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Underground Tank Lining Procedures

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.

1. PURGE VAPOR FROM 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.

2. TANK ACCESS OPENING

If a tank does not have a factory installed manway, the AmTech technicians will cut open the storage tank for interior access.

3. DESLUDGING TANK

The tank is cleaned of all sludge and liquids. DOT approved barrels are used to store the removed waste materials

4. TANK ABRASIVE BLASTING

The tank then receives an abrasive blast to prepare the surface and create a 4 to 4.5 mil profile.

5. TANK INSPECTION

The interior tank shell is then tested for weak or permeated areas using methods from such national standards as API 1631 and NLPA 631.

6. TANK REPAIR

Any 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.

7. TANK COATING

The entire tank interior is then spray coated with one of our Poly Lining Systems to defer future corrosion and reduce sludge build-up.

8. TANK LINING TESTING AND QUALITY CONTROL

Testing is conducted on the new interior tank lining using methods to insure uniform thickness, material hardness and absolute coverage.

9. SEALING ACCESS OPENING TO TANK

Once 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 bolted and welded in place.

   
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