From Alyeska: Alyeska staff find creative solutions for safe snow removal

Submitted by Alyeska Corporate Communications.

While spring officially arrived in March, the snow keeps falling in Valdez, the snowiest city in America. The white stuff has long stymied crews at the Valdez Marine Terminal, who often spend weeks clearing snow from areas around the 1,000-acre facility, including crude oil storage tank roofs. It wasn’t always that way.

“When I started here in the mid-nineties, all we had to do was move oil from tank to tank,” said Al Laudert, a Terminal Maintenance Coordinator. “The oil was so warm, enough of it in the tank would make the snow shed right off the top.”

But with declining throughput, the crude oil leaves the North Slope cooler, takes longer to arrive in Valdez, and isn’t warm enough to melt the snow of the tops of the storage tanks. Alyeska has always had a busy snow removal program, but has had to bring in crews for the tank farms since the early 2000s.

The tank top snow removal crews are made up of 7-10 people who can take up to a week to clear off one tank. This shoveling job is quite a bit bigger than your driveway; the roofs are about an acre in area and more than 60 feet off the ground.

In Valdez, where a “light snow year” is a seasonal accumulation of around 200 inches, snow removal is a problem in search of a solution.

Earlier this winter, maintenance and engineering teams continued their innovative pilot program to use steam piping to melt snow on half of Tank 14.

Crews installed small diameter piping with tiny holes on the half of the tank’s roof, and then hooked it up to a boiler installed on the road below. For the last three winters, the team has run tests, changing variables like the spacing on the holes in the piping and the length of time the boilers run. The tests originally ran for 12 hours at a time, but this winter the crew took advantage of a deeper snowpack and got approval to run the steam for a 36-hour stretch.

The 36-hour test was especially promising, melting a significant amount of snow. The tests will continue next year and Alyeska personnel will start looking at factors like cost, scalability, air quality monitoring of the boilers and other factors to see if steam is a viable long-term solution.

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