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Researchers map natural gas leaks

US: Natural gas leaks can cause serious problems, for instance, a 20-inch Columbia Gas transmission line exploded in Sissonville, West Virginia, US and destroyed four homes and essentially cooked a section of the interstate.

To see what Boston had going on in its natural gas pipelines, a team of scientists set out to map and measure leaks throughout the city. After all was said and done, they spent a month driving 785 miles — and they discovered 3,356 methane leaks.

“Essentially we were producing a street map block-by-block,” said Robert Jackson, professor at Duke University’s Biology Department. “This is the first time anyone’s ever measured a whole city systematically like this.”

Jackson helped lead the study along with Nathan Phillips, associate professor at Boston University’s Department of Earth and Environment. During the month they spent measuring, they drove about 20 miles-per-hour down each street, sometimes in both directions, using a tool called a Picarro G2301 Cavity Ring-down Spectrometer.

It’s a fast-response methane analyser that measures methane concentrations higher than 2 parts per million (the normal amount in the air). They combined the methane measurement device with a high-resolution GPS, and loaded those in the car. The devices were connected so as they measured methane concentrations, they also mapped where they were. This information was then loaded into a GIS file to produce a map of the measurements.

When they found large methane leaks that could pose an immediate explosion threat, they stopped and gathered an air sample to analyse the chemistry to determine if the leak was coming from a sewer or landfill, or if it was pipeline gas. A vast majority of the leaks were from pipelines. While all leaks were measured and mapped, the team called in six pipeline leaks they felt were explosion risks, which the utility companies then fixed.

“We tried to work constructively with the gas distribution companies as well as the city,” Jackson said. “The main reason they have so many leaks is because they have so many old pipes. The No. 1 goal should be to replace those old pipes as quickly as possible.”

The report even got the attention of a top US congressman on the Energy and Commerce Committee.

“This study shows that we need a plan to ensure leaks from aging natural gas pipelines in Boston and other cities and communities are repaired, so that we can conserve this important natural resource, protect the consumers from paying for gas that they don’t even use, and prevent emissions of greenhouse gases into the environment,” Massachusetts Rep. Ed Markey wrote in a letter to the Pipeline and Hazardous Materials Safety Administration.

Source: Gov Tech