Methods of joining or repairing lined pipes and associated apparatus
AssigneePioneer Lining Technology Limited
InventorStephen Barnes
Life of this patent
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Abstract
A method of creating a weld between a liner of a section of lined pipe and an electrofusion fitting. The fitting comprises at least one heating element, which is suitably disposed on or in an outer surface of the electrofusion fitting and is electrically isolated from an inner surface of the fitting. The method comprises locating an end of the electrofusion fitting within an end of the section of lined pipe, locating an induction coil within a bore of the electrofusion fitting in the vicinity of the at least one heating element, and supplying electrical power to the induction coil to energise the at least one heating element by electromagnetic induction.
Claims26
A method of creating a weld between a liner within a metal host pipe of a section of lined pipe and an electrofusion fitting, the method comprising selecting an electrofusion fitting having at least one heating element that is electrically isolated from an inner surface of the fitting, locating an end of the electrofusion fitting within an end of the section of lined pipe, locating an induction coil within a bore of the electrofusion fitting in the vicinity of the at least one heating element, supplying electrical power to the induction coil to energise that at least one heating element by electromagnetic induction, and monitoring a temperature of at least a portion of the electrofusion fitting;
- wherein the at least one heating element is positioned at a location corresponding to maximum depth of penetration of a magnetic field induced by a current in the induction coil.
Dependencies are inferred from the claim text.