Sample Calculation For FM 200 Clean Agent: STEP 1: Determined Room Volume
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Mohd Zulhairi Mohd NoorSample Calculation For FM 200 Clean Agent: STEP 1: Determined Room Volume
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Mohd Zulhairi Mohd NoorSAMPLE
CALCULATION FOR FM 200 CLEAN AGENT
3
10
5
STEP 1: Determined Room Volume
L x W x H
10m x 5m x 3m = 150 m³
STEP 2: Determined Solid Object Volume
• Calculate volume of beam/duct/pillars or solid
object from in the room STEP 3: Minimum Agent Concentration
• NOTE : Assume this room to extinguish Class C Fire.
Solid Object = 0 m³
Hence, Design Concentration is = 7.5
Hence, Reduce Volume = 150 – 0 = 150 m³
SAMPLE CALCULATION FOR FM 200 CLEAN AGENT
STEP 4: Determine FM 200 Gas Quantity Note that
NFPA 2001 formula can be used; V = 150 m³ , c = 7.20% ,
v C Take Room Temperature say 21°C
W = x
s 100 C
Hence,
W = Weight of agent required in Kg (lb)
S = 0.1269 + 0.0005 (21) m
kg
³
= 0.1374 m
kg
³
V = Hazard volume in m³
m³ ft³ Hence,
S = specific vapor volume in or
kg lb
150 7.5
W = x = 81.94 Kg
where S = 0.1269 + 0.0005 T m ³ 0.1374 100 7.5
kg 100
or 1.885 + 0.0046 T ftlb³
SAMPLE CALCULATION FOR FM 200 CLEAN AGENT
STEP 5: Adjust Quantity For Agent With Altitude Correction Factor
For this calculation take altitude height at sea level
Hence, correction factor = 1
Wcorrection = weight of gas x altitude correction factor
Wcorrection = 81.94 x 1 = 81.94 Kg
SAMPLE CALCULATION FOR FM 200 CLEAN AGENT
STEP 6: Cylinder Selection
Note that 1 liter = 1 Kg
Hence;
Our Gas Weight is 81.94 Kg »» 82 Kg = 82 Liter
Cylinder selection must to nearest higher cylinder selection = 100 liter capacity
SAMPLE CALCULATION FOR FM 200 CLEAN AGENT
STEP 7: Nozzle Selection
Area of Room = L x W = 10 x 5 = 50 m²
Say we want to used 8 port type of nozzle
NOTE : Nozzle Maximum coverage area = 237.8 m²
Hence,
Area Of Room Covered
Quantity Of Nozzle Required = Area of Nozzle Coveraged
50
= = 0.21 unit »» 1 Unit
237.8
So we will install only 1 Nozzle in the room
STEP 8: Piping selection
Check what is the FM200 discharge time?
NOTE: FM200 is discharged into the risk within 10 seconds or less and suppresses the
fire immediately.
Hence,
81.94
Wper second = Weight of the gases
= = 8.19 Kg
Discharge Time 10 s
Refer Pipe Chart (from manufacturer cataloged) ;