CALL US: (09) 573 0146  |   7 Gabador Place, Mount Wellington, Auckland, NZ
Electrical


The Process of Refurbishment

Disassembly

  • Radiators are drained on site and removed from their transformer before being transported to the Powerstrip plant in Auckland for processing.
  • Radiators are always inspected on receipt by Powerstrip so that suitable arrangements can be made for any additional damage or faults identified.

Pressure Testing

  • Pressure testing takes place immediately after the radiators have been inspected upon arrival at the Powerstrip plant.
  • Debate about the correct pressure to be used for testing means that we adjust it for each individual unit, depending on its condition.
  • The testing is performed with calibrated pressure equipment and dry air.
  • Any signs of weakness are noted by our staff and minor problems can be repaired by welds or the application of a stainless steel epoxy. More serious problems will be reported to the owner/contractor for further instruction.
  • Powerstrip Industries has used this method for a number of years, with a 100% success rate.


Radiators being disassembled from a substation transformer.


Stripping

  • Radiators are immersed in a stripping bath containing a purpose formulated and heated chemical mixture.
  • This effectively removes all paint, oil and dirt build up from the external surfaces without affecting galvanized substrates.
  • The stripping solution also contains a corrosion inhibitor.
  • Once removed from the bath, radiators are hot pressure blasted by water, removing any remaining traces of the old coating and stripping solution. 

 

The Need for Refurbishment

Corrosion

  • Radiators can and frequently do suffer from internal corrosion when moisture and acidity build up in the insulating oil, causing them to rust from the inside out.
  • External corrosion also occurs regularly, especially when the radiators are located in harsh environments, they are not galvanized or they have been coated initially with inadequate or inappropriate paint systems.


Erosion is evident on these radiators received for refurbishment


Examples of fin structure on transformers and radiators


Delamination

  • Painting protects radiators from deterioration.
  • However, their fin structure makes it impossible to abrade all surfaces to ensure proper paint adhesion.
  • As a result the new paint adheres by skin friction only and delamination is inevitable.
  • Re-painting is therefore needed at times during the working life of a radiator.
  • Incompatible paint systems may also result in delamination when:
      - new paint coatings are sprayed on site on top of the old coating.
      - galvanized surfaces are incorrectly prepared.
      - the coating system has been incorrectly specified or applied.


Design Faults

  • Design problems in fin and header tank construction can also lead to problems with radiators.
  • Welding may leave gaps between surfaces.
  • Crevices, if not properly sealed, allow moisture to enter and corrosion to commence.


Repairs to corroded radiator fins in progress



Contact Us

For a no obligation discussion on how we can assist you, please call one of our team!

7 Gabador Place, Mount Wellington, Auckland
          New Zealand

Phone: (09) 573-0146

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