GENERAL DAILY BOILER MAINTENANCE REQUIREMENTS

DESCRIPTION

COMMENT

Check temperature of exhaust gases at two different firings.

Compare temperatures with tests performed after annual cleaning.

Check Steam Pressure or Water Pressure/Temperature

Is Variation in steam pressure or water pressure/temperature under different loads? Wet steam may be produced if the pressure drops too fast (caused by excessive loading on the boiler).

Check for Unstable Water Level

Common causes of unstable water level are:

  1. Contaminates in boiler such as oil, excessive solids, excessive feedwater treatment, etc.
  2. Overload on boiler
  3. Malfunctions in equipment such as feedwater pump, water level control, etc.

Check Burner

  1. Are controls functioning properly?
  2. Is Burner clean? The burner may need cleaning several times daily if no. 6 fuel is used.

Check Motors and Auxiliary Equipment

Check to see that motors and auxiliary equipment are functioning properly.

Check Air Temperature In Boiler Room

The air temperature in the boiler room should not exceed or drop below recommended limits. These limits are determined by measuring the composition of the exhaust gases.

Check Blowdown

  1. Manual Blowdown -- The frequency and amount of blowdown will depend upon the amount and condition of the feedwater. Check to see that the blowdown valve does not leak.
  2. Automatic Blowdown -- Check operation of system and make sure that excessive blowdown does not occur.

Records

Keep daily records on:

  1. Type and amount of fuel used
  2. Exhaust gas temperature and position of firing
  3. Boiler room temperature at time (b) is measured

 

GENERAL WEEKLY BOILER MAINTENANCE REQUIREMENTS

DESCRIPTION

COMMENT

Check Exhaust Gas Composition and Temperature

  1. Measure exhaust gas composition and temperature at selected firing positions
  2. Recommended percentages of oxygen and carbon dioxide in exhaust gases are:
    3.

FUEL O2 (%) CO2 (%)

Natural Gas 1-1/2 10

No. 2 Fuel Oil 2 11-1/2

No. 6 Fuel Oil 2-1/2 12-1/2

Coal 3-1/2 13-1/2

These percentages may vary due to variations in composition of fuel.

Check Relief Valve

  1. Open valve manually while boiler is operating and observe steam pressure and force required (sometimes used).
  2. Check to see if relief valve leaks.

Check Water Level Control

Stop feedwater pump and allow control to stop fuel flow to burner. Do not allow water level in boiler to drop below the recommended low level.

Check Pilot and Burner Assemblies

  1. Clean Pilot and burner assemblies following recommended procedures.
  2. Check Assemblies:
    3.
  1. Spark gap
  2. Condition of electrode
  3. Condition of burner

Check Boiler Operating Characteristics

  1. Stop fuel flow to burner and observe flame failure (characteristics and timing)
  2. Start boiler and observe characteristics of flame

 

GENERAL MONTHLY BOILER MAINTENANCE REQUIREMENTS

DESCRIPTION

COMMENT

Check Exhaust Gas Composition and Temperature

  1. Measure exhaust gas composition and temperature at selected firing positions
  2. Recommended percentages of oxygen and carbon dioxide in exhaust gases are:
    3.

FUEL O2 (%) CO2 (%)

Natural Gas 1-1/2 10

No. 2 Fuel Oil 2 11-1/2

No. 6 Fuel Oil 2-1/2 12-1/2

Coal 3-1/2 13-1/2

These percentages may vary due to variations in composition of fuel.

Check Blowdown and Water Treatment Procedures

  1. Determine if blowdown procedure is adequate to prevent buildup of solids in boiler
  2. Determine if water treatment procedure is adequate to prevent undesirable effects

Exhaust Gases

  1. Measure exhaust gas composition and temperature over entire firing range
  2. Compare composition and temperature readings with those of previous months and reference data

Combustion Air Supply

  1. Check combustion air inlet to boiler room to be sure adequate openings exist
  2. Check combustion air inlet to boiler, and clean if fouled

Check Fuel System

Check pressure gauge, pumps, filters, and transfer lines. Clean filters as required.

Check Belts and Packing Glands

  1. Check belts for damage and proper tension
  2. Check packing glands for proper compression and leakage

Check for Air Leaks

  1. Around access openings
  2. Around flame scanner assembly

 

GENERAL ANNUAL BOILER MAINTENANCE REQUIREMENTS

DESCRIPTION

COMMENT

Check Exhaust Gas Composition and Temperature

  1. Measure exhaust gas composition and temperature at selected firing positions
  2. Recommended percentages of oxygen and carbon dioxide in exhaust gases are:
    3.

FUEL O2 (%) CO2 (%)

Natural Gas 1-1/2 10

No. 2 Fuel Oil 2 11-1/2

No. 6 Fuel Oil 2-1/2 12-1/2

Coal 3-1/2 13-1/2

These percentages may vary due to variations in composition of fuel.

Clean Waterside Surfaces

Follow manufacturer's recommended procedure in cleaning and preparing waterside surfaces

Clean Fireside

Follow manufacturer's recommended procedure in cleaning and preparing fireside surfaces

Repair Refractories on Fireside

Use recommended materials and procedure to repair refractory

Relief Valve

Remove and recondition or replace

Feedwater System

  1. Clean condensate receivers, and deaeration system
  2. Clean and recondition feedwater pumps

Fuel System

Clean and recondition system pumps, filters, burner, pilot, oil preheaters, oil storage tanks, etc.

Electrical Systems

  1. Clean all electrical terminals
  2. Check electronic controls and replace any defected parts
  3. Check mercury switches and replace if deterioration has occurred

Hydraulic and Pneumatic Valves

Check operation and repair any leaks

Start-up and Operation

Follow start-up and operation procedures

Exhaust Gases

  1. Make adjustments to give desired exhaust gas composition
  2. Record composition, firing position and temperature

Disclaimer:
Maintenance Schedules provided are generic and are provided for information purposes only. For specific Maintenance Schedules, please refer to the Installation, Operation and Maintenance Manuals provided with the equipment.


Conversion Factors - Download Excel file


© AB Young Co.