800027-A 19 06/05/2023
4 SYSTEM DESIGN AND LIMITATIONS
4.1 General
The Firetrace series of FK-5-1-12 Self-Contained Automatic Indirect Units’ design limits were established and tested by Firetrace. The Units are
Listed by Underwriters Laboratories Inc, Underwriters’ Laboratories of Canada, and Approved by FM Approvals (please note these systems are FM
Approved for Class B fire applications only).
These units were subjected to numerous performance and fire tests (as specified in UL 2166 & FM 5600), in order to verify their suitability and to
establish design limitations for:
• Hazard volume
• Nozzle area coverage and heights
• Nozzle placement
• Discharge time and flow rates
• Design concentrations & design factors
• FDT placement
The self-contained automatic unit concept minimizes the amount of engineering required when evaluating a design for a specific application. So
long as the discharge piping and nozzles are installed within the limits prescribed in this Manual, no calculations are required for pressure drop, flow
rates, or discharge time. When the additional limitations of hazard volume, area coverage, maximum height, design concentration, agent quantity,
detector arrangement, etc., are also met, the unit installation can be understood to comply with the design requirements, NFPA 2001, the UL/UL-C
Listings, and FM Approvals. Therefore, no discharge tests or concentration measurements should be required.
NOTE: Firetrace Pre-Engineered ILP Automatic Suppression Units are designed and approved as an automatic unit. Firetrace ILP Units are not designed
to provide simultaneous actuation of two or more units. Under the approval, only one Firetrace Pre-Engineered ILP Automatic Suppression Unit can be
used to protect one enclosure, units shall not be combined to protect a larger enclosure.
Clean agent shall NOT be used on fires involving the following materials:
1. Certain chemicals or mixtures of chemicals, such as cellulose nitrate and gunpowder, which are capable of rapid oxidation in the
absence of air.
2. Reactive metals.
3. Metal hydrides.
4. Chemicals capable of undergoing autothermal decomposition.
4.2 Specifications
4.2.1 Storage and Operating Temperature Range
The Firetrace FK-5-1-12 Units and equipment are designed to be stored and operated at the ambient temperature range of 0°F to +130°F (-17.8°C to
+54.4°C).
4.2.2 System Operating Pressure
The normal operating pressure for the unit is 195 psig at 70°F (13.4 bar at 21°C).
Table 19 - Cylinder Pressure-Temperature Relationship shows the cylinder gauge pressure-temperature relationship based on a charging pressure of
195 psig at 70°F.
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