Crack Arrest and Structural Repair of High Strength Steel Piping by In-Situ Sleeving of Nanostructured Materials

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• Onshore Transmission Pipeline
• Fracture Analysis
• Pipeline Materials

Main Objective

The objective of Phase I is to formulate a preliminary assessment of whether Integran's knowledge of tubing repair can be applied to the large-diameter gas transmission pipe geometries and failure scenarios that are of specific interest to the DoT.

Public Abstract

This proposal describes a new application of an existing technology as a novel crack arrestor tool for high-strength pipelines. The full-encirclement crack arrestor would comprise a thin layer or "sleeve" of electrodeposited nanocrystalline material applied to the outside of the pipe either in the coating mill during fabrication or in the field during or following construction e.g. applied to localized regions known to be prone to failure, retrofitted, etc. Mill application would be performed during the coating stage, after surface preparation and before application of the mainline coating. A third option would see the nanomaterial applied as a patch to the cracked region of the pipe in order to utilize the "crack filling" characteristic of the process. In this instance, one would profit from the fact that the crack arresting layer is applied by a "wet chemistry" process that permits the deposition of high strength nanometal Into the crack opening, thereby achieving a bridging effect and minimizing the propagation of the crack. In other words, options exist for either sleeving before or immediately after initial pipe laying, or for more localized in-situ crack bridging / structural reinforcement after pipe degradation has already begun to occur.

Final Report

Final-ReportDoT Phase I DTRT57-08-C-10022

Final-ReportDoT_Phase_I__DTRT57-08-C-10022.pdf (1,855,974 bytes) [View] [Download/Save...]

Quarterly Status Reports

Integran Bimonthly Status Report1 b 17Feb08

Integran_Bimonthly_Status_Report1_b_17Feb08.pdf (93,568 bytes) [View] [Download/Save...]

Technical Reports and Documents

Technical progress report

Phase_ITechnicalBrief.doc (48,640 bytes) [View] [Download/Save...]