46 CFR 132.110 – Piping
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(a) Except as provided for liftboats by § 134.180 of this subchapter, each fitting, flange, valve, and run of piping must meet the applicable requirements of part 128 of this subchapter. Piping must be—
(1) Hot-dip galvanized;
(2) At least extra-heavy schedule; or
(3) Of a suitable corrosion-resistant material.
(b) Each distribution cut-off valve must be marked in compliance with § 131.820 of this subchapter.