Tank lining system

A tank lining system which comprises:

• a tank having a wall defining an opening;
• a sheet lining adhering to the interior surface of said wall and defining an opening that is aligned with the opening defined by the tank wall;
• a penetration fitting having a periphery that is similar in configuration to said opening and extending into the interior of the tank through said opening, said fitting having an outer surface, an end surface, and an inner surface;
• a collar having a flange surrounding the periphery of said opening, a first wall surrounding said penetration fitting outer surface and extending towards the tank interior and generally perpendicular to said flange, and a second wall overlying said end surface and extending generally perpendicular to said first wall towards the center of said opening, said collar having a generally Z-shaped cross-sectional configuration;
• means connecting said collar flange to the plastic sheet adjacent its opening;
• and
• said first wall and said second wall of the collar being located in tight conformance with the outer surface and end surface respectively, of the penetration fitting, whereby a tight fit is provided between the plastic lining and the penetration fitting.