Machine Design

Rotomolded plastic replaces concrete

A Netting TrashTrap system from Fresh Creek Technologies Inc., Cedar Grove, N.J., captures floating trash and debris before they disrupt sewer systems or pollute waterways.

But the company knew its large concrete system would be too costly and cumbersome for the low- flow (1 to 5-cfs) stormwater market. To make it lighter, the company worked with the plastics design and manufacturing firm Meese Orbitron Dunne Co., Madison, Ind.

MOD engineers designed a rotationally molded alternative using advanced 3D modeling that eliminates the weighty concrete vault and cover, and stainless-steel doors. The housing for the Trashmaster Net Capture System is a single rotationally molded part made from durable high-density polyethylene (HDPE), with a manhole cover for access. The housing costs about half as much, is one-fourth the weight, and installs in a day with on-site equipment, compared to a week for its concrete counterpart. The plastic part fits pipe up to 24 in. diameter and installs to a depth up to 10 ft.

To help speed installation, Meese Orbitron Dunne Co. preassembles the Trashmaster Net Capture System with custom-engineered pipe couplings, framing, and other internals. It then ships the rotationally molded unit directly to the job site.

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