A.S.M.E. DOMESTIC PDG TANKS
ABOVE GROUND / ABOVE GROUND-UNDERGROUND / UNDERGROUND
VACUUM PURGED 100% REGO VALVES - UL LISTED
POWDER-COAT FINISH

Thompson's exclusive T-UG system delivers proven corrosion protection, longer, safer service life, and lower installation costs.

T-UG tanks offer specialized dielectric protective coating and cathodic protection

Thompson's T-UG tanks are the first underground LPG pressure vessels specifically designed by certified corrosion engineers. These superior LPG storage tanks are coated with 15 mils of coal tar epoxy -- 3 times the protection of competing products. They also offer built-in cathodic protection designed to meet the same safety standards demanded in buried water lines and underground gasoline tanks.

Click To Enlarge Photo

Corrosion Control

Thompson's T-UG Tanks combine the three basic principles of underground corrosion control.

• Cathodic protection is assured through the use of anodes.
• Electrical isolation of the tank from other underground metallic structures is achieved by use of non-conductive dielectric unions (provided by installer).
• Specialized dielectric coating, capable of withstanding corrosive underground environments, is applied at the factory to provide a barrier between the metal surface and the soil.

Coating is another process that we subject to intensive quality control testing. Each tank is put through a comprehensive inspection for complete quality assurance. Upon satisfactory completion of this inspection, the tank surface is prepared and coated for protection. Thompson applies 15 mils of coal tar epoxy for all underground tanks. After the coating has cured, it is inspected and approved for underground installation.

Installation Procedure*

1. The site should be excavated deep enough to enable one foot of compacted clean sand or gravel to act as bedding material between native soil and the tank when anchoring is not required. Burial depths must meet minimum code requirements.
2. The tank must be visually inspected for any coating damage prior to installation. Any damage must be repaired.
3. The tank must be purged or vacuum-tested and any local or state testing requirements performed.
4. Any applicable anchoring should be applied to the tank (such as buoyant restraints in high-water table areas). The tank must be electrically isolated from any hold-down straps.
5. The anode(s) must be attached to the tank.
6. Homogenous backfill consisting of pea gravel, #8 crushed stone, clean sand or natural earthen materials should be used. The backfill must be placed along sides of the tank to ensure full support along the tank's bottom quadrant.
7. The tank must be electrically isolated from the house/structure and any buried piping.
8. The tank electrical voltage potential test must be performed after installation and then at least once a year. This procdure verified the effectiveness of the cathodic protection system.