Tank overfill

[Leadking]

Go to www.divefaber.com and register to gain access to the drawings. You can search on a variety of criteria.

I can always provide the source for any postings I have made. It is my goal to get rid of the myths and rumors about cylinders and valves and disseminate the facts.

Be aware that the temper (hardness) of European tanks is different than those in the U.S. and a tanks cannot meet both U.S. and European standards with the same temper.

 

[Padipro]

My LDS always fills my LP 108's to 3000. In fact they don't even ask any more as they are a tech shop so if it's LP it's going to get 3000 psi in it unless you tell them otherwise.

I think is rather funny that the vast majority of those posting against over filling LP tanks are from up north or out west and those for it are from Florida.

 

[Tom Winters]

Well Scott, that's cause them people livin' down heah is too dum and ignernt and bizzy diving not to go overpumping them goober scoober tanks. It ain't spelt "Floriduh" fer nuthin' bub!

 

[Rick Murchison]

Where do they claim that?

OMS used to state that in all their ads for LP 85's. They don't anymore.
If I can find one I'll scan it, but I've recently tried to throw out all the old mags I never look at anymore.
Rick

 

[padiscubapro]

Please point me to a web page showing a European tank with the same dimensions and weight as an LP95 or LP108 that's rated to a significantly higher pressure than 2640 psi.

Faber has been redoing alot of its line so making comparisons for current cylinders is a pian in the butt.. But here is a comparison for two tanks I know are almost identical (these are 3l rb cylinders)

for the uk..
[font=Arial, Helvetica, sans-serif]Work Pressure = 232 bar[/font][font=Arial, Helvetica, sans-serif]
Test Pressure = 348 bar[/font]

[font=Arial, Helvetica, sans-serif][size=-1]​

Water Capacity
(nominal, l)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]External Diameter (D)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Length (L)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Weight
(nominal, kg)[/size][/font]

[font=Arial, Helvetica, sans-serif]3[/font]
[font=Arial, Helvetica, sans-serif]99.5[/font]
[font=Arial, Helvetica, sans-serif]500[/font]
[font=Arial, Helvetica, sans-serif]3.4[/font]

[font=Arial, Helvetica, sans-serif]According to BS5045 P.1+ LATEST AMENDMENTS
Cylinders manufactured from : plate
Material : Chromium Molybdenum Steel[/font]

[font=Arial, Helvetica, sans-serif]Work Pressure = 184 bar[/font][font=Arial, Helvetica, sans-serif]
Test Pressure = 276 bar[/font]
[font=Arial, Helvetica, sans-serif][size=-1]
Water Capacity
(nominal, l)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]External Diameter (D)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Length (L)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Weight
(nominal, kg)[/size][/font]

[font=Arial, Helvetica, sans-serif]3[/font]
[font=Arial, Helvetica, sans-serif]100[/font]
[font=Arial, Helvetica, sans-serif]495[/font]
[font=Arial, Helvetica, sans-serif]3.7[/font]

[font=Arial, Helvetica, sans-serif]According to DOT 3AA / TC3AAM
Cylinders manufactured from : plate
Material : Chromium Molybdenum Steel[/font][font=Arial, Helvetica, sans-serif]Notes:
- DOT 3AA: W.P.2640 PSI (INCLUDING 10% OVERFILLING)
- For DOT3AA(USA) cylinders a 10% overfill is allowed if a plus (+) symbol is marked on the dome of the cylinder
- TC3AAM,W.P. 184 BAR


the pages didn't cut and past well, but if you look the first is rated at 232 bar, the us is 184 bar(3364 psi) (including overfil) and you can see the UK cylinder is .3kg lighter (about .7 lbs) but its rated 48bar (696 psi) higher
The main difference is the wall being thinner on the uk cylinder and about 3/16 inch longer

I found some 13l cylinders ~ 85cuft @ rated pressure in US.. same thing thinner walls, us tank less pressure but is 1.1kg (2.42 lbs) heaver

US
[font=Arial, Helvetica, sans-serif]Work Pressure = 184 bar[/font][font=Arial, Helvetica, sans-serif]
Test Pressure = 276 bar[/font]
[font=Arial, Helvetica, sans-serif][size=-1]
Water Capacity
(nominal, l)[/font]
[font=Arial, Helvetica, sans-serif][size=-1]External Diameter (D)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Length (L)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Weight
(nominal, kg)[/size][/font]
[font=Arial, Helvetica, sans-serif]13[/font]
[font=Arial, Helvetica, sans-serif]203.6[/font]
[font=Arial, Helvetica, sans-serif]540[/font]
[font=Arial, Helvetica, sans-serif]15[/font]

[font=Arial, Helvetica, sans-serif]According to DOT 3AA / TC3AAM
Cylinders manufactured from : plate
Material : Chromium Molybdenum Steel[/font][font=Arial, Helvetica, sans-serif]Notes:
- DOT 3AA: W.P.2640 PSI (INCLUDING 10% OVERFILLING)
- For DOT3AA(USA) cylinders a 10% overfill is allowed if a plus (+) symbol is marked on the dome of the cylinder
- TC3AAM,W.P. 184 BAR
[/font]

[font=Arial, Helvetica, sans-serif]and a european[/font]
[font=Arial, Helvetica, sans-serif][font=Arial, Helvetica, sans-serif]Work Pressure = 232 bar[/font][font=Arial, Helvetica, sans-serif]
Test Pressure = 372 bar[/font]
[font=Arial, Helvetica, sans-serif][size=-1]
Water Capacity
(nominal, l)[/font]
[font=Arial, Helvetica, sans-serif][size=-1]External Diameter (D)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Length (L)
(nominal, mm)[/size][/font]
[font=Arial, Helvetica, sans-serif][size=-1]Weight
(nominal, kg)[/size][/font]
[font=Arial, Helvetica, sans-serif]13[/font]
[font=Arial, Helvetica, sans-serif]203[/font]
[font=Arial, Helvetica, sans-serif]545[/font]
[font=Arial, Helvetica, sans-serif]16.1[/font]

[font=Arial, Helvetica, sans-serif]According to EN 1964-1:1999
Cylinders manufactured from : plate
Material : Chromium Molybdenum Steel[/font]
[/size][/font]

[/size][/font]

 

[Leadking]

That is why the warning "Be aware that the temper (hardness) of European tanks is different than those in the U.S. and a tanks cannot meet both U.S. and European standards with the same temper."

I will be able to get the yield in psi and post it later.

 

[jonnythan]

3 pounds heavier and 2 inches longer does not equal "same tank"

 

[markfm]

Need to check with a Tute engineer That's more like 2.5 lbs and only 0.2" longer -- in other words a fair chunk more metal in the European tank.

Not sure at all about the first example, the really small tank. The second example is using about 8% more steel, for about the same tank surface area (pi-r-squared-h)

 

[jonnythan]

Whoops, 5mm not 5cm

Any good engineer will tell you that 2.5 rounds nicely to 3

 

[pickens_46929]

I also own a Faber LP 85.......it's actually rated to be full @ 2640 psi, so you are getting 85 cu. ft. of gas @ 2640 psi ( 2400 psi + another 10%= 2640 psi) so your 3000 psi fill was only a -- 13 % -- overfill.....rather trivial and absolutely nothing to worry about....you should thank your lucky stars you've got a dive shop that does decent fills.....I know plenty of shops that would give you a 2640 psi 'hot fill' and you'd be down to 2300-2400 psi after cool down = a 'short ' fill.

Karl

Thought the Faber 85's were 85 cu. ft. @ 2400 psi and ~93 cu. ft. at +10% or 2640 psi?

Dave