Hollow plug for blocking a heat exchanger tube

Details Hollow plug for blocking a heat exchanger tube Hollow plug for blocking a heat exchanger tube

1989-12-11

1991-06-11

Bryant, III, James E.

Pipes and tubular conduits

With closures and plugs

Inflation stem type

165 71, 376203, 376451, F16L 5500

Patent

active

050224379

ABSTRACT:
A hollow plug for blocking a heat exchanger tube includes an expansion zone expanded into a frictional connection with the heat exchanger tube. An outer surface in the expansion zone has a first part with a relatively greater surface hardness and a second part with a relatively lesser surface hardness. The first part has a greater surface hardness than the heat exchanger tube. The second part has a lesser surface hardness than the heat exchanger tube. The first part also has a relief pattern.

REFERENCES:
patent: 1886419 (1932-11-01), Oberhuber
patent: 3201158 (1965-08-01), Meripol
patent: 3942560 (1976-03-01), Deaver
patent: 4591068 (1986-05-01), Tolino et al.
patent: 4598738 (1986-07-01), Weber et al.
patent: 4771810 (1988-09-01), Ermold et al.

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