A pressure relief device must be plainly and permanently marked with the—
(a) Set pressure rating;
(b) Rated flow capacity expressed as cubic feet of standard air (60 °F 14.7 psia) per minute and the pressure at which the flow capacity is determined;
(c) Manufacturer's name and identifying number; and
(d) Pipe size of inlet.
source: CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted.
cite as: 46 CFR 64.71