1. Prepare the Boiler:

   • Take the boiler offline and ensure the pressure is dropped to zero.

2. Close Main Steam Valve:

   • Shut the main steam valve tightly to prevent chemicals from entering the steam system.

3. Safety Valve and Hose Setup:

   • Remove the safety valve and connect a 1/2″ hose from this outlet back to the external mixing tank for chemical addition.

4. Vent Arrangement:

   • Create a vent at the top of the boiler to release gases while preventing circulating water from escaping through the vent.

5. Isolate Feed Water Pump:

   • Isolate the boiler feed water pump and pressure control system, including sight glass valves, before adding chemicals.

6. Connect Bottom Blow Down Valve:

   • Use the bottom blow down valve to connect to the discharge of the recirculating pump for chemical entry.

7. Determine Chemical Quantity:

   • Assess the flooded water content of the boiler to calculate the required amount of cleaning chemical.

8. Prepare Mixing Tank:

   • Fill the mixing tank halfway to avoid overflow during the chemical addition process. Add the inhibited chemical (INDO 2200) to the tank.

9. Start Recirculating Pump:

   • Initiate the recirculating pump to introduce the chemical-water mix into the boiler from the bottom.

10. Chemical Addition:

    • Continue adding chemical to the mixing tank until the boiler is full and the water begins to return to the tank.

11. Increase Temperature (Optional):

    • If possible, start the boiler briefly to raise the circulating water temperature to 100-120°C, enhancing chemical reaction time.

12. Continuous Circulation:

    • Maintain circulation for a minimum of 8 hours.

13. Neutralizing Compound:

    • After circulation, add a neutralizing compound (e.g., caustic) to the mixing tank to adjust pH to 7.

CAUTION: Use gloves and safety eyewear when handling chemicals to avoid splashes.

14. Drain the System:

    • Stop the pump and drain the chemical-water mix from the boiler once cleaning is complete.

15. Flush the Boiler:

    • Open the manhole and flush all areas with a pressure hose.

16. Flush the Mud Drum:

    • Ensure the mud drum is also thoroughly flushed with a pressure hose.

17. Replace Gaskets and Refill:

    • Replace all hand hole gaskets with new ones and refill the boiler with soft water, opening the feed water pump valves.

18. Chemical Treatment:

    • Ensure the fresh water is treated with chemicals.

19. Check for Leaks:

    • Start the boiler and inspect for any leaks.

20. Normal Startup Procedure:

    • Follow standard boiler startup procedures at low fire.

21. Manual Blow Down:

    • Perform manual blow down more frequently over the next 3 days to remove any residual scale.