MAINTENACE OF OIL & GAS FIRED BOILERS

 

PERODICAL MAINTENACE SCHEDULE OF OIL & GAS FIRED BOILERS

 

 

DAILY:

 

§  Ensure that feed water meets the requirement stipulated by boiler manufacturer.

§  Give blow down at regular intervals depending on the water analysis.

§  Blow down the level controller water column and gauge glass. Clean the gauge glass externally.

§  Drain the soft water service /deaerator tank slightly to remove any sediments that might have settled down.

§  Clean the fuel filters and strainers.

§  Drain slightly the oil service tank to remove any water and sediments that might have settled down.

§  Cleaning of burner is not necessary every day, however, if it becomes necessary great care must be exercised not to disturb the electrode setting. Nozzle should be removed, using proper tools cleaned and refitted.

§  Carry out soot blowing of Economizer if available.

§  Drain the water service tank for some time to remove sediments if any.

 

WEEKLY:

 

§  Ensure that the water level is properly controlled.  Check the working of low level & extra low-level alarm by reducing the water level. As the level goes down, the low-level alarm comes on tripping the burner.  As the level goes further down the second low level alarm (extra low) gets activated.  This also trips the burner.

§  Ensure proper lubrication of all moving parts.

§  Clean the flame sensor and viewing glasses.

§  Check the condition of door seals.

§  Check that there are no variations in the fuel pressure as compared with that at commissioning time.

 

MONTHLY:

 

§  Clean electrical contacts of all relays and tighten connections if any.

§  Check water pump gaskets and non-return valve.

§  Lubricate the modulation motor linkages.

§  Clean the burner nozzle and ignition electrodes.

§  Check and clean, if necessary, the furnace.

 

 

QUARTERLY:

 

§  Clean blower fan blades.

§  Drain and clean water service/deaerator tank and fill it with soft/DM water.

§  Clean the fuel filters/strainers.

§  Drain and clean fuel service tank.

§  Open the clean outdoors of boiler, superheater, and economizer. Remove collected soot deposits.

 

HALF YEARLY:

 

§  Check all valves for leakage; lap them if found leaking.

§  Lubricate bearings of water pumps.

§  Clean the burner gas spuds.

§  Check the sealing of Manhole head holes, and clean outdoor of smoke box.

§  Clean the inner and outer face of the sight glass.

 

YEARLY:

 

§  Lubricate the motors.

§  The burner adjustments might have been disturbed which will result in smoke and bad combustion.  Every burner should be overhauled at least once a year and regulated to ensure perfect combustion.

§  Loosen the door nuts and carefully swing open the boiler door.  Clean the tubes with a brush.  The brush must not be loose when inserted in tube.  A loosely fitting brush will not clean the tubes properly.  Also, the brush must pass through the full tube length.

§  The combustion chamber of boiler, superheater and economizer coils should be cleaned once a year.  However, quality of fuel and burner efficiency will determine the frequency of cleaning this.

§  Check the door refractory for any damage.  Repair, as necessary.

§  Close the door, carefully tighten the door nuts to make sure the door seal is fitted uniformly into the sealing ring.

§  When the boiler is fired after cleaning, check the door seal to make sure that there is no gas leak.  Tighten the door nuts nearest to any leak.

§  Clean the water side of the boiler thoroughly. If required descaling should be carried out.