- Aboveground Fuel Storage Tanks

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Convault - Aboveground Fuel Storage Tanks

You are probably aware that underground fuel storage tanks are a main source of soil contamination in this country. Underground fuel storage tanks corrode, leak fuel oil and gas into the soil and cause soil contamination. The contaminants may reach the underground water streams and could be carried into the drinking water systems. Decontamination of the underground fuel storage tank’s location is extremely costly and can have a devastating financial burden on tank’s owners and operators.

Regulatory agencies have enacted many guidelines requiring the owners and operators of the underground fuel storage tanks to install expensive leak detection and monitoring facilities to prevent costly contamination problems.

There are also many regulations covering installation and operation of “non-protected” aboveground steel storage tanks.

To solve the problems associated with the underground storage tanks and the non-protected aboveground steel storage tanks, ConVault® developed a breakthrough idea of constructing a tank that does not have the costly underground tank’s leak monitoring system and contamination problem and at the same time has overcome the problems associated with the unprotected aboveground steel tanks. Because of its unique monolithic concrete construction features, the ConVault® tank system provides two (2) hour fire protection, vehicle impact resistance and ballistic resistance proven by the tests carried out by the Underwriters Laboratories of USA (UL) and Canada (ULC).

The Aboveground Solution to the Underground Problem


Interest in the preservation of our environment has prompted all levels of government to issue strict guidelines for the installation, operation and removal of underground storage tanks (USTs). In the event of a leak, the actual costs for soil and groundwater clean-up can be catastrophic.ConVault’s innovative Protected aboveground storage tanks are the proven solution for these problems.

Primary steel tanks (including spill containment basins) are fabricated in accordance with UL Standard 142 (Seventh Edition). The assembly has passed numerous performance tests including 2-hour liquid-pool/furnace fire tests, vehicle impact and projectile-resistance investigations. The ConVault AST is listed in accordance with ULC 142.16, ULC 142.23 and UL Standard 2085 Insulated/Secondary Containment for Aboveground Storage Tanks/Protected Type.

Designed for Value


The ConVault AST system will provide ongoing value for fuel storage. More stringent regulations are consistently on the horizon; however, with a ConVault AST the need for updating is greatly reduced while operating costs are substantially lower than virtually any other AST available. The end result: The Owner/Operator of a ConVault AST is always provided with PEACE OF MIND. Realizing the diverse needs of our industry, ConVault has responded by expanding our product line to include tank sizes ranging from 125 to 12,000 gallons (including multi-compartment options).ConVault ASTs are shop-fabricated under strict quality controls in accordance with UL Standard 2085 and/or ULC CAN/ORD 142.16 and 142.23 for Protected Tanks. The unit is shipped as a finished assembly, normally limiting the need for major on-site work to providing a concrete pad and electrical service.


Primary/secondary containment, leak monitoring and spill containment are independently tested at the plants to insure proper performance in the field. Each unit is pressurized twice at the factory for leak-tight purposes prior to shipment in accordance with UL and ULC requirements, as well as patenting processes. ConVault ASTs are produced at manufacturing sites around the world.

Meets Government, Environmental and Fire Safety Regulations

ConVault ASTs meet all safety requirements for primary/secondary containment, leak monitoring, spill containment and overfill protection. ConVault ASTs have been approved by environmental/fire protection officials in over 27,000 global sites including all 50 states in the USA and all provinces in Canada, WITHOUT A SINGLE SYSTEM FAILURE! It is this historical performance that has been the cornerstone of regulatory comfort with the ConVault AST design. Each ConVault AST is exhaustively production-tested at the factory before shipment to its destination. ConVault ASTs meet NFPA 30/30A, UFC, BOCA and SBCCI fire safety requirements in the USA and provide grounding sources in accordance with electrical/fire code requirements. Additionally, ConVault ASTs have been certified by the California Air Resources Board for Phase I and II balanced vapor recovery, including methanol/ethanol blends.

Engineered for Safety


ConVault ASTs are engineered for tightness integrity, utilizing patented manufacturing procedures. The result is a seamless six-inch concrete vault which gives thermal/vehicle impact/projectile-resistant protection for flammable liquids. The system contains no cold joints or heat transfer points on the bottom or the sides. Over 30,000 ConVault sites remain in service throughout the world without a single system failure to-date. ConVault owner/operators also enjoy the peace of mind that comes with a standard 20-year or optional 30-year warranty.

Additional Features

The following is a list of some of the major features and advantages of the ConVault tanks:

1. Complying with Environmental and Fire Safety Requirements

  1. Convault tanks meet applicable safety requirements for secondary containment, leak monitoring, and spill protection. Convault tanks are approved by regulators and fire officials in most local jurisdictions of the United Sates and many foreign countries. Convault tanks are installed in 26 different countries worldwide.
  2. Convault tanks meet NFPA 30, NFPA 30A, UFC, BOCA, SBCCI, and IFC model fire codes safety standards. The units also comply with the 1996 Uniform Fire Code (UFC) Appendix A-II-F for the aboveground storage and dispensing of motor fuels.
  3. Convault tanks are certified by the California Air Resources Board for Balanced Phase 1 and Phase 2 Vapor Recovery including methanol and ethanol.

