Letter from the Editor: Welcome to the July 2012 issue of Fire Protection Engineering Emerging Trends, Fire Protection Engineering magazine’s e-newsletter. Each issue will highlight a new trend and/or innovation in the fire protection engineering industry. This issue will focus on clean agent design requirements.
Please enjoy the July issue and thank you for your continued support!
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Clean Agent Design Requirements Continue to Evolve
By: Jeff L. Harrington, P.E., FSFPE
Clean agents were originally advanced as “halon alternative options”. Prior to the Montreal Protocol and the U.S. Clean Air Act of 1990,2 Halon 1301 and carbon dioxide (CO2) were the two gaseous agents in predominant use in fixed, total-flooding extinguishing systems. Halon 1301 had an advantage over CO2 for normally-occupied spaces because it did not adversely affect humans at design concentrations necessary to extinguish fires. CO2 was a common choice for total-flooding, normally-unoccupied spaces and local applications.
Life with CO2 and Halon 1301 was simple. Each agent had its own NFPA design and installation standard: NFPA 123 for CO2 and NFPA 12A4 for Halon 1301. In each of these standards, only one agent was addressed. Then, Halon 1301 was phased out of production in response to the new environmental protection regulations. Not one, but many new agents were developed to replace Halon 1301.
NFPA 20015 was the new standard created to address the halon alternative agents, dubbed “clean agents”. NFPA 12A was used as a template to create the new NFPA 2001. To accommodate a growing number of new clean agents, NFPA 2001 evolved into a document with more complexities and a broader scope than NFPA 12A.
For example, new science was adapted and applied to develop guidelines for each new clean agent to provide safety to humans that might be exposed to the minimum design concentration. Refinements in the cup burner apparatus and test procedure were also implemented to provide more accurate determinations of minimum extinguishing concentrations for Class B fuels and more uniformity between test laboratories. The safety factor applied to the minimum extinguishing concentration to determine the minimum design concentration was increased from 1.2 to 1.3 for Class B fuels. Furthermore, a new standard test method was implemented to determine the minimum extinguishing concentration for Class A fuels with surface burning.
NFPA 2001 continues to evolve. The 2012 edition of NFPA was acted on by NFPA at its Association Technical Meeting in June 2011, and issued with an effective date of August 31, 2011. This latest edition contains numerous revisions, three of which will be detailed in this article. These revisions are:
- Requirement to supervise in-place actuators
- Class A surface fire hazard design concentration safety factor modification
- Class C fire hazard design concentration safety factor increase
Supervision of Electric Actuators in Place
The standard now requires [Section 220.127.116.11 and 18.104.22.168] that electric actuators on agent storage container discharge valves and selector valves be supervised in place. Their removal must cause an audible and visible indication at the system releasing control panel. The standard also states that these requirements shall become effective on January 1, 2016.
Electric actuators are routinely removed from the discharge and selector valves that they control to facilitate periodic testing. It is not uncommon for one or several of the electric actuators to remain unattached after the testing work has been completed. This leaves the clean agent system in an impaired state, with no indication that it is impaired.
This revision to the standard is intended to require clean agent system manufacturers to provide a means to supervise the attachment of electric actuators to the discharge or selector valve that they control, and to give them time to develop the necessary technology and manufacturing processes to implement it.
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Modification of Class A Minimum Design Concentration Safety Factor
The previous (2008) edition of NFPA 2001, Section 22.214.171.124, required that a safety factor of 1.2 be applied to the minimum extinguishing concentration to determine the minimum design concentration for Class A surface fire hazards. This has been revised in the 2012 edition to require the minimum design concentration for Class A surface fire hazards to be the greater of 1.2 times the minimum extinguishing concentration determined according to Section 126.96.36.199, or the equivalent of the minimum extinguishing concentration for heptane as determined according to Section 188.8.131.52.
The committee’s intent in making this change was to provide a method of determining the minimum design concentration for Class A surface fire hazards that was hardware-independent for all agents.
Increase in Class C Fire Hazard Safety Factor
The minimum design concentration for a Class C fire hazard, in previous editions of NFPA 2001, was required to be at least the same as for a Class A surface fire hazard for any given clean agent. There were no other requirements pertaining to Class C fire hazards.
The committee recognized that Class C fire hazards might have characteristics different from Class A surface fire hazards, and that some of these differences could influence the minimum extinguishing concentration and, therefore, the minimum design concentration.
