Overfilling HP100 tanks

[climbr1]

I agree with all of your thoughts. I am NOT currently overfilling. I go up to 3700 and let it cool to normal pressure so maybe I am maybe not. I dont consider that overfilling. Im a fireman and fill at work so I can let my tank sit on the compressor for a turtle slow fill and get it exact without any heat so I only go higher when out at the dive site. I was more curious as to why people are doing it with LP and not HP and oxyhacker answered that for me.
I think once you factor in the cost of wear on the reg components, the minimal addition of gas and the added stress of "is this the day" then its not wise. This tank will eventually be part of a double set so the gas volume problem will fix itself one day. I dont want to have one "stressed" tank and one normal new one when that day comes so Ill stick to the normal psi.
Or skip breathe j/k

 

[climbr1]

Look at what a firefighter subjects their cylinders to. Repeated intense heat followed by rapid cooling, falls, crush from falling debris, repeated rapid filling and draining and all around abuse from guys who if given two ball bearings will loose one and break the other. There are cases of cylinder failure but its extremely rare. Now this may not be a apples to apples comparison but I will guarantee and maybe fire diver will help me out. Our cylinders now are carbon wrapped and maybe heavier duty but I have become extremely comfortable with the capabilities of the steel cylinders we use to use. Same design, nearly same pressure and 10X the abuse. Just a though

 

[fire_diver]

I was more curious as to why people are doing it with LP and not HP and oxyhacker answered that for me.
I think once you factor in the cost of wear on the reg components, the minimal addition of gas and the added stress of "is this the day" then its not wise. This tank will eventually be part of a double set so the gas volume problem will fix itself one day. I dont want to have one "stressed" tank and one normal new one when that day comes so Ill stick to the normal psi.
Or skip breathe j/k

When you are talking about over-filling LP tanks, its NOT a matter of "minimal addition of gas". Cave fills on LP tanks can result in close to double the gas. Most of these are double sets too. These folks are hitting caves with over 300cf of bottom gas of thier backs, plus travel and deco tanks.

...all around abuse from guys who if given two ball bearings will loose one and break the other. ...maybe fire diver will help me out. Our cylinders now are carbon wrapped and maybe heavier duty but I have become extremely comfortable with the capabilities of the steel cylinders we use to use. Same design, nearly same pressure and 10X the abuse. Just a though

You got that right, "fireman tough" is a very high standard! The cabon-fiber tanks are certainly lighter, but they aren't as tough. The standard is set at cuts and scratches that can only break a few fibers, or be a certain length before the tank has to be re-furbed and hydro'd to be put back in service. They are also only good for a max of 10 years and then have to be destroyed. But certainly abuse our gear WAY more than any divers ever dreamed of.

 

[05sportsman]

You got that right, "fireman tough" is a very high standard! The cabon-fiber tanks are certainly lighter, but they aren't as tough. The standard is set at cuts and scratches that can only break a few fibers, or be a certain length before the tank has to be re-furbed and hydro'd to be put back in service.They are also only good for a max of 10 years and then have to be destroyed. But certainly abuse our gear WAY more than any divers ever dreamed of.

Full Wrap SCBA tanks are 15yr lifespan. SCI makes a 30 year tank but the cost is almost twice as much. You must have been a firefighter a long time to have been exposed to a real steel tank. Around here the guys call the aluminum 2216psi bottles "Steels", don't know what they are tanking about

 

[fire_diver]

OT, but who cares at this point....

We still had some steels in inventory when I joined, but most of them were the aluminums. I am sure that the original wrapped tanks we bought have a shorter life than 15 years, but I don't have the info front of me. I know we already destroyed one batch but they were yellow coated tanks, not the clear tanks we have on the trucks right now. I'll do some checking.

I was just thinking the original tanks we had were most likely fiberglass wrapped, and not carbon fiber. These may have also been some of the original wrapped tanks, with a very short life span because they didn't know how long they would last. Still going to check out my info.

 

[climbr1]

There were both, steel and alloy. I have some of the old steel ones that I use to power a nail gun from a SCBA pack I rigged up from a fittings bin for USAR work

 

[Peter_C]

The better question is what are your regs rated for? My Scubapro regs are rated for 4,200 psi so I keep my tanks below that Okay not that high, but my base fill is always around 3,600-3,800 psi.