A boiler is a critical component in many industrial processes, and it is important to maintain it properly to ensure its efficient operation. One of the essential maintenance procedures for a boiler is a blowdown. Boiler blowdown is the process of removing water from the boiler to reduce the concentration of dissolved solids in the water. In this article, we will discuss everything you need to know about performing a boiler blowdown.

Why Is Boiler Blowdown Important?

Boiler blowdown is essential to remove impurities from the water in the boiler. Over time, dissolved solids, such as calcium, magnesium, and silica, build up in the water, which can cause scaling and corrosion in the boiler.

Scaling reduces the efficiency of the boiler, resulting in increased fuel consumption and energy costs. Corrosion can cause leaks and other damage to the boiler, which can be expensive to repair or replace. Boiler blowdown also helps to maintain the pH level of the water, which is critical to preventing corrosion.

Types of Boiler Blowdown

There are two types of boiler blowdown: continuous blowdown and intermittent blowdown.

Continuous Blowdown

Continuous blowdown is a process in which a small amount of water is discharged from the boiler continuously to maintain the desired concentration of dissolved solids in the water. The amount of water discharged is usually less than five percent of the total water in the boiler.

Intermittent Blowdown

Intermittent blowdown is a process in which a large volume of water is discharged from the boiler periodically to remove the accumulated impurities. The frequency and duration of intermittent blowdown depend on the type of boiler, the operating conditions, and the quality of the feedwater.

How to Perform a Boiler Blowdown

To perform a boiler blowdown, first, check the water level and pressure in the boiler to ensure it is safe to perform the blowdown. Next, close the steam valve and slowly open the blowdown valve to release a small amount of water continuously for the continuous blowdown method or release a large volume of water for the intermittent blowdown method.

Monitor the water level and pressure during the blowdown process and adjust the valves as needed. After the blowdown is complete, close the blowdown valve and slowly open the steam valve to return the boiler to normal operation.

Safety Precautions

Performing a boiler blowdown can be dangerous if proper safety precautions are not taken. It is important to wear appropriate personal protective equipment, such as gloves and eye protection, to avoid contact with hot water or steam.

Before performing the blowdown, ensure that all personnel is clear of the area and that warning signs are posted. It is also crucial to follow proper lockout/tag-out procedures to prevent accidental activation of the boiler.

Additionally, proper training and certification should be provided to operators who perform boiler blowdowns to ensure they are aware of the potential hazards and know how to safely perform the procedure.

Final Thoughts

Performing a boiler blowdown is not only essential for the smooth operation of boilers, but it is also a critical component to ensure the safety of personnel and equipment. Neglecting this maintenance procedure can lead to costly repairs, reduced efficiency, and even accidents. By removing impurities from the water in the boiler, boiler blowdown helps to prevent scaling and corrosion, ensuring the efficient operation and longevity of the equipment. It is important to note that safety should always come first when performing a boiler blowdown, and following recommended safety procedures is crucial to avoid hazards.

Maintain your boiler with the help of L.J. Kruse Co. We are a family-owned and operated plumbing, heating, and cooling company that provides commercial HVAC services in Berkeley. We’re here for all of your large or small plumbing, heating, and cooling needs, from leaky faucets to whole-house re-piping projects. Request a service now!