| 摘要 |
Contaminants are removed from the interior or a duct by the introduction within the duct of a tube having a coating of a curable, strippable resin using an everting/inverting membrane assembly. The coated tube is contained within the inverted membrane assembly and urged against the walls of the duct as the membrane is everted. The coated tube extends through an open end of the duct and is secured to the duct to retain the tube within the duct. The membrane is again inverted for the resin to cure and adhere contaminants to the tube. Another membrane assembly is then everted with the tube, the tube is secured to the membrane assembly, and withdrawn within the membrane as the membrane is inverted from within the duct. The contaminants are contained with the inverted membrane for analysis or disposal. In one embodiment, a towing membrane assembly is inserted through a second open end of the duct and attached to the tube-carrying membrane. The towing membrane assembly is inverted and the tube-carrying membrane is everted to assist the tube-carrying membrane to negotiate bends and junctions within the duct assembly.
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