46 C.F.R. § 153.470 System for discharge of NLS residue to the sea: Categories A, B, C, and D.
Title 46 - Shipping
Unless waived under §153.491, each ship that discharges Category A, B, or C NLS residue, or Category D NLS residue not diluted to (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:
where: D=Minimum diameter of the discharge outlet in meters. Qd=Maximum rate in cubic meters per hour at which the ship operator wishes to discharge slops (note: Qd affects the discharge rate allowed under §153.1126(b)(2)). L=Distance from the forward perpendicular to the discharge outlet in meters. φ=The acute angle between a perpendicular to the shell plating at the discharge location and the direction of the average velocity of the discharged liquid. (b) Location of an NLS residue discharge outlet. Each NLS residue discharge outlet must be located— (1) At the turn of the bilge beneath the cargo area; and (2) Where the discharge from the outlet is not drawn into the ship's seawater intakes. (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. [CGD 81–101, 52 FR 7781, Mar. 12, 1987, as amended by CGD 81–101, 53 FR 28974, Aug. 1, 1988 and 54 FR 12629, Mar. 28, 1989; CGD 95–028, 62 FR 51209, Sept. 30, 1997]
Title 46: Shipping
PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS
Subpart B—Design and Equipment
Design and Equipment for Pollution Control
§ 153.470 System for discharge of NLS residue to the sea: Categories A, B, C, and D.