Which of the following actions should be taken when preparing for a boiler system lay-up?

The correct answer encompasses a comprehensive approach to preparing for a boiler system lay-up. Taking all these actions ensures that the system is properly maintained and protected during periods of inactivity.

Filtration of the water is critical because it removes impurities that could lead to corrosion or scaling within the boiler when it is not in operation. Using clean water helps prevent any contaminants from settling and causing long-term damage to the system.

Insulating all valves is also an essential step, as it helps retain heat and prevents external moisture from affecting the valves. Proper insulation minimizes the risk of freezing in colder climates, which can damage the valve components.

Checking for leaks is vital before laying up the system because undetected leaks can lead to water loss and compromise the state of the boiler. Ensuring that all components are leak-free helps maintain integrity and safety during downtime.

By performing all these actions collectively, operators ensure that the boiler system remains in optimal condition during a lay-up, thereby facilitating easier future startups and reducing the potential for maintenance issues when the system is brought back online.