Liners are clay, cast concrete or metal conduits that are installed in a chimney to contain the fire and direct it upward.

Newark's system, in which the cables are each encased in separate plastic ducts inside a concrete conduit 2.5 feet wide by 4 feet deep, was installed in the late 1960's.

This beam, he said, scraped the outside of the concrete conduit.

Scanning for Many Objects Acoustic detectors could also prove useful in locating underground pipes made of plastic, concrete conduits, archeological relics and other non-metallic objects, scientists say.

A pile driver employed by one company, Linde-Griffith, severed the cables by driving two 60-foot steel beams through a buried four-foot-deep concrete conduit that skirts the edge of the Hertz construction site.

They reached a flame pit, a mighty concrete conduit dug into the desert alongside the test rig.

The spillway is a rectangular concrete conduit through the dam with an uncontrolled overflow crest.

In those days the shifting river channels had not been turned into concrete conduits, and there were no flood basins to contain the waters that poured down through the washes and arroyos.

The uncontrolled morning-glory spillway in the left abutment consists of a concrete intake structure, concrete conduit, and concrete chute and stilling basin.

Today, part of the creek that flows through Downtown is underground, enclosed by a concrete conduit.