Patent ID: 6010669
Filing Date: 2000-01-04
Classification: B01J,B23K,B23P,C07C,Y02P

Abstract:
Method for repairing and functionally restoring high or medium pressure equipment of an industrial plant, being entirely accomplished through a pre-existing man-hole of the equipment as the only access, comprising the steps of:(a) cleaning a corroded area of an anticorrosive metallic lining of high or medium pressure equipment of an industrial plant, thereby forming a cleaned area;(b) forming supporting surfaces on an inner surface of the cleaned area, said supporting surfaces configured for receiving and being welded to edges of liner elements;(c) positioning liner elements on the supporting surfaces and on non-corroded portions of the inner surface of the anticorrosive lining adjacent to the cleaned area so that the cleaned area is completely covered with liner elements, wherein the liner elements and supporting surfaces are positioned so as to define a first interstitial space between the cleaned area and a liner element which does not directly communicate with a weep-hole and a second interstitial space adjacent to the first interstitial space, wherein the second interstitial space directly communicates with a weep-hole;(d) positioning at least one strap so as to overlap adjacent edges of the liner elements which define the first and second interstitial spaces;(e) welding adjacent edges of the liner elements positioned as in step (c), welding the edges of the liner elements onto the supporting surfaces and welding said at least one strap to the liner elements, thereby forming an internal surface of the lining which is totally sealed with a non-corroded area of the lining; and(f) leaving an interrupted stretch of weld beneath the strap positioned as in step (d), so as to allow communication between the first and second interstitial spaces, said step of leaving interrupted stretches further comprises leaving an average number of from 1.5 to 2.5 interrupted stretches having a length of between 5 and 30 mm for each liner element.