Surprises within Packaged Units

Sometimes equipment that is rented or purchased as a packaged unit allows out-of-spec components to enter a chemical plant. Air compressor systems, refrigeration units, and boiler systems are prime examples of units that, if improperly specified, may allow out-of-spec elements into a refinery or chemical plant. 

Another example of out-of-spec equipment is the use of filters on a unit. Many packaged units are equipped with filter cartridge bodies that have zero corrosion allowance and are not as robust as other equipment purchased for the process. 

Anyone who reads this chapter should have a clearer understanding of the need for and the value of well-maintained and up-to-date specifications. 

Institution of Chemical Engineers, Furnace Fires and Explosions, Hazards Workshop Module 005, Rugby, U.K. (available as a training kit with 23 35mm slides, booklets, teaching guides, and related materials). 

K letz, Trevor A., Critical Aspects of Safety and Loss Prevention. London Butterworth, 199U, p. 183. 

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