Petrol storage tank has air breather hole to in-tank air bladder, preventing escape of noxious fumes during road tanker fuel deliveries

摘要

A petrol station sub-soil petrol (32) storage tank has an inlet (12), an outlet (14) and a breather opening (16) which admits air (34) as the tank is progressively emptied. The air is admitted to a flexible air bag the neck of which is joined to the air inlet.