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HALON
ALTERNATIVE GAS BASED SUPPRESSION SYSTEM
Fm
200 Gas Based System
- First
halon replacement to receive UL Listing.
- Most
effective of proposed HFC substitutes for HALON 1301 according
to the UL EPA SNAP list of acceptable Halon Alternatives.
- Effective
for use on Class A surface burning fires, Class B flammable
liquids and Class C electrical fires.
- Clean
and effective replacement.
- Does
not deplete stratospheric ozone.
- Viable,
long terms replacement agent.
- Safely
protects electronics, telecommunications and DP equipment.
- Included
in the NFPA 2001 Standard as one of the approved agents
for use in both occupied and non-occupied areas.
- Passed
stringent fire test requirement by branches of the US military.
- Requires
minimal additional system storage space.
Physical
Properties
| Description |
FM
200 |
HALON
1301 |
| Chemical
Structure |
CF3 |
CHFCF3 |
| Molecular
Weight |
170.03 |
148.95 |
| Boiling
Point (degree C) |
-
16.36 |
-
57.75 |
| Freezing
Point (degree C) |
-
131.00 |
-
168.00 |
| Critical
Temperature (degree C) |
101.70 |
67.00 |
| Critical
Pressure (atm) |
28.70 |
67.00 |
| Critical
Volume (ht/kg) |
1.61 |
|
| Critical
Density (kg/lt) |
0.621 |
0.745 |
| Heat
of Vaporization @ boiling point (kcal/kg) |
31.70 |
|
| Vapour
Pressure (bar) |
4.05 |
13.60 |
| Cup
Burner Extinguishing concentration (n-heptane, %v/v) |
5.80% |
3.50% |
| Inerting
Concentration |
|
|
| Methane |
8.00% |
4.00% |
| Propane |
11.60% |
8.00% |
| Temperature(oC) |
Liquid
Density(Kg/L) |
Vapour
Density(Kg/L) |
Vapour
Pressure(Bar) |
| 18 |
1.5340 |
0.0079 |
0.9410 |
| 00 |
1.4758 |
0.0159 |
1.9580 |
| 21 |
1.4032 |
0.0322 |
4.0400 |
| 55 |
1.2674 |
0.0861 |
10.469 |
Ozone
depletion potential (CFC - 11 = 1) = 0
Atmospheric Lifetime = 1 - 12 years
Lo (4 hrs. rating) Actute Toxicity = 800,000 ppm
Design concentration @ 70 F at sea level
3
(5%)
Halon 1301 - 0.0206 lb/ft.
(7%) FM 200 - 0.0341 lb/ft - 70% more agents by wt compared
to Halon 1301.
System
Concept
- Modular
system (single nozzle)
- Balanced
piping network
- Unbalanced
piping network
Method
Used Dependent On
- Quantity
of agent involved
- Economic
factors
- Number
of areas protected
- Available
storage space for cylinders
System
Design
- Determine
Hazard Volume and Area
- Agent
quantity :
W = v/s (c/100-c)
3
vin ft
3
s = ft/lb c = cone % by volume K
= 1.885
1
K = 0.0045
2
T = temp F
0
(At 70 F agent qty3 = 0.0341
lb/ft @ 7% concentration (at sea level)
- Determine
cone at Tmax
- Leakage
(check points - doors, ductwork, penetrations walls, block
walls.
- Elevation
corrections
(Above MSL, agent vol increases to greater
vol and thus c increases)
(e.g. system designed for 7% at 10,000
ft would require 34% less agent than same systems designed
for a 7% cone at sea level.
Below MSL, W increases,
Agent quantity increased or decreased
to compensate for elevation by using correction factors (e.g.
0 ft C = 1.0 + 100 ft - Cf = 0.96 - 1000 ft - CF = 1.04) f
- Container
selection
(System type, extent of ppg, floor space,
cost factor, mtg position, serviceability, floor loading,
container temperature)
-
Nozzle (size 3/8" to 2")
(Area coverage, clg ht obstructions, disch
rate, min nozzle orifice area, min nozzle pr, deflector plate)
- Ppg
network
(Tee split ration, Tee orientation, pipe
size, discharge time, min flow rate, min ppg distance, percentage
of agent in pipe, location of nozzle source).
- Manifolding
- (Centre exit M/F, end exit M/F, CEMF/M+R,
EEMF/M+R)
System
Installation
- Proper
strapping/bracketing of cylinders (clean, dry, vibration
free areas for cyl).
- Piping
(Teflon tape on male threads, ream, blow clear and swab
with solvent to remove dirt, rust and cutting oils).
- Mate
: Sch 40 or Sch 80 ASTM A53 or A106.
- Fittings
: m1 300# ASTM A - 197 (Reduction directly after tee with
tee size same as inlet line to tee).
- Pipe
hangers spaced at intervals 15 ft used to support 'dead
load'.
- Rigid
pipe supports to support 'live load' of the pipe system
during discharge.
- Rigid
bracing at each directional change fitting and back-bracing
to 180 nozzles.
- Nozzle
screen - convex side upstream.
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