Table 9175 Construction Materials For Tower Shells With A Packed Air Stripper

Material

Advantages

Disadvantages

Aluminum

Carbon Steel

Fiberglass

Stainless Steel

Concrete

Metal lined block and brick

Lightweight Low cost

Corrosion resistant Excellent structural properties Long life (> fifteen years) No special coating required Mid-range capital cost Good structural properties Long life if properly painted and maintained Low cost

High chemical resistance to acidic and basic conditions, chlorides, and metals

Highly corrosion resistant Excellent structural properties Long life (> twenty years) No special coating required Aesthetics

Less prone to vandalism

Aesthetics

Less prone to vandalism Prefab air stripper insert eliminates problems associated with cast in place towers

Poor resistance to water with pH

less than 4.5 and greater than 8.6 Pitting corrosion occurs in the presence of heavy metals Not well suited to high chloride water

Requires coating inside and outside to prevent corrosion, leading to increased maintenance Heavier than aluminum or FRP Poorly defined structural properties Short life (< ten years) unless more expensive resins used Poor resistance to ultraviolet (UV) light (can be overcome with special coatings that must be maintained) Requires guy wires in most situations Susceptible to extremes of temperature differential disturbing tower shape and interfering with distribution Most expensive material for prefabricated towers Susceptible to stress fracture corrosion in the presence of high chloride levels Difficult to cast in one place leading to potential difficulties with cracks and leaks More expensive than self-supporting prefab towers More expensive than self-supporting prefab towers

Source: K.E. Nyer, 1992, Groundwater treatment technology, 2d ed., New York: Van Nostrand Reinhold.

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