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

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

1. Modular system (single nozzle)
2. Balanced piping network
3. Unbalanced piping network

1. Quantity of agent involved
2. Economic factors
3. Number of areas protected
4. Available storage space for cylinders

1. Determine Hazard Volume and Area
2. 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) 
3. Determine cone at Tmax
4. Leakage (check points - doors, ductwork, penetrations walls, block walls.
5. 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
6. Container selection

(System type, extent of ppg, floor space, cost factor, mtg position, serviceability, floor loading, container temperature)
7. Nozzle (size 3/8" to 2")

(Area coverage, clg ht obstructions, disch rate, min nozzle orifice area, min nozzle pr, deflector plate)
8. 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).
9. Manifolding

(Centre exit M/F, end exit M/F, CEMF/M+R, EEMF/M+R)

System Installation

1. Proper strapping/bracketing of cylinders (clean, dry, vibration free areas for cyl).
2. Piping (Teflon tape on male threads, ream, blow clear and swab with solvent to remove dirt, rust and cutting oils).
3. Mate : Sch 40 or Sch 80 ASTM A53 or A106.
4. Fittings : m1 300#  ASTM A - 197 (Reduction directly after tee with tee size same as inlet line to tee).
5. Pipe hangers spaced at intervals 15 ft used to support 'dead load'.
6. Rigid pipe supports to support 'live load' of the pipe system during discharge.
7. Rigid bracing at each directional change fitting and back-bracing to 180 nozzles.
8. Nozzle screen - convex side upstream.

    

Projects & Credentials

• Consultancy
• Maintenance
• Project Job
• Supply