Hurricane Season Starts June 1st Will your tank farms be ready?

Every year during hurricane season I have a couple of articles I like to repost due to the important reminders they detail. This past week I received the below from an email from Corpus Christi’s National Oceanic and Atmospheric Administration (NOAA) group. As hurricane season is around the corner, June 1st, thought I would share their message as well as start my annual hurricane mini-series.

After the record-breaking Atlantic hurricane season last year, it appears likely that 2021 is in for the sixth consecutive above-average year. First predictions have been released, and the message is straightforward: Yet another very active hurricane season is expected in 2021. With a quite concerning notice that also an above-average probability of hurricane landfalls along the US coastline and in the Caribbean is likely. Full article.

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October 4 - SPCC Compliance

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Corpus Christi NOAA Advisory Summary:

2021 Hurricane Guide Now Online: The NWS Corpus Christi 2021 Hurricane Guide is now online.

Upcoming SECART Hurricane Webinars in May and June: The National Hurricane Center (NHC) is again partnering with NOAA’s Southeast and Caribbean Regional Collaboration Team (SECART) to offer a series of hurricane-related webinars on May 3, May 10 (in Spanish), May 17, May 24, May 27, and June 3 on a variety of hurricane-related topics. Please see this link for additional information.

New Normals for Hurricane Season: Beginning with this year’s hurricane season outlooks, NOAA’s Climate Prediction Center (CPC) will use 1991-2020 as the new 30-year period of record. The updated averages for the Atlantic hurricane season have increased with 14 named storms and 7 hurricanes. The average for major hurricanes (Category 3, 4, or 5) remains unchanged at 3.

These normals are used when determining if a season is below, near, or above normal in terms of storm activity. The previous Atlantic storm averages, based on the period from 1981 to 2010, were 12 named storms, 6 hurricanes, and 3 major hurricanes. More information about this is available in the press release here.

Regular Tropical Weather Outlooks to Begin May 15: The National Hurricane Center will begin issuing routine Tropical Weather Outlooks on May 15. This does not mean that the start of the Atlantic hurricane season has changed this year, only that these outlooks will begin before the official start of the season on June 1.

Flashback article, the Houston Chronicle, June 4, 2020: Gulf chemical plants unprepared for increasing flood risk from climate change: report

Have you changed anything physical onsite over the past several years to better prepare? Have you developed any new protocols to address the current “new” norms, i.e., heavier rains bringing in more widespread flooding, being experienced?

Hurricane season is similar to a slot machine – unpredictable in nature. You never know what is going to happen weather-wise during this time of year. However, it’s always wise to prepare for a potential hurricane, and that goes for oil companies with tank farms too. Furthermore, there are tools and methodologies to assist with post-hurricane damages.

Before a hurricane, companies should ask themselves:

• If secondary containment floods, what is the required amount of product to keep the tank from floating away?
• If there are strong winds, how much wind force should be considered acting on the tanks, and how much more product is required to keep the tank from moving?
• Are old tanks more susceptible to damage than tanks built to newer codes?
• Are small tanks with higher aspect ratios more likely to overturn than big tanks?
• What could be the effect of moving water on tanks located at my facility due to rainwater drain-off after flooding?
• If there is not enough oil to fill tanks, what alternatives do I have to be reasonably safe?

Sadly, not everyone asks these questions in advance or prepares plans before a hurricane hits that will help mitigate against potential hurricane-related issues. What happens when you don’t prepare? The minute a hurricane or other major tropical depression is on the horizon, people refer to a generic pre-storm planning checklist to secure operations, rather than following a pre-determined, individualized plan. While this approach is not necessarily wrong, with a well-thought-out preplan in place a more desirable outcome is likely.

What does industry do to help prepare when a weather-related event is imminent? The practice used by most within industry is to anchor tanks and ancillary piping at the same time one starts filling the tanks with water. This practice prevents the tank from floating offsite and/or impacting other objects, minimizing the risk of a spill in the event the anchored tank is impacted by another object. Implementing these preventative measures makes perfect sense and is standard industry practice. However, there is a precise science to the practice as well. As mentioned, there are a significant number of variables to account for that will ensure tanks are properly secured.

