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Picture for Condition Assessment of 66 kV Underground Transmission Lines in Concrete Vaults

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Condition Assessment of 66 kV Underground Transmission Lines in Concrete Vaults

Product Number: 51324-20826-SG

Author: Anil Kumar Chikkam; Aaron Ulmer; Nathan Pace; Mehrooz Zamanzadeh

Publication Date: 2024

$40.00

This paper focuses on assessing the condition of steel pipe cable sections within concrete vaults, serving as protective covers for conductors transmitting up to 66,000 volts. To prevent internal corrosion and short circuits, these cables are filled with pressurized oil. However, water accumulation during storms frequently submerges the cables in water in the concrete vaults, presenting significant challenges for external corrosion protection. Through condition assessment, it was determined that the coating on the 6-5/8" (16.8 cm) diameter steel carrier pipe remained in satisfactory condition. However, the coating on the 14" (35.56 cm) diameter steel casing exhibited poor condition and no longer provided adequate corrosion protection. This paper investigates the underlying causes of premature coating failure and proposes a recommended coating system considering the elevated temperatures experienced by the pipe cables. The findings contribute to enhancing the durability and effectiveness of coatings for submerged steel pipe cables, addressing the challenges posed by water submersion and ensuring long-term corrosion protection. Also, we discuss the temperature and corrosion monitoring by wireless Sensor.

Picture for Inspection and Mitigation of Corrosion for Pipe Cable Systems

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Inspection and Mitigation of Corrosion for Pipe Cable Systems

Product Number: 51321-16434-SG

Author: Frank Rea

Publication Date: 2021

$20.00

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