold water.

 

[ScubaBunga]

I used to be worked up about the plus Hydro, so I very much understand the logic.

But honestly, to me, 72s don’t make sense unless you feel them to 3000. And if you’re willing to fill them to 3000, you’re already willing to ignore the “rules“ so what difference does the plus make?

Not gonna lie, my Zen opinion about the plus sign may or may not have some sort of correlation with when I purchased my own compressor…

For me, when properly filled, LP 72 doubles are my favorite tanks for things I would have done in a larger (>100 CF) single tank. To replace a smaller single tank, my LP50 Doubles are my preferred tank, again properly filled.

But if you’re forced to fill them to their service pressure… they lose nearly all of their advantage to HP100’s. And I’m not sure they ever make sense as single tanks — but I also haven’t dove a single tank in nearly a decade.

I've found dive shops will see no plus and fill to 2250 and not want to overfill. If they see the + they are more willing to fill to 2600-2800 with fewer issues. The one place I go (well depending on who's filling) will fill to 3k for me. So if I can find a place to + stamp, I'll do that. Perception is everything sometimes. If I lived somewhere where I dove all the time, I'd justify a compressor, but sadly I don't.