SECONDARY CONTAINMENT FAQ
Questions About Secondary Containment Coatings and Linings
The protective lining must be coordinated with the structure, stored materials, required containment period and cleanup plan.
What is secondary containment?
Secondary containment is the backup structure surrounding a tank, drum, pipe or piece of equipment. Its purpose is to capture an accidental release if the primary container fails and prevent the material from escaping into the surrounding property or environment.
What is the difference between primary and secondary containment?
Primary containment is the tank, drum, pipe or equipment that normally holds the material. Secondary containment is the surrounding floor, curb, basin, sump, trench or other structure intended to capture a spill from the primary container.
Why does concrete containment need a lining?
Concrete is porous and can be attacked by acids, alkalis, solvents and other chemicals. A compatible lining provides a protective barrier intended to resist the stored material and prevent it from penetrating the concrete during the required containment period.
Which materials are used for containment linings?
Systems may use epoxy, novolac epoxy, vinyl ester, polyester, polyurea, reinforced linings or other specialized materials. The appropriate chemistry depends on the chemical, concentration, temperature, exposure duration and condition of the substrate.
How is the correct lining selected?
The facility should identify every stored material, concentration, operating temperature, expected spill temperature and required containment time. Manufacturer resistance data is then used to determine whether a proposed system is suitable.
Does the lining cover floors and walls?
It should cover every surface included in the containment structure. This may include floors, curbs, walls, sumps, trenches, equipment bases and other surfaces that could contact the contained material.
How are joints and penetrations handled?
Joints, cracks, drains, pipe penetrations and transitions require compatible detailing. Some joints need flexible treatment or chemical-resistant waterstops rather than being covered with a rigid coating. The detail should reflect the expected movement and exposure.
How long must a containment lining resist a spill?
The required period depends on the facility, chemical, structure, cleanup plan and applicable requirements. Short-term splash resistance is not necessarily sufficient for a containment area expected to hold a chemical for hours or longer.
Can a containment area also be used as a working floor?
Yes, but the system must resist both chemical exposure and the expected traffic. Aggregate, additional build or reinforcement may be needed where carts, drums, forklifts or maintenance activity could wear or damage the lining.
Can an existing containment area be relined?
Possibly. The existing lining must be assessed for adhesion, compatibility, contamination and deterioration. Failed material normally needs to be removed, and damaged concrete, joints and transitions must be repaired before the replacement system is installed.
Does applying a lining certify the containment structure?
No. The lining is one component of the containment system. Structural capacity, volume, drainage, leak detection, regulatory compliance and required hold time should be established by the facility and its qualified consultants.
Where does Topseal install secondary containment linings?
Topseal installs commercial and industrial coating and lining systems throughout Vancouver Island, including Victoria, Duncan, the Cowichan Valley, Nanaimo, Parksville, Qualicum Beach, the Oceanside Region, Courtenay, Comox, the Comox Valley and Campbell River.