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RE: dancoker

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Steam air decoking will clean the tubes better than spalling or pigging but steam air decoking is much more difficult and takes more time.  Furthermore, some sites have environmental issues with steam air decoking.  Lastly if you have significant solids in the feed , you must pig.  The solid fall ot in the upper radiant section or lower convection section of the heater.  Spalling and steam air decoking are not effective method with high solid feeds. Normally, I recommend spalling on a regular basis with periodic pigging and pigging on an opportunity basis. 
Sim Romero

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