The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1991
Filed:
May. 21, 1990
Applicant:
Inventor:
Kenneth M Knapp, Houston, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B08B / ;
U.S. Cl.
CPC ...
134 2211 ; 15104061 ; 15104062 ;
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.