Range/Pressure variances

[rkcarguy]

So I have been shopping tanks like many of us newbies and come across some older tanks from vehicles running the 2400 and 3000 PSI systems. In comparison to 3600 PSI, what is the difference one can expect in range(miles)between the different pressures for an equal sized tank?

[cngmike]

Re: Range/Pressure variances

The difference in 3000 to 3600 PSI is 15%.

[TheBundo]

Re: Range/Pressure variances

The difference in 3000 to 3600 PSI is 15%.

3600 is 20% more than 3000 (10% of 3000 is 300, 20% is 600)

[cngmike]

Re: Range/Pressure variances

It is not linear this was the figurers used to justify moving from 3000 to 3600 psi fills back in the mid 90's

[CraziFuzzy]

Re: Range/Pressure variances

Actualy mike, the pressure in a fixed volume of gas at a steady temperature is directly proportional to the mass (i.e. range). The reason you don't usually see that full 20% extra range going to 3600 from 3000, is a fill from near empty to 3600# will add a lot more heat to the cylinder, than going to just 3000#, therefore adding more 'artificial pressure'. On a slow fill system, which allows temperatures to stabalize, you will see that full 20% extra range on a 3600# fill over a 3000# fill.

[John Mitton]

Re: Range/Pressure variances

The most important difference between the tanks the opening poster is looking at and 3600 psi tanks is expiration date. The 2400 tank has likely expired by now. Don't install it!