SECTION 2 – DESIGN
UL / ULC Ex4623 Fike Clean Agent System w/ FM-200™ Page 1 of 39
FM 3010715 Manual P/N: 06-215 (Rev G) Revision Date: January. 2010
This section of the manual will detail the steps necessary to design a Fike HFC-227ea System. The first part of
this chapter will guide the user through the process of analyzing the requirements of the hazard(s) to be protected
and determining the amount of agent needed. The balance of the chapter will then address the specific hardware
and system design requirements to install the HFC-227ea system.
Fike offers two types of HFC-227ea systems – Pre Engineered and Engineered. Although similar, the designer
MUST fully understand the differences between the two concepts in order to apply the correct requirements to
their project. Therefore, the two concepts are divided into separate sections within this chapter.
The design of the system and its associated piping network MUST be verified by performing the calculations
outlined in the Pre Engineered or Engineered sections of this chapter prior to installing any HFC-227ea system.
Each calculation method has been investigated for specific types of fittings, piping, and inside pipe diameters. If
the specified limitations are not maintained, the system may not supply the required quantity of extinguishing
agent.
2.1 DETERMINE HAZARD TYPE
The Hazard Type generally falls into one of the three following categories, and sometimes a combination thereof.
The designer must be aware of the Hazard Type to determine the correct design concentration, agent quantity,
etc. The three Hazard Types are:
Class “A” (wood, paper, cloth – anything that leaves an ash residue after combustion)
Class “B” (flammable liquids)
Class “C” (electrical)
2.2 DETERMINE CONCENTRATION PERCENTAGE
The following is a guideline to be used in determining the proper agent concentration percentage for the hazard(s)
being protected. For combinations of fuels (hazard types) the design value for the fuel requiring the greatest
concentration MUST be used. (Reference: NFPA 2001, Section 3)
2.2.1 CLASS “A” or Class “C” HAZARDS – AUTOMATICALLY ACTIVATED
Systems that incorporate the use of a Detection & Control System for the purpose of automatically discharging
the HFC-227ea into the protected space can be designed for a 6.25% concentration.
2.2.2 CLASS “A” or Class “C” HAZARDS – MANUALLY ACTIVATED
Systems that DO NOT
incorporate the use of a Detection & Control System for the purpose of automatically
discharging the HFC-227ea into the protected space MUST
be designed for a 6.8% concentration. This is due
to the slower activation times that could be expected from a manually activated system and the potential for a
larger fire size to be extinguished.
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