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SOP for Operation of Boiler

To lay down the procedure for the operation of boilers.

This SOP shall be applicable for boilers in utility blocks.


Head of Engineering

Starting of Boiler
  • Ensure the feed water hardness is < 4 ppm at the boiler feed water inlet line as per SOP for Water Softener.
  • Turn the main switch of the Boiler to the “ON” position on the boiler panel and press the control “ON” green button, the light will glow.
  • Ensure that the soft water tank is filled to an adequate level.
  • Ensure that the furnace oil tank is filled to an adequate level.
  • Open fuel and feed water inlet valves.
  • Ensure blow-down, economizer drain, and fuel drain valves are fully closed.
  • Start the electric heater and press the oil circulation button to heat up the fuel till the nozzle and return line. Observe the fuel temp indicator and ensure that the temperature is above 115ºC.
  • Keep the rotary switch in the “Fill” position. The water feed pump will start. Check water coming out of the auxiliary steam line outside the boiler room.
  • Put the rotary switch in the “FIRE” position. The blower, fuel pump and water pump will start. Sparking between burner electrodes begins, and fuel is sprayed after pre-purge timing. This “Pre – purging” is done to drive out any combustible gases that may be present in the Furnace.
  • Green lamp will glow, indicating “BURNER ON” fuel spray starts and the flame is established. Sparking will stop when the flame is established and heating of water will start in the coil.
  • In about 3 to 5 minutes steam will come out of the auxiliary steam valve. After the pressure starts increasing, open the main steam stop valve gradually and close the auxiliary steam valve simultaneously.
  • Ensure steam pressure is between 9 kg / Cm² to 10. 5 kg / Cm².

Stopping of Boiler
  • Turn the Fill / Fire switch of the Boiler to the “OFF” position.
  • Close the steam stop valve fully. The pressure switch will cut off the boiler.
  • Open the blow-down valve fully and measure the blow-down time, it should not be more than 30 seconds. Blow downtime is to be measured from 10 kg / cm² to 2 kg / cm² of steam pressure.
  • If the blow-down time exceeds 30 seconds, plan for the descaling of the coil.
  • Close the blowdown valve, open the auxiliary steam valve, and turn the switch on the “FIL ºL” position. The water pump will be on and cooling will start. Let the steam temperature indication fall below 40ºC. Turn the “FILL” key switch to the “OFF” position.

SOP: Standard Operating Procedure



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