All underground steel tank joints are flanged (including covers), adding rigidity to the body and creating a perfect assembly.
One-hundred percent of the welding of all our steel tanks are applied with semi-computerized submerged arc machines (SAW), which ensures complete penetration of the weld and establishes a permanent hermetic joint.
The primary tank is tested according to the UL58 standard then anchored with the first antioxidant. Afterwards, it is “adjusted”, using a thermofusion process; an imported high-density polyethylene jacket, fully endorsed by the UL1746 standard, which creates a true secondary containment. Finally, after sealing all the nozzles and the inlet, a vacuum is established in the interstitial space, which will be monitored until the day it is delivered to your service station and installed.
This tank combines the resistance of steel (and its compatibility with all fuels) and the elastic benefits of high-density polyethylene; that fits perfectly into the primary tank but never fails to act as a true secondary container. The combination of both materials maximizes both resistance and flexibility.
Each tank has an annual airtightness test system that consists of a vacuum gauge. This feature allows you to verify the pressure of both the primary, and secondary tank, as well as the interstitial space so you can verify the tightness when they are delivered to your service station and throughout the life of the tank. A 30-year written limited warranty guarantee is issued for each tank. Internally coated bottom with 100% solids polyurethane for preventing internal corrosion of the tanks interior. Each tank has the annual leak testing system consisting of a vacuum gauge checking the vacuum applied in the interstitial space, with which the tank leaves the plant, so you can verify the tightness of both tanks (primary and secondary) when delivered to you in your service station, as well as during the life of the tank. A 30 year limited warranty certificate is issued in writing for each tank.
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