Section 32.60-35 - Tank vessels carrying Grade A liquid cargo-TB/ALL(a) Grade A liquids having a Reid vapor pressure in excess of 25 pounds per square inch shall be transported in cargo tanks which are independent of the hull.(b) Barges carrying Grade A liquids having a Reid vapor pressure in excess of 25 pounds per square inch shall be of a Type III barge hull as defined in § 32.63-5(b)(3) .CGFR 70-10, 35 FR 3709, Feb. 25, 1970