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(11)    Patent No :    AP 2669    (73) Applicant(s)       
(21)    Application No :    AP/P/2009/005092    COMPRESSED ENERGY TECHNOLOGY AS, C/O Höegh LNG       
            AS., P O Boks 4, Skøyen, 0212 Oslo,       
                   
(22)    Filing Date :    13.06.2008    Norway       
(24)    Date of Grant &    20.05.2013           
                   
(45)    Publication :

(30)    Priority Data                (72) Inventors   
    (33) Country    (31) Number    (32) Date        AXELSSON Gunnar, Norway   
    NO    20073034    14.06.2007        JENKINS Peter, Norway   
                       
                    LOTVEIT Svein Are, Norway   
                    et al       
                    (74) Representative   
(84)    Designated State               
                       
    GH   MZ   T Z                GALLOWAY & COMPANY   
                    ZIMBABWE       
                       
(51)    International    Classification    F17C 1/06    (2006.01)    F17C 13/06  (2006.01)   
            F17C 1/16 (2006.01)   
(54)    Title

End boss and composite pressure vessel

(57)    Abstract

End boss (2,9) arranged in an opening of a composite pressure vessel comprising an inner fluid tight liner (3) and an , outer reinforced polymer layer (1), which end boss comprises a short pipe section (2) and a lid (9), the lid is arranged at an upper end of the pipe section (2) that extends outwards

from the vessel, the pipe section (2) is arranged through the opening of the vessel and extends to a lower end where an outwardly extending flange on the pipe section is arranged between the outer reinforced polymer layer (1) and the inner liner (3) in the vessel, distinguished in that the inner liner (3) extends upwards through the opening of the pipe section to said lid, on the inside of the inner liner, in a distance nearest to the Hd, a sealing surface is arranged, the sealing surface

lies against the inner liner and has at least one gas tight seal interfacing against the inner liner as the sealing surface is integrated with the lid or is a sleeve or a pipe section which is sealingly fastened to the lid, and on the outside of the inner liner, in a groove nearest to the lid and pipe section, around the upper end of the pipe section, a pre-tensioning device is arranged (4,8,10,16), which regardless of the pressure in the vessel presses the inner liner (3) against said sealing surface and the at least one gas tight seal (6).

(56)    Documents Cited :    WO 2007085276    US 5287988    WO 2005093313

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