Singapore Institute of Technology
Monitoring of Atmospheric Corrosion in a Mass Rapid Transit (MRT) Tunnel.pdf (7.61 MB)

Monitoring of Atmospheric Corrosion in a Mass Rapid Transit (MRT) Tunnel

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journal contribution
posted on 2023-07-18, 03:22 authored by Suk Meng GohSuk Meng Goh, Lee Theng Tan, Hiong Yap GanHiong Yap Gan, Yong Lim FooYong Lim Foo, K. H. Goh, H. S. Lee

A study has been conducted to measure uniform corrosion due to the tunnel environment in the mass rapid transit North East Line (NEL) in Singapore. The study was aimed at investigating the corrosivity of the atmospheric environment in the NEL to enhance understanding on the maintenance of metallic components in a tunnel. The corrosivity levels at the buffer areas of ten stations along the NEL were monitored over a period of two years. The measurements were based on physical metal coupons as well as real-time monitoring systems using electrical resistance sensors. The corrosivity levels measured at different exposure sites showed differences, but were generally low and could be generally categorised as G1 according to ISA standard 71.04:2013. The reason for the low corrosivity levels was likely to be due to the relatively mild temperature and low (<60%) average relative humidity.


Research reported in this publication was supported by the Land Transport Innovation Fund of the Land Transport Authority of Singapore (LTA).


Journal/Conference/Book title

Urban Rail Transit

Publication date



  • Published

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The version of record of this article, first published in Urban Rail Transit, is available online at Publisher’s website:

Project ID

  • 6537 (R-LTA-A204-B001) A Study of Corrosive Environment in Tunnels and Prediction of Component Life Time

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