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Related Experiment Video

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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

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Automated Installation System for Joint Casing with Circumferential Temperature Control in District Heating Pipelines

Seungbeom Jang¹, Yuhyeong Jeong¹, Youngjin Jeon¹

¹Department of Mechanical Engineering, Hanyang University, Ansan-Si 15588, Republic of Korea.

|April 14, 2026

Summary

This study defines thermal criteria for heat-shrinkable crosslinked polyethylene (PEX) casings, ensuring proper activation and preventing damage. A new two-stage heating method improves joint bonding and consistency compared to manual torch heating.

Keywords:

DSC-defined thermal activation crosslinked polyethylene (PEX)heat-shrinkable polymer interfacial bonding thermal criteria two-stage heating sequence

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Published on: April 30, 2018

Area of Science:

Materials Science
Polymer Engineering
Thermal Analysis

Background:

Heat-shrinkable crosslinked polyethylene (PEX) casings are used for joint protection.
Accurate thermal control during installation is critical for PEX casing performance.
Existing installation methods lack precise thermal management, leading to inconsistent results.

Purpose of the Study:

To establish experimentally grounded circumferential thermal criteria for PEX joint casings.
To develop an optimized heating sequence for PEX casing installation.
To improve the reliability and performance of PEX joint installations.

Main Methods:

Differential Scanning Calorimetry (DSC) to determine thermal activation temperature.
Through-thickness thermal lag measurements under constrained irradiation.
Full-scale temperature mapping to analyze circumferential non-uniformity.
Development and testing of a two-stage heating sequence.

Main Results:

Identified PEX activation temperature at 140 °C via DSC.
Observed 10-15 °C lower outer-surface temperatures in non-irradiated areas due to geometric limitations.
Developed a two-stage heating sequence (high-power followed by soaking) to meet inner and outer surface temperature constraints.
Achieved stable interfacial bonding and cohesive failure in the mastic layer with improved repeatability and reduced strength scatter.

Conclusions:

The proposed thermal criteria and two-stage heating sequence ensure effective PEX casing activation and prevent thermal damage.
This method enhances joint bonding stability and reduces installation variability compared to manual torch heating.
The framework provides a transferable procedure for designing heating conditions in constrained field environments for heat-shrinkable polymer systems.