离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(51)

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Where foam is delivered from the monitors non-aspirated, there must be a system for providing aspirated foam to the Safe Landing Area (SLA) at the prescribed minimum delivery rate.
Proportioning accuracy of – 0% and +0.05% should be specified, particularly when using 1% AFFF compound.
Ensuring an immediate firefighting response at the helideck will require a readily available firewater supply at sufficient pressure to operate the monitors (e.g. a fire main with quiescent pressurisation).
Storage
Many installations and vessels have, in the past, specified central foam storage systems with either a pressurised ‘bag tank’ or pumped supply system.  
The disadvantages of this type of system are:
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The helideck monitors rely entirely on a remote foam supply (some distance from helideck)

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The system will invariably suffer a time delay getting foam to the monitor nozzles

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Any contamination of foam concentrate in the central storage tank will render the helideck non-operational

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A ‘one shot’ system should be avoided because the system cannot be operated without ruining the whole charge of concentrate.  It also limits opportunities for taking foam samples for analysis.

The advantages of a centralised system are:

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Less space required for equipment on the helideck monitor / access platforms

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Reduced foam storage tank system(s) maintenance.

Separate foam storage tanks located adjacent to each of the foam monitors are preferred because they offer:

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Quicker response times for foam production

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Any contamination of concentrate should be confined to one monitor. Thus if 3 monitors are installed and the helideck foam system is sized to provide coverage with any 2 monitors, the helideck remains operational

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Easier replenishment of foam tanks

Disadvantages of separate foam storage tanks are:

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More space required on helideck monitor / access platforms to house the equipment

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Additional equipment to maintain.

NOTE:  A ‘Certificate of Conformity’ should be available on the installation / vessel verifying the quality of the concentrate and foam mixture for the monitors and supplementary systems.  The systems should be tested annually and ‘finished’ foam samples should be analysed in a laboratory at regular intervals.
Apart from the foam concentrate contained in the system(s) tankage there is a requirement to maintain on board, sufficient drum stock to re-charge the systems. The selection of an appropriate storage area for the back-up foam supply should take into account potential exposure to contaminants and to adverse weather conditions that may affect the product performance.
11.5.6.4 Remote Operation
Monitors should be capable of remote initiation if not manned during helicopter landings.
　
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