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U.S. regulator raises concerns about weights on energy pipelines

Reuters  |  CALGARY, Alberta/WASHINGTON 

By Nia Williams and Valerie Volcovici

CALGARY, Alberta/(Reuters) - A U.S. regulator's preliminary investigation into the biggest spill this year has raised a red flag that could trigger an extensive and costly inspection of tens of thousands of miles of underground energy lines.

The 5,000-barrel leak on Corp's on Nov. 16 in South Dakota might have stemmed from caused by a weight put in place when it was built in 2008, the and Hazardous Materials Safety Administration said in a report published on Tuesday.

Weights are used to prevent pipelines from moving and reduce the risk of or ruptures when water tables rise.

The regulator's finding has implications for the 2,687-mile (4,324 km) and others throughout the world. The weights, which tip the scales at 7,000 pounds (3,175 kg) or more, are commonly used, but only the operators know where they are located.

from weights "could happen on other segments of this and other pipelines," said Najmedin Meshkati, professor of civil and environmental engineering at the University of Southern California.

The carries 590,000 barrels per day from Alberta's sands to U.S. refineries. TransCanada's proposed XL line would add another 830,000 bpd of capacity.

Nebraska officials approved the construction of that line even after the leak, although it is still unclear if will build it.

Depending on the results of the full investigation, construction plans for new lines such as the XL may need modification. Existing lines may also have to be checked, a difficult and potentially expensive undertaking.

U.S. regulators do not have specific information on the types of weights or their locations because companies are not required to submit data, said Carl Weimer, executive director of the non-profit Safety Trust.

PHMSA did not respond to requests for comment on this question.

The Canadian Energy Association also said operators, not regulators, keep tabs on this information. "We would not have an inventory; that would need to come from the individual companies," said Carla Beynon, a spokeswoman for the industry group.

On Tuesday, PHMSA ordered to clean up the site and analyze data on the location of other weights on the line where the land may have similar characteristics as where the leak occurred. would not say how many weights were placed along the pipeline, which runs through several states and Canadian provinces, during construction.

In one of those states, the North Dakota Public Service Commission, which regulates pipelines, has asked for briefings with on its monitoring procedures. Commissioners are also waiting to see the full PHMSA report and results of testing on the damaged section of

"If there are issues on how this was designed and constructed, we will certainly be concerned," said commission Chairman Randy Christmann.


Using weights made of sand, gravel or concrete is standard, companies and industry representatives said.

"This is the first time I've heard of this type of issue causing an incident," said Association of Pipe Lines spokesman John Stoody.

A handful of companies, including PipeSak Products & Services and Keymay Industries, manufacture bagged weights filled with gravel or permeable textiles, but pipelines built before 2009 like would probably have 7,000-to-9,000-pound concrete weights.

The line's coating may have been scratched during installation, which could have led to corrosion, said PipeSak President Geoff Connors.

Weimer, the Safety Trust director, said problems during Keystone's construction, when ditches filled up with water, signaled that weighting was needed in those places.

"We are hoping more information gets released about how prevalent the weights are," he said.

The 5,000-barrel leak came just days before regulators in neighboring Nebraska approved a route for the long-delayed and controversial XL

XL opponents, who have campaigned against the on concerns that a spill could pollute areas vital to Nebraska's agriculture industry, said the PHMSA report reinforced those worries.

"This has implications for XL, which crosses over the Ogallala aquifer and would require similar construction," said Anthony Swift, director of the Natural Resources Defense Council environmental group's Canada Project.

did not say whether it would use a similar practice of weighting for the XL.

Crystal Rhoades, one of two Nebraska Public Service commissioners who voted against the last permit needed for XL, said the commission had no jurisdiction over safety issues and therefore probably could not revoke TransCanada's permit or request additional conditions on the

Former engineer Evan Vokes, a whistleblower, said spills occurred due to shoddy or outmoded construction techniques. He said little could be done to prevent leaks once weights are installed if they are not built in the right places.

"The time to address this is when you put it in the ditch," he said.

"It's a pointless exercise to fix it afterwards. It's like putting on a helmet and running through a shooting range."

(Additional reporting by Catherine Ngai in New York; Editing by David Gaffen, Simon Webb and Lisa Von Ahn)

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

First Published: Mon, December 04 2017. 21:08 IST