Tower Specification Guide

With the exception of small compact units, cooling towers are purchased on competitive bids. The purchaser is responsible for providing all the specifications pertaining to the working conditions of the future installation. As a general rule, large units require more detailed specifications. 

Purchasing specifications include not only performance data, materials, structural details, plot plan considerations, guarantees, etc., but also methods of bid evaluation, applicable unit costs, energy costs and amortization period. A good group of specifications will permit a true cost comparison of competitive towers on an installed, as well as on an operating, basis. Table 6.3 summarizes the normal specifications that should be considered. 

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To facilitate specific elevation requirements for level instruments or positioning a maintenance access, nozzles may be located off the main axis. These nozzles are generally referred to as hillside nozzles. A typical hillside nozzle is shown in Exhibit 5-15- Tall vertical drum nozzles should be elevated and oriented using the tower subjea as a guide. It should be noted, however, that nozzle locations are not restricted by internal components, as is die case for the distillation tower. More information on vertical drums is available in Chapter 10, Towers. 

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