A protective jacket for a pressure vessel

A pressure vessel, comprising: a) a hybrid tank (14), including: i) a tank liner (38); and ii) an outer reinforcing layer (42) disposed on the tank liner, the outer reinforcing layer defining at least a portion of the outer surface of the hybrid tank; and b) a protective dust jacket (12) including: i) an upper support edge (46) with a first opening therein; and ii) a lower support edge (50) having a second opening therethrough; wherein the protective jacket (12) is adapted to surround and join the hybrid tank, and wherein the protective jacket (12) further includes iii) a substantially cylindrical wall (54) connecting the upper supporting edge with the edge lower support; The wall defines an inner surface disposed radially outward from the outer surface of the hybrid tank, characterized in that the substantially cylindrical wall is circumferentially closed and free of openings and that the inner surface of the wall and the outer surface of the hybrid tank cooperate to defining a substantially annular flow channel (58) in fluid communication with the first and second openings, wherein the openings and flow channel are adapted to allow convective flow to pass through to facilitate heat transfer between the hybrid tank and an environment in which the pressure vessel is located.