[virgil283]

your home system compresses it to liquid....no? ....don't know why I said liquid 'cause I know we are talking about compressed N.G....What kind of pressures are we talking about (in the vehicles storage tank)

[thackney]

The most common (only US??) home refill unit (Phill by BRC) goes to 3,600 psi in their write-up. I think I’ve read the vehicle CNG tank code was 4 or 5,000 psi with a very significant safety factor on top of that.

[thackney]

What are minimum burst pressure for each type of cylinder?
http://www.iso11439.com/faq.php

ISO 11439 defines different burst pressure for each type of cylinder based on the raw material used

CNG-1 Metal:2.25
CNG-2 Type of fiber: Glass:2.75 Aramid:2.35 Carbon:2.35
CNG-3 Type of fiber: Glass:3.65 Aramid:3.1 Carbon:2.35
CNG-4 Type of fiber: Glass:3.65 Aramid:3.1 Carbon:2.35

These factors define the minimum burst pressure in ratio to working pressure. E.g. A 200bar working pressure cylinder of type 3 is made with metallic liner and wrapped with Carbon fiber. This means the cylinder should not be filled over 200bar of content gas and will have to be able to withstand minimum pressure of 470bar (The cylinder may burst above this pressure).

200 bar = 2,900 psi
470 bar = 6,187 psi

[thackney]

The most common (only US??) home refill unit (Phill by BRC) goes to 3,600 psi in their write-up.

I need to quit doing these off my memory. After seeing the lower tank values I checked. It is 3,000 psi.

http://www.brcfuelmaker.it/en/phill-domestico-prodotto-brc-fuel-maker.aspx

[Clay Moore]

The tanks are hydro-tested at 3,5, or 10 years intervals depending on composition to 5/3 of their working pressure.