Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 4 - Special Detailed Requirements Based on Use and Occupancy
Section 421 - HYDROGEN CUTOFF ROOMS
Subsection 421.6 - Gas detection system

Universal Citation: 780 CMR MA Code of Regs 421.6

Current through Register 1531, September 27, 2024

Hydrogen cutoff rooms shall be provided with an approved flammable gas detection system in accordance with Sections 421.6.1 through 421.6.3. [F]

421.6.1 System design. The flammable gas detection system shall be listed for use with hydrogen and any other flammable gases used in the room. The gas detection system shall be designed to activate when the level of flammable gas exceeds 25 percent of the lower flammability limit (LFL) for the gas or mixtures present at their anticipated temperature and pressure. [F]

421.6.2 Operation. Activation of the gas detection system shall result in all of the following: [F]

1. Initiation of distinct audible and visual alarm signals both inside and outside of the cutoff room.

2. Activation of the mechanical ventilation system.

421.6.3 Failure of the gas detection system. Failure of the gas detection system shall result in activation of the mechanical ventilation system, cessation of hydrogen generation and the sounding of a trouble signal in an approved location. [F]

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