1. For any discontinuity one inch (25mm) in length or less, no plate repair is required, and need not be investigated.
2. For any discontinuity over one inch (25mm) and 1/8”(3mm) maximum depth, no plate repair is required, but the depth should be investigated.
3. For any discontinuity over one inch (25mm) in length with depth over 1/8”(3mm) but not greater than ¼”(6mm), removal is required, but welding is not necessary.
4. For any discontinuity over one inch (25mm) in length with depth over ¼”(6mm), but not greater than 1 inch (25mm), completely remove and weld area required. Aggregate length of the welding shall not exceed 20% of the length of the plate edge being repaired. ASTM A6 section 10.5 stipulates requirements for repair by welding.