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A nozzle pressure of less than 5.5 bar is not likely to be sufficient to overcome the worst weather conditions likely to be encountered.
When designing a monitor system it is imperative to ensure that the overall height of the monitors relative to the helideck surface is adequate to ensure that the foam / water output can be properly applied to any part of the helideck. The height dimension should not exceed 250mm (see CAP 437). Where it becomes apparent that the height limitation may potentially be infringed, the designer should seek the advice of CAA or BHAB Helidecks.
Consideration should be given to specifying self-inducing foam nozzles with top entry foam input. This arrangement should prevent contamination of the stored concentrate.
Where adjustable inductor mechanisms are installed, it is essential to ensure the settings are correct for the percentage compound in use. This can be assured by fitting a locking system to the ‘change lever’.
Oscillating monitors should not be left pre-set on straight jet because of the hazards to escaping personnel and the relative ineffectiveness of the agent when applied in this manner.
Operating levers are preferred to wheels for physically actuating the monitor controls.
Monitors should be fitted with individual isolation valves suitably protected from potential crash damage.
11.5.6.3 Foam Type, Supply and Storage
Foam Type
The preferred compound for the helideck foam system is a low expansion, high performance AFFF (Aqueous Film Forming Foam) which is freeze protected (to at least -3°C, dependent on the operating region).
NOTE: When selecting suitable 'Type B' foam concentrates, duty holders should consider the requirement stated in CAP 437 to conduct annual tests of all parts of the foam production system including the finished foam.
The compound can be supplied in various percentages of concentration. 3% and 6% foams have a significantly greater range of acceptable operating tolerances when compared with 1% foams and, with this in mind, UK CAA recommends, where practical, that duty holders select a 3% or 6% Type B foam concentrate.
Supply
The system should be capable of continuously supplying foam (aspirated or non-aspirated) for at least 10 minutes at a rate not less than that prescribed by ICAO for Performance Level ‘B’ standard foam (e.g. 5.5 litres per square metre per minute).
NOTE: The performance standard is currently under review by European Aviation Authorities and may be subject to change in the future.
During helideck inspections, the HLO should be able to identify whether the foam monitors supply aspirated or non-aspirated foam and be knowledgeable of the delivery rate of the system.
Output of the monitors should be sufficient such that in the event of failure of one unit the remaining units can satisfy the helideck firefighting requirements for the largest helicopter certified to use the helideck. Full details should be provided to operations.
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离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(50)
