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The Best Secondary Containment System for Your Application

In the United States, hazardous materials are regulated by the EPA, Occupational Safety and Health Administration (OSHA), Department of Transportation (DOT), and possibly local agencies as well. Each organization has its own definition of hazardous materials.


OSHA defines a hazardous chemical as any chemical that is classified as a physical hazard or a health hazard, a simple asphyxiant, combustible dust, pyrophoric gas or hazard not otherwise classified. The EPA expands that definition to include any chemical that can cause harm to people, plants or animals when released by spilling, leaking, discharging or leaching (among other methods).

The EPA regulates chemical containment requirements under 40 CFR 264. Federal law says that a containment system “must have a sufficient capacity to contain 110% of the volume of the containers or the volume of the largest container, whichever is greater.” In other words, you need to be able to contain the volume of the tanks, plus an extra ten percent. Some states have stricter standards, which supersede the Federal regulations.

If you’re storing hazardous chemicals, your chemical tank in most cases must have some kind of containment barrier. If a leak occurs, the containment should be designed to prevent the chemical from coming into contact with the environment and your employees.

Usually, companies use a large concrete berm to contain spilled chemicals. It can be an effective solution if your only concern is containment. But concrete berms are a poor solution for your operations. In most cases, the concrete berm collects dirt, rainwater, and other foreign matter. Any chemical that spills into the berm can become contaminated and could be wasted. Berms also require a lot of space because they must provide a capacity of at least 110 percent of the primary tank according to federal regulations. Constructing a containment berm can be an expensive operation, as well. It can be a costly way to run your operations.


Peace of Mind with Poly Processing’s SAFE-Tank®

Poly Processing helps reduce overall costs with our innovative double-wall “tank within a tank,” called the SAFE-Tank®. The SAFE-Tank is the industry leading double-wall storage system that has an interstitial space between two tank walls. If a leak occurs in the primary tank, all of the leaked chemical is designed to stay within the interstitial space—preserving your chemical while containing the spill in a small footprint.

The SAFE-Tank meets and exceeds Federal regulations. In fact, Poly Processing may be the only tank manufacturer that completely meets 40 CFR 264.

Check out this video for a closer look at how the industry leading SAFE-Tank® system works.


Business Advantages of the SAFE-Tank

The SAFE-Tank system offers safe storage of a wide variety of chemicals without the expense of needing to construct permanent containment, such as a concrete berm or basin. This gives you cost effective flexibility for changing industrial applications. As chemical storage configurations may change to meet dynamic needs, you can move chemical storage without incurring the expense of additional containment structures.

The SAFE-Tank double wall system also provides the following advantages for your business:

  • 110% secondary containment. The double wall chemical storage tank system uses equalization to provide a minimum of 110% of the working volume of the primary tank.
  • Liquid equalizes in the event of a leak. This allows you to continue using the chemical within the primary tank until the tank system can be emptied, inspected, and repaired if necessary.
  • Durable polyethylene. The outer tank is constructed with the same high-density crosslinked polyethylene (XLPE) as the inner storage tank. XLPE is specifically engineered to accommodate the demands of chemical storage.
  • Lower costs and maintenance. The self-contained double wall that a SAFE-Tank offers is much less expensive upfront and easier to maintain than a concrete berm or basin.
  • Ideal for sulfuric acid and other harmful chemicals. The double wall storage tank eliminates potential exposure and dangerous chemical reactions, such as sulfuric acid to water.
  • Excellent for outside storage. The SAFE-Tank secondary containment vessel is sealed from the elements and designed so that no debris or rainwater should contaminate the chemical being stored.
  • Bottom discharge. A bellows transition fitting enables discharge from the bottom of the tank, while maintaining the integrity of the containment. The bellows transition fitting permits safe chemical discharge from the primary tank. It also allows the tank to expand and contract due to filling, emptying, and temperature variation.

The SAFE-Tank is designed with wall thicknesses equal to or greater than that required by ASTM D-1998 standards. The system is available from 55 gallons to 8700 gallons.

Download the Safe-tank Guide

SAFE-Tank Accessories

Poly Processing’s double wall SAFE-Tanks tanks can be customized by adding accessories to fit your specific needs. Some of our most popular double wall tank accessories include:

  • Bellows Transition Fitting
  • Seismic Restraint Systems
  • Wind Restraint Systems
  • Ultrasonic level Indicator
  • Leak Detection Systems
  • Heat Maintenance Systems
  • Ladders
  • Overflow Assembly
  • Fill Lines

The Smart Chemical Storage Solution

Safe chemical storage is smart chemical storage. The costs associated with damage from a chemical leak or spill are serious for any business. In addition, it is expensive to take a tank offline and interrupt operations for repair. The SAFE-Tank system helps to eliminate these costs, maintenance and safety concerns while reducing the footprint to the area of a standard upright storage tank.

Reduce Your Operational Losses with Double Walled Piping

The SAFE-Tank can be double-wall piped from the tank to any location in your facility using a true double-wall bellows transition fitting. This important fitting drains the primary tank through the containment tank while acting as a secondary containment around the fitting. You can mount a 6-inch flange to the outside of the transition fitting and run double-wall piping while keeping everything fully contained.

Learn more about secondary containment and our SAFE-Tank in our comprehensive secondary containment guide.

Download the secondary containment guide

Topics: Tank Design and Materials, Chemical Storage