Abstract: A composite-material pressure vessel (1) has a wall (4) with a reinforcing layer (11) containing one or more reinforcing fibers, wherein the reinforcing layer is an electrical conductor, wherein the wall (4) forms an electrical capacitor (13) having a first plate formed of the reinforcing layer (11), a second plate formed of an electrically conductive layer (15) overlapping the dielectric layer (11), a dielectric layer (14) interposed between the reinforcing layer (11) and the electrically conductive layer (15), as well as electrical terminals (19, 20) connected to the first and the second plates. The vessel control method and system perform electrical tests on the capacitor to derive information about the wall (4) structural condition.

Abstract: Pressure vessel (1) with a gas-impermeable liner (2) and a reinforcing layer (4) in composite material formed externally around the impermeable liner (2), as well as at least one boss (5) coupled to the impermeable liner (2) and to the reinforcing layer (4), wherein between the impermeable liner (2) and the boss (5) a polymeric sealing mass (7) is arranged bound to both the impermeable liner (2) and to the boss (5) by means of in situ cross-linking of the sealing mass (7).

Abstract: A gas cylinder (1) comprising a cylinder body (2), a supporting part (11) with one or more resting portions (12) protruding towards a lower side (7) of the cylinder (1), a protection ring (13) manufactured separately and then mounted to the supporting part (11) and having an annular slot (14) which accommodates said one or more resting portions (12) and a resting surface (15) facing the lower side (7) and free from metal edges.

Abstract: A method for making a gas-tight container (1) in elastomeric material comprises: providing two or more separate elastomeric portions (2, 3), cleaning and/or roughening the gluing surfaces (6) of the gluing edges (5), applying an adhesive (7) onto the previously cleaned, degreased and/or roughened gluing surfaces (6), assembling the portions (2, 3) to form the container (1) and inserting between the gluing surfaces (6) a raw elastomeric tape (8) not yet cured, applying a cold pressure on the overlapped gluing edges (5), heating the overlapped gluing edges (5) to thermally activate the curing of the raw tape (8), cooling the gluing areas.

Abstract: Pressure vessel (1) with a gas-impermeable liner (2) and a reinforcing layer (4) in composite material formed externally around the impermeable liner (2), as well as at least one boss (5) coupled to the impermeable liner (2) and to the reinforcing layer (4), wherein between the impermeable liner (2) and the boss (5) a polymeric sealing mass (7) is arranged bound to both the impermeable liner (2) and to the boss (5) by means of in situ cross-linking of the sealing mass (7).

Abstract: A composite-material pressure vessel (1) has a wall (4) with a reinforcing layer (11) containing one or more reinforcing fibres, wherein the reinforcing layer is an electrical conductor, wherein the wall (4) forms an electrical capacitor (13) having a first plate formed of the reinforcing layer (11), a second plate formed of an electrically conductive layer (15) overlapping the dielectric layer (11), a dielectric layer (14) interposed between the reinforcing layer (11) and the electrically conductive layer (15), as well as electrical terminals (19, 20) connected to the first and the second plates. The vessel control method and system perform electrical tests on the capacitor to derive information about the wall (4) structural condition.

Abstract: A gas cylinder (1) formed of a cylinder body (2) with a tubular wall (5) having at least a first tubular portion (11) that is enlarged, and at least a second tubular portion (12) that is adjacent and narrowed relative to the first tubular portion (11).

Abstract: A gas cylinder (1) internally defining a gas storage space (2) able to be closed by a stop valve (3) comprises a rigid wall (4) made from composite material having a reinforcing layer (5) containing reinforcing fibres and an inner surface (6) and a flexible sealing wall (13) connected to the rigid wall (4) through a mouth (9) and suitable for adhering in pressing contact against the inner surface (6) of the rigid wall (4).

Abstract: Methods for generating tracing information for gas cylinders are provided comprising a metal cylinder body manufactured from an unrefined metal piece, wherein such a method comprises the steps of equipping the metal piece with an individual marking, identifying, during at least one transformation or control step of the piece, an identification code of the piece by reading the individual marking and associating one or more process parameters of the transformation step or control results with the identification code, and storing the process parameters and the association with the identification code in a database. Systems for generating tracing information for gas cylinders are also provided.