Boiler corrosion generally occurs when the boiler water’s alkalinity is low or when the metal is exposed to oxygen-bearing water, either during operation or during idle periods. Other impurities such as iron, silica, copper and oil may also be often found in samples of boiler scale.
Boiler corrosion can lead to deep holes developing in the metal casing. Pitting is often visible in the feedwater distribution holes, at the steam drum waterline and in downcomer tubes. Left untreated, boiler corrosion can affect the effectiveness of your boiler, lead to costly maintenance and repairs, and may even lead to boiler breakdown.
How can I prevent boiler corrosion?
It is possible to use a deaerator – a piece of equipment that heats water with steam to remove dissolved gases – to prevent boiler corrosion. If the cause is dissolved oxygen, sodium sulphite can be added to redress the balance.
Dissolved carbon dioxide is normally treated using neutralising or filming amines, depending on whether the goal is to neutralise the acid or to form a protective film over the metal.
However, the first step is to analyse the water that is feeding your boiler so you know what is causing the corrosion. If you aren’t sure, contact a boiler specialist who will be able to do this for you. Once you know what the problem is, for example the water is too alkaline or contains harmful impurities, you can decide on the right treatment.
Your boiler expert will be able to recommend the best course of action to ensure that no further corrosion takes place and that any necessary repairs are carried out before your boiler stops working altogether. A good boiler repair company will be able to deal with issues such as sludge build-up, unbalanced pH levels, oxygen removal, condensation treatment and high alkalinity levels.
Get in touch with DHS
Bristol-based boiler expert DHS has over 40 years of experience in dealing with boiler corrosion and many other boiler-related problems. If you suspect that your boiler is being corroded, give us a call. We will be able to ascertain the cause and undertake necessary boiler repairs in Bristol and the South West.
Call DHS today on 0117 924 7200, email us, or request a call back.