Underground Petroleum Tank Lining
AmTech crews have repaired and lined thousands of single and double walled steel, fiberglass and poly wrap underground tanks used to store petroleum and petrochemical products. Permeations between the primary containment and the outer wall are completely reversible, adding many years of in service life to a problem tank.
In the 1960s, major oil companies like Esso / Exxon, Mobil, Shell and Arco started using tank lining to extend the useful life of their in service steel underground storage tanks. In the later 1980s and into the later 1990s major oil refiners and oil distributors across the United States called on the tank lining professionals at AmTech to help meet the requirements of the USEPA and state environmental agencies for UST corrosion protection using quality AmTech® and Armor Shield® tank lining systems.
Today AmTech offers cutting edge systems and materials like Armor Shield TL300, TL300M, TL900, TL1000, AmTech BiFlex and BiFlex HD and our new DK2 for the repair, rejuvenation and lining of single and double wall USTs. This work, performed while the tank is in the ground, allows rapid return to service and minimum disruption of the business operation.
Underground Tank Repair
After excavation uncovers the tank top and liquid product is removed from the tank, the field crews perform the following procedures to repair the underground tank:
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(1) PURGING VAPOR FROM TANKUsing large amounts of compressed air, fed through an eductor purging system, the environment inside the tank is brought to safe levels, allowing crew entry. |
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(2) TANK ACCESS OPENINGIf a tank does not have a factory installed manway, the AmTech technicians will cut open the storage tank for interior access. |
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(3) DESLUDGING TANKThe tank is cleaned of all sludge and liquids. DOT approved barrels are used to store the removed waste materials. |
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(4) TANK ABRASIVE BLASTINGThe tank then receives an abrasive blast to prepare the surface and create a 4 to 4.5 mil profile. |
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(5) TANK INSPECTIONThe interior tank shell is then tested for weak or permeated areas using methods from such national standards as API 1631 and NLPA 631. |
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(6) TANK REPAIRAny weak or permeated areas detected during inspection of the tank which fall within allowable repair criteria for the tank are repaired in accordance with the accepted industry practices. |
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(7) TANK COATINGThe entire tank interior is then spray coated with one of our Armor Shield systems to defer future corrosion and reduce sludge build-up. |
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(8) TANK LINING TESTING AND QUALITY CONTROLTesting is conducted on the new interior tank lining using methods to insure uniform thickness, material hardness and absolute coverage. 
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(9) SEALING ACCESS OPENING TO TANKOnce the tank interior work is completed, the access opening to the tank is sealed with overlapping plates or a manway, with bolted removable cover, is welded in place. |
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For further information on underground and aboveground petroleum tank lining, contact our Customer Service Engineers or call toll-free: 888-839-0373