Helicoidal Naphtha Evaporator Cleaned in Southeast Africa

Evaporator Fouling Remove and Cleaning Specialists Tube Tech Helicoidal Naptha Evaporator Cleaning Specialists Tube Tech Evaporator Cleaning Specialists Tube Tech Worldwide Evaporator Cleaning Specialists Tube Tech Morning cleaning information

Severe deposits removed using multi-step programme

60,000 tonnes of refined nickel and 5,600 tonnes of refined cobalt are processed at this African plant every year. A Vertical, Helicoid, Naphtha Evaporator containing a single 70 loop x 600m diameter steel coil, measuring 130m long and 38mm internal diameter had become blocked / fouled. Deposit thickness was expected to be no more than 2mm of very hard hydrocarbon coke which had increased back pressure dramatically from 1 bar to 7bar putting a critical strain on the process with the only option being a costly replacement!

Challenge:

  • To decoke the coil by removing the fouling so as not to damage the carbon steel tube which would cause a key way for future build up to form more quickly.
  • After arriving on site and opening the coil, the coke deposit was measured at 10 mm thick.

Solution:

  •  A bespoke range of Micro-darTT™ projectiles were developed to decoke this small diameter tube.
  • The coil was inspected using a Micro-camera Dart.

Tube Tech Comment

Scott Donson, Technical Sales Manager: “Despite adverse seasonal cyclones our team decoked this Naphtha Evaporator Coil back to bare metal using a unique range of projectiles within time allocated and on budget.

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