Pressurized fluid tank and method and apparatus for producing one such tank
View Patent ↗A tank ( 1 ) for storing fluid under high pressure, of cylindrical overall shape and round cross section comprising at each of its ends along its axis ( 2 ), a metal end piece ( 3, 4 ), a liner ( 6 ) enveloping the said end pieces, and a structural layer ( 7 ) of fiber impregnated with thermosetting resin enveloping the said liner.
1. A method of manufacturing a tank of cylindrical overall shape of round cross section for the storage of high-pressure fluid, the tank comprising, about an axis, a liner and a structural layer, the method comprising steps successively involving:
placing metal end pieces inside a tube intended to form the liner;
shaping the ends of the tube to the exterior shape of the end pieces by locally reducing the diameter of the tube to form a preform; and
winding at least one tape of fibre impregnated with thermosetting resin around the liner to form the structural layer of the tank.
2. The method according to claim 1 , further comprising placing elastomer seals in annular grooves of the radially exterior surface of the end pieces facing the tube intended to form the liner.
3. The method according to claim 1 , further comprising placing hooping around the ends of the tube which are formed over the end pieces.
4. The method according to claim 1 , further comprising winding a second tape of fibre impregnated with thermosetting resin around the structural layer to form a protective outer layer of the tank.
5. The method according to claim 4 , wherein the second tape of fibres is married up with the first tape of fibres.
6. The method according to claim 1 , wherein an internal pressure is maintained in the volume of the preform consisting of the liner and of the end pieces while the tape is being wound.
7. The method according to claim 1 , wherein axial traction is maintained on the preform consisting of the liner and of the end pieces while the tape is being wound.
8. The method according to claim 1 , wherein two tapes are simultaneously wound substantially symmetrically with respect to the axis of the preform consisting of the liner and of the end pieces.
9. The method according to claim 1 , wherein, in order to preform the winding, the preform consisting of the liner and of the end pieces is rotated about its axis, the preform being held by the end pieces, the at least one tape being guided by a mobile means able to move parallel to the axis of the preform.
10. The method according to claim 9 , wherein the axis of the preform is kept substantially horizontal during winding.