Convault above ground fuel tanks info
primary & secondary tanks
The primary steel tank is fabricated then is wrapped with a secondary containment before it is finally encased with a six-inch reinforced concrete vault.
The secondary containment provides spill containment and is made from a high performance, 30 MIL high density polyethylene membrane that encloses the primary tank.
Therefore, the Convault® tank provides you a secondary containment equivalent to a double wall steel tank plus protection of six-inch reinforced concrete. For more info.
concrete tanks built to last
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Rust Resistant.
The primary steel tank is isolated from the concrete encasement to prevent corrosion. In addition the concrete creates a barrier to environmental elements like rain and salt. This provides decades of rust resistant primary tank service. Owner’s Manual
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Fire Protection.
The seamless six-inches of reinforced concrete provides a two-hour fire protection. In addition the monolithic concrete vault and insulation provide thermal protection from the environment.
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Impact Resistant.
The six-inches of reinforced concrete protects the primary steel tank from vehicle impact and is blast resistant. During testing Convault tanks withstood the vapor cloud blast, a 50 lb TNT blast centered at 5 feet from the tank, and a 500 lb TNT blast centered at 20 feet from the tank. Check out the what the manufacture has to say.
FAQs
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Cracks are normal for a monolithic concrete structure. The expansion and contraction cause cracks to form over time. Convault tanks must be repaired and sealed using the manufacturer’s approved methods.
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Water will intrude into the interstitial space and begin to fill your secondary without proper sealing and maintenance. The water must be removed by placing the entire vault under vacuum (not just shop vac) and sealing the intrusion points.
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When cracks form on the bevel some of the water intrudes into the secondary and sometimes it migrates between the secondary and the concrete wall. This water is trapped and leaches calcium carbonate from the concrete. This does not compromise the integrity of the tank but must be repaired by using the manufacturer’s approved methods.
Convault Conversion Charts
When using these charts please take into consideration that fuel volume will change approximately .5% for every 10 degrees F change in fuel temperature.
4,000 Gallon