On-site LFET Inspection and Condition Assessment for Boiler Furnace Hopper Tubes at a Asian Power Plant

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ETD was approached to submit a proposal on condition and damage assessment of furnace hopper tubes of a boiler by performing on-site LFET (Low Frequency Electromagnetic Technique) inspection, analysis and assessment of the tubes.

The objectives and scope of the work to be carried out were:

1.  Review the drawings of furnace hopper tubes of the boiler to be studied and identify accessible test locations for on-site LFET inspection;

2.  Perform on-site LFET (Low Frequency Electromagnetic Technique) inspection of furnace hopper tubes for the quantity;

3. Analysis the on-site LFET inspection data:

  • To detect internal tube thinning/gouging due to the hydrogen damage. 
  • To determine the internal wall thinning. 
  • To determine the active and dominant damage mechanism and level of degradation.

4. Review & analysis previous failures, inspection and maintenance data for the furnace hopper tubes;

5. Perform assessment of hydrogen damage and/or other damage(s) and current condition of furnace hopper tubes based on the findings of all above investigations.

6. Prepare a full report including results of on-site inspections, analysis results of damage & condition assessment study and make recommendations for any further actions to be taken for safe and reliable operation of the boiler.

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