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Novel HDD Mechanical Protection for Reduced Holidays

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Horizontal directional drills (HDD) have become an essential pipeline construction tool for crossing spans of the right of way with obstructions such as wetlands, rivers and streams, railroads, roads, businesses, and high consequence areas (HCA). This trenchless technology allows a pipeline to be installed without open cutting the ground. Prior to any construction, geological surveys with core samples are performed to determine the optimum route for the HDD (Figure 1).

Product Number: 51323-19303-SG
Author: Neil Pittman, Paul Phillips, James M. Fistler
Publication Date: 2023
$20.00
$20.00
$20.00

In many Horizontal Directional Drill (HDD) installations the height of the weld cap results in the coating on the weld being damaged by the mechanical forces of pull back. When pulling pipe through an engineered hole, all of the coating is subjected to gouge, impact, and abrasion forces, but the height of the weld cap focuses those forces so that they are particularly damaging.


In November 2020, DTE Energy ran a trial application of a novel composite outer wrap for girth weld protection on HDD. An 880 foot, 8 inch diameter pipe was pulled to a maximum depth of 10 feet under a creek in Canton, Michigan. The soil was mostly loam, mixed in with cobble. The pipe was coated with factory-applied FBE and ARO. The girth welds were coated with a two part epoxy. The composite outer wrap was applied to two girth welds connecting the pull head to the carrier pipe.


This paper discusses the results of the trial: a composite-outer-wrapped girth weld was pulled through a real-world HDD, cut out from the pipe, and then examined in a laboratory. The results from the testing show significant added protection for gouge, impact, and abrasion resistance without inhibiting the future effectiveness of cathodic protection.

In many Horizontal Directional Drill (HDD) installations the height of the weld cap results in the coating on the weld being damaged by the mechanical forces of pull back. When pulling pipe through an engineered hole, all of the coating is subjected to gouge, impact, and abrasion forces, but the height of the weld cap focuses those forces so that they are particularly damaging.


In November 2020, DTE Energy ran a trial application of a novel composite outer wrap for girth weld protection on HDD. An 880 foot, 8 inch diameter pipe was pulled to a maximum depth of 10 feet under a creek in Canton, Michigan. The soil was mostly loam, mixed in with cobble. The pipe was coated with factory-applied FBE and ARO. The girth welds were coated with a two part epoxy. The composite outer wrap was applied to two girth welds connecting the pull head to the carrier pipe.


This paper discusses the results of the trial: a composite-outer-wrapped girth weld was pulled through a real-world HDD, cut out from the pipe, and then examined in a laboratory. The results from the testing show significant added protection for gouge, impact, and abrasion resistance without inhibiting the future effectiveness of cathodic protection.

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Picture for Risk Evaluation Of Potential Coating Damage From HDD
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Risk Evaluation Of Potential Coating Damage From HDD

Product Number: 51322-17762-SG
Author: Ron Raphoon
Publication Date: 2022
$20.00

This paper will identify the potential causes of pipe coating failure, from the design angles to the soil types, to the fracture methods of rocks, and pull forces. It will present a logical method for evaluating the condition of an HDD pull prior to its installation so that the right level of coating protection may be applied. The pipelines that carry our world's energy and industrial networks are a vital lifeblood of our society. HDD’s play such an integral part in keeping all aspects of the pipeline and its construction running smoothly, the aim here it to ensure there are no hiccups along the way.
Picture for Ensuring Additional Mechanical Protection of HDD Coatings
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Ensuring Additional Mechanical Protection of HDD Coatings

Product Number: 51323-19549-SG
Author: David B. Futch, Ron Raphoon
Publication Date: 2023
$20.00

As onshore pipeline rights-of-way become more congested and urban sprawl increases, the number of horizontal directional drills (HDDs) will likely increase. HDD is a trenchless pipeline installation method that requires drilling a larger pilot hole where the mainline pipe can be subsequently pulled through the drilled hole. However, HDDs have an increased probability for coating damage, even when coated with traditional mill or field applied abrasion resistant overcoat (ARO).
Picture for A decision support tool for best coating selection during trenchless pipe installation
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A decision support tool for best coating selection during trenchless pipe installation

Product Number: 51323-18849-SG
Author: Thierry Kerzerho, Pascal Aussant, Eric Parizot, Ahmed Fakhry, Alexandre Royer
Publication Date: 2023
$20.00

In the recent years, Horizontal Directional Drilling - HDD - became a real improvement for pipeline construction when crossing obstacles such as rivers, roads or railways. For the corrosion protection of the carbon steel pipeline, a protective coating is associated with cathodic protection. But for trenchless techniques, the coating shall withstand the stresses from the installation. Several standards are used to specify corrosion protection coatings for buried pipelines but those documents do not cover the specific conditions of an HDD.
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