I believe it depends on the regulations for a specific tank manufacturer. There are some odd type things that go along with the test perameters as well. I don't recall specifics but it had something to do with expansion limits or something along those lines.
If you pull up a PDF of a tank's special perit, it will have the testing criteria in it - which will give you the pressure used for that tank manufacturer.
EDIT: Here is a special permit for a Luxfur cylinder: http://www.phmsa.dot.gov/staticfiles...2009100578.pdf
. Read up on page 3, part b. The cylinder is to be filled to 5/3 of the marked cylinder pressure. The specifics I couldn't recall have to do with the elastic expansion (part b, ss 2.).
Graphite Dangerous Power REV-I
– TechT bolt engine, REV-I & Disruptive barrel kits, Prophecy V2 w/ Empire feedgate, Crossfire SS 68/4500
Maroon and Polished Aluminum Dangerous Power Threshold
– 7th Element board, TechT bolt engine, magnet trigger kit, REV-I PMD, Sly Dual Carbon barrel kit, Prophecy V2, Crossfire SS 68/4500
Black and Silver Dangerous Power F8
– APE Rampage board, VS bolt, magnet trigger kit, F8 gauge, REDZ barrel kit, Halo B w/ Exalt feedgate, PMI 68/4500
Polished Aluminum and Red Dangerous Power F8
– Virtue board, VS bolt, magnet trigger kit, Halo B w/ Exalt feedgate, PMI 68/4500
Last edited by CA_Tectonics : 01-31-2013 at 12:06 AM.