EXPERIMENTAL INVESTIGATION ON REPAIRING OF STEEL PIPES USING COMPOSITE MATERIALS: PART II

Zamzam A. Alshrif; Ramadan O. Saied; T. Abujelala; E.I. Elarbi

doi:10.66411/jer.v11i.180

Authors

Zamzam A. Alshrif Mechanical Engineering Department Faculty of Engineering, University of Garyounis Author
Ramadan O. Saied Mechanical Engineering Department Faculty of Engineering, University of Garyounis Author
T. Abujelala Mechanical Engineering Department Faculty of Engineering, University of Garyounis Author
M. I.Elarbi Mechanical Engineering Department Faculty of Engineering, University of Garyounis Author

DOI:

https://doi.org/10.66411/jer.v11i.180

Keywords:

Composite, Steel pipe, Stress and strain, Failure mode, Rehabilitation, Blister pressure, Clamp, Quasi- Laminate, Matrix cracking, Delamination

Abstract

This Paper presents an experimental study of composite materials for the rehabilitation of steel pipes. Three specimens, of 83 mm internal diameter, 12.5 wall thickness and 900 mm length, were cut from new carbon steel pipes with ASTM specification (SA-106). In each specimen a hole was drilled at its mid length to simulate the corrosion defect. The diameters of the holes were chosen as 10, 15, and 20 mm. The composite repair materials were fiber glass woven roving (type E) and polyester resin. Bolted steel clamps were used to clamp the composite repairs around the pipes at the defect holes to minimize the delamination effect and stop the leakage of water during the tests of the pipes. A special rig was designed to carry out pressurized tests on the repaired pipes. It was concluded that the maximum pressure obtained was 200 bar for the pipe with 10 mm defect hole. The microscopic examination showed that matrix cracking and delamination were the dominant failure mode in the most of failed pipes.

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