Liquid heaters and vaporizers – Cleaning – Blow off
Patent
1989-01-27
1991-11-19
Coe, Philip R.
Liquid heaters and vaporizers
Cleaning
Blow off
153161, 15339, 738665, 122379, 134113, 134172, 239548, 239588, 25022720, 901 44, F22B 3752
Patent
active
050657038
ABSTRACT:
A system (10) for lancing sludge deposits (12) from within a bundle (14) of vertically extending steam generator tubes (16) of a PWR steam generator secondary side assembly (18) has a flexible lance (28) mounted in a lance guide/housing transporter (30). The transporter (30) is movable along blowdown lane (20) to position end (32) of the flexible lance opposite one of the inter-tube lanes (26) so that the flexible lance (28) may be inserted along the selected inter-tube lane (26). A rigid lance guide (34) on the transporter (30) has a curved end (36) configured to turn the flexible lance (28) at a chosen angle, such as 90.degree., so that the flexible lance (28) will be fed into the selected inter-tube lane (26). The transporter has a drive (37) for advancing the flexible lance (28) through end (36) of the lance guide (34) and into the inter-tube lane (26). The flexible lance (28) includes a flexible plastic extrusion (38) with a plurality of hollow, flexible metal conduits (40) within the plastic extrusion (38) to extend lengthwise along the lance (28). The nozzle block (44) has nozzles 48, 50 and 52 so that all portions of the sludge deposits (12) adjacent to the selected inter-tube lane (26) can be reached by the flexible lance (28).
REFERENCES:
patent: 3625200 (1971-12-01), Muller
patent: 3676671 (1972-07-01), Sheldon
patent: 3911750 (1975-10-01), Prasher
patent: 4286585 (1981-09-01), Ogawa
patent: 4424769 (1984-01-01), Charamathieu et al.
patent: 4566843 (1986-01-01), Iwatsuka et al.
patent: 4638667 (1987-01-01), Zimmer et al.
patent: 4753223 (1988-06-01), Bremer
patent: 4826087 (1989-05-01), Chinery
Coe Philip R.
Electric Power Research Institute Inc.
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