(a) The total NLS residue for each tank is calculated by adding the stripping quantity and the clingage NLS residue.

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(b) The clingage NLS residue for each tank is calculated using the following formula:

Qclingage = 1.1 × 10?4 Ad + 1.5 × 10?5 Aw + 4.5 × 10?4 L1/2 Abwhere:Ab = Area of the tank bottom added to the area in square meters of tank structural components projected on a horizontal surface Ad = Area of the tank underdecks added to the area in square meters of tank structural components projected on a horizontal surface Aw = Area of the tank walls added to the area in square meters of tank structural components projected on a vertical surface L = Length of tank in meters from fore to aft Qclingage = volume of clingage in cubic metersWhen using the formula in this paragraph, areas that are inclined more than 30° from the horizontal may be assumed to be vertical.Note:

The Commandant (CG-ENG) (telephone number 202-372-1420) has information that may be useful in approximating surface areas of typical structural members for the projected area calculations under § 153.1608(b).

[CGD 81-101, 52 FR 7788, Mar. 12, 1987, as amended by USCG-2006-25697, 71 FR 55747, Sept. 25, 2006; USCG-2012-0832, 77 FR 59785, Oct. 1, 2012]