Materials Performance Supplements

TANK 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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3 TANK CORROSION CONTROL SUPPLEMENT TO MP MATERIALS PERFORMANCE MAY 2018 Storage Tank Corrosion—An Introduction Leaking storage tanks, whether above or below the ground, can pollute the envi- ronment, threaten public health, and lead to billions of dollars in direct and indirect costs. One main reason for storage tank fail- ure is corrosion. Fortunately, corrosion pre- vention technology exists that can protect storage tanks and keep them structurally sound for years to come. Government and the public understand the extent to which leaking tanks can dam- age the environment and threaten public health. To prevent environmental contami- nation , U.S. federal regulations require those who own or operate underground tanks and the connected piping to have spill , overfill , and corrosion protection mechanisms in place, and many U.S. states have additional tank protection require- ments. The owners/operators of tanks who fail to comply with these regulations can be subject to both civil and criminal penalties. Why Do Storage Tanks Corrode? Corrosion i s th e det erioration of a material, usually a metal, that results from a chemical or electrochemical reaction with its environment. Without implemen- tation of appropriate corrosion-control measures, storage tanks will deteriorate. Most tanks are made of steel, a material highly susceptible to corrosion . Corro- sion-related damage is accelerated by fac- tors including the tank's interaction with int erconn ect ed compon ents, corrosive environmental conditions, and stray elec- tric currents. Over time, uncontrolled cor- rosion can weaken or destroy components of the tank system, resulting in holes or pos- sible structural failure, and release of stored products into the environment. How Do We Control Corrosion in Storage Tanks? Modern corrosion control combines historically proven methods with state-of- the-art technolog y to p r e v e n t t a n k s f r o m det eriorating. Corro- sion-control strategies are used individually or in c ombination w ith one another. Common strategies include cor- rosion-resistant mate- r i a l s , a p p l i c a t i o n of coatings and/or linings as a barrier to the envi- ronment, various forms of cathodic protection to prevent deteriora- tion of t ank c omp o - nents in contact with th e s o i l , a n d u s e of inhibiting chemicals in stored substances to control corrosion of the tank interior. Planning and Training Are the Keys to Success Corrosion control c a n p r o t e c t s t o ra g e t a n k s , t h e e n v i r o n - ment, and the bottom l i n e o f o w n e r s a n d operators. It must be an integral part of a stor- age tank own ers'/op erators' long-t erm planning. Tank owner support of corrosion control is vital, but comprises only half of the solution. Long-term planning for corro- sion control must include ongoing educa- tion and training for persons responsible for operating tank systems. These individu- als must be able to recognize the early signs of corrosion and effectively prevent it. Own- ers and operators must also dedicate the resources required to monitor and main- tain these corrosion protection systems to ensure the effective protection of the envi- ronment and their economic interests. Tank Protection Articles Conclusions Above- and underground storage tanks could leak hazardous substances into the environment that contaminate our soil and water. Often, corrosion is to blame; how- ever, corrosion is not a mystery—it can be prevented and controlled. By implementing comprehensive corrosion control for stor- age tanks, the environment can be pro- tected cost-ef fectively while billions of dollars are saved each year. Source: NACE International web site: www.nace.org. Corrosion is a leading cause of storage tank failure. Fortunately, there are many ways to prevent this problem.

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