46 CFR §153.491

1. (a)The Coast Guard waives §§ 153.440(a)(3), 153.480, 153.481, 153.482, and 153.488 and endorses a ship's Certificate of Inspection or Certificate of Compliance allowing a cargo tank to carry a single, specific NLS cargo and no other cargo if the ship's owner—
   1. (1)Requests a waiver following the procedures in § 153.10; and
   2. (2)Pledges in writing that while any waiver is in effect the cargo tank will—
      1. (i)Carry only the NLS cargo listed on the Certificate of Inspection or Certificate of Compliance;
      2. (ii)Carry no cargo other than the NLS; and
      3. (iii)Not be washed or ballasted unless the wash water or ballast water is discharged to a reception facility.
2. (b)The Coast Guard waives §§ 153.470 and 153.490(a)(2) if—
   1. (1)The ship's owner requests a waiver following the procedures in § 153.10;
   2. (2)The Coast Guard has issued a waiver to each of the ship's NLS cargo tanks under paragraph (a) of this section; and
   3. (3)The ship's owner adds to the ship's operational manual any provisions for preventing NLS discharge specified by the Commandant (CG-ENG) as a condition for issuing the waiver.