2. UL/ULC Listed

The Convault tanks have been tested and have passed all requirements of the following UL and ULC Standards:

  • UL - 142, aboveground tanks for flammable and combustible liquids.
  • UL - 2085, two-hour furnace fire test and two hour simulated pool fire test for insulated fire resistant and protected tank.
  • UL - 2085, insulated and protected secondary containment aboveground tanks for flammable and combustible liquids.
  • UL - 2085 and UFC SECTION (79-7) vehicle impact and ballistic impact test for protected tank.
  • UL – 2085/ULC S655 (CAN ORD-C 142.16) Non-Metallic Secondary Containment and Venting by Form-of-Construction.
  • UL – Standard 2244 Systems Listing for Motor Vehicle Fuel Dispensing.
  • UL CAN/ORD - C 142.16, protected aboveground tank assemblies for flammable and combustible liquids.
  • UL CAN/ORD - C 142.5, concrete encased aboveground tank assemblies for flammable and combustible liquids.
  • UL CAN/ORD - 142.16, the furnace burn and 142.5, the open (pool) fire testing for two-hour fire rating.

3. Overfill Protection

Tanks can be provided with the following methods to protect them against overfill:
 (a) direct reading level gauge at the tank which is visible from fill pipe location;
 (b) valve located within fill-pipe access to close or restrict flow automatically at a specified fill level;
 (c) audible high level alarm activated by a float switch at a specified fill level.

4. Venting

The Convault tank systems are furnished with a 2 inch normal vent and an emergency pressure relief system. The emergency relief system furnished with the tank normally opens if the tank pressure exceeds 1/2 psig. The tank systems conform to the national model fire codes and UL/ULC Standards for venting.

Convault secondary containment is listed by UL/ULC for “Venting by Form of Construction” and therefore is not required to be equipped with emergency venting device for secondary containment.

5. Support Legs

Vaults have concrete support legs of unitized monolithic construction that provide visual inspection capability. Tanks do not require cathodic protection system as no steel part of the tanks comes in direct contact with the ground.

6. Thermal and Corrosion Protection

The tank construction includes thermal insulation to protect against temperature extremes and corrosion by separating the steel tank from the concrete. No part of the steel tank comes in direct contact with concrete or other corrosive materials. All nipples, manway and spill container are powder coated for protection against corrosive elements.

7. Spill Containment

The tank system includes a 5 to 15 gallon, powder-coated UL-Listed and patented, spill containment surrounding the fill pipe. The spill container is equipped with a normally closed hand operated valve that can be actuated to drain the spilled fuel liquids into the primary steel tank.

8. Vehicle impact resistance

Convaulttanks are designed to have a low center of gravity that can withstand vehicle impact and tipping during earthquakes and other natural disasters. Convault tanks have withstood even phenomenal tests such as C-130 aircraft impact at Dobbins AFB in Georgia, Hurricane Andrew and the 1989 Loma Prieta earthquake.

9. Bullet Resistance

Convault tanks withstand bullet resistance tests in compliance with UFC SECTION (79-7) APPENDIX # A-II-F-1 and UL 2085 Standard for Protected tanks.

10. Non-Metallic Secondary Containment and Venting by Form of Construction.

The UL 2085 Standard listing officially recognizes Convault tank of having a secondary containment. Technically, this is equivalent to a protected and insulated double wall steel tank. Therefore, the Convault tank provides you a secondary containment equivalent to a double wall steel tank plus protection of six-inch reinforced concrete.

11. California Air Resources Board (CARB) Certified

ConVault AST's are CARB certified for use with Phase I and Phase II vapor recovery systems under Executive Order G-70-116 and revisions A through F. California is recognized as the national air quality expert and, having passed all field examinations by CARB, ConVault AST's are generally regarded as having met the severest air quality compliance standards.

Disaster Prevention


When Ultra Low Sulfer Diesel exploded due to a static spark in this aboveground fuel storage tank, the concrete shell of the ConVault absorbed the energy protecting the rest of the installation.


This 250 ton silo collapsed onto a ConVault. Thanks to ConVault's patented design, no fuel leaked. This was particularly important as an arc welder fire occurred next to the tank as a result of the silo collapse.


A warehouse fire occurred next to two ConVault ASTs. Firefighters actually used the tanks as a barrier position from which to battle the blaze. Although the metal buildings were consumed by the intense heat, the tanks were completely undamaged and remain in service today.

Flooding in an area containing some 3,000 ASTs resulted in dozens of UST wash-aways. ConVault Tanks survived without a single failure.

ConVault, Inc. - Oldcastle Precast
ConVault, Inc. - Oldcastle Precast
4109 E. Zeering Road
Denair ,  CA 95316


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