Method and apparatus recuperating boil-off vapor

A method comprising drawing off fuel undesirably in gaseous form, and converting the fuel in gaseous form to a liquid form.

Apparatus which draws off fuel undesirably in gaseous form and converts the fuel in gaseous form to a liquid form.

A method of converting an organic substance in gaseous form to a liquid form, comprising compressing the organic substance in gaseous form.

An apparatus for converting an organic substance in gaseous form to a liquid form, comprising a compressor which serves to compress the substance in gaseous form.

A method of compressing gaseous matter, comprising opening a plurality of inlets, operating a compressor to draw the gaseous matter through the inlets to an inlet duct of said compressor and to expel said gaseous matter through an outlet of said compressor, closing at least one of said inlets, and operating said compressor to draw the gaseous matter through the open inlet(s) to said inlet duct, to expel the gaseous matter through said outlet and to return at least part of that expelled gaseous matter to upstream of said compressor.

Apparatus for compressing gaseous matter, comprising a compressor, an inlet duct of said compressor, an outlet of said compressor, a plurality of individually closable inlets part of that expelled gaseous matter to upstream of said compressor.

Apparatus for compressing gaseous matter, comprising a compressor, an inlet duct of said compressor, an outlet of said compressor, a plurality of individually closable inlets for the gaseous matter and leading to the inlet duct, a return duct by way of which said outlet communicates with said inlet duct, and a control device which controls communication between said outlet and said inlet duct via said return duct in dependence upon the number of said inlets which is open.

A method comprising sensing when a heavier fluid attains a predetermined height in a tank, removing at least part of said heavier fluid from said tank when said predetermined height is attained, sensing when a lighter fluid attains a predetermined height in said tank, and removing at least part of said lighter fluid from said tank when the latter predetermined height is attained.

Apparatus comprising a tank, a first sensor which serves to detect when a heavier fluid in said tank attains a predetermined height in said tank, a second sensor which serves to detect when a lighter fluid in said tank attains a predetermined height in said tank, a first device responsive to said first sensor and serving to cause removal of at least part of said heavier fluid from said tank when said heavier fluid attains the first-mentioned predetermined height, and a second device responsive to said second sensor and serving to cause removal of at least part of said lighter fluid from said tank when said lighter fluid attains the second-mentioned predetermined height.