Boiler blowdown is the removal of water from a boiler. Its purpose is to control boiler water parameters within prescribed limits to minimize scale, corrosion, carryover, and other specific problems. Blowdown is also used to remove suspended solids present in the system. These solids are caused by feedwater contamination, by internal chemical treatment precipitates, or by exceeding the solubility limits of otherwise soluble salts. In effect, some of the boiler water is removed blowndown and replaced with feedwater.
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Boiler Blow Down Valves
Boiler blowdown - Wikipedia
The boiler blowdown procedure is the purposeful discharge of water from the boiler. This practice works to avoid the build-up of concentrated impurities inside of the system. These byproducts and impurities are the result of the continual evaporation of steam. While most people think boiler water is pure, it's actually chemically treated in a manner similar to tap water.
Selection of Blowdown Systems
Over time, the concentration of dissolved solids from the make-up water increases in the boiler as pure water is removed as steam. Water is drained, or blown down, from the boiler periodically to maintain a consistent number of cycles of concentration. This process is essential to the prevention of scale and corrosion in your boiler. Only pure water leaves the boiler as steam is produced; any dissolved solids are left behind.
When a boiler releases steam, it leaves behind any dissolved solids and impurities. The more your organization uses a boiler, the more solids are left over in the make-up water, which leads to corrosion and scale. The boiler blowdown valve sequence is what completes the process of draining. If the boiler blowdown valve sequence is not conducted frequently enough, your boiler will fill with anything from sludge, to the hard calcium scale known as mud drum. It renders the boiler ineffective and inefficient, because all of that build up, in whatever form it takes, makes it harder for the boiler to transfer heat.