Cathodic protection unit, for subsea flexible pipe, comprises anode located remotely from pipe terminations, with connections to reinforcing wires in pipe

摘要

The anode (14) is located in an intermediate zone (40) of the flexible pipe, remote from the ends. The connector joins the anode to the metal wire(s) in this zone. Preferred features: The layer of reinforcement connected to the anode is next to the external plastic sealing sheath. The flexible pipe has several reinforcing layers, where the anode is connected electrically to at least one metal wire in each layer. A transverse metal rod makes the connection. The anode is connected to a collar clamped around the flexible pipe. This includes the rod. Several bolts spaced regularly around the periphery of the pipe are used to make connection. Connection of each to the wires is completed by brazing, welding or electrically-conductive adhesion. Screwed tappings are included in the layer of reinforcement to accept the bolts. The reinforcing layers may be separated by layers of electrical insulation, in which case the connection between anode and the innermost layer is below the last insulating layer. Connection is made with each reinforcing layer passed through. An anode is mounted in the intermediate zone, fixed to a support collar. The connection between anode and reinforcement is made through a second connecting collar, close to the first.