Failed + Rating

[mossym]

HI All
I'm looking at buying an LP95 from someone, he told me that it failed the + rating on it's last hydro, so it can't be filled to the full 95. DOes this mean if i get the tank it'll on be an 86 becuase it can only be filled to 2400? Or is there a way to get the + rating back?

 

[scubafanatic]

...unfortunately, you're right, mossym, as a LP 95 is 95 cu. ft. of gas @ 2640 psi and there's no way to 'recover' the "+" rating if the tank failed that part of the hydro...that is probably why the tank is 'on sale'.

Karl

 

[DA Aquamaster]

I'd be more concerned about the reason why it failed the + rating. It could mean a long history of overfills well over 10% in which case I'd pass on the tank entirely.

 

[mossym]

alright thanks guys..

 

[oxyhacker]

There's no marking or condemnation procedure specified in the FARs for branding a tank that passes the regular test but fails the + - it just doesn't get the +. So there's no reason you couldn't try for the plus again next hydro. My feeling is that a lot of tanks fail the + test because the shop doesn't know what it is doing, not because of any defect in the tank.

I would look into the tanks history, though, as others have suggested. If it seems OK (previous owner did not live in FL or own a compressor!). it's probably worth taking a chance on if you can get it at a good price.

However, just having the plus doesn't guarantee getting more air - a lot of shops seem to put the same amount of air in them regardless.

 

[scubadoguk]

There's no marking or condemnation procedure specified in the FARs for branding a tank that passes the regular test but fails the + - it just doesn't get the +. So there's no reason you couldn't try for the plus again next hydro. My feeling is that a lot of tanks fail the + test because the shop doesn't know what it is doing, not because of any defect in the tank.

I would look into the tanks history, though, as others have suggested. If it seems OK (previous owner did not live in FL or own a compressor!). it's probably worth taking a chance on if you can get it at a good price.

However, just having the plus doesn't guarantee getting more air - a lot of shops seem to put the same amount of air in them regardless.

I have to ask "why florida" I know one store down there that does strange things to clynders or is it the cave dive overfill thing ?

 

[jonnythan]

Overfilling tanks for cave dives is common practice in FL.

 

[HarleyDiver]

I have to ask "why florida" I know one store down there that does strange things to clynders or is it the cave dive overfill thing ?

We do tend to overfill them just a little down here.

 

[scubadoguk]

We do tend to overfill them just a little down here.

yep but then as oxy said the not knowing what there doing may be a issue too, I mean that in a very nice way just in case

 

[Bob3]

Yah, it may indeed pass another + test, as reported many hydro joints don't bother unless requested, or they don't have the proper "numbers" to plug into the calculations needed.
To oversimplify the + rating, think of the tank contracting back to it's original volume after stretching during the hydro. (more or less). sorta.