Boiler Blowdown Tanks

• INDUSTRY SIZING EXPERTS – Madden has over 65 years of experience with designing boiler blowdown tanks. We can assist in designing vessels to meet NB-27 standards as well as recommend more cost effective sizes which will still be safe and appropriate per your boiler room’s blowdown parameters.
• TRUSTED DESIGN – the size of traditional blowdown tanks withstand the violent blowdown process much longer than smaller separator vessels. Plus quenching water is not required when sized correctly, eliminating added water consumption and utilities costs.
• CONSTRUCTION – ASME Div I, Sec VIII Vessels, 50 PSI DWP @ 450 deg F, with National Board serial number included.
• MORE CALCULATION & DESIGN SUPPORT – Madden can also assist in sizing a quenching water spool and/or include other blowdown processes to be sized into a single tank.
• CONTACT US to start your boiler room’s next traditional blowdown tank design.

Madden can also design blowoff tanks to meet your specifications. We follow the “National Board Rules and Recommendations for the Design and Construction of Boiler Blowoff Systems”. If you have requirements that go outside of our standard product line, let us know your requirements and we’ll design a unit for your consideration. Check out the picture of what we called a BD9600, this unit was over 8 feet tall. No matter the boiler size, if you need an ASME coded tank for boiler blowdown water Madden Engineered Products has you covered.

Why a Blowoff Tank is Needed

In summary, by Madden: boiling water causes scaling and deposits to form resulting in a less efficient boiler and a less efficient boiler means increased costs. Because of this, boilers need to be intermittently, and sometimes continuously, flushed of a certain percentage of their water. Therefore, boiler rooms need blowoff tanks to meet legal regulations and to safely dispose of hot, dirty boiler blowdown.

In more detail, information from The National Board of Boiler and Pressure Vessel Inspectors: The treatment of boiler water is an integral part of boiler operation, used to control scaling, corrosion, and deposits. Boiler water treatment often leads to the formation of solid particles that are initially suspended in the boiler water. Solids concentrated in boiler water tend to promote foaming and scaling with a resultant loss of heat transfer which may result in overheating of the boiler tubes. Solids also may settle to the bottom of the boiler to form sludge. “Blowing off” part of the boiler water is a means of removing solids from the water while controlling boiler water levels.