离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(53)

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When hydrants are specified for use in conjunction with an in-line foam inductor (with standpipe inserted into foam drum stock) and a foam branch pipe, proper consideration should be given to the time and effort required to assemble the equipment and for it to be used effectively.
Flaked Hoses, nozzles, etc., should be properly stored in easily accessible, weatherproof cabinets adjacent to the hydrants.
Foam Inductors
Foam inductors are used to proportion foam concentrate correctly into the fire water stream.  They can be mounted in a fixed position on foam storage tanks supplying concentrate to monitors or hosereel systems. They can also be portable, for example when used with drum stock.  
NOTE: Whichever system is used it is vital that the settings are fixed to the
correct concentrate percentage (e.g. 1, 3 or 6%) to avoid inadvertent
adjustment that will inevitably degrade the quality of delivered foam.

(Photograph courtesy of Angus Fire)
Foam Branch Pipes
Foam branch pipes (low expansion) can be used in conjunction with both hydrant and hoses or hose reel systems.
Their purpose is to generate aspirated foam to assist with good fire control. Branch pipes offer a flexible solution for gaining access to the seat of a helicopter fire where monitors may not be able to direct their foam streams effectively. Ideally, the branch pipes should be equipped with a shut off valve.

(Photograph courtesy of Angus Fire)
NOTE:  During helideck inspections, this equipment is not always found available at the helideck.  When they are located on site, they are often poorly maintained. Proper storage should be provided adjacent to the helideck.
Nozzles
A variety of jet / fog nozzles are available for firefighting duty.  The primary consideration when specifying them for use offshore is their ease of use and durability.

  (Photograph courtesy of Angus Fire)
11.5.9 Complementary Media
A variety of minor fire incidents can be encountered during helicopter / helideck operations. These incidents may include:
.  
Engine fires

.  
Avionic bay fires

.  
Transmission and hydraulic area fires

.  
Minor fuel leaks / fires.

To deal readily with such incidents, suitable and sufficient extinguishants should be
provided as noted in CAP 437.
The media commonly used are dry powder and CO2.

11.5.9.1 Specification
Complementary media are readily available in portable form either hand carried and / or trolley mounted. For the helideck, trolley mounted units provide the quantities specified in CAP 437.  However, hand portable units can be more useful in some minor firefighting applications (e.g. within a helicopter).
It should be noted that when specifying media for engine etc. bay fires, an extendable lance applicator should be included.
However, it is essential to check that the design of the locking ring to extend the lance is both secure and easy to operate.  This is to ensure that, when in use, failure or inadvertent operation of the lance extension is avoided.  
　
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