BS 5306-5.2:1984
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Code of practice for fire extinguishing installations and equipment on premises. Halon systems Halon 1211 total flooding systems
Hardcopy , PDF
08-25-2022
English
09-28-1984
Foreword
Committees responsible
Code of practice
0 Introduction
1 Scope
2 Definitions
3 Characteristics of Halon 1211
4 Planning
5 Contract arrangements
6 System design
7 System operation
8 Enclosure characteristics
9 System components
10 System design procedure
11 Maintenance
12 Safety
Appendices
A Deep-seated fires
B Examples of calculation of Halon 1211 quantity where
there is natural ventilation
C Examples of calculation of Halon 1211 quantity where
there is forced ventilation
D Example of design calculation for balanced system
E Example of design calculation for unbalanced system
Tables
1 Physical properties of Halon 1211
2 Quality of Halon 1211
3 Halon 1211 flame extinguishment concentrations
4 Halon 1211 inerting concentrations
5 Halon 1211 total flooding quantity
6 Pipes
7 Maximum pipework spans
8 Friction loss in screwed pipe fittings and valves
9 Friction loss in welded pipe elbows
10 Safety clearances to enable operation, inspection,
cleaning, repairs, painting and normal maintenance
work to be carried out
Figures
1 Isometric diagram of Halon 1211 pressurized to 25
bar at 21 deg C
2 Isometric diagram of Halon 1211 pressurized to 10.5
bar at 21 deg C
3 Pressure drop against mass flow rate for Halon 1211
in galvanized steel pipes
4 Mass flow rate per unit area against nozzle pressure
with Halon 1211/Nitrogen for nozzle type A
5 Mass flow rate per unit area against nozzle pressure
with Halon 1211/Nitrogen for nozzle type B
6 Type A nozzle
7 Type B nozzle
8 Example of balanced system
9 Example of Halon 1211 mass flow rate against
container pressure for balanced system
10 Example of unbalanced system
11 Example of Halon 1211 mass flow rate against
container pressure for unbalanced system
12 Label to be displayed at manual control
13 Label to be displayed at entrances to hazard
14 Extended mass flow rate of Halon 1211 to maintain
concentration in enclosures with openings
15 Initial amounts of Halon 1211 to produce a 2.5 %
(V/V) residual concentration in enclosures equipped
for mechanical mixing
16 Initial amounts of Halon 1211 to produce a 5 %
(V/V) residual concentration in enclosures equipped
for mechanical mixing
17 Initial amounts of Halon 1211 to produce a 7.5 %
(V/V) residual concentration in enclosures equipped
for mechanical mixing
18 Time required for interface between effluxing Halon
1211/air mixtures and influxing air to descend to
the centre of enclosures not equipped for mixing
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