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A decision support tool for best coating selection during trenchless pipe installation

Picture for A decision support tool for best coating selection during trenchless pipe installation
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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.

Product Number: 51323-18849-SG
Author: Thierry Kerzerho, Pascal Aussant, Eric Parizot, Ahmed Fakhry, Alexandre Royer
Publication Date: 2023
$0.00
$20.00
$20.00

GRTgaz operates over 30 000 km of gas pipelines in France. The majority of these pipelines have been laid in trenches, however, when crossing a river, a highway or a railway, contractors are required to use trenchless technology such as Micro-tunneling, HDD or Direct Pipe.
Due to intensive pipe/soil interactions which exist, when utilizing these techniques, the coating can become damaged. Thus, to offset this damage, GRTgaz has developed its own decision support software to provide guidance in designing the appropriate coating thickness for trenchless pipe installations.
Based on an extensive description of the crossing profile, pipeline characteristics and soil properties, the tool has the ability to output maximum pulling load and stress during installation, hydrotest and operations.
It can also assist in choosing the best possible coating material by providing a risk estimation for each failure mode associated with a trenchless installation.
This paper will provide actual examples from the field and explain the calculation process behind the tool.

GRTgaz operates over 30 000 km of gas pipelines in France. The majority of these pipelines have been laid in trenches, however, when crossing a river, a highway or a railway, contractors are required to use trenchless technology such as Micro-tunneling, HDD or Direct Pipe.
Due to intensive pipe/soil interactions which exist, when utilizing these techniques, the coating can become damaged. Thus, to offset this damage, GRTgaz has developed its own decision support software to provide guidance in designing the appropriate coating thickness for trenchless pipe installations.
Based on an extensive description of the crossing profile, pipeline characteristics and soil properties, the tool has the ability to output maximum pulling load and stress during installation, hydrotest and operations.
It can also assist in choosing the best possible coating material by providing a risk estimation for each failure mode associated with a trenchless installation.
This paper will provide actual examples from the field and explain the calculation process behind the tool.

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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.
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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).
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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).
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