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Dry layup procedure for your boiler

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Discover how to prepare a boiler for longer-term storage with Dave’s dry layup procedure

Byworth’s Chief Technician, David Tilleard returns to give you instructions on how to complete a dry layup procedure for your boiler.

By David Tilleard







This procedure is normally used when a boiler is going to be idle for more than a few weeks.

Dry layup, as the name suggests is achieved when the boiler is drained. However, it is a little more complicated than just draining the boiler and leaving it. If the boiler is left exposed to air, the variable temperatures, and humidity, will allow for significant deterioration to the boiler’s interior unless it is protected. The boiler needs to be free of moisture to prevent corrosion.

  • Allow the boiler to cool before draining
  • After the boiler is drained, close all drain valves
  • Open the inspection openings
  • Blow dry air through the boiler to remove any remaining moisture, paying particular attention to areas that are not free-draining
  • Put a package of desiccant such as silica gel, with a corrosion proof drain pan under it and close the boiler completely. Typically, you will need approximately 1.5kg of silica gel for each 1m³ of boiler, distributed proportionally across the water and fireside of the boiler

Note: Ensure the desiccant is checked every 6 months to guarantee it is still working. If any moisture is found in the drain pan, you need to replace the desiccant.

Discover David’s wet lay-up procedure instructions.

For more information on lay-up procedures, consult Byworth.