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Technology revolutionises gas pipeline checks

01 June 2009

DNV has joined with Gassco to develop an acoustic inspection method which allows the internal and external status of gas pipelines to be accurately characterised. Measurements can now be made without reducing the gas flow, and the net effect is both a big improvement in the safety of gas pipelines and substantially reduced inspection costs.

Technology revolutionises gas pipeline checks
Technology revolutionises gas pipeline checks

This solves a long-standing problem for the oil and gas industry, which has previously had to reduce gas flows to check pipelines for possible maintenance requirements. Not only has that imposed considerable expense, but existing inspection methods have not been sufficiently reliable.

The world market for gas pipeline inspection is estimated to be in the order of USD 300 million per year, and the new method can be used both on land and offshore. Building on acoustic resonance principles, it is based on technology employed in the Second World War. DNV applied the same principle to develop a method for determining whether the tanks in the wrecked German battleship Blücher, which is located in the Oslo Fjord, contained water or oil.

So called “pigs” are devices normally used not only to clean but also to carry out condition monitoring in pipelines. Attaching a simple “necklace” to a standard cleaning pig will now make it possible to determine the condition through absolute measurements of the whole pipeline surface -– a radical improvement.
Gassco has already tested the technology on one of its gas pipelines and found the results highly interesting. Performance has been so good that Gassco and DNV have decided to establish a joint venture to commercialise the solution. The big oil companies have also begun to show an interest.

“For us, this means that inspection and maintenance costs can be sharply reduced while enhancing the quality of the inspections,” said Brian Bjordal, president and CEO of Gassco. “Now wall thickness can be measured much more exactly. This technological advance probably has a global market potential.”

“Gas pipeline inspection is revolutionised with this new technology,” said Henrik O. Madsen, CEO and President of DNV. “Based on acoustic half-wave resonance, it represents a technological quantum leap. The industry will now secure effective decision support for maintenance and repair, and we will enhance safety and cost-efficiency for the pipeline network.”

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