SGS Tests Steel Wire Ropes of the Longest Sea Link Bridge using Magnetic Flux Leakage

Shanghai, China (PressExposure) August 11, 2009 -- The Bandra-Worli Sea Link (BWSL) ( is the first and longest sea link bridge in India, connecting Bandra and the western suburbs of Mumbai with Worli and central Mumbai. It was opened on June 30, after 10 years of construction time and approximately $400 million in investment costs.

The BWSL is an 8-lane cable-stayed bridge, spanning about 600 meters in length and towering to a height of 126 meters, equivalent to the height of a 43-story building. The cable stay system is comprised of 2,250 km of high-strength galvanized steel wires which support the cable stay bridge weighing 20,000 tons.

The construction of the Bandra-Worli Sea Link is an engineering marvel and the first ever open sea bridge of its kind. Materials used in the construction project have to meet quality regulations and standards. The quality and reliability of steel wire ropes is crucial to the safe construction and maintenance of a cable-stayed bridge.

In May 2008, Hindustan Construction Company (HCC), the constructor of the Bandra-Worli Sea Link, awarded SGS Industrial Services China the contract for steel wire rope inspection and documentation review. SGS China performed the inspection of the steel wire ropes during the manufacturing process. Forged anchor cups and nuts were checked by using the Magnetic Flux Leakage method.

Magnetic Flux Leakage (MFL) ([]) is a Non-Destructive Testing method used to detect flaws, corrosion and pitting on the surface and sub-surface of steel structures. The basic principle of this Non-Destructive Testing (NDT) method is that a strong magnet induces a magnetic field in the material, and in areas with imperfections, such as corrosion or missing metal, a leakage field will arise and thus bad spots can easily be identified and repaired.

SGS Industrial Services is a global service provider for technical verification, inspection, testing and conformity assessment and in-service inspection. SGS Industrial Services effectively instills confidence in clients by ensuring that their installations, materials, equipment, facilities and projects meet all quality and performance requirements.


Thomas Wang SGS Industrial Services SGS-CSTC Standards Technical Services Co., Ltd. 4/F No. 3 Building, 889 Yishan Road Shanghai, 200233, P.R.China

t: +86-21-6115 6800 f: +86-21-6495 2392

About SGS Industrial Services

The SGS Group is the global leader and innovator in inspection, verification, testing and certification services. Founded in 1878, SGS is recognized as the global benchmark in quality and integrity. With more than 56,000 employees, SGS operates a network of over 1,000 offices and laboratories around the world.

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Press Release Submitted On: August 11, 2009 at 6:52 am
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