Abstract: A burn chamber for a recirculating system for remediation of contaminated soil, the burn chamber including a burn chamber housing, the housing having an inlet (152) and an opposing outlet (164). Contaminate-containing vapors moving into the interior of the burn chamber through the inlet (152) are directed through grill members (170 and 172) into flame areas produced by burners (174 and 176), with the vapors then being circulated by a baffle member (198) positioned near the front of the chamber housing and then through grill members (190 and 192), which are oriented to direct the vapors around the ends of the baffle (198) and out the outlet (164) to the remainder of the recirculating system.

Abstract: The recirculating system includes a soil stack (10), which is formed by sequential layers of contaminated soil from a site and hot air pipes (22, 26, 32, 34). A plurality of vapor collection pipes (40, 46) is laid over the top of the stack, with a sealing member (50) positioned over the entire soil stack (10) and sealed around the base thereof. First and second connecting means (99, 102) connect the hot air pipes and the vapor collection pipes to a heating/vapor destruction system (52), which includes a burn chamber (54), a first air duct (91) extending from the outlet of the burn chamber (54) to a first blower (93), a second air duct (97) extending from the first blower (93) to the first connecting means (99), a third air duct extending from the second connecting means (102) to a second blower (110), and a fourth air duct which extends from the second blower (110) to the inlet (58) of the burn chamber (54).

Abstract: A pipe straightening tool that includes an operating unit that can be inserted forwardly in a pipe as far as needed by use of detachable handle extensions. The unit includes an elongated lower segment and a parallel upper segment thereabove having a nose segment pivoted at its forward end for movement of the forward tapered end of the nose segment toward and away from the tapered forward end of the lower segment. The upper unit is movable toward and away from the lower segment on operation of a pair of connecting toggle linkages having a common actuator. A hydraulic cylinder unit is disposed between and connected to the actuator and another toggle linkage connecting the lower and nose segments so that extension of hydraulic cylinder unit concurrently urges upward movement of both the upper segment and the nose segment. All the segments present outwardly facing surfaces that are conformable to cylindrical surfaces. Boots can be attached to the segments to increase the effectiveness of the tool for larger pipe.