Large centrifugally-molded polyethylene tank for underground storage of diverse materials, includes water, waste water and fuels, has defined system of reinforcing ridges

摘要

The tank includes a horizontal peripheral belt interrupting ridges at its level (see illustration). An Independent claim is included for the method of fabrication in which two mold halves are assembled at a parting plane perpendicular to the ridges at the greatest width and located at the level of the peripheral belt.