FK-5-1-12 provides for the first time the possibility
of a 1 to 1 cylinder replacement, in addition to
utilizing the previously installed piping.
Preliminary testing and now, firsthand experi-
ence with existing installations around the world,
has proven that a SEVO 1230, FM approved,
increased pressure system, can replace a conven-
tional 25 bar (360 psig) halon 1301 system by only
replacing the nozzles, the cylinder and the agent.
By increasing the storage pressure in the cylinder,
the system using FK-5-1-12 allows for additional
pressure to reuse existing halon 1301 piping while
achieving the required minimum nozzle pressures.
The following examples show four (4) halon
1301 systems, engineered at 25 bar (360 psig),
10.0 second discharge time, with an average
nozzle pressure of 4.5-7.6 bar (60-110 psig) that
can be successfully replaced with the SEVO 1230
"One for One" retrofit system. Each application
was designed for replacement with a SEVO 1230
increased pressure system while utilizing the exist-
ing halon piping. The halon 1301 cylinders were
replaced 1 to 1 with SEVO 1230 cylinders filled
with FK-5-1-12 (Novec 1230 fluid), requiring only
new SEVO 1230 nozzles to achieve the approval
requirements and the minimum required nozzle
pressure.
Innovative delivery system
Since the developed countries' 1993 manufactur-
ing phase out of substances that deplete the
ozone layer per the Montreal Protocol, there has
been, and continues to be, an effort to develop a
direct 1 for 1 replacement for systems using halon
1301 (bromotrifluoromethane). Fire protection
equipment manufacturers offer alternate tech-
nologies using hydrofluorocarbons (HFCs) or inert
gases to replace previously protected hazards by
halon 1301. Some of these companies, along with
SEVO Systems, offer systems using FK-5-1-12
(Novec 1230 fluid) at either 360 psig or 600 psig.
These new clean fire extinguishing agents require
higher design concentrations and thus greater
agent mass quantities to achieve comparable fire
extinguishing performance to that of halon when
used in total flooding applications. This requires
that the design of a fire suppression system must
allow for larger quantities of agent than the initial
halon 1301 equipment provided. The storage
cylinders require larger capacity and in the past,
more cylinders. Substantial revisions to the delivery
systems, nozzles and pipe are required to deliver
the increased material quantity and in many cases,
at an unacceptably long discharge time of greater
than 10 seconds for systems employing halocar-
bon agents. The higher cost to revise and replace
the halon distribution systems and the additional
floor space required for additional cylinders have
largely prevented many halon 1301 protected
applications from direct conversion.
A number of HFC clean agents have been used
in standard 25 bar (360 psig) hardware to replace
the halon 1301 in existing applications. These
higher Global Warming materials may require
longer system discharge times. The inert gases
require much higher operating pressures and
therefore cannot be used in existing low pressure
piping networks. There are various deadlines
around the world for halon 1301 removal and
replacement and growing pressures to eliminate
38 INTERNATIONAL FIRE PROTECTION
SEVO 1230 "TRUE RETROFIT", "ONE FOR ONE" SYSTEM
NOVECTM 1230
TYPE (1) CLASS "C" (2) CLASS "A" (3) CLASS "B" (4) CLASS "A"
Manufacturer Ansul SEVO Chemetron SEVO Fike SEVO Pyrotronics SEVO
Hazard Design 6.0% 6.0% 5.0% 4.20% 7.0% 5.85% 5.0% 4.2%
Hazard Size 5018 5018 3155 3155 7260 7260 1456 1456
Size/Fill (lbs) 200/125 322/277 65 164/120 215 601/390 30 76/56
Pipe Size (in) 2 2 1.25 1.25 2.0/1.5 2.5/2.0/1.5 1 1
Pipe Equivalent 75 77 73 75 105 114 115 117
length (ft)
Nozzle Size (in) 2 2 1.25 1.5 2) 1.5 2) 1.5 1 1
Average Nozzle 124 75 125 76.4 135 75.6 140 80.9
Pressure (psig)
Discharge Time(s) 7.8 8.0 7.4 8.7 8.0 8.3 9.0 9.1
EXAMPLES
(1) A Class "C" 142 m3 (5018 ft3) hazard protected by an AnsulTM 6% halon 1301 system. The initial system design
calculations using Ansul's listed software calls for a 125 lb. filled halon 1301 cylinder using single 2" nozzle and pipe
network. A design concentration of 6.0% for FK-5-1-12 fluid is used in this comparison.
(2) A Class "A" 89 m3 (3155 ft3) hazard protected by a ChemetronTM 5% halon 1301 system. The initial system
was provided per the Beta pre-calc computer generated calculation using 65 lbs. filled halon 1301 cylinder and a
11
/4" nozzle with associated pipe network. A design concentration of 4.2% for FK-5-1-12 fluid is used in this
comparison.
(3) A Class "B" 205.6 m3 (7,260 ft3) hazard protected by a FikeTM 7% halon 1301 system. The initial system was
provided in accordance with Fike's pre-engineered Halon 1301 manual with 215 lb. filled halon 1301 cylinder using
a 2" pipe network and 2) 11
/2" nozzles. A design concentration of 5.85% for FK-5-1-12 fluid is used in this
comparison.
(4) A Class "A" 41.2m3 (1,456 ft3) hazard protected by a PyrotronicsTM 5% system. The initial system design calcu-
lated per their approved software provided for a 30 lb. filled halon 1301 cylinder using a 1" pipe network and
1" nozzle. A design concentration of 4.2% for FK-5-1-12 fluid is used in this comparison.

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