Archive for the Article Category

Investigation of Interior Corrosion of Above-Ground Storage Tanks

Barry Hindin, PhD, PE Senior Principal Engineer Kiefner and Associates, Inc.   The Failure Analysis and Welding (FAW) group at Kiefner traditionally investigates the causes of failures of buried pipelines carrying various petroleum products ranging from crude oil, refined liquid products, natural gas and its condensates. However, […]
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Geo-hazard Monitoring of Pipelines using Strain Gauges

Benjamin Zand, PhD, PE Principal Engineer Kiefner and Associates, Inc.   Introduction Pipelines are sometimes subjected to various geo-hazards such as long wall mining subsidence and slope movement.  A commonly practiced method to reduce stress in such situations is to expose the affected portion of a pipeline. […]
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Selective Seam Weld Corrosion – How Big is the Problem?

Michael Uloko, BSc, MSc Senior Engineer II (Pipeline) Kiefner and Associates, Inc.   What Is Selective Seam Weld Corrosion Selective seam weld corrosion (SSWC) is a type of corrosion that affects the bondline region and heat affected zone (HAZ) of the longitudinal seam of a pipeline forming […]
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Stress Assessment of Buried Pipes under Road Crossings or Construction Sites

Fan Zhang, PhD Principal Engineer Kiefner and Associates, Inc.   Introduction All buried pipes experience loading from the weight of soil overburden. When pipelines cross railroads, roads, parking lots or construction sites, the pipes also experience live surface loading from vehicles on the ground, including heavy construction […]
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Pressure Reversals: How to Identify and Understand the Potential Implication to Pipeline Integrity

Cara Macrory-Dalton, PE Senior Engineer II Kiefner and Associates, Inc.   Introduction Pressure testing of hazardous liquid and natural gas pipelines is conducted for a variety of reasons, some mandated in U.S. pipeline regulations or industry standards, and others elective. Pressure testing is one requirement for the […]
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