STEAM GENERATOR SLUDGE LANCE APPARATUS

摘要

A sludge lance for a tube and shell steam generator that has a central divider plate that extends substantially the length of a central tube lane substantially bisecting a hand hole through which the tube lane can be accessed. The sludge lance has a nozzle with a spring biased, reciprocally movable plunger that extends against the divider plate and is locked in position by a stream of high pressure cleaning fluid that traverses the nozzle and exits through jets to clean sludge from between the tubes. An alignment tool with a swing arm indexes the jets to assure they are properly aligned with the tube rows and spaced from the divider plate.

主权项

1. A sludge lance for use in a steam generator having a shell enclosing a tube sheet and a plurality of substantially uniformly diametrically sized tubes extending from the tube sheet with the tubes disposed in a substantially regular pattern having substantially uniform narrow gaps between adjacent tubes, the regular pattern forming a generally central lane along which a divider plate extends along approximately the center of the center lane and the shell having at least one access opening in-line with the central lane, the sludge lance comprising:
a mounting assembly structured to support a drive assembly and a rail; the drive assembly structured to move the rail along the central tube lane on one side of the divider plate between the tubes and the divider plate; a nozzle assembly having a body assembly, the nozzle assembly body assembly defining a fluid passage and sized to pass between the tubes and the divider plate, the nozzle assembly being coupled to the rail; and a plunger reciprocally moveable in a cavity in the nozzle body assembly and biased in a direction to contact the divider plate when positioned in the center lane.