What is the recommended material and amount for moisture absorption during a boiler dry lay-up?

In a boiler dry lay-up, the goal is to prevent moisture from accumulating within the boiler, which can cause corrosion and other forms of damage. The correct answer highlights that both Quicklime and Silica gel can be utilized effectively for moisture absorption, each serving slightly different purposes.

Quicklime, or calcium oxide, is a powerful desiccant that reacts with moisture in the air, effectively lowering the humidity levels within the lay-up environment. It's generally used in larger quantities because it has high moisture absorption capacity. The recommended amount of Quicklime is around 1 kg per cubic meter, which helps ensure that any residual humidity is captured effectively.

Silica gel, on the other hand, is also a highly effective desiccant primarily used for smaller applications or in more sensitive environments. It can absorb up to 40% of its weight in moisture and is often used in conjunction with Quicklime to provide additional moisture control. The recommended amount for Silica gel in this scenario is about 3 kg per cubic meter, allowing for enhanced protection against condensation and moisture buildup.

Using both materials together combines their strengths: Quicklime’s strong moisture absorption capabilities with Silica gel’s efficiency and safety in various environments, thus offering a robust solution for maintaining dryness in a boiler