Non-metallic obround blanking hatch apparatus

An apparatus for holding materials comprising:

• a container including a container wall and having a non-circular container opening extending through the container wall;
• an obround container flange, having a preselected thickness, connected to the exterior of the container wall and surrounding the container opening, and the container flange having an integral spillwell;
• a non-metallic, obround access hatch, having a preselected thickness, connectable to the container flange by bolting, the non-metallic, non-cylindrical hatch having a plurality of apertures extending therethrough;
• a recirculation tube having a flange connection, the tube being extendable into the container through a first of the apertures and the tube flange connection being connectable to the access hatch by bolting;
• a pressure relief means associatable with a second of the apertures for relieving a pressure differential between the interior and the exterior of the container;
• a level indicating means associatable with a third of the apertures for indicating a fluid level in the container;
• a vacuum relief means associatable with a fourth of the apertures for relieving a negative pressure differential between the interior and the exterior of the container;
• a threaded circular primary opening defined by a fifth aperture located in the access hatch;
• a removable non-metallic circular cover threadedly associatable with the threaded primary opening;
• and
• primary cover locking means for securing the removable cover in a closed position.