Newer, simpler fixes restore corroded pipelines

Dec 14, 2007

Researchers are taking the guesswork out of repairing corroded oil and gas pipelines with two recent studies that appeared in the journal Experimental Techniques.

Historically, engineers repairing corroded pipeline segments have not had much guidance in regard to measuring the effectiveness of their choice of repair materials. This is especially true in the case of repair materials for internal defects, which have been difficult to assess. Researcher J.L.F. Freire of the Catholic University of Rio de Janeiro and his colleagues are easing in quantifying the effectiveness of the repair systems with a new approach that models and measures pipes’ strength.

They applied the fiberglass-composite repairs to pipeline tubes with machined defects made to resemble natural corrosion. Using strain gages, they measured the strength of the repairs while pumping pressurized water through the pipes. Their study revealed wide variation in the repair materials’ quality. While one system proved stronger than an unblemished pipe, another was only 25 percent as strong.

“We can use these models and tests to establish standards for repair systems,” Freire said, “and to compare different ones.”

In the second study, researchers found that thin, precurved, steel lamina effectively repair external corrosion without compromising pipes’ elasticity or strength. Lead researcher M.A. Perez Rosas and colleagues at the Department of Mechanical Engineering, PUC-Rio, tested the new steel sheaths on scaled-down piping segments that were pressurized to simulate the flow of oil. Four layers of low-carbon steel or two layers of stronger steel both made the treated pipe segment stronger than the original.

“I would expect the lamina to work well in the field,” Rosas said. “They’re thin, easy to manage, and they eliminate the need for welding.”

Source: Blackwell Publishing Ltd.

Explore further: Drone postal deliveries begin in Switzerland

Related Stories

The welding system of the future is self-learning

Mar 20, 2015

Lappeenranta University of Technology (LUT) is developing an entirely new kind of welding system, one which solves quality and productivity problems related to automated and mechanised welding. The system ...

Deep Alpine Fault borehole primed with instruments

Jan 14, 2015

An ambitious project to drill 1.3 kilometres into the Alpine Fault has been halted early by equipment problems, but it has still yielded a large amount of useful information about the inner workings of the ...

Graphene proves a long-lasting lubricant

Oct 14, 2014

When trying to design a mechanical system to last as long as possible, scientists and engineers have to find ways of overcoming friction. While researchers have found many materials that help to reduce friction, ...

Seeds to skyscrapers

Jun 25, 2014

Wood is one of the oldest building materials but its use is limited by its properties. With new funding, researchers aim to stretch these properties to an unprecedented degree, creating the means to build ...

Recommended for you

Drone postal deliveries begin in Switzerland

10 hours ago

Wondering where your package is? Look up! Switzerland's postal service said Tuesday it had begun testing parcel deliveries by unmanned drones, although widespread use of the flying postmen is not likely to kick in for another ...

Omnidirectional free space wireless charging developed

10 hours ago

Mobile devices, such as smartphones and laptops, have become indispensable portable items in modern life, but one big challenge remains to fully enjoying these devices: keeping their batteries charged.

Europe's deepest glider to be developed

Jul 06, 2015

19 partners from across Europe have come together to develop Europe's first ultra-deep-sea robot glider. This glider will be capable of sampling the ocean autonomously at depths of 5000m, and maybe more in ...

Researchers help reconstructing the Michelangelo bronzes

Jul 06, 2015

Engineers and imagers from the University of Warwick's Warwick Manufacturing Group (WMG) and anatomists from Warwick Medical School at the University of Warwick are helping Art historians from the University ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.