Maine Propane Tank Setter Practice Test

Opening the hose end valve to allow LP-Gas to flow into the container is what makes the transfer hose swirl. Once gas is moving, its momentum and the turbulent interaction as it enters the receiving space cause the hose to twist or swirl. If the hose end valve is kept closed, there’s no flow, so no swirl occurs. An obstructed transfer line would stop or severely limit flow and wouldn’t produce the normal swirling pattern, and having the vent line open changes venting behavior rather than the flow-driven swirl in the hose.