The Po of a membrane tank must not exceed 24.5 kPa gauge (3.55 psig) unless special approval by the Commandant (CG-ENG) allows a Po between 24.5 kPa gauge (3.55 psig) and 69 kPa gauge (10 psig). [CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]