Many composite access covers look similar, yet perform incomparably, some leaking or even breaking after cyclical loading.
According to Fibrelite, like any highly engineered product, the cleverness is hidden inside. It explains that the simplest way to measure this is by level of deflection. And in using this method, Fibrelite explains that it has tested its, and a competitor’s, cover.
Fibrelite claims that excessive deflection indicates a lack of stiffness and potentially leads to fatigue and premature failure in manhole covers. Repeated deflection beyond the elastic limit results in permanent deformation. Permanent deformation presents safety issues with rain water pooling on the manhole cover, the cover no longer seating correctly within the frame and ultimately failure.
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