Aging of Polyethylene of Raised Temperature Resistance Pipe Liner After a Four-Year Service in a Crude Oil Gathering System

Kong, Lushi; Qi, Dongtao; Li, Houbu; Ding, Nan; Ge, Pengli; Xu, Yuanming; Zhang, Chunsheng; Pan, C. T.; Fan, Xin

doi:10.1007/s11668-021-01176-w

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Kong et al 36 evaluated both performance and microstructure of a high-temperature polyethylene pressure pipeline after 4 years of service in a crude oil collect system. Polyethylene-Raised Temperature (PE-RT) material is an example of solutions to difficulties related to heat, chemical resistance, and SCG in industrial applications as the polymer molecular architecture is constructed in such a way to provide an adequate number of permanent tie-molecules, allowing safe functioning of HDPE at higher temperatures.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Alimi,

Chaoui

2024

Journal of Elastomers & Plastics

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High Density Polyethylene (HDPE) is one attractive technical option for the transportation and distribution of natural gas and hydrocarbons given the advantages in long-term mechanical strength, lifespan, maintenance costs and resistance to chemical aging. This study investigates the compatibility of extruded pipe material from copolymerized HDPE-80 with DOT 3 brake fluid. Machined standard specimens from inner (IL) and outer (OL) pipe layers are aged in commercial synthetic polyglycol-based oil for 7 days at laboratory conditions. The percent mass changes are +2.2% and +1.9% respectively for IL and OL pipe surfaces. These results are in the same range of published sorption data for other oils and fuels. Stress-strain parameters (E, σ y, σ CD, σ f, ε y, Δ ε CD, ε f) and fracture work are established and thoroughly discussed for both pipe sides. For IL, the reduction of E, σ y and ε f are respectively 28.0%, 13.9% and 22.7%, while for OL they are 22.6%, 7.7% and 25.1%. Globally, it is concluded that strength properties degradation in DOT 3 oil is more important for IL compared to OL. There is an important loss of ductility for both pipe sides. Ageing caused IL crystallinity ( Xc) to increase while OL showed inverse results probably because of frozen anti-oxidants in the outer surface layers following water quenching during extrusion. Before and after ageing, the as-received OL is found to be more resilient to oxidation than corresponding IL, as higher OIT parameters are also shown in the case of crude oil compatibility investigations. DOT 3 brake oil seem to accelerate the degradation of HDPE-80 thermal stability with a higher intensity for IL.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Alimi,

Chaoui

2024

Journal of Elastomers & Plastics

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“…HDPE pipelines are widely used in gas transmission. During the laying process, the connection between two pipelines is an important link that affects its structural integrity and lasting strength 1 . Electro-fusion connection refers to the connection method in which the electro-fusion pipe fittings and pipes are melted and combined together by an applied current.…”

Section: Introductionmentioning

confidence: 99%

Study on the detection method of HDPE electro-fusion welding defect based on X-ray technology

et al. 2023

J. Phys.: Conf. Ser.

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Electro-fusion welding is a common method for high-density polyethylene (HDPE) pipes. It has a high degree of automation and mature technology. However, during the welding process, various buried defects are easily generated. In this paper, HDPE pipes with welding defects were processed, and X-ray technology was used to detect the defects. The results show that: The X-ray detection technology is sensitive to the defects of sockets and ultralight clay-filled holes. But it is difficult to distinguish the size of the holes. Unfilled holes are partially fused during the welding process, which makes them difficult to detect. In addition, the defects of cold-welding and unscratched oxide skin cannot be detected.

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“…As one of the main transportation modes of natural gas, polyethylene pipeline transportation has been widely used [1][2][3] . The welding methods of high-density polyethylene (HDPE) pipes are electro-fusion welding and butt-fusion welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of the ultrasonic phased array on defect detection of HDPE electro-fusion joint

Lu²,

Chen³

et al. 2023

J. Phys.: Conf. Ser.

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As a common welding method for polyethylene natural gas pipelines, electro-fusion welding has been widely used. However, defects are easy to occur in the fusion area during the welding. In this paper, high-density polyethylene (HDPE) pipes with different types of electric welding joint defects are processed, and the detection effect of the ultrasonic phased array on joint defects is explored. The results show that: Ultrasonic phased array detection technology is easy to operate and reliable. It can detect three common defects: inadequate socket, cold welding, and scratch of oxide scale. In addition, according to the inspection result chart, the defect type can be accurately judged.

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Aging of Polyethylene of Raised Temperature Resistance Pipe Liner After a Four-Year Service in a Crude Oil Gathering System

Cited by 10 publications

References 22 publications

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Study on the detection method of HDPE electro-fusion welding defect based on X-ray technology

Effect of the ultrasonic phased array on defect detection of HDPE electro-fusion joint

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