Method for installing tubes in a tube sheet

Details Method for installing tubes in a tube sheet Method for installing tubes in a tube sheet

1980-07-28

1984-05-01

Husar, Francis S.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291573C, B23P 1526, B23P 1102

Patent

active

044452616

ABSTRACT:
A tube is inserted in a bore in a tube sheet, the tube having an outside diameter slightly smaller than the bore. Hydraulic pressure is applied to the tube internally to expand it radially throughout a pressure zone that extends at least up to one end of the bore. The pressure is confined between two axially spaced seals that encircle a mandrel and are engagable with the inner surface of the tube. The mandrel and seals are then shifted to relocate the pressure zone so that it does not reach the end, and increased pressure is applied to produce a firmer contact between the outside of the tube and the bore. Any crevices between the tube and the tube sheet in which corrosion would be likely to occur are thus eliminated. The invention is particularly suitable for use in connection with the heat exchangers of nuclear plants.

REFERENCES:
patent: 3977068 (1976-08-01), Krips
patent: 4069573 (1978-01-01), Rogers, Jr. et al.

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