Patent ID: 7032769

Claim:
A pressure vessel, comprising: an inner shell capable of serving as a gas barrier and a pressure resistant outer shell provided to cover the inner shell, which said outer shell is made of a carbon fiber reinforced plastic (CFRP) comprising reinforcing fibers and a resin and of 35 GPa or more in tensile modulus and 1.5% or more in tensile breaking strain, wherein the outer shell comprises a layer of reinforcing fibers arranged, with reference to the axial direction of the pressure vessel, at an angle within a range from ±0° to ±15°, a layer of reinforcing fibers arranged at an angle within a range from ±75° to ±105° and a layer of reinforcing fibers arranged at an angle within a range from ±30° to ±60°, and in those layers, the volume ratio of reinforcing fibers is in the range of 1:1.5–2.5:0.2–1.2, respectively.