Does anyone know the requirements to certify a calibration cylinder used for hyrdo? The only thing I've been able to dig up from Title 49 is that a "certificate of calibration must be maintained for each calibrated cylinder..." but I can't find any specs on on requirements to certify a calibration cylinder.
I know I can buy a "calibrated" cylinder from hydro-test of 3x the cost of a new cylinder (or ship them one to certify) but someone a while back also said anyone can basically certify their own calibration cylinder as long as they test and document the nominal expansion range? I've looked over the hydro-test calibration certificate that we have and it doesn't reference any specific code or authority. Just says, here's who tested it, when, cylinder specs, and acceptable expansion range.
I know I can buy a "calibrated" cylinder from hydro-test of 3x the cost of a new cylinder (or ship them one to certify) but someone a while back also said anyone can basically certify their own calibration cylinder as long as they test and document the nominal expansion range? I've looked over the hydro-test calibration certificate that we have and it doesn't reference any specific code or authority. Just says, here's who tested it, when, cylinder specs, and acceptable expansion range.
