question about psi tolerance in regulator.

[Icarusflies]

I just bought 2 Faber hp cylinders 100's. They are rated at 3442 psi. I use a mares proton 12 regulator with a yoque valve. The place where I bought the tanks assured me that my regulator could handle the pressure but I see in the manual that the max psi for my regulator with yoke is 3364 psi. What do you think, is the differnce minimal?

 

[Gary D.]

Fill them to 3350 or get ahold of Mares directly and ask them.

Asking us if it's ok isn't the best thing to do. We will give you everything from OK, sure go ahead, it's safe, it's dangerous, it will kill you or someone else, maybe and so on. Go to the horse itself and make sure or just short fill your tanks.

Gary D.

 

[spectrum]

3364PSI , that's a number we don't hear very often!

Let's just say it's minimal compared to your SPG, your tanks checker (if you have one) and the fill stations analog gauges resolutions and accuracies.

If you are concerned just ask shops not to give you an overly generous fill. A slow gentle run up to 3450-3600 should cool down just about right.

The engineer will say that there is a far more significant design marin already built in.
The lawyer will say specs are specs.

Have fun diving the new toys!
Pete

 

[Blackwood]

Everything built has a safety factor designed in. It's probably at least 1.5, maybe more.

Physically, it should have no problem holding ~2% more than the rated pressure, but if you are worried don't risk it.

 

[miesemer]

Since your new cylinders were probably supplied with convertable "ProValves",
my recommendation is to swap the yoke connection on your regulator for a DIN connection (about $50).

 

[Charlie99]

3364PSI , that's a number we don't hear very often!

Actually, that number shows up really often, but usually expressed as 232 bar :banana:

Kind of like that precise sounding 98.6F normal body temp. It's really just a rough approximation, rounded off to the nearest degee C ----- 37C. It's only when we convert back to F does it sound so precise.

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I do agree with your observation that the couple of percent difference between 3442 and 3364 is negligible compared to the safety factors. The difference also corresponds to the sort of pressure difference you will see with a 15F rise in temperature. The difference between 3442 and 3364 is also smaller than the variation in the pressure in real life fills.

In other words ... Don't sweat it.

Charlie Allen

 

[oxyhacker]

Reg manufacturers seem to rate yokes very erratically and sloppily, so it doesn't make much sense to lose sleep (or put up with short fills!) over a mismatch of 100 psi or so.

In the case of your regs, interestingly, the yoke is also described as being 232 bar, which is probably exactly the same as your tanks (if they are really 3442s) So it may only be that whoever at Mares did the math forgot to compensate for temperature when they did the conversion from metric.

I just bought 2 Faber hp cylinders 100's. They are rated at 3442 psi. I use a mares proton 12 regulator with a yoque valve. The place where I bought the tanks assured me that my regulator could handle the pressure but I see in the manual that the max psi for my regulator with yoke is 3364 psi. What do you think, is the differnce minimal?

 

[Gary D.]

Many moons ago everything in sport was only 2150 psi. I'm still using an old 2150 yoke for a psi check gage for stuff up to 3500 psi. With 40 years of use and abuse it hasn't failed so I would say the safety margin engineered in is quite high, even for back then.

That yoke gets the gage put on and off quite often. I pull the gage, add a 3' hose and use it for filling barrels. When I'm done I put the gage back on and check tanks. So it hasn't been pampered over the years.

Legal issues are more of a problem than safety issues. So it may be OK but I for one will not tell you to exceed its recomended psi. But would I do it? Sure and without batting an eyelash.

Gary D.

 

[Icarusflies]

Thank you all;

Yes, I got the 3364 psi number from the conversion of the 232 bars that is stated in the manual.