Why Recover Petrol Vapour in Petrol Filling Stations

Why Recover Petrol Vapour in Petrol Filling Stations? l l 1 l Petrol contains volatile organic compounds (VOCs) that evaporate in fuel tanks When unloading petrol to underground storage tank and refueling vehicle, petrol vapour is released to atmosphere VOCs from petrol vapour will enhance the formation of ozone and fine particulates in the atmosphere, thus causing smog VOCs from petrol vapour contains benzene (a carcinogen), thus increasing potential health risk to the public Smell of VOCs can be a nuisance to people nearby

Vapour Recovery in Petrol Filling Stations l l l 2 In 1999, the Air Pollution Control (Petrol Filling Stations)(Vapour Recovery) Regulation was introduced Petrol filling stations were required to install a system to recover petrol vapour emitted during unloading of petrol into the underground storage tank (Phase I vapour recovery system) All stations now have Phase I vapour recovery system

Vapour Recovery During Unloading of Petrol (Phase I) Petrol Filling Station Petrol Tanker vapour petrol liquid petrol Phase I - 1999 (Unloading) 3 Underground Storage Tank

Vapour Recovery in Petrol Filling Stations l l 4 The Air Pollution Control (Petrol Filling Stations) (Vapour Recovery) Regulation was amended in 2004 to require petrol filling stations to install a system to recover petrol vapour emitted during vehicle refuelling (Phase II vapour recovery system) The amended Regulation has become effective on 31 March 2005

Vapour Recovery System for Petrol Refuelling (Phase II) P/V Vent Valve Petrol Dispenser Vehicle Fuel Tank Vacuum Pump Petrol Vapour Liquid Petrol Vapour Returned Liquid Petrol Underground Petrol Storage Tank 5 Petrol Liquid pump

Vapour Recovery at Petrol Filling Station Petrol Tanker Dispenser Vapour Vehicle Liquid Phase I - 1999 (Unloading) 6 Underground Storage Tank Phase II (Refuelling)

Installation Progress of Phase II Vapour Recovery System l l 7 All new stations have already installed Phase II vapour recovery system immediately after the Regulation has become effective from 31. 3. 05 Existing stations have 3 -years to retrofit such system (starting from 31. 3. 05). By end of 2006, almost half of the stations will complete the retrofit.

Certificate at Stations will Phase II Vapour Recovery System If a station has installed a Phase II vapour recovery system which passes the required tests, it will have this certificate posted at the station. 8

Stations with Phase II Vapour Recovery System have different Nozzles Features only with Phase II Vapour Recovery nozzle: l l 9 Holes to suck back petrol vapour released to underground storage tank Vapour guard to prevent vapour release