Process for cleaning nitric acid absorption column coils

Details Process for cleaning nitric acid absorption column coils Process for cleaning nitric acid absorption column coils

1991-04-05

1993-05-25

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 2211, 134 2212, 15104061, B08B 904

Patent

active

052136230

ABSTRACT:
A method of cleaning a nitric acid absorption column cooling coil having an access port and an exit port comprising the steps of closing the access port, inserting a pig in an operative position within a sealable cavity of a launching assembly that is operatively attached to the access port to allow the pig to enter the coil, pressurizing the launching assembly with a fluid to a pre-determined level, opening the access port while maintaining pressure against the pig during its passage through the coil by a fluid pump sufficient to force the pig into and through the coil, and capturing the pig after it passes through the exit port.

REFERENCES:
patent: 2906650 (1959-09-01), Wheaton
patent: 3135322 (1964-06-01), Neugebauer
patent: 3531813 (1970-10-01), Hurst
patent: 3879790 (1975-04-01), Girard
patent: 4016620 (1977-04-01), Powers
patent: 4554965 (1985-11-01), Bochinski et al.
patent: 4720884 (1988-01-01), Ralls
patent: 4724007 (1988-02-01), Barry et al.
patent: 4825498 (1989-05-01), Rankin
patent: 4846259 (1989-07-01), Fujimoto et al

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