While the overall performance of the ESP is continuously monitored by devices such as voltage
meters and transmissometers, the components of the ESP and their operation are periodically
inspected by plant personnel as part of a preventive maintenance program. In this way,
problems are detected and corrected before they cause a major shutdown of the ESP. Of
course, good recordkeeping should be an integral part of any maintenance program.
The frequency of inspection of all ESP components should be established by a formal in-house
maintenance procedure. Vendors' recommendations for an inspection schedule should be followed.
A listing of typical periodic maintenance procedures for an ESP used to collect fly ash
is given in Table
In addition to the daily monitoring of meters and the periodic inspection of ESP components,
some operational checks should be performed every shift and the findings should be recorded
on a shift data sheet. At the end of every shift, these shift data sheets should be evaluated for
maintenance needs. These once-per-shift checkpoints include an inspection of rappers, dust
discharge systems, and T-R sets for proper functioning and an indication of which T-R sets are
in the "off" position. Rappers that are not functioning should be scheduled for maintenance,
particularly if large sections of rappers are out of service. Dust discharge systems should have
highest priority for repair; dust should not accumulate in the bottom of the ESP for long periods
of time because of the potential for causing severe plate misalignment problems. Hopper
heaters can usually be repaired with little difficulty after removing weather protection and
insulation. Insulator heaters may be difficult to repair except during short outages. Hopper
heaters keep condensation on the insulators to a minimum and help keep the dust warm and
free-flowing.
In addition to performing maintenance, keeping records of the actions taken is also important.
For example, wire replacement diagrams should be kept. Although an ESP can operate effectively
with up to 10% of its wires removed, care must be taken that no more than 5 to 10 wires
in any one gas lane are removed. The loss of wires down any one lane can result in a substantial
increase in emissions. The only way to adequately track where wires have failed or slipped
out of the ESP is with a wire replacement chart. Also, any adjustments to the rapper frequency
and intensity should be recorded along with any repairs. These same recordkeeping practices
should be followed for any repairs or replacements made on T-R sets, insulator/heaters, alignment,
and the dust discharge systems.
meters and transmissometers, the components of the ESP and their operation are periodically
inspected by plant personnel as part of a preventive maintenance program. In this way,
problems are detected and corrected before they cause a major shutdown of the ESP. Of
course, good recordkeeping should be an integral part of any maintenance program.
The frequency of inspection of all ESP components should be established by a formal in-house
maintenance procedure. Vendors' recommendations for an inspection schedule should be followed.
A listing of typical periodic maintenance procedures for an ESP used to collect fly ash
is given in Table
In addition to the daily monitoring of meters and the periodic inspection of ESP components,
some operational checks should be performed every shift and the findings should be recorded
on a shift data sheet. At the end of every shift, these shift data sheets should be evaluated for
maintenance needs. These once-per-shift checkpoints include an inspection of rappers, dust
discharge systems, and T-R sets for proper functioning and an indication of which T-R sets are
in the "off" position. Rappers that are not functioning should be scheduled for maintenance,
particularly if large sections of rappers are out of service. Dust discharge systems should have
highest priority for repair; dust should not accumulate in the bottom of the ESP for long periods
of time because of the potential for causing severe plate misalignment problems. Hopper
heaters can usually be repaired with little difficulty after removing weather protection and
insulation. Insulator heaters may be difficult to repair except during short outages. Hopper
heaters keep condensation on the insulators to a minimum and help keep the dust warm and
free-flowing.
In addition to performing maintenance, keeping records of the actions taken is also important.
For example, wire replacement diagrams should be kept. Although an ESP can operate effectively
with up to 10% of its wires removed, care must be taken that no more than 5 to 10 wires
in any one gas lane are removed. The loss of wires down any one lane can result in a substantial
increase in emissions. The only way to adequately track where wires have failed or slipped
out of the ESP is with a wire replacement chart. Also, any adjustments to the rapper frequency
and intensity should be recorded along with any repairs. These same recordkeeping practices
should be followed for any repairs or replacements made on T-R sets, insulator/heaters, alignment,
and the dust discharge systems.
Preventive maintenance checklist for a typical
fly ash precipitator
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