When a transformer arrives with a scuffed edge, chipped paint or a suspect lifting-point repair, the EPC team has to decide whether the condition is cosmetic, a corrosion risk or a release hold point. Zisheng Electric recommends treating each affected area as a traceable repair rather than relying on a quick visual touch-up. The acceptance basis should come from the approved coating specification, manufacturer instructions and project inspection plan.<\/p>\n
This guide is for EPC quality engineers and site supervisors at the delivery-to-installation stage. It explains how to describe damage, agree a repair method and record evidence without implying that a generic thickness value or visual opinion overrides the project documents.<\/p>\n
Before repair, identify the component, coating system, color or finish code where specified, and the location of each defect. Transformer tanks, radiators, conservator supports, marshalling cabinets and structural steel may use different systems. A repair product that looks similar can still have different chemistry, cure behavior or environmental limits.<\/p>\n
Record the delivery condition before cleaning or sanding. Use a marked-up equipment outline or photo log with a unique defect number, component reference, approximate dimensions, date, weather conditions and responsible inspector. Distinguish scratches through the topcoat from exposed primer or bare substrate. Note corrosion, impact deformation, oil contamination, water ingress, blistering, peeling, sharp edges and coating damage around bolts or lifting lugs. Photographs should show both a close view and enough context to locate the defect.<\/p>\n
For a transport-related inspection, coordinate the repair log with the transformer transport damage inspection workflow<\/a>. If equipment is waiting for a repair window, keep the environmental controls and preservation checks in the site storage plan<\/a> active; a coating repair does not replace storage protection.<\/p>\n The repair instruction should identify the accepted coating manufacturer and product, compatibility with the existing system, surface preparation method, feathering or edge treatment, number of coats, target film build and curing conditions. It should also state whether the work is allowed at site or requires manufacturer review. Do not assume that any one-part touch-up paint is acceptable for every transformer surface.<\/p>\n Surface preparation is often the controlling step. The repair area may need to be dry, free of oil, salts, dust and loose coating, and prepared to the specified standard. The method should protect nearby gaskets, nameplates, terminals, bushings, seals, machined surfaces and electrical connections. Abrasive blasting near assembled equipment may be inappropriate without a specific containment and protection plan. A small hand-prepared repair can be suitable when approved, but the method and limitations must be stated rather than improvised.<\/p>\nDefine the repair method before surface preparation<\/h2>\n