Max safe pressure for HP steel tanks?

[cloudboy55]

What is the maximum safe fill pressure for a 3400 psi tank? I have recently had them filled (not by choice) to over 3700 psi. Is this safe?

cloudboy55

 

[dbg40]

You'll blow the disc's before you ever harm that tank. You should see what they do to them when their hydro'd!

 

[aabond]

I have a pair of hp100's that are always filled between 4000-4200 psi, at a shop where all they do is fill tanks.

 

[CD_in_Chitown]

The burst disk in HP tanks is usually set to blow around 4500-4800 IIRC,

The other side; cylinders are designed to withstand cycles to max working pressure, applying pressures above max working pressure = less cycles in the life of the cylinder...at least that's the theory as I understand it.

 

[Jim Baldwin]

What is the maximum safe fill pressure for a 3400 psi tank? I have recently had them filled (not by choice) to over 3700 psi. Is this safe?

cloudboy55

When I have my PST HP tanks filled I ask that they be filled to 4200 psi. I have found that no matter how slow the fill when they cool down I will have between 3500 -3700.

If they just fill to 3500 it will be a short fill at around 3000. POn a 100 c.f. tank the extra 500 psi will get you from 85 cu. ft. to 100 cu. ft.

 

[diverDano]

Kepp in mind, not all burst disks are installed properly. My lp tanks have 5000 psi disks, so best to actually check the rating.

 

[VinceDS]

I dive double HP 120s and, with the shop I use, routinely get 4000psi+ fills (cold). I will say that I dive them within a day or so and keep them in a cool garage

 

[VinceDS]

I have a pair of hp100's that are always filled between 4000-4200 psi, at a shop where all they do is fill tanks.

Bet I know where you are getting your tanks filled.