| 摘要 |
A spacer means (1) of thermoplastics material for keeping a tubular covering (16) in a spaced relation to a central feed pipe (14) comprises two first legs (2, 3) engaging a feed pipe (14), said first legs (2,3) being interconnected by a U-shaped connecting part (13). The free ends of the spacer form spacing parts (4, 5) and together with U-shaped connecting part (13) the tubular covering (16) of polyethylene can be kept in spaced relation to the feed pipe (14). The spacer means (1) may be provided with second legs (36, 37) for engaging a return pipe (35). A composite pipe comprises a tubular covering (16) held at distance from a central feed pipe (14) by means of a spacer means 1, the space between covering (16) and feed pipe (14) being filled with a plastics foam (15). |
