SOP for Starting and Stopping of Boilers

1.0 OBJECTIVE

To lay down the procedure for operation of boilers.

2.0 SCOPE

This SOP shall be applicable for boilers in utility block.

3.0 RESPONSIBILITY

Operator/Officer

4.0 ACCOUNTABILITY

Head of Engineering

5.0 PROCEDURE

5.1 FOR STARTING BOILERS

5.1.1 Ensure the feed water hardness is < 4 ppm at boiler feed water inlet line as per SOP for Water Softener.
5.1.2 Turn the main switch of Boiler to “ON” position on the boiler panel and press control “ON” green button, the light will glow.
5.1.3 Ensure day soft water tank is filled to an adequate level.
5.1.4 Ensure day furnace oil tank is filled to an adequate level.
5.1.5 Open fuel and feed water inlet valves.
5.1.6 Ensure blow-down, economizer drain and fuel drain valves are fully closed.
5.1.7 Start the electric heater and press oil circulation button to heat up the fuel till nozzle and return line. Observe the fuel temp indicator and ensure that temperature is above 115º C.
5.1.8 Keep the rotary switch in “Fill” position. The water feed pump will start. Check water coming out of the auxiliary steam line out side the boiler room.
5.1.9 Put the rotary switch in “FIRE” position. 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.
5.1.10 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.
5.1.11 In about 3 to 5 minutes steam will come out of the auxiliary steam valve. After pressure starts increasing, open the main steam stop valve gradually and close the auxiliary steam valve simultaneously.
5.1.12 Ensure steam pressure is between 9 kg / Cm² to 10. 5 kg / Cm².
Related: SOP for Cleaning and Maintenance of Boilers

5.2 FOR STOPPING BOILERS

5.2.1 Turn Fill / Fire switch of Boiler to “OFF” position.
5.2.2 Close the steam stop valve fully. The pressure switch will cut off the boiler.
5.2.3 Open the blow down valve fully and measure blow down time, it should not be more than 30 seconds. Blow down time is to be measured from 10 kg / cm² to 2 kg / cm² of steam pressure.
5.2.4 If blow down time exceeds 30 seconds, plan for de scaling of the coil.
5.2.5 Close the blow down valve, open the auxiliary steam valve and turn the switch on “FILº L” position. Water pump will be on and cooling will start. Let the steam temperature indication fall below 40º C. Turn the “FILL” key switch to “OFF” position.

6.0 ABBREVIATION

6.1 SOP: Standard Operating Procedure

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