NDLI: Analyzing the Crash Between Gauging Pig and the Elbows of U-Shaped Pipeline

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Li, Daquan Zhang, Peng Ai, Muyang Zheng, Jianguo Yan, Feng Wang, Yubin
Copyright Year	2012
Abstract	Gauge pigging runs are performed to detect restrictions, dents and other deformations within pipelines. After a gauge tool is run, the gauge plate is examined to see if there are any impressions or damage on the plate which would indicate deformation or restrictions within the pipeline. It is important to note however, that in the process of the gauge pig traveling through the pipeline, collisions can occurs at locations where no deformations are present. Such locations can include pipeline elbows. Therefore, precautions in both the pig design as well as in the pipeline operation should be taken to prevent this from happening. For example, a U-shaped pipeline is often designed, with a series of 90° elbows, for pipeline river crossings. When a gauge pig passes through such elbows, the plate may incur damage if the pig velocity is too high or the pig’s design is inadequate. This can lead to erroneous judgment calls with regard to the presence of deformations within the pipeline. This paper describes the analysis performed on the motion of a gauge pig as it passes through the elbows of a U-shaped pipeline segment. And the geometric properties of elbow and caliper pig have been analyzed too. It is concluded that if the velocity of the pig exceeds a specific threshold value, the centrifugal force of the pig as it travels through the elbow becomes large enough such that the supporting disks will yield and allow plate damage to occur. If the front support plates of the pig are deformed enough, the plate will collide with the outside arc of the elbow. A variety of factors, described in this paper, determine this critical pig velocity threshold value. Additionally, it is concluded that the plate can be damaged at the inside arc of the bend if specific geometric relationships exist between the gauge plate, pig and the bend itself. Based on these conclusions, required modifications to both pig designs, as well as to pipeline velocity can be determined in order to avoid damaging gauge plates at pipeline elbows.
Sponsorship	International Petroleum Technology Institute Pipeline Division
Starting Page	453
Ending Page	457
Page Count	5
File Format	PDF
ISBN	9780791845127
DOI	10.1115/IPC2012-90077
Volume Number	Volume 1: Upstream Pipelines; Project Management; Design and Construction; Environment; Facilities Integrity Management; Operations and Maintenance; Pipeline Automation and Measurement
Conference Proceedings	2012 9th International Pipeline Conference
Language	English
Publisher Date	2012-09-24
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Gauging plate U-shaped pipeline Caliper pig Crash Bend Pipeline Pipelines
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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