Method of cleaning tubular with frozen layered gelatin pig

Details Method of cleaning tubular with frozen layered gelatin pig Method of cleaning tubular with frozen layered gelatin pig

1992-07-27

1994-04-05

Breneman, R. Bruce

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 2211, B08B 904

Patent

active

053001524

ABSTRACT:
A method and gelatin pig is provided for scraping and cleaning tubulars. The gelled, cleaning pig has a body comprised of gelled material, preferably technical gelatin, which has a hardened, frozen outer layer. The pig is molded in a size sufficient for the periphery of the body to contact the interior wall of the tubular to be cleaned. The frozen outer surface of the gelatin is formed by merely exposing the outer surface of the gelatin to (1) the atmosphere if the ambient temperature is above the freezing temperature of the gelatin or (2) artifical refrigeration. In operation, the gelatin pig is inserted into and passed through the pipeline to scrap and clean same. The gelatin pig is bio-degradable which can be accelerated by adding a bio-reactive agent, e.g. yeast, to the gelatin.

REFERENCES:
patent: 4473408 (1984-09-01), Purinton, Jr.
patent: 4898197 (1990-02-01), Barry et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 11, J. Wiley & Sons, N.Y. pp. 711-715 1986.
The Theory of the Photographic Process, 3rd Edition, The MacMillan Company, N.Y. pp. 45-60 1980.

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