The U-shaped ring of the inner side shell plate of the boiler, opposite the burner, was found to have 5 penetrating cracks, and the cracks were chiseled out with V groove and then covered by welding.

• 立式燃油辅锅炉炉胆下部弯边处在燃烧器对面发现穿透性裂纹五条，此次挖V型槽后用电焊焊妥。