Pat, when you open the valves, make sure both regulators are backed off (stem of the regulator loose) then crack the valve(s) SLOWLY, til you see the first pressure gauge show pressure (if it will) - if you hear any hissing at this point, you have problems. Close the tank valves and check things out further.
ABSOLUTELY DO NOT, WITH NEW OR OLD O/A GEAR, HAVE ANY BODY PARTS IN LINE WITH THE REGULATOR ADJUSTERS WHEN OPENING TANK VALVES - if the diaphragm in a regulator is stress cracked, the sudden surge of pressure can rupture and the regulators stem (tee handle or knob)
can blow out of the case like a gun shot.
This is first-hand knowledge; my life so far has
lasted 55 years LONGER than it would've if I'd been standing a couple inches to the right of where I was. Our resident "weldor" was shade tree trained, didn't know SQUAT about the dangers involved; new Oxy tank, he had NEVER backed off regulators - when he cracked open the tank valve, the
regulator stem missed my head by 2-3 inches, went through 3 plywood walls and bounced off a parked car outside.
After I "cleaned out my shorts", I drove to the LWS and asked if they had any safety pamphlets on O/A - they did, gave me one, and after I read it I knew a LOT more about the subject than our resident moron. From that day on I left the shop when he walked toward the O/A tanks. (He had already poo-poohed my info, already "knew it all" )
If you have ANY doubts about this, read this
Fuel your safety knowledge
If you're STILL not sure, I would find someone who actually KNOWS about O/A - I would STILL read the above link FIRST; it may help you know if your "expert" actually IS one... Steve