---
kind: "section"
citation: "46 C.F.R. § 148.135"
title: "46"
number: "148.135"
heading: "Stowage and segregation for materials of Class 4.3."
url: "https://uscodex.org/cfr/46/148.135"
---

# §148.135. Stowage and segregation for materials of Class 4.3.

- (a) Class 4.3 materials listed in Table 148.10 of this part which, in contact with water, emit flammable gases, must—
  - (1) Be kept as cool and dry as practical before loading;
  - (2) Not be loaded or transferred between vessels during periods of rain or snow;
  - (3) Be stowed separate from foodstuffs and all Class 8 liquids; and
  - (4) **Be stowed in a mechanically ventilated hold.** Exhaust gases must not penetrate into accommodation, work or control spaces. Unmanned barges that have adequate natural ventilation need not have mechanical ventilation.
- (b) The bulkhead between a hold containing a Class 4.3 material and incompatible materials must have cable and conduit penetrations sealed against the passage of gas and vapor.

## Notes

### Authority

Authority: 33 U.S.C. 1602; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; 46 U.S.C. 3306, 5111; 49 U.S.C. 5103; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: 75 FR 64591, Oct. 19, 2010, unless otherwise noted.