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

eCFR graphic ec13no91.045.gif

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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