Inert Gas Clean Agent Extinguishing System Units

Designation Number:
ANSI/CAN/UL/ULC 2127
Standard Type:
National Standard of Canada - Domestic
Standard Sub-Type
Joint Canada-U.S. National Standard
Standard Development Activity:
Amendment Revision
ICS code(s):
13.220.20
Status:
Proceeding to development
SDO Comment Period Start Date:
SDO Comment Period End Date:
Posted On:

Scope:

These requirements cover the construction and operation of inert gas clean agent fire extinguishing system units intended to be installed, inspected, tested, and maintained in accordance with the Standard for Clean Agent Fire Extinguishing Systems, NFPA 2001 and with the National Fire Code of Canada.

Project need:

The existing requirement to operate all system cylinders within 1-second maximum time interval between the first and last cylinder/valve assembly may be overly restrictive. The 1-second requirement is important for the chemical clean agent fixed extinguishing systems of UL 2166 (and the prior UL 1058) given the short system discharge time of 10 seconds and to ensure multiple cylinders can discharge the two-phase agent into the shared manifold in a timely manner. It appears the requirement was carried forward into the UL 2127 inert gas extinguishing systems standard. With the duration of inert gas system discharges (typically 60 seconds and often up to 120 seconds) and the likelihood of installations incorporating a significantly greater number of cylinders than corresponding chemical clean agent systems, an increase in the permissible actuation time is reasonable. Large installations may necessitate longer actuation system lengths and the present 1-second requirement may be restricting these installations unnecessarily. There is also a typographical reference in Clause 30.2 that needs to be corrected.

Note: The information provided above was obtained by the Standards Council of Canada (SCC) and is provided as part of a centralized, transparent notification system for new standards development. The system allows SCC-accredited Standards Development Organizations (SDOs), and members of the public, to be informed of new work in Canadian standards development, and allows SCC-accredited SDOs to identify and resolve potential duplication of standards and effort.

Individual SDOs are responsible for the content and accuracy of the information presented here. The text is presented in the language in which it was provided to SCC.