Electrically insulating pipe connection for the prevention of corrosion formation on the inner wall of pipes to be connected by means of butt welding process, from corrosion produced image end media containing pipelines

摘要

1384614 Pipe joints L BAGNULO 26 June 1972 [9 July 1971] 29808/72 Heading F2G To prevent the coating 5, 5SP1/SP of abutted metal pipes 1,11 from being damaged when they are welded together, sockets 3 are secured on the pipe ends so as to extend beyond them, a non- combustible ring 6 (Fig. 3), which may be in two parts, is placed between the pipe ends to protect them, and the adjoined ends of the sockets are butt-welded together at 7, either directly, Fig. 3, or indirectly through a connector pipe section 10, Fig: 5. Holes 9 are then used to fill the socket spaces with a cold polymerizing resin or other setting material, and the holes are closed off. When the ring 6 is made in two parts, these may be mounted one on the end of each of the pipes. To provide cathodic protection, the ring 6, Fig. 3, may be of a reactive metal, e.g. zinc, contained within a thin steel sleeve which so extends as to make electrical contact with the sockets 3. If the reactive ring is required to be of some length, e.g. as a sleeve 13, Fig. 5, it may instead be mounted within the connector pipe section 10 which has its ends butt-welded at 7, 7SP1/SP to the adjacent ends of the sockets 3, 3SP1/SP. The sleeve 13 may be of platinum coated titanium fed by D.C. from an external source, to act as an anode: it is in this form insulated from the pipe section 10, &c.