Open Paved Catchment areas in this case are typically >600 square metres
Clean rainfall arriving on the catchment when the helipad in not is use is directed to stormwater
Typical stormwater Rainfall IFD requires calculation, but will on most cases be >20.0 L/sec and <40.0 L/Sec
The risk of aviation fuel spillage becomes apparent during landing and take-off events at the helipad
Stormwater discharge to the environment requires @ <5ppm hydrocarbon content = Current Industry Best Practice
Installation of a fuel spill retention, isolation and alarm system is required to manage this environmental risk
Ideally the aviation fuel spill retention capacity needs to be 2000 litres
The system requires the ability to isolate the stormwater discharge in the event of a major spill
The system requires an accumulated spill detection alarm to notify when the collection tanks requires evacuation of the floating layer of hydrocarbon
Refer “Alarms” drop down tab for further information
The Alarm system requires an Intrinsically Safe barrier and sensing module as the air space above the water level in the collection tank is classed as a zone 1 explosive hazard
Collection pits or gratings are installed in the catchment pavement, with fire rated discharge pipework directed to the collection, treatment and isolation tank installed at ground level
Conduit materials and signal cable seals to be appropriate for “Flammable Liquid” applications
Product Ref- Option 1
LH-ESK-40-FL-LA – Refer drawing – Pre-cast concrete tank installed at ground level with 300mm inlet and outlet stubs, oil separation medium, spill retention capacity, spill isolation valve, spill sensing probe and remote alarm signaling capability
Note
These projects require input and design assistance available from our engineering department
