Patent ID: 6861119

Claim:
A vessel wall comprising: a laterally pressure-loaded reinforced rigid plastic panel; said panel being delimited by stiffeners of said wall; wherein said panel has a longer side and a shorter side, wherein said longer side is at least 1.5 times a length of said shorter side, and said rigid panel having a plurality of reinforcing laminated layers bonded together of substantially unidirectional substantially parallel fibers having a predominant orientation that form an angle with said sides of said panel; said angle between said predominant orientation and the longer side of said panel being between about 55° to 75° so that approximately one-half of said reinforcing laminated layers of said panel form a positive angle between about 55° to 75°, and approximately one-half of said reinforcing layers forming a negative angle between about 55° to 75° with respect to said longer side of said panel, and wherein said panel is laterally loaded by fluid pressure.