Which of the listed absorbing agents could...

🔍 Key Concepts

• Purpose of a dry lay up for a boiler and what risk it is trying to prevent inside the boiler pressure parts • Difference between desiccants (drying agents) and chemical conditioning agents used while the boiler is in service • Which listed chemicals are commonly used to absorb moisture from air in enclosed spaces

💭 Think About

• First ask yourself: during a dry lay up, is the boiler meant to be full of treated water, or empty and protected from moisture in another way? • Look at each option and decide whether it is primarily used for water chemistry control while operating or for absorbing moisture from the atmosphere in an idle space. • Eliminate any chemicals whose main function is to adjust pH, control oxygen, or condition boiler water, rather than physically absorb moisture.

✅ Before You Answer

• Confirm which choice is a well‑known desiccant used to keep equipment interiors dry during storage. • Verify that the selected agent can safely sit in trays or containers inside an idle boiler without being dissolved in boiler water. • Make sure the agent you choose is associated with moisture absorption from air, not with softening, salting, or chemically treating boiler feedwater.

Which of the listed absorbing agents could be used in a boiler during a dry lay up period?

Sodium hydroxide

Sodium chloride

Deactivated hydrazine

Silica gel

🔍 Key Concepts

💭 Think About

✅ Before You Answer