Tag: corrosion

Pitting Corrosion and the Impact of Zebra and Quagga Mussels on Bare Steel Pipelines

FOR IMMEDIATE RELEASE TO MEDIA: November 3, 2017


Liz Kirkwood, Executive Director                                                                  Cell: 570-872-4956
FLOW (For Love of Water)                                                                             Email: liz@flowforwater.org

Gary Street, Technical Advisor                                                                       Phone: 231-944-1568
FLOW (For Love of Water)                                                               


Portions of the steel oil pipelines in the Mackinac Straits may have lost half their wall thickness since installation in 1953 and become dangerously weakened due to hard-to-detect pitting corrosion, an engineering expert said today.

The independent analysis further strengthens the case for an immediate shutdown of Line 5 to prevent a catastrophic oil spill in the Great Lakes, according to FLOW, a Great Lakes law and policy center based in Traverse City. The full analysis can be found at www.FLOWforWater.org.

The possible damage stems from invasive zebra and quagga mussels that have covered portions of the dual underwater pipelines for years, inhibiting external inspection of Line 5 while possibly weakening the steel.

“The cause of their corrosiveness is the excrement from the mussels, which is acidic. An acidic deposit on bare steel leads to corrosion,” said Gary Street, MS, PE, the former director of engineering at Dow Environmental who conducted the analysis. Street notes that pipeline inspection tools called “smart pigs,” which Enbridge uses to detect corrosion, are not very accurate in detecting pitting corrosion.

The disturbing possibility of a significantly weakened Line 5 in the Mackinac Straits comes after recent acknowledgement by the pipeline owner and operator, Enbridge, that there are several large areas of the pipeline where the protective coating is missing. According to Enbridge, the bare steel on Line 5 in the Mackinac Straits was detected by Canadian oil transport giant Enbridge in 2014 when the company installed more supports, but not revealed to regulators until this summer.

“What else is Enbridge hiding from the public and state regulators?” asked Liz Kirkwood, executive director of FLOW and an environmental lawyer. “Attorney General Bill Schuette must immediately enforce the laws protecting the Great Lakes and revoke the state easement that has allowed a private Canadian company conditional use of our public waters and bottomlands.”

Not all types of corrosion are equally harmful. Some forms are far worse than others. Pitting corrosion is a localized form of corrosion by which tiny cavities or “holes” are produced in the material. The National Association of Corrosion Engineers has stated, “While corrosion of bare steel can take many forms, the most insidious, is pitting corrosion.”

“The prudent scenario is to assume that damage originally occurred in 2003 when the first of the new supports was installed,” said Street, whose 35+ year career in industry and consulting has covered an extensive range of experience in environmental engineering, chemical process design, ethanol production processes, minimization of waste materials, project management, and engineering management. “That being the case, it is very possible that the Line 5 pipe wall has suffered serious pitting corrosion beginning at that time. Making the matter worse, pitting corrosion is very difficult to detect.”

Enbridge acknowledged the areas of external anti-corrosion coating loss in September. Several of the areas are larger than the “Band-Aid“-sized areas Enbridge initially described when the gaps were revealed. The largest patch of exposed pipeline metal is 16 inches long and 10 inches wide. Others are narrower but also exceed a foot in length.

Also detailed in the Enbridge reports is a “disturbed” coating area that’s more than 3 feet long, a “dislodged” coating area that’s 13 feet long and a mysterious 8-inch “white deposit” of unknown origin that Enbridge says “remains under investigation.”

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PR: State of Michigan Takes a “Holiday” from Preventing Line 5 Oil Spill Disaster in Great Lakes

FOR IMMEDIATE RELEASE                                                                                         March 9, 2017

Contact:  Liz Kirkwood, Executive Director                                               Email: Liz@FLOWforWater.org

FLOW (For Love of Water)                                                     Office: (231) 944-1568, Cell: (570) 872-4956

 

State of Michigan Takes a “Holiday” from Preventing Line 5 Oil Spill Disaster in Great Lakes

Snyder Administration Watches and Waits as the 64-year-old Dual Pipelines Missing Their Anti-Rust Coating and Structural Supports Continue to Use Mackinac Straits as a High-Risk Shortcut to Private Profits

TRAVERSE CITY, MI – The Snyder administration, in two letters (here and here) released Wednesday, indicated it will seek more information, but take no enforcement action, while continuing to accept Enbridge’s assurances that all is well with dual oil pipelines in the Mackinac Straits that the Canadian company itself has indicated are missing portions of an external, anti-rust coating and lacking 18 anchor supports to prevent the pipes from grinding and bending along the bottom and bursting.

