Pressure cylinder

Abstract

A pressure cylinder which is formed from two sections which are joined together to enclose a volume which is bounded by two spaced walls with a settable filler between the walls.

1 . A pressure cylinder which includes a body which is formed from at least two sections, each section including an integrally formed inner wall and an outer wall which is spaced from the inner wall, and wherein the two sections are interconnected so that the inner walls enclose a fluid-containing volume inside the body. 
   
   
       2 . A pressure cylinder according to  claim 1  wherein a settable material is located in a void between opposing surfaces of the inner and outer walls and is bonded to these surfaces. 
   
   
       3 . A pressure cylinder according to  claim 1  wherein, for each section, the inner wall has a substantially cylindrical portion which is tapered and an end piece at a first end of the cylindrical portion which is domed, and the outer wall is substantially cylindrical and is tapered. 
   
   
       4 . A pressure cylinder according to  claim 3  wherein the inner wall, at a second end which is remote from the first end, is attached to the outer wall by means of an annular component which acts as a bridge between the inner and outer walls and which lies in a plane which is substantially at a right angle to a longitudinal axis of the body. 
   
   
       5 . A pressure cylinder according to  claim 4  wherein the outer wall, on an external surface, is formed with a recess which extends circumferentially around the outer wall adjacent the annular component. 
   
   
       6 . A pressure cylinder according to  claim 3  wherein the end piece of the inner wall is formed with at least one inlet or outlet aperture. 
   
   
       7 . A pressure cylinder according to  claim 6  wherein the aperture is in the form of a spigot which projects from an outer surface of the end piece in a direction which is substantially parallel to a longitudinal axis of the body and which is threaded to enable a screw coupling to be made to it. 
   
   
       8 . A pressure cylinder according to  claim 5  wherein the two sections are substantially identical and are interconnected by joining the annular components to each other and wherein a reinforcing band, which is positioned in the recesses in the outer walls, extends around the body. 
   
   
       9 . A pressure cylinder according to  claim 1  wherein each section has formations which are integrally formed with at least one of the walls and which extend into the gap between the inner wall and the outer wall. 
   
   
       10 . A pressure cylinder according to  claim 1  which includes two end caps, and wherein each end cap is engaged with a respective end of the body and is secured to the body by means of formations which engage with complementary formations in the respective sections.