# 46 CFR § 153.486: Design and equipment for removing NLS residue by ventilation: Categories A, B, C, and D

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-46-153.486

## Section

- **Citation:** 46 CFR § 153.486
- **Heading:** Design and equipment for removing NLS residue by ventilation: Categories A, B, C, and D
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 46—Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES > PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS > Subpart B—Design and Equipment > Design and Equipment for Pollution Control

## Text

(a) If NLS residue is to be removed from a cargo tank by ventilation, in addition to the equipment required under paragraph (b) of this section the ship must have—
(1) Openings in the tank deck near the sump or suction point;
(2) If the openings required by paragraph (a)(1) of this section are insufficient, an access opening for visually determining whether liquid remains in the sump area of the cargo tank after ventilation or some other means for making this determination; and
(3) An approved Procedures and Arrangements Manual with instructions that meet § 153.490(b)(3).
(b) Unless the ship operator shows that the ventilation equipment specified in this paragraph will be available from shore when needed, if NLS residue is to be removed from a cargo tank by ventilation, in addition to the equipment required under paragraph (a) of this section the ship must have—
(1) Portable forced air ventilating equipment fitting the ventilation openings required in paragraph (a) of this section and able to ventilate the extremities of the tank to the extent prescribed in Appendix C of the IMO Standards for Procedures and Arrangements for the Discharge of Noxious Liquid Substances, Resolution MEPC 18(22), 1985; and
(2) A connector that allows a fan or air supply to be connected to the hose connections for the tank at the manifold.
Note:
The Clean Air Act (42 U.S.C. 7401 et seq.) allows states to regulate emissions from tank ventilation. There may be other regulations, both local and Federal, that affect the use of tank ventilation for safety or environmental purposes.

## Nearby sections

- [46 CFR § 153.190 § 153.190 Stability requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.190.md)
- [46 CFR § 153.201 § 153.201 Openings to accommodation, service or control spaces.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.201.md)
- [46 CFR § 153.208 § 153.208 Ballast equipment.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.208.md)
- [46 CFR § 153.209 § 153.209 Bilge pumping systems.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.209.md)
- [46 CFR § 153.214 § 153.214 Personnel emergency and safety equipment.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.214.md)
- [46 CFR § 153.215 § 153.215 Safety equipment lockers.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.215.md)
- [46 CFR § 153.216 § 153.216 Shower and eyewash fountains.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.216.md)
- [46 CFR § 153.217 § 153.217 Access to enclosed spaces and dedicated ballast tanks.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.217.md)
- [46 CFR § 153.219 § 153.219 Access to double bottom tanks serving as dedicated ballast tanks.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.219.md)
- [46 CFR § 153.230 § 153.230 Type I system.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.230.md)
- [46 CFR § 153.231 § 153.231 Type II system.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.231.md)
- [46 CFR § 153.232 § 153.232 Type III system.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.232.md)
- [46 CFR § 153.233 § 153.233 Separation of tanks from machinery, service and other spaces.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.233.md)
- [46 CFR § 153.234 § 153.234 Fore and aft location.](https://www.frixlaw.com/law-library/statutes/ecfr-46-153.234.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-46-153.486. Check the current official text before relying on it. Not legal advice.