Manufacturing AUTOMATION

Police chief: Smoke from Texas chemical plant fire not toxic

August 31, 2017
By Gregory Bull Emily Schmall & Reese Dunklin AP

Aug. 31, 2017 – A Houston-area chemical plant that lost power after Harvey engulfed the area in floods was rocked by fires and two explosions early Thursday, but local authorities said the resulting smoke presented “no danger to the community at all.”

Arkema Inc. said in a statement on its website that the Harris County Emergency Operations Center reported two explosions and black smoke coming from the plant in Crosby, about 25 miles (40 kilometres) northeast of Houston, at about 2 a.m.

At a news conference Thursday, Rich Rennard, an Arkema executive, said the remaining chemicals are volatile and that more combustion is likely. He said refrigerated containers were used to store organic peroxide after the flooding caused the plant’s regular power and backup generators to fail. But those refrigerated containers also failed, causing the chemicals to degrade and eventually burn in one of the containers before dawn Thursday.

He said the company anticipates that the eight remaining containers “where products are starting to degrade will produce more explosions.”

At an earlier news conference, Assistant Harris County Fire Chief Bob Royall said the different grades of organic peroxides in a semi-trailer caught fire not long after midnight. Royall said the fire emitted a 30- to 40-foot (9- to 12-meter) flames and black smoke. Harris County Fire Marshal spokeswoman Rachel Moreno later put the quantity of burning organic peroxide at 2 tons.


Rayall did not refer to any blasts, but Moreno said at the news conference that there had been “small explosions.”

Harris County Sheriff Ed Gonzalez says some deputies suffered irritated eyes from the smoke but insisted it wasn’t dangerous.

“It is not anything toxic,” Gonzalez said. “It is not anything that we feel is a danger to the community at all.”

Rennard told reporters that the smoke could cause irritation to skin, lungs and eyes and to avoid the smoke.

At a separate news conference in Washington, D.C., FEMA administrator Brock Long told reporters that “by all means, the plume is incredibly dangerous.”

A plant spokeswoman said late Wednesday that the flooded facility had lost power and backup generators due to the flooding, leaving it without refrigeration for chemicals that become volatile as the temperature rises.

Gonzalez said the fire would burn itself out. Rayall said the fire service was not monitoring the fire — “that’s industry’s responsibility” — and that the company hired a contractor to do aerial monitoring of the smoke to see which direction it was going.

An AP photographer at a roadblock about 2 miles (3 kilometres) from the scene could see no sign of a blaze in the direction of the chemical plant as the sun rose Thursday morning.

Arkema had warned that a fire was going to happen, saying it was inevitable because of the loss of power in the floods.

“The fire will happen. It will resemble a gasoline fire. It will be explosive and intense in nature,” spokeswoman Janet Smith told The Associated Press late Wednesday.

There was “no way to prevent” the explosion, chief executive Rich Rowe said earlier Wednesday.

Arkema manufactures organic peroxides, a family of compounds used for making a variety of products including pharmaceuticals and construction materials.

“As the temperature rises, the natural state of these materials will decompose. A white smoke will result, and that will catch fire,” Smith said. “So the fire is imminent. The question is when.”

Harvey struck Southeast Texas last week, slamming into the coast as a Category 4 hurricane, then weakening to a tropical storm that dumped record amounts of rain on the state, in particular the Houston area. The storm was downgraded to a tropical depression late Wednesday.

The company shut down the Crosby site before Harvey made landfall, but a crew of 11 had stayed behind. That group was removed and residents living within a 1.5-mile (2.4-kilometre) radius were told to evacuate Tuesday after the plant lost power.

Moreno said late Wednesday that the 1.5-mile radius was developed in consultation with the U.S. Department of Homeland Security and other subject-matter experts.

“The facility is surrounded by water right now so we don’t anticipate the fire going anywhere,” she said.

The plant falls along a stretch near Houston that features one of the largest concentrations of refineries, pipelines and chemical plants in the country.

Arkema was required to develop and submit a risk management plan to the U.S. Environmental Protection Agency, because it has large amounts of sulfur dioxide, a toxic chemical, and methylpropene, a flammable gas. The plans are supposed to detail the effects of a potential release, evaluate worst-case scenarios and explain a company’s response.

In its most recently available submission from 2014, Arkema said potentially 1.1 million residents could be impacted over a distance of 23 miles (37 kilometres) in a worse case, according to information compiled by a non-profit group and posted on a website hosted by the Houston Chronicle.

But, Arkema added, it was using “multiple layers of preventative and mitigation measures” at the plant, including steps to reduce the amount of substances released, and that made the worst case “very unlikely.”

Daryl Roberts, the company’s vice-president of manufacturing, technology and regulatory services in the Americas, did not dispute that worst-case scenario but said that assumed all the controls in place failed and strong winds blew directly toward Houston, the nation’s fourth-largest city.

“We have not modelled this exact scenario but we are very comfortable with this 1.5-mile radius,” Roberts told the AP. He added that it mostly resembled less serious scenarios that would affect a half-mile radius and a few dozen people.

Roberts said the vessels containing the organic peroxide are equipped with controls to slow the release of chemicals. He said the chemicals will quickly vaporize because of the water, reducing the size and scope of the fire.

Schmall and Dunklin reported from Dallas. Associated Press writer Claudia Lauer in Dallas contributed to this report.

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