| 摘要 |
1,139,889. Pipes. S. E. WOLFE. 7 March, 1966 [15 March, 1965], No. 9797/66. Heading F2P. [Also in Division F1] A pipe for transporting slurries is provided with an internal helical rib 10 or ribs and the pitch of the helix or the spacing of adjacent helices is not more than 16 cm. The rib is at an angle of 35 to 60 degrees relative to the longitudinal axis of the pipe and projects. inwardly at least 0À6 cm. for a pipe up to 15 cm. in diameter and at least 0À9 cm. to 1À2 cm. for a pipe of greater diameter. The pipe may be formed from a strip or strips of sheet metal, having a flange 12, wound about a mandrel. The rib can be formed by inserting a coiled helix into the pipe and expanding it to abut the pipe wall. The pipe and rib 10 may be an aluminium, polyurethane or polyvinyl chloride extrusion. |
