Urban underground network renewal with PU pre-insulated steel pipe; the old-to-new changeover was made without stopping the heat supply.
The renewal of the underground network in Hangjinqi town had to be carried out while the existing network stayed in service, so work was organised section by section.
PU prefabricated directly-buried insulated pipe was supplied with matching end seals and joint closures, allowing the old-to-new changeover to proceed section by section without interrupting the heat supply.
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