In late May 2026, a catastrophic accident at an integrated pulp and paper mill in Longview, Washington, drew renewed attention to storage tank safety across the manufacturing sector. A large chemical storage tank containing “white liquor,” a highly caustic solution used in the kraft pulp production process, imploded, killing 11 workers and injuring several others.
Beyond the human tragedy, this incident has reignited a critical discussion across the industry: Are we doing enough to inspect and maintain above-ground storage tanks before failure occurs?
A Catastrophic Failure with Lasting Impact
The tank involved in the Longview mill incident was designed to store nearly 900,000 gallons of hazardous chemicals. Its failure released a surge of caustic liquid with the potential to cause severe burns, structural damage, and environmental contamination. Emergency responders faced significant hazards, including structural instability, chemical exposure, and the risk of additional collapse. Given the extent of the damage, authorities ultimately shifted from rescue to recovery operations. Although investigations remain underway, an early concern has surfaced: the tank was not covered by routine state or federal inspection requirements, underscoring a regulatory gap for certain above-ground industrial storage systems.
Although white liquor storage may not be directly subject to specific federal or state tank inspection standards, facility owners remain responsible for providing a workplace “free from recognized hazards” under the OSH Act’s General Duty Clause. Potential for vacuum failure is a known hazard of atmospheric storage tanks for which owners must consider possible impacts and mitigation strategies as part of a proactive tank integrity program.
The Inspection Gap: A Preventable Risk?
Experts have pointed out that, unlike many oil and gas storage systems, certain industrial tanks, especially those holding process chemicals, may have limited state or federal oversight. This places the burden of inspection, maintenance, and integrity management almost entirely on facility owners. Without a structured program, even well-designed tanks can experience:
- Material degradation
- Undetected corrosion
- Foundation settlement
- Welding or fabrication defects
- Operational stress or overpressure
When these risks go unidentified, the results can be catastrophic.
The Role of Certified Tank Inspection
Qualified inspection programs and certified professionals are essential to identifying tank integrity issues before they lead to failure. At Trinity Consultants, we recognize that storage tank integrity extends beyond compliance; it is fundamental to protecting worker safety, maintaining operations, and reducing risk.
Trinity’s Capabilities Include:
STI (Steel Tank Institute) Certified Inspections
- Inspection of above-ground and underground storage tanks
- Compliance with STI SP001 and related standards
- Identification of corrosion, coating breakdown, and structural deficiencies
API 653 Certified Tank Inspection
- Comprehensive above-ground storage tank inspections
- Fitness-for-service evaluations
- Repair and alteration oversight
- Remaining life assessments
Non-Destructive Examination (NDE)
- Ultrasonic Thickness (UT) testing
- Magnetic Particle (MT) and Dye Penetrant (PT)
- Advanced methods to detect defects before they become failures
Moving from Reactive to Proactive
The Longview tragedy underscores a key lesson: waiting for failure is not an option. A proactive integrity management program offers significant advantages:
- Early detection of deterioration before it becomes critical
- Improved safety for personnel and surrounding communities
- Reduced downtime and repair costs
- Regulatory alignment and audit readiness
Most importantly, it helps prevent the kind of catastrophic events that cause irreversible loss.
A Call to Action for Industry Leaders
While investigations will ultimately determine the root cause of the Longview mill tank failure, one fact is clear: inspection and maintenance cannot be overlooked even when regulations are unclear or absent.
Facilities operating storage tanks, especially those containing hazardous or corrosive materials, should take this moment as an opportunity to reassess their programs:
- When was your last full internal or external inspection?
- Are you following recognized standards like API 653 or STI SP001?
- Are you leveraging NDE to validate tank integrity?
- Do you have documented inspection intervals and repair strategies?
If any of these answers are uncertain, the risk may already be present.
Partnering for Safer Operations
At Trinity Consultants, we bring certified expertise, advanced inspection technologies, and a safety-first approach to every project. Our goal is simple: help clients identify risks early, extend asset life, and protect people and operations. The events in Washington serve as a sobering reminder of what’s at stake. With the right partners and inspection protocols in place, these tragedies are preventable.
If you’d like to learn more about Trinity’s tank inspection and NDE capabilities and how we can help, please email Dane Mercer or contact him via phone at 806.683.3883.
