StacksVerified U.S. regulatory reference

46 CFR §153.470

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Unless waived under § 153.491, each ship that discharges Category A, B, or C NLS residue, or Category D NLS residue not diluted to 1/10th of its original concentration, into the sea under §§ 153.1126 and 153.1128 must have an NLS residue discharge system meeting the following:
  1. (a)Minimum diameter of an NLS residue discharge outlet. The outlet of each NLS residue discharge system must have a diameter at least as great as that given by the following formula:
  2. (b)Location of an NLS residue discharge outlet. Each NLS residue discharge outlet must be located—
    1. (1)At the turn of the bilge beneath the cargo area; and
    2. (2)Where the discharge from the outlet is not drawn into the ship's seawater intakes.
  3. (c)Location of dual NLS residue discharge outlets. If the value of 6.45 for K is used in § 153.1126(b)(2), the NLS residue discharge system must have two outlets located on opposite sides of the ship.