Section 153.557 - Special requirements for hydrochloric acid(a) A containment system that carries hydrochloric acid must be lined with: (3) A material approved for hydrochloric acid tanks by the Commandant (CG-ENG).(b) Containment systems for contaminated hydrochloric acid are approved by the Commandant (CG-ENG) on a case by case basis.CGD 73-96, 42 FR 49027, Sept. 26, 1977, as amended by CGD 82-063b, 48 FR 4781, Feb. 3, 1983