How often do you actually get a full tank fill?

[Tracy]

Because lp72s are a 2200 psi tank and plus rated at 2420.... Being 50 years old with some of the thinnest walls ever is another reason to not go crazy overfilling them. They are hydroed at 3600

While they are all close, not a single measurement you gave is correct.
Cylinder pressure is 2250
Working pressure is 2475
Hydro pressure is 3750

**** edited to add*** Yes, I know I sound like an ass. It really isn't my intention. For some reason those little inaccuracies really bother me.

Filling them to 3000 will not hurt the tank. They don't like 3600 fills and will eventually fail hydro if they are filled that way for years.

 

[bakodiver391]

I run a fill station and rent Al80s, and charge $6 per rental. For $6 my customers get a tank that was filled to 3150 and allowed to cool to somewhere around 3000. No, I'm not going to top it off again, no I'm not going to mess with my auto-shutoff switch just for one customer with HP tanks. It's called being the only game in town, and my customers appreciate getting very clean air in well serviced tanks for a reasonable price.

 

[Eric Sedletzky]

Because lp72s are a 2200 psi tank and plus rated at 2420.... Being 50 years old with some of the thinnest walls ever is another reason to not go crazy overfilling them. They are hydroed at 3600

2250 stamped on the tank and 2475 with 10% overfill.
3000 all day long, gives you an 86 then.

 

[rjack321]

While they are all close, not a single measurement you gave is correct.
Cylinder pressure is 2250
Working pressure is 2475
Hydro pressure is 3750

**** edited to add*** Yes, I know I sound like an ass. It really isn't my intention. For some reason those little inaccuracies really bother me.

Filling them to 3000 will not hurt the tank. They don't like 3600 fills and will eventually fail hydro if they are filled that way for years.

I was sleepy and going from memory. I only have one of them now, although I have bought a couple here and there used. Several have failed VIPs (before I could even fill them) as the allowable pit depth is pretty minimal given how thin the walls are. I wont try to recall that pit depth as I looked it up years and years ago. My current one is filled with emergency O2.

 

[rob.mwpropane]

Because lp72s are a 2200 psi tank and plus rated at 2420.... Being 50 years old with some of the thinnest walls ever is another reason to not go crazy overfilling them. They are hydroed at 3600

That's good to know. I don't have any 72's in my rotation so I never really looked into them.

Thanks for the clarification.

 

[happy-diver]

Is the rule of thumb to buy a 100 when you need 90 cubic feet, and a 120 when you need 100?

No as the 100 is a mostly manageable fun tank where the 120 may cripple your stealth and limit freedom

 

[Still Kicking]

Here's an idea .... go to your LDS with a box of donuts (morning) or a pizza (lunchtime)...introduce yourself; ask them what is the best way to get a solid fill every time? I bet your tank filling experience will improve.

 

[DogDiver]

I get 100% good fills every time at Amigos in Ft White Florida. Self serve 24/7 I fill my cylinders myself. Funny, I always thought the 2400 stamped on my cylinders was to remind me of my turn pressure.

 

[Capt. Bas]

Maybe I'm lucky to dive in the Netherlands.
The local dive store, lake operator fills the present standard 230B cylinders to 230B. Cooled down 215/220b remaining.
Alu 80's will be filled till just above 200b Same as older type steels rated for 200b.
If you have a 300b cylinder they will be hot filled till 330b about cooled down it will be very close to 300b actual bars.

 

[USdiver1]

I get 100% good fills every time at Amigos in Ft White Florida. Self serve 24/7 I fill my cylinders myself. Funny, I always thought the 2400 stamped on my cylinders was to remind me of my turn pressure.

Wayne was the kind of LDS owner who treated his customers like family. Glad to hear Bruce is continuing this tradition.