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secondary-containment-1Secondary containment is defined as a means of surrounding one or more primary storage containers to collect any material spills in the event of container failure.  It is surprising that some liquids you can drink could cost you thousands of dollars if your tank leaked into surrounding rivers, lakes and ground water. A few years ago, a beverage company had a major spill of a drinkable product and the Environmental Protection Agency (EPA) fined them thousands of dollars. It turns out aquatic life in a river will not survive on “soda pop”, a popular drink that contains a mild acidic acid. This is safe for human consumption, but not so much for the fishes.

 
Regulations on secondary containment for hazardous materials consist of 5 main considerations.
  1. The containment area must be resistant to spills and free of cracks and open areas.
  2. The containment area should be sloped or designed to quickly and easily remove spilled liquid.
  3. It must have sufficient capacity to contain at least 10% of total volume of the primary containers or 100% of the largest container.
  4. Rain must be prevented from entering the containment area unless the containment area has sufficient capacity to hold additional volume plus the requirements.
  5. Material that has spilled or leaked into the secondary containment area must be removed as soon as possible to prevent overflow.

secondary-containment-2State and local codes for secondary containment are different for different areas of the United States. It is always advised to check your local EPA offices for local secondary containment codes as these codes are frequently revised.

Concrete is the more common material used in construction of containment areas. Since concrete is a porous material that allows liquids to pass through, these concrete containment barriers must be coated to ensure spill containment. Fiber glass reinforced polymers are usually applied to concrete secondary containment structures used for protection of chemical spills. They must have protective linings or coatings to prevent spills from attacking the porous concrete and/or penetrating existing cracks and control joints.  These polymer resin systems are fluid applied coatings or linings and are installed on site.

Epoxy vinyl ester resins provide the best overall resistance to a wide range of acids, alkalis, bleaches and solvents for use in many chemical processing applications. They offer excellent toughness and provide exceptional thermal resistance properties. The systems are designed to be applied as a coating, seeded floor or fiberglass reinforced system, providing impact and crack bridging characteristics.

Is chemical containment a concern in your business processes? Protective Industrial Polymers offers a complete line of vinyl ester coating and containment systems. Click the following link to learn more about InhibiChem Vinyl Ester Systems. 

Ted Williams