System and method for off-loading liquids from tank trailers

A hydraulic system for off-loading liquids from tank trailers, comprising:

• a housing having a frame;
• a liquid pump secured on the frame and disposed at least partially within the housing, the liquid pump having a hydraulic motor in fluid communication with a hydraulic pump for operating the liquid pump;
• a compressor secured on the frame and disposed at least partially within the housing, the compressor having a hydraulic motor in fluid communication with the hydraulic pump for operating the compressor;
• and
• a hydraulic oil cooler in fluid communication with the hydraulic pump, the hydraulic motor of the liquid pump and the hydraulic motor of the compressor.

A method for off-loading a liquid from a tank trailer into a storage container, the method comprising:

• providing a hydraulic system comprising a housing with a liquid pump having a hydraulic motor and a hydraulic oil cooler disposed within the housing, the hydraulic motor of the liquid pump being in fluid communication with an external hydraulic pump and in fluid communication with the hydraulic oil cooler;
• providing a first liquid conduit connected between the tank trailer and the liquid pump;
• providing a second liquid conduit connected between the liquid pump and the storage container;
• and
• operating the liquid pump to draw the liquid from the tank trailer via the first liquid conduit through the liquid pump and to pump the liquid via the second liquid conduit into the storage container.

A method for off-loading a liquid from a tank trailer into a storage container, the method comprising:

• providing a hydraulic system comprising a housing with a compressor having a hydraulic motor and a hydraulic oil cooler disposed within the housing, the hydraulic motor of the compressor being in fluid communication with an external hydraulic pump and in fluid communication with the hydraulic oil cooler;
• providing a pneumatic line connected between the compressor and the tank trailer;
• providing a liquid conduit connected between the tank trailer and the storage container;
• and
• operating the compressor to pressurize the tank trailer via the pneumatic line and to force the liquid from the tank trailer via the liquid conduit into the storage container.