The Plasteel® Double Wall Composite Tank
The Plasteel® Double Wall Composite Tank is UL Listed and Tested per UL Standard 58 and UL Standard 1746, Part II, Type I and Type II Secondary Containment.In 1983, the Plasteel® Double Wall Composite Tank was the first tank to achieve the UL Listing for Composite Secondary Contained Tank.
The inner primary steel tank is assembled, welded and tested for tightness. The primary steel tank provides the underground structural performance for the Plasteel® Double Wall Composite Tank. The outer steel secondary containment tank is assembled and welded 360° around the inner primary tank creating an interstitial space. The interstitial space between the primary tank and the secondary containment tank is designed to provide access to detect a liquid in the interstitial space and containment of the liquid.
The Plasteel® Double Wall Composite Tank has been UL performance tested per the optional UL Standard 58, External Pressure Test (EPT), Paragraph 18. The EPT requires no structural deformation when an empty steel primary tank is submerged with five feet (1.53m) of water over the top of the tank without backfill materials.
The Plasteel® exterior bonded fiberglass reinforced plastic (FRP) laminate encapsulates the steel secondary containment tank providing a UL Listed and Tested exterior corrosion protection system for the Plasteel® Double Wall Composite Tank.
The first Plasteel® Double Wall Composite tank was installed in 1983.
There has never been a documented external corrosion failure of any Plasteel® tank.