On Jun 18, 5:34*pm, canuck_bob wrote:

I am planning to step down the acet to 15 lbs as the accepted maximum
for delivering acet gas from a cylinder. *I'm worried 15 lbs might be
too low to properly utilize the second regulator and hold accurate
pressure and flow for OA welding.

I did the same thing with O2 regulators years ago for a home built O2
re breather. I needed the second stage because when the tank got low
the regulated pressure went way up and wasted gas. Setting the first
stage at 15 psi and the second at 3-5 worked great and about doubled
the time before the pressure spiked.

IMHO it should work just as well for keeping your acetylene pressures
stable.
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Leon - DragerSorb - McAtee