Abstract: A gas cylinder for the storage of compressed gas includes a shut-off valve in engagement with a mouth of the cylinder; an external pressure sensor device for sensing pressure in the cylinder, the pressure sensor device being in continuous communication with the interior of the cylinder; a temperature sensor device for sensing temperature of the gas in the cylinder, the temperature sensor device being in thermal communication with the interior of the cylinder; a programmable computing device for calculating information from the temperature and pressure signals concerning the amount of contents in the cylinder; and a display screen operatively associated with the programmable computing device for displaying said information.

Abstract: A pressure vessel (1) is described comprising an inner fibre-wound pressure vessel (5), a jacket (3), a lid (17) and a wheel base (9). The wheel base (9) comprises a main body (11) having an open end for receiving the base of the jacket (3); a releasable catch (85) operable to attach the main body (11) of the wheel base (9) to a casing (3) mounted on the main body (11) of the wheel base (9) when the base (76) of jacket (3) is inserted into the open end of the wheel base (9); and wheels rotatably (13) attached to the main body (11) of the wheel base (9). When the jacket (3) is mounted to the wheel base (9), the casing (5) and the wheel base (9) are operable to be transferred between locations using the lid (17) and the wheels (13).

Abstract: A gas cylinder for the storage of compressed gas includes a shut-off valve in engagement with a mouth of the cylinder; an external pressure sensor device for sensing pressure in the cylinder, the pressure sensor device being in continuous communication with the interior of the cylinder; a temperature sensor device for sensing temperature of the gas in the cylinder, the temperature sensor device being in thermal communication with the interior of the cylinder; a programmable computing device for calculating information from the temperature and pressure signals concerning the amount of contents in the cylinder; and a display screen operatively associated with the programmable computing device for displaying said information.