Method and apparatus for removing paraffin from a fouled pipelin

Details Method and apparatus for removing paraffin from a fouled pipelin Method and apparatus for removing paraffin from a fouled pipelin

1990-05-21

1991-07-16

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

15104061, 15104062, B08B 904

Patent

active

050321854

ABSTRACT:
The present disclosure sets forth a method of pigging a paraffin coated pipeline. It is scrubbed to dislodge a paraffin coating by sequentially passing through the pipeline subject to flowing oil pressure a sequence of pigs. The first pig has an elongate cylindrical body formed of very light foam of open cell construction, typically polyurethane, and subsequent pigs are formed of the same external pig body. In sequence, the pigs are provided with increasingly large central cores formed of a heavier foam so that the first central core has a diameter of about ten percent of diameter and the last approaches about seventy, but not one hundred percent of the diameter.

REFERENCES:
patent: 3277508 (1966-10-01), Knapp
patent: 4083076 (1978-04-01), Girard

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