Pumps – Processes
Patent
1976-12-06
1978-04-25
Freeh, William L.
Pumps
Processes
417437, 92 865, F01B 3100, F04B 3900
Patent
active
040860299
ABSTRACT:
A method and apparatus for flushing the plunger of a positive displacement pump which handles a suspension of abrasive particles. Flush liquid is introduced at two or more locations to the packing surrounding the pump plunger. The larger volume of flush liquid is introduced in front of the packing to wash abrasive particles from the plunger in the usual manner. A smaller volume is introduced intermediate front and back sets of packing rings. Initially the back packing rings provide the seal for the plunger, but when they wear, flush liquid from between the two sets of packing rings leaks past the back packing rings to furnish an indication of the wear. The front packing rings now provide the seal, and it is known that the back packing rings should be replaced.
REFERENCES:
patent: 1647425 (1927-11-01), Wise
patent: 1943578 (1934-01-01), Bigelow et al.
patent: 1996780 (1935-04-01), Wheeler
patent: 2466025 (1949-04-01), Hanson
patent: 2678609 (1954-05-01), Ashton
patent: 3128941 (1964-04-01), Waibel
patent: 3179057 (1965-04-01), Cosner
patent: 3266435 (1966-08-01), Smith
patent: 3542374 (1970-11-01), Neilson
patent: 3749529 (1973-07-01), Cornelsen
Crane Robert M.
Redwine Fletcher H.
Freeh William L.
United States Steel Corporation
Wood Walter P.
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