46 CFR § 153.558
Special requirements for phosphoric acid
April 15, 2021
A phosphoric acid containment system must be:
(a) Lined with natural rubber or neoprene;
(b) Lined with a material approved for phosphoric acid tanks by the Commandant (CG-ENG); or
(c) Made of a stainless steel that resists corrosion by phosphoric acid.
Note: “Phosphoric acid”, as defined in §153.2, includes phosphoric acid, superphosphoric acid, and aqueous solutions of phosphoric acid.
[CGD 73-96, 42 FR 49027, Sept. 26, 1977, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 88-100, 54 FR 40042, Sept. 29, 1989]
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