|
1. A center-port pressure vessel used in seawater desalination or water purification by reverse osmosis, the pressure vessel comprising a tube body made of a fiber-reinforced resin, wherein the pressure vessel is characterized in that: a center inlet/outlet part that lets a liquid in or out is provided at an axial center of the tube body on a peripheral surface of the tube body; end-part inlet/outlet parts that let a fluid in or out are provided at axial ends of the tube body; the tube body is configured from a helical layer of which fibers are inclined at an angle of from ±40° to less than ±50° relative to a tube-body-axial direction, a reinforcing layer of which fibers are inclined at a greater angle than the helical layer relative to the tube-body-axial direction, and a seal layer constituting an innermost layer; a breakaway part that breaks away circumferentially outward from the seal layer is provided to a position on the helical layer where the center inlet/outlet part is provided; the reinforcing layer is configured from an inward reinforcing layer and an outward reinforcing layer provided respectively to inward and outward sides of the helical layer so as to enclose the breakaway part of the helical layer therebetween; and the center inlet/outlet part is provided so as to penetrate the inward reinforcing layer, the breakaway part of the helical layer, and the outward reinforcing layer.
|
