D-Patch Repairs are an extremely common repair on industrial package boilers and required when defects in the shell, access tube or furnace of the boiler are identified. NDT testing is carried out every five years, a process which looks for defects within the structure of the boiler. If defects are discovered, a D-Patch repair is often necessary.
Our engineers have carried out numerous D-patch repairs on various types of steam boilers. We provide the full documentation required for certification, including:
- Welders Qualifications
- Material Certification
- Method Statements
- Risk Assessments
What is a D-Patch Boiler Repair?
The name D-patch refers to the shape of the patch that is used to repair a defect in the shell, access tube or furnace of the boiler. The corners of the patch are cut to a radius to reduce stress points in the plate patch after welding. Once a defection is identified in an industrial boiler, a specification is produced for the patching and materials. The fatigued section of the shell is then cut out and the precision-made patch welded in place. Pressure and steam testing ensures the integrity of the newly fitted patch.