LANCE FOR CLEANING THE SHELL SIDE OF A HEAT EXCHANGER CORE

摘要

A handheld lance is disclosed for high pressure jetting of tubes of a heat exchanger core. The lance 50 comprises a fluid conduit defining an internal plenum chamber having at least one nozzle 62 for emitting a jet of fluid for cleaning the outer surfaces of the tubes of the core and a coupling 56 for connecting the plenum chamber to a high pressure fluid supply line. In the invention, the lance 50 has a thickness sufficiently small to permit the conduit to fit between the tubes of the heat exchanger core and a width significantly greater than the thickness to increase the stiffness of the conduit in the plane normal to its thickness.