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Title: Case study: lessons learned during the in-line inspection of a pipeline containing bell-and-spigot joints, chill rings, and miter bends
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3417
Date of Publication: Feb 1 2005 12:00AM
Price: $25.00 US
Authors: Frank A Dauby Jr and Eric C Quick
Abstract: A natural gas transmission pipeline owner recently concluded the in-line inspection of a line located in Contra Costa and Alameda Counties, California. The pipeline is approximately 25.7 miles of 24 inch O.D., with wall thickness of 0.281 inch to 0.562 inch, API5L, Grades B, X42, X52, and X60. The pipeline was originally constructed in 1944 from random mill lengths and was field welded using shielded metal arc welding and has an MAOP of 500 psig (1). This pipeline contains many appurtenances such as miter bends, chill rings and bell and spigot joints installed during its original construction as well as 1.5D radius forged elbows installed in recent decades. These fixtures along with the fact that the pipeline operated at low pressures and volumes caused the in-line inspection of this line to be challenging. This case study will discuss the methods used and lessons learned throughout a three-year effort to upgrade, traverse and inspect this pipeline with an in-line inspection tool.
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