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Example text
FIG. 13. P. ) (for piped foam installations). Foam Branchpipe Figure 14 shows a modern Pyrene Co. Ltd. FB5X light alloy foam making branchpipe for use with the portable knapsack tank outfit. It is fitted with a water shut-off valve and a control wheel for regulating the foam compound induction rate. No moving controls come into contact with the concentrated compound except the ball of a non-return valve in the compound inlet connexion. D 29 SHIP FIRE PREVENTION Data Length, i8J in. Diameter, 3 \ in.
Sprinkler heads. Sprinkler Heads The sprinkler head (Fig. 11) is a small simple fitting, screwed externally for connexion to the water pipe. It contains a fluid-filled 23 SHIP FIRE PREVENTION quartzoid bulb which holds a diaphragm valve securely across the water pipe end. The fluid used is compressible, has a high coefficient of thermal expansion, and is hermetically sealed within the bulb with a bubble above the liquid at normal temperature. If the FIG. I I . Sprinkler head. temperature rises, the bubble shrinks and finally disappears, and further expansion of the fluid is then at the expense of the bulb.
31 SHIP TIRE PREVENTION FIG. I6. Foam making sprinkler head. Twin Tank Sets The foam compound in the tanks is pressurized by water and the amount of water entering the tank is indicated on a flow meter. This reading shows the amount of compound displaced. When a 32 DETAILS OF FIRE-FIGHTING EQUIPMENT tank becomes empty of compound a two-way cock is switched over, the second tank comes into operation and the first is vented, drained, and refilled ready for continuous action. The Pyrene Mechanical Foam Unit (Fig.