When unloading hose and its connectors are taken off after completion of unloading of LPG into a bulk storage tank in a conventional bobtail, propane trapped in them is inevitably discharged into the atmosphere.
Although there was no legislation or regulation on the LPG discharged from a bobtail at that time, we, at KOA GAS NIHON CO., LTD (KGN) started the technical development about six years ago in terms of the compliance of the company's creed that the pollution problem and safety should precede all others in our company operations.
The first bobtail carrying a newly developed recovery unit for propane trapped in unloading hose and its connectors was deployed in our fleet of bobtails in 2002.

(Refer to photo of overall view)

Overall view