Robotic Fired Heater Convection Bank Cleaning in Trinidad

Studded tube before clean Before clean Before clean - concrete deposit Lower level tubes before clean Access to top of furnace Lower level tubes Studded tubes after clean Fired Heater studded tubes after clean Studded tubes after clean Studded tubes after clean Morning cleaning information

Summary

High pressure air lancing had proven to be ineffective at removing hard deposits residing in between studded and bare convection tubes within a fired heater. The refinery chose Tube Tech’s advanced robotic system as it guaranteed the removal of deposits to improve heat transfer, reduce stack temperatures and fuel consumption, and improve overall throughput.

The Challenge

  • The two convection tube banks, each with 40 studded tubes, were previously cleaned once per year with high pressure air.
  • Standard cleaning companies could not access the lower level tubes.
  • The client described the deposit on the 40ft long tubes as a very hard layer of mud approximately 1.5” (37mm) thick.
  • The deposit was compacted between the studs.
  • Both triangular and square tube banks required cleaning.
  • As part of a vacuum distillation unit turnaround, the convection tube banks had to be cleaned within a very short window.
  • The client requested a production standard clean (80%) even though Tube Tech offered an IRIS inspection cleaning standard (98%).

The Solution

  • Tube Tech met all the client’s health and safety requirements before mobilising.
  • The studs were longer than indicated by the client’s drawings. However, the “Remote Controlled Furnace Robot” was quickly re-calibrated to suit the new dimensions.
  • The deposit’s consistency was closer to cement than mud but the robot was adapted to clear deposits from between the studded rows within the convection cell.

Tube Tech Comment

Ken McMahon, Project Manager, said: “This was the first time our robot had been used on studded tubes as normally we encounter finned or bare tubes. The client’s drawings were very old where dimensions were inaccurate but our team adapted well and achieved a higher than expected standard of clean.”

For more information or to discuss your cleaning challenge call us on +44 1268 786999 or e-mail info@tubetech.com, alternatively fill out our contact form.