4.11
The olfactory valve has a shut-off control to regulate the amount of air being discharged into the wheelhouse
(Figure 4-4).
4.12
All piping connections to the detection cabinet and suction blower housing must be made with flexible hose
couplings as shown in Figures 4-5 and 4-6.
4.13
Where detection system piping penetrates decks and bulkheads, they must be welded as shown in Figure 4-6.
4.14
Unused hose inlets to the detecting cabinet must be plugged as shown in Figure 4-7.
4.15
Under some conditions of operation, warm, moist air may be drawn through the CO2 system piping into colder
areas of the ship, forming condensation in the pipeline. If this condition is allowed to persist for a sufficient length
of time, the accumulated water could choke off the flow of air.
4-16.
To prevent the accumulation of water in the lines, automatic condensate drainage valves must be installed on
every low point of the CO2 system piping (see Figure 4-8). These valves permit moisture to drain at a vacuum of
approximately one inch or less water column, yet automatically seal off the flow of C02 at the time the system is
discharged.
4.17
Because the suction blower maintains a vacuum of six inches or greater water column, an automatic condensate
drain switch has been provided in the cabinet to momentarily stop the blower at regular intervals twice every 24
hours for 45 seconds each time).
4.18
Every line used for the CO2 extinguishment system must have a 3-way valve installed (see Figure 4-9).
4.19
All lines connected to a deep tank must have a stop installed between the 3-way valve and the detector cabinet
(see Figure 4-9) to permit isolation when liquid is carried in the tank.
4.20
When a space does not require CO2 system coverage, the piping may be run direct from the accumulators to the
detector cabinet (see Figure 4-9).
4.21
Two types of smoke accumulators may be used:
a.
Regular flush type (No. 63339)
b.
Weldable type (No. 964008) with back and side outlets
4-9
