A Novel Strengthening Method for Damaged Pipeline under High Temperature Using Inorganic Insulation Material and Carbon Fiber Reinforced Plastic Composite Material.

Li Li,Tsai Tsai,Yang Yang

doi:10.3390/ma12213484

Li Li, Tsai Tsai + Show 1 more

Open Access

https://doi.org/10.3390/ma12213484

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Journal: Materials	Publication Date: Oct 24, 2019
Citations: 11	License type: CC BY 4.0

Affiliation: National Taipei University of Technology

Abstract

In this paper, a strengthening method for the damaged high-temperature steel pipeline using inorganic insulation material which was confined by carbon fiber reinforcement plastic (CFRP) composite materials was proposed. Two inorganic insulation materials were composed of magnesium phosphate cement (MPC) mixing with perlite and vermiculite powders, respectively. The influences of insulation material composites with various ratios of the perlite or vermiculite powder were discussed, in terms of compressive strength and thermal conductivity coefficients of inorganic insulation materials. The insulation materials confined by carbon fiber reinforced polymer jackets for enhancing the mechanical behavior were also investigated. From the experimental results, the main finding of the work was that the inorganic insulation materials added to the perlite powder represented greater insulation capability than added vermiculite ones under the condition of the same compressive strength. Different ratios of perlite inorganic insulation material cylinders with the dimension of ϕ 10 cm × 20 cm were confined by one layer and two layers of CFRP composite material. The compressive strength of the specimens increased by 258%–927% after using 1-layer CFRP composite material and increased by 480%–1541% after applying 2-layer CFRP composite material. A peak strength prediction model of insulation materials confined by CFRP was proposed, and it was found that the proposed model accurately predicted the peak strength of the inorganic insulation material cylinder. Finally, a verification test of the strengthening method for damaged high-temperature pipeline was performed to prove that the proposed strengthening method is feasible.

Highlights

The petrochemical industry has been developing for many decades
In order to decrease the impact of the thermal condition on the carbon fiber reinforcement plastic (CFRP) composite material, this study focused on the effects of the different additive with magnesium phosphate cement (MPC) on its thermal conductivity coefficient and the compressive strength of the pipelines used in the high-temperature surroundings
The compressive strength of the specimens decreased as the content vermiculite powder increased, no matter what the additive of the perlite or vermiculite powder mixed of the perlite or vermiculite powder increased, no matter what the additive of the perlite or with MPC

Summary

Introduction

The petrochemical industry has been developing for many decades. The pipelines in the petrochemical factories operate in high-temperature environments and pose a danger as deterioration led to thinning of the thickness of the pipelines. Damages to the pipeline used in a high temperature decrease its resistance for high internal pressures and caused noticeable accidents such as an explosion or severe fracture. There are many new materials and innovative methods to improve corrosion resistance and enhance thermal insulation works for pipelines, such as rock wool coated pipeline and spray coating on the surface of the pipeline. The rock wool is a thermal insulator widely used in the industry. Water intrusion into the insulation system through the interface of the metal and rock wool is inevitable

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Results

Conclusion