| 摘要 |
A length of non-irradiated polythene pipe 12 is heated and stretched and then inserted in an iron or other pipe which is to be lined, leaving 15% exposed. A radiant heater 37, 39, mounted on a sledge 35 is then pulled through the liner 12 to cause it to expand. The heater is sealed by travelling seals 5O, 54 and air is circulated by a blower 43 and perforated pipe 46. |
