Vital work is underway to assist perceive the chemical tank failure that killed 11 staff final month at a pulp and paper mill in Longview. These investigations ought to present solutions to the devastated households and group — and hopefully stop different tragedies.
In the meantime, in Ferndale, close to Bellingham, one other industrial tank has come below scrutiny due to critical security considerations.
The 2 tanks differ in how they had been constructed and in what they retailer, however the identical essential premise applies — tank issues of safety have to be addressed earlier than it’s too late.
The Ferndale storage tank, in-built 1977 at Cherry Level, depends on a single wall of steel to comprise tens of millions of gallons of refrigerated propane. Nowhere else in North America is that this a lot propane, a kind of liquefied petroleum fuel, saved in a single-walled tank.
Trendy, refrigerated, propane storage tanks embody double-walled full containment methods, in order that if the interior tank fails, the outer containment system can retain launched liquid and vapor. At any time when potential, large-scale propane storage is positioned in underground caverns, reflecting the numerous hearth, explosion and vapor-cloud hazards related to storing massive volumes of propane above floor.
The reason being easy: Whereas catastrophic failures are uncommon, the implications will be disastrous.
I not too long ago offered testimony concerning the outdated Cherry Level tank throughout an attraction by native environmental teams of a county resolution permitting an enlargement of the Ferndale terminal. On account of that attraction, the Whatcom County Listening to Examiner in March ordered county officers to redo a flawed evaluation of the impacts of the LPG terminal enlargement. Sadly, the terminal’s proprietor, AltaGas, is now appealing that decision, arguing that no additional research are wanted, regardless of apparent security and environmental dangers posed by the enlargement of this getting old terminal.
One of many questions that AltaGas, regulators and at-risk communities must reply is whether or not this almost 50-year-old, single-containment propane tank at Cherry Level stays a suitable hazard in one of the crucial environmentally delicate and industrially advanced areas in Washington.
Permitting its continued use is turning into more and more tough to justify. Whereas the tank complied with rules when it was in-built 1977, a tank of this design would by no means be allowed to be constructed to retailer LPG at the moment.
In truth, at its Ridley Island Propane Export Terminal in British Columbia — a facility just like the Ferndale terminal — AltaGas constructed a double-walled full containment refrigerated propane tank in 2019. That tank has a robust, outer concrete shell designed to stop propane from escaping into the atmosphere if the interior metal tank fails.
When you think about the place the Cherry Level tank is located, its out of date design turns into much more regarding. Danger is set not solely by the likelihood of a failure, but in addition by the implications if a failure had been to happen.
A significant propane launch right here might quickly generate a big flammable vapor cloud. If ignited, it might lead to main fires or explosions that might have an effect on close by oil refineries, marine terminals, rail infrastructure, emergency response operations and surrounding communities as far-off as 4 miles from the tank. Emergency planners refer to those considerations as “cascading” or “domino” dangers.
In 1984, a collection of fires and explosions at an LPG terminal close to Mexico Metropolis brought about one of many deadliest industrial disasters in world historical past, with over 500 victims killed and 5,000-7,000 struggling extreme burns. It taught the vitality business important classes together with containing LPG tanks in concrete to cease the tanks from rupturing like a bomb within the occasion of a hearth.
The AltaGas terminal additionally sits adjoining to among the most environmentally important waters within the Pacific Northwest. The shoreline helps important habitat for salmon, herring, marine mammals and migratory birds. The close by waters are central to the cultural and financial lifetime of the Lummi Nation and help industrial, tribal and leisure fisheries.
Changing this propane tank with a contemporary double-containment or full-containment design would require a considerable funding. However in contrast with the financial, environmental, and human penalties of a catastrophic launch, that funding might in the end show far more cost effective.
The lesson from many industrial accidents just isn’t that getting old infrastructure inevitably fails. It’s that communities usually wait too lengthy to switch it.
