Best Practices for Boiler Descaling


If you are in charge of maintenance for a company, school, or other organization that has a large boiler on its premises you will want to know the best practices used for boiler descaling. Descaling is a very important process because it helps prevent debris, dirt, and other items from building up inside the boiler. If these items build in the boiler they can cause damage to the boiler and other equipment that can be quite costly to repair. Follow these steps to properly descale a boiler and boiler feed water pump.

The best way to descale a boiler is known as the circulating. The steps you should follow to descale a boiler using circulating are:

Drop pressure in boiler to zero after taking it offline.

Shut the main stream valve so no water gets in or out of the system.

Remove the safety valve to connect a hose that will help add the descaling product.

Create a vent at the top of the boiler to allow for gases to escape.

Use a valve to isolate the boiler feed water pump.

Take a scale sample from the boiler and test it.

Add the scaling solution to the boiler until it is full and water begins to flow to the mixing tank. The amount of water should only be added so that the pump suction is covered.

The mixing tank should only be filled halfway so any water that returns does not cause gas to overflow.

Activate the recirculating pump.

Let the circulation go on for at least eight hours to descale the boiler.

Keep an eye on the strength of the acid in the mixing tank. Add more acid if the levels drop.

Raise the PH to 7.0.

Once the circulation is done you can drain water from the boiler.

Use a pressure hose to flush the system from the top down.

Replace all of the parts of the boiler.

Test the boiler to ensure it works properly.

Follow these steps to ensure the correct cleaning process for your boiler system.

Tagged:  boiler feed pump
  • 02/21/2018

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