SET OF CONNECTING PARTS FOR WELDING THE PIPES OF STRUCTURED (CROSS-LINKED) POLYETHYLENE AND METHOD OF WELDING BY HEATED TOOL OF PIPES OF STRUCTURED (CROSS-LINKED) POLYETHYLENE

摘要

The invention relates to the branch of building and repair of the conduits of networks of cold and hot water supply and heating, transporting water, temperature of which is from 5 DEGREE C to 95 DEGREE C, and other liquid and gaseous media, to which the pipes of structured (cross-linked) polyethylene are chemically resistant. A set of connecting parts contains internal and external adapters made of pipes from structured (cross-linked) polyethylene. On treated annular end segments of internal adapter washers made of polyethylene unstructured pipes are installed. On treated internal surface of external adapter is installed the ring gasket made of polyethylene unstructured pipes, which is greater for one standard size than the polyethylene unstructured pipes, from which are made the washers. In the method of welding pipes from structured (cross-linked) polyethylene are used heating tools with internal cavities heated to the temperature from 260 to 280 DEGREE C, which are mounted on external adapter symmetrically with it. Then the heating tools are held on external adapter till obtaining of highly elastic state of the adapters and the parts of the pipes from structured (cross-linked) polyethylene to be welded. In this state of mentioned elements the ring gasket and washer made of polyethylene unstructured pipes pass into plastic state and their fusions are mixed up between them, and interact with the adapters and the parts of pipes from structured (cross-linked) polyethylene, which are welded. After this, heating tools are removed and the bandage is installed. Then the bandage is held on external adapter, the time of holding of bandage exceeds for ten times the time of heating the complete set of linked adapters and sections of pipes from structured (cross-linked) polyethylene. Identical strength of performed welded connection and pipes from structured (cross-linked) polyethylene is ensured, including pipes, which are made by different manufacturing methods of their linking.