The BTU®, Biofuel Tank Upgrade, is a cost-effective solution for upgrading existing fiberglass single-wall and double-wall tanks to meet new regulations. Many of the earliest generation fiberglass tanks were not tested nor were they warranted for either biodiesel or ethanol blends exceeding 10%. Upgrade your tank to full compatibility with green fuel blends like E15, E85 up to E100.


The BTU® can be applied in combination with typical tank upgrades like sumps and collars or as a stand-alone service. Unlike conventional tank lining methods, the BTU® upgrade is completed by CSI technicians who are experts in fiberglass tank manufacturing techniques.


In most cases the candidates for the BTU® are older tanks. All Containment Solutions single-wall and double-wall storage tanks are compatible with ethanol blends up to E100 and biodiesel blends up to B100.




  • 1 - Year limited warranty
  • Eliminates costly tank replacement and downtime
  • Ethanol and ethanol blends from 0-100% including E15 and E85



  • API 1631
    • Complies with American Petroleum Institute Standard.
    • Interior Lining and Periodic Inspection of Underground Storage Tanks (see sections on FRP tanks).
  • FTPI T-95-02
    • Complies with Fiberglass Tank and Pipe Institute’s Recommended Practice.
    • Remanufacturing of Fiberglass Reinforced Plastic (FRP) Underground Storage Tanks (including Change of Contents Section 6) .
  • UL 1316
    • Utilizes materials currently listed for the storage of petroleum products, alcohol’s and alcohol gasoline mixtures in Underwriters Laboratories  Standard.
    • Glass-Fiber-Reinforced Plastic Underground Tanks for Petroleum Products, Alcohols, and Alcohol-Gasoline Mixtures.
  • ASTM D 6751
    • Compatible with BioDiesel as defined by the American Society for Testing and Materials Standard.
    • Specification for Biodiesel Fuel Blend Stock (B100) for Middle Distillate Fuels.
  • NLPA 631
    • Complies with National Leak Prevention Association NLPA Standard.
    • Entry, Cleaning, Interior Inspection, Repair, and Lining of Underground Tanks.



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