EP 0422266 B1 19930421 - IMPROVED PRESSURE PULSE CLEANING METHOD
Title (en)
IMPROVED PRESSURE PULSE CLEANING METHOD
Publication
Application
Priority
EP 89118848 A 19891011
Abstract (en)
[origin: EP0422266A1] Apparatus for loosening and removing sludge and other impurities from the interior of a heat exchanger vessel (5) which may be the secondary side (5) of a nuclear steam generator (1). The apparatus generally comprises a nozzle (111) having a first end that is detachably mountable into an access opening (53a, 53b) such as a sludge lance port (53a, 53b) in the secondary side of the generator, and a second end that extends into the interior of the secondary side (5) at a downward angle relative to the tubesheet (7) in the vessel (5) for minimizing the stresses applied to the heat exchanger tubes (22), and for uniformly reflecting the pulse back up toward the upper portions of the secondary side (5). The apparatus preferably further comprises a recirculation system (114) for purifying the water within the generator (1) while a pulse generator (60a, 60b) emits a succession of sludge and debris loosening pulses therein. An array of inlet and suction tubes (121a, 121b) are further provided so that the sludge and debris may be removed.
IPC 1-7
IPC 8 full level
F22B 37/48 (2006.01); F28G 7/00 (2006.01)
CPC (source: EP)
F22B 37/483 (2013.01); F28G 7/00 (2013.01)
Designated contracting state (EPC)
DE
DOCDB simple family (publication)
EP 0422266 A1 19910417; EP 0422266 B1 19930421; DE 68906157 D1 19930527; DE 68906157 T2 19931104
DOCDB simple family (application)
EP 89118848 A 19891011; DE 68906157 T 19891011