Abstract: The invention provides a leak detection system comprising a conduit for carrying a fluid or gas and a control device for monitoring leaks in the conduit. The conduit is formed from first and second electrically conductive layers that are electrically insulated from each other. The control device includes an output, for introducing an electric charge to the first and second layers, a detector for detecting changes in the electric charge introduced to layers, and a response switch for triggering a predetermined response when a sufficient change in the electric charge is detected.

Abstract: The invention provides a leak detection system comprising a conduit for carrying a fluid or gas and a control device for monitoring leaks in the conduit. The conduit is formed from first and second electrically conductive layers that are electrically insulated from each other. The control device includes an output, for introducing an electric charge to the first and second layers, a detector for detecting changes in the electric charge introduced to layers, and a response switch for triggering a predetermined response when a sufficient change in the electric charge is detected.

Abstract: The invention is directed to a piping system for a side wall vented mid-efficiency furnace. The piping system comprises a plurality of sections of steel pipe having a glass coated interior surface. The interior surface is continuous and resistant to corrosion. An electronic testing apparatus and a method for utilizing same in testing for flaws in the glass coating of pipes is also provided.

Abstract: A pier and beam bridge structure is formed essentially entirely from steel reinforced, precast concrete elements including elongated, hollow tubular pier members, pier collars, pier base and cap beams, deck beams, deck slabs and side railing members. In forming the support pier structures, the pier members are inserted into dry-drilled pier base excavations through opposite end openings formed in the ground-supported base beams, and are outwardly circumscribed by the collars which are received at their opposite ends in the base beam end openings and openings in the cap beams which are supported at the upper pier ends. A loose aggregate material is dumped into the pier member interiors, and the annular collar and excavation spaces surrounding the pier members. Polymer concrete is then forced downwardly through the pier member interiors, and upwardly through these annular spaces, and cures in a matter of minutes to complete the fabrication of each pier structure.