Boiler Puff

This is a video of a Boiler Puff that occurred in a fire tube boiler.  After the boiler was shut down (approx 30 sec) the 15 second  post purge occurred as well as the atomizing line purge of the oil gun.  This atomizing purge can be seen as the white smoke coming from the gun.  When the post purge stops, the atomizing media is still flowing.  There is a residual flame on the refractory ring that ignites the puff at approximately 55 sec.