Due to the large number of spills generated by flooding events post-Katrina and Rita, the Environmental Protecting Agency’s (EPA) Regional Response Team (RRT) - Region-6 published the following set of guidelines that provide even further guidance and details.

Flood Preparedness Recommended Best Practices

Post-Hurricane

The hurricane has passed, flooding has subsided around storage tanks and now it’s time to assess operations. Most people will focus on the easily noticeable damage flood lines to assess damage levels, blown down items, or damaged items. However, one thing that is not always obvious is tank settling. Similar to how a water-logged car’s electrical system can be hidden from view, settling can be hidden, subsequently obscuring critical failure points looming in the future.

A lightbulb moment: Large trees that have been living near the tanks for hundreds of years have fallen on their sides, but there’s no evidence of wind damage in the immediate area. Why did the trees fall over? In reality, the ground where the trees stood has been saturated for days because of flooding (standing water), which, due to the weight of the trees, loosened the area around their roots and weakened the root structure. Remember, pre-storm procedures instructed one to fill tanks with water; these tanks are incredibly heavy now, and a similar event is possible here too. It may not be as visible; however, it may be enough to cause critical stress fractures or other issues with the tanks.

September 14, 2017 Article

“The AP has identified at least 34 above ground fuel storage tanks and tank batteries that failed during Harvey and released more than 600,000 gallons (2.2 million liters) combined of crude oil, gasoline and other chemicals.

Two storage tanks failed in the (name removed for blog) case. Initial indications suggested the massive tanks floated off their foundations as floodwaters swamped the company’s tank farm, (name removed) said. That’s what happened at tank farms in Louisiana during Hurricane Katrina, when numerous storage tank failures spilled millions of gallons of fuel into floodwaters.”

If in doubt, or if there is any indication that the surrounding areas may have been overly saturated allowing for sub-surface ground disturbances, part of one’s post-recovery efforts should be commencing an API 653 Section 12 and Appendix B methodology for evaluating storage tanks for out–of–plane settlement study or similarly applicable evaluation.

Do not forget, industry also has Underground Storage Tanks (UST) too. Though not part of today’s discussion, here is a great guidance tool published by the EPA with similar pre-and-post event considerations: UST Flood Guide.

Not necessarily related to today’s discussion; however, FEMA prepared the “Ready Business Hurricane Toolkit”, which contains a wealth of helpful information, contacts, and suggestions to better prepare your business for hurricane season and what to do after a hurricane hits.

Need Help?

PRE-HURRICANE PLANNING

Witt O’Brien’s develops pre-hurricane checklists, hurricane manuals/plans and tank risk-assessment reports to help prepare one’s operations. Our subject matter experts (SME) cover a wide spectrum of engineering competencies, emergency response, and environmental planning, giving us a unique capability in managing one’s needs with a wide-angle.

TANK SETTLEMENT – POST-HURRICANE

Witt O’Brien’s SMEs perform the full suite of API 653 tank settlement calculations depending on the damage conditions and future operational needs. We specialize in saving clients millions of dollars by avoiding misdiagnosed tank settlements, unnecessary jacking expenditures, and lost time. Tank jacking is a major repair, and there is the inherent risk that the cure could be worse than the settlement. In addition to the standard API 653 calculations, we have improved methods of analysis to minimize the use of jacking to only the instances where it is truly appropriate.

DIKE/BERM DAMAGE – PRE/POST-HURRICANE

Witt O’Brien’s surveying capabilities cover all sizes of containments from a single tank to hundreds of acres. We offer various 3D modeling solutions that have amazing accuracy of photogrammetric modeling paired with the capturing ability of drones that are supported by GNSS Integrated Network Rover (GPS/cellular) field equipment, and boots-on-the-ground data truthers allow us to offer cutting-edge dike surveys designed to save time and money to our customers throughout the United States. We have experience with many types of dike arrangements and low-cost repair strategies including shared containment.

For a complete listing of archived blogs and compliance insights, click here. Past blogs cover training requirements, clarification on additional confusing elements within the above rules, and much more.

We are here to help solve your compliance questions and challenges. Need some compliance assistance, or just have a question? Please email John K. Carroll III ([email protected]) Associate Managing Director – Compliance Services or call at +1 281-320-9796.

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