Seismic protection system for a clarifier feedwell in a wastewater treatment system

摘要

A clarifier feedwell having a seismic protection system. The clarifier feedwell includes a feedwell frame and at least one pressure relief door which is slidably inserted into the feedwell frame. The pressure relief door includes a supporting frame, the supporting frame defining an opening. A flexible panel is disposed in the opening. A first edge of the panel is attached to a first portion of the supporting frame. The remaining edges of the panel are releasably engaged with other portions of the supporting frame such that the panel occupies substantially the entire area of the opening. At least one stiffening frame is disposed on the panel. The stiffening frame increases the rigidity of the panel, so that the panel does not disengage from portions of the supporting frame under a normal hydrodynamic load. However, under a sudden high magnitude hydrodynamic load, the flexible panel disengages from selected portions of the supporting frame, allowing water to pass through the clarifier feedwell without damaging it.