.1 The system should be available for immediate
use and capable of continuously supplying water-based medium for at
least 20 min in order to suppress or extinguish the fire and to prepare
for the discharge of the main fixed fire-extinguishing system within
that period of time.
.2 The system and its components should be suitably
designed to withstand ambient temperature changes, vibration, humidity,
shock, impact, clogging and corrosion normally encountered in machinery
spaces. Components within the protected spaces should be designed
to withstand the elevated temperatures which could occur during a
fire. Components should be tested in accordance with the listed sections
of appendix A of MSC/Circ.1165, as
amended by MSC.1/Circ.1269, as modified
below:
|
MSC/Circ.1165, as amended by MSC.1/Circ.1269 Appendix A paragraph no.
|
Modifications
|
| 3.1 Dimensions
|
|
| 3.4.1 Flow constant
|
|
| 3.11.1 Stress corrosion
|
|
| 3.11.2 Sulphur dioxide
corrosion
|
Open nozzles should be subject to
post test visual examination. The requirements of paragraph 3.14.2 are not
applicable
|
| 3.11.3 Salt spray corrosion
|
The NaCl concentration used for the
test should be 20%. Following exposure, open nozzles should meet the flow
constant requirements of paragraph 3.4.1. The requirements of paragraphs
3.14.2 and 4.11.4.2 are not applicable
|
| 3.12 Integrity of nozzle
coating
|
Applicable only if the nozzles have
wax or bitumen coatings
|
| 3.15 Resistance to heat
|
|
| 3.16 Resistance to vibration
|
Open nozzles should be subject to
post test visual examination. The requirements of paragraphs 3.5 and 3.8 are
not applicable
|
| 3.17 Impact test
|
|
| 3.22 Clogging test
|
|
.3 The system and its components should be designed
and installed based on international standards acceptable to the Organizationfootnote, and manufactured and tested in accordance
with the appropriate elements of the appendix to these Guidelines.
.4 The electrical components of the pressure source
for the system should have a minimum rating of IPX4footnote if located in the protected space. Systems
requiring an external power source need only be supplied by the main
power source.
.5 The water supply for local application systems
may be fed from the supply to a water-based main fire-fighting system,
providing that adequate water quantity and pressure are available
to operate both systems for the required period of time. Local application
systems may form a section(s) of a water-based main fire-extinguishing
system provided that all requirements of SOLAS regulation II-2/10.5, these Guidelines, and MSC/Circ.1165, as amended by MSC.1/Circ.1237 and MSC.1/Circ.1269, are met, and the systems are capable of being isolated from
the other sections of the main system.
.6 A means for testing the operation of the system
for assuring the required pressure and flow should be provided.
.7 Spare parts and operating and maintenance instructions
for the system should be provided as recommended by the manufacturer.
.8 A fitting should be installed on the discharge
piping of open head systems to permit blowing air through the system
during testing to check for possible obstructions.