AmTech crews have repaired and lined thousands of single and double walled steel, fiberglass and poly wrap underground tanks used to store oil, 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 (UST). 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®, Armor Shield® and Poly Lining System® tank lining systems.
Today AmTech offers cutting edge systems and materials like Armor Shield TL300, TL300M, TL900, TL1000, AmTech BiFlex and BiFlex HD, Poly Lining Systems 360e, 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.
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.
Using large amounts of compressed air, fed through an eductor purging system, the environment inside the tank is brought to safe levels, allowing crew entry.
If a tank does not have a factory installed manway, the AmTech technicians will cut open the storage tank for interior access.
The tank is cleaned of all sludge and liquids. DOT approved barrels are used to store the removed waste materials.
The tank then receives an abrasive blast to prepare the surface and create a 4 to 4.5 mil profile.
The interior tank shell is then tested for weak, leaking or permeated areas using methods from such national standards as API 1631 and NLPA 631.
Any weak, leaking 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.
The entire tank interior is then spray coated with one of our Armor Shield systems to defer future corrosion and reduce sludge build-up.
Testing is conducted on the new interior tank lining using methods to insure uniform thickness, material hardness and absolute coverage.
Once the tank interior work is completed, the access opening to the tank is sealed with overlapping plates or a man way, with bolted removable cover, is welded in place.