What is the purpose of conducting an evaporation test on a low-pressure boiler?

Conducting an evaporation test on a low-pressure boiler primarily serves to test the low-water cut-off control. This test is crucial for ensuring the safety and operational integrity of the boiler. The low-water cut-off device is designed to automatically shut off the burner when the water level in the boiler drops below a certain point. By performing an evaporation test, operators can simulate conditions under which the water level may decrease, allowing them to confirm that the low-water cut-off responds appropriately and shuts down the system as intended.

The importance of verifying the low-water cut-off cannot be overstated, as failure to properly control the water level can lead to severe boiler damage or even catastrophic failure. The evaporation test helps to ensure that safety mechanisms are functional and that the boiler operates within safe parameters.

While other options may relate to the boiler's operation, such as checking for leaks, measuring fuel efficiency, or evaluating overall performance, they do not specifically pertain to the essential function of testing the low-water cut-off control, which is the primary focus of the evaporation test.