Discharge of NLS residue from a slop tank to the sea: Categories A, B, C, and D.

  1. Law
  2. CFR 46
  3. Shipping
  4. Coast Guard, Department of Homeland Security
  5. Certain Bulk Dangerous Cargoes
  6. Ships Carrying Bulk Liquid, Liquefied Gas, or Compressed Gas Hazardous Materials
  7. Operations
  8. Approval of Surveyors and Handling of Categories a, B, C, and D Cargo and NLS Residue
  9. Discharge of NLS residue from a slop tank to the sea: Categories A, B, C, and D.

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§ 153.1126 Discharge of NLS residue from a slop tank to the sea: Categories A, B, C, and D.

NLS residue in a slop tank may not be discharged into the sea unless -

(a) The ship meets the conditions for discharging the NLS residue from a cargo tank in § 153.1128; and

(b) For Category B NLS residue transferred to the slop tank under § 153.1119(b), the NLS is discharged -

(1) Through an NLS residue discharge system with the flow recording equipment required in § 153.481(b)(2) operating; and

(2) At a rate maintained at or below Q in the following:

For tank contents that are miscible

For tank contents that are immiscible

Q = KU1.4 L1.6 × 10−5 m3/hr

where:

Q = maximum permissible slops discharge rate in cubic meters per hour.

V = volume of slops in the tank in cubic meters.

K = 4.3, except K = 6.45 if Q is distributed between two NLS residue discharge outlets on opposite sides of the ship (see §§ 153.470(c) and 153.481(b)).

U = ship's speed in knots.

L = ship's length in meters.

N = number of tanks containing Category B NLS residue pumped into the slop tank.


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