We performed API 579-1/ASME FFS-1 Fitness For Service on Overheated Boiler Tubes. The boiler tubes in Hatfield’s Ferry plant were exposed to overheating, which resulted from faulty tube connections, restricting the cooling circulation to near zero in the second pass. This resulted in temporary overheating of the SA 213-T2 tubes prior to the installation of jumper tubes.
Tubes under internal pressure operating at elevated temperature for extended periods of time can eventually split longitudinally due to creep tensile instability. Three of the boiler tubes experienced such failures. The remaining tubes which did not fail were of course subjected to creep rupture damage during the pressurized period at elevated temperature. Fitness For Service was evaluated concerning the damage and its effect on suitability for continued operation.
– Fitness For Service
– (PDF) “Weld Defects and Failures: Quantifying Fitness For Service – How Finite Element Mathematical Simulations can Mitigate Risk, Cut Costs and Improve Overall Safety”
– Publications – Heat Exchangers, Pressure Vessels, Welds and Other Applications, Fatigue, Elevated Temperature