10058 Weather-Outside Force Threat Lightning to Pipelines and Coatings

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Product Number: 51300-10058-SG

ISBN: 10058 2010 CP

Author: Joseph Pikas and William Shoaf

Publication Date: 2010

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Pipeline Hazardous Material Safety Administration (PHMSA) regulators require that pipelines with external coatings for which the threat of weather related conditions such as lightning can be assessed by External Corrosion Direct Assessment (ECDA), In Line Inspection (ILI), hydrostatic testing, or other methods to assure integrity of the pipeline system. Removing this particular threat of outside force by lightning is required but seldom accomplished. However, this threat which requires the need for sufficient historical data on number or density of lightning strikes, condition of coating, distance from AC tower grounding, pipe investigations, etc. is justified where damage is anticipated or has occurred. Therefore, a need is required for an auditable and systematic process by which the threat of lightning can be assessed adequately. This paper describes an approach to monitor, integrate outside data and analyze this information in order to identify whether outside force damage by lightning is a threat for a transmission pipeline.

KEYWORDS: Outside Forces, Lightning, External Corrosion Direct Assessment, In-Line Inspection, Conductance, AC Corrosion, Guided Wave Testing, Coating Scan, Direct Current Voltage Gradient