Patent ID: 7665639

Claim:
A tank truck for delivering a liquefied gas from a truck tank into a bulk storage tank via a filling hose and for recovering a gas-phase gas via a recovery hose, comprising: the truck tank; a gas recovery container; a gas compressor; a filling hose having a first coupling at a first end portion of the filling hose; and a recovery hose having a second coupling at a first end portion of the recovery hose, wherein the tank truck is configured such that the first end portion of the filling hose is connected to the recovery hose with a shorting hose, and a closable safety stop valve is interposed between the first end portion of the filling hose and a remainder of the filling hose and wherein the tank truck is configured to utilize the gas compressor to provide a negative pressure in the gas recovery container so that gas-phase gas in the recovery hose and liquefied gas in the first end portion of the filling hose are recovered into the gas recovery container via the recovery hose, such that the negative pressure in the gas recovery container and the closing of the safety stop valve causes gas-phase gas in the recovery hose and liquefied gas in the first end portion of the filling hose to be recovered into the gas recovery container via the recovery hose to thereby essentially prevent leakage of gases from any of the first coupling and the second coupling.