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BOILER CORROSION

Boiler corrosion most frequently is caused by dissolved oxygen, typically resulting in localized pitting which effect rapid penetration and tubes failure. Traditionally this problem has been approached utilizing some combination of external treatment (i.e.: Feed water heaters, deaerators, etc.) and internal chemical treatment (i.e.: Sodium Sulfite, etc. as an oxygen scavenger).

This program remains the favorite in Fire Tube boilers and older low heat flux Water Tube designs. This is particularly true where the operation and loads are relatively constant. Modern technology however, has led to the development of new film forming chemistries which are rapidly displacing sulfite programs in treating the new Low Water content – High Heat flux boiler designs.

These programs provide a protective film covering waterside boiler metal surfaces which maintains protection during idle periods and short duration shutdown times.

These blends of dispersants and corrosion inhibitors for boiler and condensate systems are ideally suited for systems that run less than 24 hours/day and are then shutdown.

Plants such as Laundries, Dry Cleaners, Greenhouses, Process Plants and many more are well suited for this program. If you are having problems maintaining sulfite values in your boiler or if you are experiencing corrosion on boiler tube surfaces, we can solve your problem immediately.

COOLING TOWER CHEMICALS

Evaporative cooling systems are used in comfort air conditioning and in Industrial applications to remove heat from the recirculating water. These systems need Water Chemical Treatment.

Circulating water is distributed over an effective dispersing media in the Tower. Forced air is pushed against this flow causing intimate contact with air and water resulting in rapid evaporation. Heat is released from the bulk circulating water and the water is effectively concentrated. In most installations, this concentration process will proceed to a level where some of these dissolved solids will exceed their solubility level and precipitate.

These precipitates will form deposits on heat exchange and distribution surfaces. The results are reduced flow, poor heat transfer and corrosion; ultimately resulting in system shutdown or failure. As the Chiller Condenser tubes develop deposits, the ELECTRICAL ENERGY COSTS TO OPERATE THE COMPRESSOR WILL INCREASE.

BACTERIA IN COOLING TOWERS

A third problem that develops in all exposed evaporative systems is the evolution of aquatic growth. Many forms of algae, bacteria, molds and fungi thrive in this environment.

This condition is exacerbated by the action of the cooling tower where the system functions as a giant scrubber removing particles from the air. The particles in themselves cause problems by contributing directly to deposit formation. In many cases they can also become a food source for bacteria. Heavy infestations of bacteria will result in slime and biofilm development. Biofilms, as well other forms of deposition, will result in reduced operating efficiency and corrosion.

The presence of many bacterial strains such as Legionella Pneumophila represents serious hazards to human health (i.e.: Legionnaire's Disease). This type of bacteria is normally carried in airborne water droplets. The water droplets can be passed into the heating and cooling ducts and end up where people live and work.

It is extremely important for many reasons that cooling systems are maintained as clean and corrosion free as possible.

Next Steps...

FOR A DETAILED EVALUATION OF YOUR WATER TREATMENT AND CONTROL PROGRAM, CALL US AND WE WILL BE HAPPY TO REVIEW YOUR SYSTEM AND DETERMINE WHERE SAVINGS CAN BE ACHIEVED BY IMPROVING YOUR CONTROL PROGRAMS.