The letters – signed by Attorney General Bill Schuette, Michigan Department of Natural Resources Director Keith Creagh, and Michigan Department of Environmental Quality Director Heidi Grether – describe “inviting” Enbridge to explain the company’s September 2016 report that identifies 19 areas along the submerged steel pipes where the anti-corrosion coating is missing. Enbridge’s report euphemistically calls the missing portions “holidays,” industry jargon for areas where the coating has worn or fallen off. The report outlines a plan for assessing Line 5’s integrity where the coating is gone and acidic waste excreted by invasive mussels that blanket the pipes could be causing corrosion.

Enbridge claims that the report is merely “hypothetical,” even though the report flatly states that the external coating is missing and the words “hypothetical” and “theoretical” are not found in the document.

“The State of Michigan is moving in slow motion to question Enbridge’s claims that its own report doesn’t mean what is plainly says,” said Liz Kirkwood, an environmental attorney and executive director of FLOW, a Traverse City-based water law and policy center dedicated to upholding the public’s rights to use and benefit from the Great Lakes. “When the pipelines finally fail, will the state invite Enbridge to explain what the thick, black substance is pouring out of the 64-year-old pipes and into the drinking water source for nearby Mackinac Island, St. Ignace, and roughly 5 million Michiganders?”

The state issued its March 8 letter in response to February 17 correspondence from the Oil & Water Don’t Mix campaign, which FLOW co-leads with several other leading organizations, that raised grave and detailed concerns about the condition of Line 5 and called for its immediate shutdown.

An Enbridge representative is expected to explain its report at the March 13 quarterly meeting in Lansing of the governor-appointed Michigan Pipeline Safety Advisory Board, whose members include Attorney General Schuette. The advisory board is overseeing the completion of two nominally independent studies funded by Enbridge: one on the financial risk to communities and the Pure Michigan economy of a Line 5 oil spill in the Mackinac Straits and the other on alternatives to the aging pipeline that could avoid such a disaster. These two studies are expected by June 2017.

Enbridge is infamous for leaking more than one million gallons of heavy tar sands oil into the Kalamazoo River watershed near Marshall, Michigan, in 2010, fouling nearly 40 miles of the river and shore, sickening numerous people, harming wildlife, and forcing more than 100 families to permanently abandon their homes and property.

The failure to adequately maintain the Line 5 pipelines, including a lack of supports to prevent bending of the pipeline – is a breach of Enbridge’s 1953 legal easement agreement with the State of Michigan that allows the company to occupy public waters and state bottomlands. The failures documented in the Enbridge report add to the mounting evidence of the unacceptable risk that this infrastructure poses to the Great Lakes.

A three-minute video of Line 5 pipelines in the Straits, researched and edited by FLOW’s engineering expert Dr. Ed Timm, reveals the physical deterioration of Line 5, with missing and dislodged coating, broken bands, detached wooden structural slats, unsupported segments, and possible rust and pitting.

In addition, a just-released technical note prepared by Dr. Timm regarding Line 5 reinforces the urgent need for the state to immediately shut down Line 5 while it evaluates the integrity of the aging infrastructure that pumps nearly 23 million gallons of oil a day through the Mackinac Straits before eventually reaching refineries in Sarnia, Ontario. Specifically, this technical note concludes the following:

  • Line 5 is not immune to corrosion and stress cracking despite its thick walls, contrary to Enbridge’s claims;
  • The asphalt enamel based coating system is compromised or missing on many areas of the pipe;
  • The extent of the coverage by invasive mussels on the pipelines makes it “impossible” to evaluate how much of the coating system is compromised;
  • The easement-required wooden slats that were designed to protect from point loads and abrasion are missing entirely on portions of the pipelines; and
  • The peak currents in the Mackinac Straits are nearly twice the maximum velocity considered when the pipeline was designed, adding significant stress;
  • A full study of the integrity of the coating system that includes a careful examination of the impact of the biofouling on the pipelines is critical to making a proper fitness-for-service evaluation.

“The evidence demands that the State of Michigan respond and fulfill its affirmative fiduciary duty,” wrote Jim Olson, an environmental attorney and FLOW’s president, in a March 9 follow-up letter to the State of Michigan. “It is not enough to stand by the sidelines and merely request additional information from Enbridge given the high risk of a catastrophic oil spill in the Great Lakes that would devastate our public drinking waters and our water-dependent economy. ‘Pure Michigan’ should not just be an advertising slogan.”

For more information, visit the FLOW website at www.FLOWforWater.org

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FINAL FLOW-Line 5 Media Release-Pipeline Coating 3-9-2017