CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES (parts 150 to 155) > PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS > SUBPART D—Test and Calculation Procedures for Determining Stripping Quantity, Clingage NLS Residue, and Total NLS Residue (§153.1600 to §153.1608) > 153.1608—Calculation of total NLS residue and clingage NLS residue.

153.1608—Calculation of total NLS residue and clingage NLS residue.

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

Code of Federal Regulations

Qclingage=1.1×10−4 Ad 1.5×10−5 Aw 4.5×10−4 L1/2 Ab
where:
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 meters
When using the formula in this paragraph, areas that are inclined more than 30° from the horizontal may be assumed to be vertical.

Code of Federal Regulations

Note: The Commandant (CG-522) (tel# 202-372-1425) 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]