---
kind: "section"
citation: "46 C.F.R. § 151.50-55"
title: "46"
number: "151.50-55"
heading: "Sulfur (molten)."
url: "https://uscodex.org/cfr/46/151.50-55"
---

# §151.50-55. Sulfur (molten).

- (a) **Ventilation (cargo tank)—**
  - (1) Cargo tank ventilation shall be provided to maintain the concentration of H2S below one-half of its lower explosive limit throughout the cargo tank vapor space for all conditions of carriage; i.e., below 1.85 percent by volume.
  - (2) Where mechanical ventilation systems are used for maintaining low gas concentrations in cargo tanks, an alarm system shall be provided to give warning if the system fails.
  - (3) Connections shall be provided to enable sampling of the atmosphere over the cargo in each cargo tank for analysis.
  - (4) The ventilation system shall be designed and arranged to preclude the depositing of sulfur within the system.
- (b) **Void spaces—**
  - (1) Openings to void spaces adjacent to cargo tanks shall be designed and fitted to prevent the entry of water, sulfur or cargo vapors.
  - (2) Connections shall be provided to enable sampling and analyzing vapors in void spaces.
- (c) Temperature controls shall be provided in accordance with [§ 151.20-10](/cfr/46/151.20-10.md) and applicable sections of [Subpart 151.40](/cfr/46/subpart151.40.md) of this part. Heat transfer media shall be steam, and alternate media will require specific approval of the Commandant.

## Notes

### Amendments

[CGFR 70-10, 35 FR 3714, Feb. 25, 1970]

### Authority

Authority: 33 U.S.C. 1903; 46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGFR 70-10, 35 FR 3714, Feb. 25, 1970, unless otherwise noted.

### Amendments

[CGFR 70-10, 35 FR 3714, Feb. 25, 1970]