A Fire Protection Research Foundation report6 showed that there is both theoretical and empirical support for the notion that Class C fire hazards require a higher quantity of clean agent to reliably extinguish them than corresponding Class A fire hazards. The report outlines the fundamentals for an appropriate test method and apparatus that could be used for determining the appropriate minimum extinguishing concentration for Class C fire hazards for each clean agent. In February 2009, the Fire Protection Research Foundation conducted a workshop devoted to the subject of this project to review the report and develop direction for the next steps. A summary of this workshop was published.7
This recent work, coupled with several years of evaluation by the committee, resulted in a change in the 2012 edition of NFPA 2001 regarding the method of determining the minimum design concentration for Class C fire hazards. The standard now states, in Section 184.108.40.206, that the minimum design concentration for Class C fire hazards shall be the minimum extinguishing concentration, as determined from 220.127.116.11, multiplied by a safety factor of 1.35.
The clean agent industry continues its work to develop a test protocol and test apparatus for determining minimum extinguishing concentrations for Class C fire hazards.
Jeff L. Harrington is with Harrington Group, Inc.
- The 1987 Montreal Protocol on Substances that Deplete the Ozone Layer, United Nations Environment Programme, Nairobi, 1987.
- Title VI - Stratospheric Ozone Protection, Clean Air Act, S.1630.ENR, U.S. Senate, Washington, DC, 1990.
- NFPA 12, Standard on Carbon Dioxide Fire Extinguishing Systems, National Fire Protection Association, Quincy, MA, 2011.
- NFPA 12A, Standard on Halon 1301 Fire Extinguishing Systems, National Fire Protection Association, Quincy, MA, 2009.
- NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems, National Fire Protection Association, Quincy, MA, 2012.
- Linteris, G., "Clean Agent Suppression of Energized Electrical Equipment Fires", Fire Protection Research Foundation, Quincy, MA, January 2009.
- Clean Agent Suppression of Energized Electrical Equipment Fires, Workshop Held in Conjunction with SUPDET 2009: Fire Protection Research Foundation, Quincy, MA, February 24, 2009.
2nd Quarter 2012 - Date Line 2012: Issues and Future Directions for Water Mist Fire Protection Systems
– Jack Mawhinney, P.E., FSFPE
Jack Mawhinney explains the origins of NFPA 750, the committee charged with writing an installation standard for water mist systems, and provides a preview of some of the issues that will be addressed in the next edition of NFPA 750, which is due in 2013. Mawhinney addresses some common misconceptions about water-mist systems, discusses the role of manufacturers, and stresses the importance of including ongoing maintenance costs while calculating life-cycle costs.
2nd Quarter 2010 - Fire Protection in an Environmentally Sustainable World
– Casey Grant, P.E., FSFPE
Concepts involving fire protection and those involving environmental sustainability share the common goal of making the world a better place. The environment is a key realm of focus in today's mainstream discussions of sustainability - included alongside debate on social and economic sustainability. Focusing on environmental sustainability shows the commonalities with fire protection. The fire protection community has already faced serious concerns about preserving the environment, and has faithfully risen to address these challenges. Perhaps most notably is the phase-out of production of fire protection Halons.
2012 ANNUAL MEETING: SFPE Professional Development Conference and Exposition
Mark your calendars for the 2012 ANNUAL MEETING: SFPE Professional Development Conference and Exposition being held October 14-19 at the Hyatt Regency in Savannah, GA. Join leaders in the profession for a unique educational experience that is designed to keep you a step ahead. The two-day Engineering Technology Conference highlights presentations on advanced and cutting-edge practices in fire protection engineering. Following the conference is the SFPE Professional Development Week which encompasses a series of twelve seminars taught by the profession’s leading experts. Also included is the 10th Engineering Technology Exposition on Tuesday, October 16, featuring the latest products, advances and solutions for your technical challenges.
For more information, visit http://www.sfpe.org/SharpenYourExpertise/Education/2012SFPEAnnualMeeting.aspx
Join the Society of Fire Protection Engineers
The Society of Fire Protection Engineers (SFPE) is the professional organization that represents fire protection engineers worldwide. Through its membership of over 5,000 professionals and 63 chapters, SFPE advances the science and practice of fire protection engineering internationally.
For more information, visit http://www.sfpe.org/GetInvolved/Membership/Join.aspx.
Careers in Fire Protection Engineering
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SFPE Job Board
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http://jobs.sfpe.org/ is designed for communicating the availability of employment opportunities in the fire protection engineering market. This special job board is ideal both for those seeking to fill positions and those looking for employment opportunities in fire protection engineering.
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Whether you're looking to make a career move, or you need to fill a fire protection engineer opening, http://jobs.sfpe.org/ is just a click away!