ME132.pdf - RETURN ME132 Warping of the Main Boiler Soot Blower Lance Tube Technical committee 1 Outline of breakdown During soot blowing of the main

ME132.pdf - RETURN ME132 Warping of the Main Boiler Soot...

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1 The Marine Engineer Mar.1990 ME132 Warping of the Main Boiler Soot Blower Lance Tube Technical committee 1. Outline of breakdown During soot blowing of the main boiler, the soot blower stopped during its reverse stroke and a long time alarm was sounded. Combination valve was manually operated immediately to carry out retraction but did not move. Having no choice but to retract it by manual handle, when the steam valve was shut and the clutch was detached, the lance tube was thrust into the furnace and incurred red heat bending damage. 1) When the air motor was opened for inspection, it was discovered that the shaft nut washer was fractured and the nut had loosened and had fallen off. Consequently, the rotor was contacting the cover and would not rotate. 2) The warping of the lance tube resulted because the absence of residual steam pressure was not
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