The present invention relates to a method for controlling a fuel tank arrangement (100) connected to a prime mover (101) for propulsion of a vehicle. More particularly, the fuel tank arrangement (100) comprises a first (102) and a second (104) fuel tank connected to the prime mover of the vehicle.

The present invention relates to a method for controlling a fuel tank arrangement (100) connected to a prime mover (101) for propulsion of a vehicle. More particularly, the fuel tank arrangement (100) comprises a first (102) and a second (104) fuel tank connected to the prime mover of the vehicle.

A mobile device for discharging a liquid-filled container is disclosed. The device has a closable compartment provided with a closable opening, and an unloading installation in the inner space of the device, coupleable with the container. The unloading installation is able to extract liquid from the container via top unloading and to move it outside of the device, and includes an absorption means for removing liquid vapors which is connectable with the container for the extraction of top liquid vapors. A method for discharging liquid containers, such as unloading benzyl chloride liquid with the mobile device, is described.

Aspects of a flow balanced frac tank farm are described herein. In one embodiment, the flow balanced frac tank farm includes at least one battery of frac tanks comprising a plurality of frac tank trailers, a header pipe arrangement, and at least one valve between one or more of the frac tank trailers and the header system. The header pipe arrangement may include a header supply pipe to supply water to individual ones of the plurality of frac tank trailers and a header discharge pipe to discharge water from individual ones of the plurality of frac tank trailers. The header pipe arrangement may be relied upon to help balance the flow of heated fluids among the frac tank trailers in frac tank farm.