The boiler blowoff valves are opened and closed in a specific sequence to:

The proper opening and closing of boiler blowoff valves in a specific sequence is essential to protect the valve closest to the boiler. When the blowoff valves are operated, there is a risk of thermal shock and sediment disturbance if done incorrectly. By following a specific sequence, it reduces the sudden pressure change and thermal stress on that nearest valve, thereby ensuring its integrity and function over time. Additionally, it helps maintain the overall stability of the system, reducing the risk of damage to components connected to the boiler. Taking proper precautions during this operation is crucial for the safety and longevity of the boiler system.