The Marley Difference – Counterflow Performance
Experience has shown that cookbook combinations of laboratory component data do not yield expected results in full scale performance. In order to develop valid cooling tower performance prediction, experience in field testing a variety of tower configurations is essential.
The Marley Difference – Lumber
As lumber goes through cycles of alternate wetting and drying, the wood swells and shrinks twice as much along each growth ring as it does across growth rings. Internal stresses build up, making the board warp and twist. This problem becomes severe in boards containing heart centers.
The Marley Difference – Pressure Treatment
Lumber used in cooling tower construction must be treated with a reliable preservative compound to prevent decay. The industry's current preferred treating chemical is Chromated Copper Arsenate (CCA), a waterborne formulation which prevents biological attack by fungi or other microbes. Other preservatives are also available.
The Marley Difference – Redwood Lumber Grades
While both appearance and structural grades of redwood lumber are defined by appearance or visual characteristics, they have very different applications. For cooling towers and other structural applications, grading rules for structural grades of redwood establish requirements for strength characteristics such as slope of grain, knot size and frequency, and rate of growth.
The Marley Difference – Fan Cylinders
The fan cylinder does far more than protect operating personnel from a rotating fan. It is a vital link in the chain of critical components that contribute to the overall efficiency of the cooling tower. When correctly designed, manufactured and applied, it assures that the fan will be capable of moving the maximum amount of air through the tower at the minimum required horsepower.
The Marley Difference – Geareducer Drive
Marley Geareducers have been manufactured in a variety of sizes and load ratings appropriate for cooling tower applications since the 1930s. We began doing so because geared speed reducers suitable for cooling tower service were not commercially available. Since that time, we have produced well over 100,000 units, and have established an unparalleled record of performance reliability.
Corrosion Protection for Cooling Towers
The forces of corrosion (as the term is being used in this paper) are those elements or compounds whose natural tendency is to chemically or electrolytically react with a metal, given the opportunity and a proper set of circumstances.
Cooling Towers and Salt Water
For cooling tower service, any circulating water with more than 750 parts per million chloride expressed as NaCl is generally considered as salt water. However, the effects of chlorides will be much less severe at 750 ppm than they will at higher concentrations.
