On-stream inspection is also important to
identify problems which can not be seen while the equipment is out-of-service.
A discussion with operations and maintenance personnel is highly recommended to
identify problem areas. At this time, a review of the operating conditions may
also help to indicate problems, such as: O2 percentage, (inability to maintain
target O2 could indicate leaks or burner problems), draft (unsteady/pulsating
draft can damage heater/boiler components), drum levels, pressures and
temperatures.
An infrared scan of the casing can allow a hot
spot map to be created so that these areas can be investigated during the
maintenance outage. Flame locations and appearance can help identify problems
with burner tiles, refractory, and floors. Flames emanating from a portion of
floor or wall indicate a problem that needs follow-up inspection. Complete an
external inspection to determine condition of the structure, such as buckstays,
to look for signs of expansion/buckling. Also, inspect external equipment such
as blowdown valves, soot blowers, level gauges, external hangers/rods,
insulation, etc. for damage that would need to be addressed at the outage.
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