federal railroad administration non-accident releases (nars) … · 2019-11-07 · hazmat federal...
TRANSCRIPT
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Hazmat
Federal Railroad Administration Non-Accident Releases (NARs) and
Tank Car Safety
Kurt Eichenlaub
Hazardous Materials Division
Federal Railroad Administration
FRA HM Seminar Reno, NV
June 25-27, 2013
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Overview
• NAR Defined • Incident Reporting • NAR Trend Analysis
• Overview of DOT Incident data • Review of 2012 AAR/BOE Annual
Report on NARs • AAR/BOE Statistics updated April 2013
• Common failures (PRDs, Vacuum valves, bottom outlet valves etc.)
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Definition of a NAR
“The unintentional release of a hazardous material while in transportation, including loading and unloading while in railroad possession, that is not caused by a derailment, collision or other rail related accident. NARs consist of leaks, splashes, and other releases from improperly secured or defective valves, fittings, and tank shells, and also include venting of non-atmospheric gases from safety relief devices.” Atmospheric gases: air, nitrogen, oxygen, argon, krypton, neon, xenon
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Incident Reporting
• 49 CFR, Section 171.16(a)(2) Must submit a DOT Form F 5800.1 for any unintentional release of a hazardous material during transportation
• DOT 5800.1 Form F: http://www.phmsa.dot.gov/hazmat/incident-report
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FRA Regional Map
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Incident Data
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2012 AAR/BOE Report
• Annual Report of Non-Accident Releases of Hazardous Materials Transported by Rail (July 2012) for calendar year 2011
• AAR/BOE NAR Reduction Program http://nar.aar.com/
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Historical Overview
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Hazard Class
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Commodity
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NAR Rates By Hazard Class
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Vacuum Relief Valve
• Vacuum relief valves: The number of failures are on the decline, perhaps due to discontinued use, or replacement with “no-step” designed vacuum valves.
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Manways • Proper selection and application of
gasket. Is it the right size and material for the service?
• Measurable/Repeatable securement of manway cover, including the tightening sequence.
• Apply proper torque. Too much can damage manway cover and bolts, and too little could cause the manway to come loose.
• Examine/clean/replace manway bolts as appropriate.
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Pressure Relief Valve (Safety Relief Valve)
PRV/SRV
• Although it doesn’t quite come through in the statistics of NARs, FRA has noted a significant increase in the number of stem failures on PRDs, causing the entire stem/spring internals to fall into the tank, primarily in ethanol service, but notably increasing in crude oil service as well.
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PRV/SRV Failures
• Possible causes: • Stress (bending/flexing) due to forces
experienced during transportation. • Excessive hydrostatic pressure surges. • Corrosion • Some combination of the above
• A pressure relief valve may be lifted with minimal effort manually if the stem has failed. Requires replacement by AAR certified tank car facility.
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Bottom Outlet Valves (BOVs)
• Most common problem is damage to the ball (dents/scratches) due to buildup of solid particles at the BOV.
• Requires repair by certified tank car facility, and could likely be prevented with appropriate maintenance qualification program.
• Stem packing leaks – could be prevented by proper examination and securement of packing gland nut.
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NAR Inspections
• Regional Specialists receive reports of NARs that originated or occurred in their region.
• Regional Specialists communicate with other affected regions and prioritize and assign responsibility for investigation, as appropriate given resources and circumstances.
• Facilities with recurrent NARs may be subject to more frequent inspections.
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Resources
• AAR/BOE Pamphlet 34, Recommended procedures for loading/unloading pressure and non-pressure tank cars http://www.aar.com/CPC-1245%20Pamphlet%2034.pdf
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Resources
• Renewable Fuels Association – Guidelines for Assembly of Hinged and Bolted Manway Covers.
• FRA Safety Advisory 2009-2: Inspection of Bottom Outlet Valves and Assemblies
http://www.gpo.gov/fdsys/pkg/FR-2009-10-16/html/E9-24927.htm
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Resources
• PHMSA incident data/reporting: http://www.phmsa.dot.gov/hazmat/library/data-stats/incidents • AAR/BOE NAR Reduction Program http://www.nar.aar.com/
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Questions?
Still have Question? • Contact me at: 202-493-6050
• Visit FRA’s web page: www.fra.dot.gov • Visit PHMSA’s web page: www.hazmat.dot.gov • E-mail me at [email protected] OR • E-mail [email protected]