Fike Clean Agent System - 3.3 Establish System Concept

SECTION 3 – SAMPLE PROBLEM
UL / ULC Ex4623 Fike Clean Agent System w/ FM-200™ Page 3 of 17
FM 3010715 Manual P/N: 06-215 (Rev G) Revision Date: January, 2010
3.3 ESTABLISH SYSTEM CONCEPT
This system has four areas that need fire protection – each with a different amount of agent for each enclosure
and different nozzle requirements. Of the three types of systems that we can apply to these hazard areas, the
most flexible is the unbalanced system.
3.3.1 CONTAINER SELECTION
This system requires a total of 448 lbs. (203.5 kg) of HFC-227ea to protect all four hazard areas, which allows us
to utilize a common agent supply. Refer to Table 2.4.2 for the container selections available.
Container size = 650 lb. (295 kg) with a 448 lb. (203.5 kg) fill weight
3.3.2 NOZZLES REQUIRED
Step 1: Determine the correct number and size of nozzle(s) required for each hazard area and calculate the
nozzle flow rate required to discharge the system in a maximum of 10 seconds.
Computer Room = 272 lbs./(123.5 kg) = 27.2 lbs. (12.35 kg) / sec ÷ 2 = 13.6 lbs. (6.17 kg) / sec
10 seconds Use 2 nozzles to get the flow rate under 20 lbs. (9 kg) / sec
UPS Room = 43 lbs./(19.5 kg)
= 4.3 lbs. (1.95 kg) / second
10 seconds Use 1 nozzle
Operations Room = 81 lbs./(37 kg)
= 8.1 lbs. (3.7 kg) / second
10 seconds Use 1 nozzle
Sub-Floor = 53 lbs./(24 kg)
= 5.3 lbs. (2.4 kg) / second
10 seconds Use 1 nozzle
Step 2: Determine the nozzle sizes based on the minimum and maximum pipeline flow rate and from the flow rate
established in Step 1.
Computer Room = 13.6 lbs. (6.17 kg) / second - Use (2) 2" (50 mm) nozzles
UPS Room = 4.3 lbs. (1.95 kg) / second - Use (1) 1" (25 mm) nozzle
Operations Room = 8.1lbs. (3.7 kg) / second - Use (1) 1 1/2" (40 mm) nozzle
Sub-Floor = 5.3 lbs. (2.4 kg) / second - Use (1) 1 1/4" (32 mm) nozzles