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NOTE: This is an unformatted excerpt from our online fire protection training library.

Introduction to Clean Agents

Standards and Regulations on Clean Agents

Underwriters Laboratories and FM Global

Underwriters Laboratories Inc., through their standards UL 2166 "Standard for Halocarbon Clean Agent Extinguishing System Units" and UL 2127 "Standard for Inert Gas Clean Agent Extinguishing System Units," establish a baseline performance standard for the clean agent itself, the equipment used to employ the clean agent, and the methodology for designing the clean agent system. The UL listing process consists of several series of tests, with each series aimed at different aspect of the system. 
The agent test series aims at establishing the minimum agent concentration required to cause extinguishment of fires involving Class A and Class B fuels and includes tests with 0.23 m2 (2.5 ft2) n-heptane pan fire, wood crib fire, and polymeric material array fires. The equipment or component test series consists of hydrostatic pressure tests, accelerated aging tests, leakage tests, valve cycling tests and corrosion tests. The nozzle distribution test series involves two enclosures, one to establish the maximum area coverage and the other to establish the maximum nozzle height in an enclosure. The minimum nozzle pressure is established as the maximum utilized in the agent tests and the nozzle distribution tests.  The system design methodology is the subject of the flow calculation testing. During these tests, the methodology for prediction the nozzle pressures, discharge time and flow distribution between nozzles are tested experimentally. These tests establish the system design parameters/limits over which this methodology is valid. These system design parameters include discharge time range, type of flow divisions and division ratios, pipe volume ratios, minimum flow rate per pipe size, and cylinder fill density range.

FM Global, through their standard FM5600, establishes a similar performance baseline. Many clean agent system manufacturers go through the FM Global approval and UL listing process simultaneously to take advantage of the common elements of both programs.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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