Abstract A method for improving or increasing the strength of a multiplelayer shell type cylindrical pressure vessel, the shell of which, due to the inner pressure applied, tends to present a sine-curve like bending behavior, i.e., a series of continuous curvatures appearing alternately on the opposite sides in the shell, with respect to the neutral line of the bending curvatures. (The intersecting point of such a curvature of bending with said neutral line will be referred to as a bending-direction transition point hereinafter.) The method provides at least one of such transition points a circumferential weld extending throughout the wall thickness of the shell or provides a solid wall type shell section extending from the joint between the head plate and the shell to the first transition point or provides a solid wall type shell section between the two transition points, thereby increasing the bending rigidity or strength at such transition points for the cylindrical pressure vessel.
A method for increasing the strength of a multiple-layer shell type cylindrical pressure vessel having head plates, the shell of which, when inner pressure is applied to the vessel, tends to present a sine-curve like bending behavior with a transition point at the neutral axis at each curvature, the method comprising: constructing said shell of more than one section wherein at least one of said sections is constructed of more than one layer, providing a circumferential weld between one of said head plates and one of said sections, and providing a circumferential weld extending throughout the wall thickness of said shell at a position coinciding with a first of said transition points with respect to the bending direction as viewed from said circumferential weld between said one of said head plates and said one of said sections.
Claim 2
Independent Claim
137 words
A method for increasing the strength of a multiple-layer shell type cylindrical pressure vessel having head plates, the shell of which, when inner pressure is applied to the vessel, tends to present a sine-curve like bending behavior with a transition point at the neutral axis at each curvature, the method comprising: constructing said shell of more than one section wherein at least one of said sections is constructed of more than one layer, providing a circumferential weld between one of said head plates and one of said sections, and providing a circumferential weld extending throughout the wall thickness of said shell at a position coinciding with a first of said transition points with respect to the bending direction as viewed from said circumferential weld between said one of said head plates and said one of said sections.
Claim 3
Dependent Claim
34 words
A method as defined in claim 1, wherein at least one of said sections of said shell extending from said welding joint to one of said transition points is a solid wall type shell.
Claim 4
Dependent Claim
24 words
A method as defined in claim 1, wherein at least one section between two of said transition points is a solid wall type shell.