Boiler Corrosion

Boiler CorrosionWhat is Boiler Corrosion?

Boiler corrosion is the active destruction of sound boiler metal by the pitting action of dissolved oxygen in the boiler water. This usually results in deep holes in the metal which are self protected by further corrosion products ie scabs or blisters over the hole which allow the chemical reaction to continue.

Thus generally large surfaces of the metal can be quite sound and yet an oxygen pitting site can develop deep penetration through boiler metal to cause ultimate failure. Untreated feedwater containing dissolved oxygen is highly corrosive to the steam boiler. While preheated feedwater and deaerators will greatly reduce the dissolved oxygen content of the raw water, it is essential to maintain adequate chemical reserves of an effective oxygen scavenger to avoid costly boiler metal corrosion and down time.

Why is Boiler Corrosion bad for my boiler?

Boilers are usually the heart of many manufacturing processes and corroded boilers can result in significant safety concerns and expensive downtime to effect repairs or replacements. The nominal cost of a water treatment program more than pays for itself by preventing these issues and providing efficiency through ongoing monitoring.

What is the solution to this problem?

Tandex water treatment additives ensure that any remaining oxygen that makes its way to the boiler in the feedwater is rapidly absorbed before it has the opportunity to form corrosion cells and blisters. Tandex’s organic tannin boiler water treatment also provide a monomolecular film on internal boiler surfaces which is elastic in nature to allow it to move with the expansion of the boiler metal thus preventing corrosion, while not impairing heat transfer properties.

Maintaining the target level of protective chemicals in your boiler water by implementing a regular service program will ensure the boiler stays clean and free of scale and corrosion problems.

What do I do now?

Tandex provides a range of specially formulated water treatment chemicals for steam boilers and heating hot water closed circuits which include:

  • corrosion inhibitors
  • scale inhibitors
  • alkalinity agents
  • dispersing agents
  • condensate line protection

Water samples should be taken from the system regularly and tested to confirm that the chemical values are being maintained. For a free on site review and assessment of your boiler treatment requirements, please contact us to discuss your particular application and corrosion problems.