46 C.F.R. § 132.370
Added requirements for fixed independent and portable tanks
(a) When carrying fixed independent tanks on deck or portable tanks in compliance with § 125.110 of this subchapter, each vessel must also comply with §§ 98.30-37 and 98.30-39 of this chapter.
(b) When carrying portable tanks in compliance with § 125.120 of this subchapter, each vessel must also comply with 49 CFR 176.315.