How long should a cylinder hold before it vents?
A. Our industrial cylinders have MAWP of 230, 350 and 500. The pressure building regulators are set at 125, 300 and 400 respectively. A cylinder which is operating within specification and not being used will build pressure at a rate of 30 – 35 psi/day, (O2, AR, N2). To determine holding time, subtract the working pressure from the MAWP and divide by 30 – 35. That will give a number of days holding time.
