02-15: Corrosion and Biofouling Control in a Refinery Cooling Water SystemExperience has shown that corrosion and biofouling control are important factors in operating a "clean" open evaporative cooling water system. Treated sewage water as make up to the cooling tower requires novel approaches to control corrosion and biofouling besides meeting environmental regulations. An intensive field study was conducted to evaluate the effectiveness of a non chromate treatment program. On line cleaning of the exchangers occurred

While the cooling tower had additional thermal capacity

operational flexibility and energy savings has been achieved

lower weight and corrosion resistance

Resulting restrictions in freshwater availability for evaporative cooling use may lead to potential production constraints

This paper will present current laboratory and field fouling evaluation methods

This includes the use of benzotriazole and substituted benzotriazoles

metallurgy

The new biocide is fast-acting and controls algal grow thin recirculating cooling water as well as algal biofilms on tower decks

The testing program embraced a variety of cooling tower designs and types of fill

bacteria growth necessarily leads to biofilm deposits within the cooling system

with an increasingly common choice being effluent from a publicly owned treatment works (POTW)

also known as the Federal Water Pollution Control Act