GB1312612A - Telescopic pipe joints - Google Patents

Abstract

1312612 Pipe couplings BRITISH STEEL CORP 27 May 1970 [12 May 1969] 24144/69 Heading F2G A pipe section, particularly for use in large diameter (over 600 mm.) underground pipe lines has a socket 2 of a design such that the stresses created by the surrounding earth upon the pipe-line is substantially uniform in both the socket 2 and the remainder of the pipe section. The pipe section is of a "flexible" material, i.e. one whose breaking stress is substantially higher than its yield stress, for example steel, ductile iron and aluminium. This even distribution of stress is achieved by a socket whose wall thickness in a radial direction is between 1 and 1À5 times as great as the radial wall thickness of the remainder of the pipe section 3. This provision excludes an inturned flange 6 at the mouth of the socket 2 which prevents a gasket 4 from being blown out of the joint between adjacent pipe sections by the pressure of fluid within the pipe-line. An annular rib 5 may be provided to engage with the gasket. For coupling such pipe sections 3, the opposite end 1 to the socket 2 of each section 3 requires no spigot fitting, and as shown the end 1 may be simply inserted into the socket 2 of an adjacent pipe section 3.