Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1980-12-08
1983-07-19
Husar, Francis S.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291574, 29413, 29414, 2940202, 29522R, 29523, 29727, 138 89, B23P 1526
Patent
active
043935648
ABSTRACT:
A shell and tube type heat exchanger having a tube bundle supported at opposite ends in tube sheets is capable of being repaired quickly by closing off opposite ends of a damaged tube using the method and apparatus disclosed. The apparatus comprises a two-part tapered plug assembly which is adapted to be installed in the tube in alignment with the tube sheet and expanded radially outward into tight engagement with the interior of a tube by pulling an inner wedge portion of the plug assembly axially relative to an outer ring portion. The pulling is effected by an hydraulic ram which is connected by a breakaway unit to a pull rod which slides axially relative to a compression tube both of which are received axially within the defective tube. The hydraulic ram pulls the rod relative to the compression tube and thereby draws the wedge inside the ring until the breakaway connection releases the pull rod and enables the pull rod, compression tube and auxiliary parts to be withdrawn from the defective tube. A shorter length of compression tube and pull rod is utilized for plugging the other end of the defective tube and for plugging U-bend types of heat exchangers.
REFERENCES:
patent: 2856963 (1958-10-01), Hoerter
patent: 3473555 (1969-10-01), Martin et al.
patent: 3691609 (1972-09-01), Ice, Jr. et al.
patent: 4091841 (1978-05-01), Beneker et al.
Elliott Hydraulic Tube Puller Bulletin Y-107.
Expando Seal Tools, Inc. Bulletin entitled "Testing and Flushing Guns".
Expando Seal Tools, Inc. Bulletin entitled "Valve Changing Tools".
Husar Francis S.
Rising V. K.
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