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Allegro ENERGY CONSULTING Corro sion November 17, 2011 New Orleans, LA © Cheryl J. Trench, 2011 A Tour of Lessons Learned from PHMSA Accident Data Prepared.

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Presentation on theme: "Allegro ENERGY CONSULTING Corro sion November 17, 2011 New Orleans, LA © Cheryl J. Trench, 2011 A Tour of Lessons Learned from PHMSA Accident Data Prepared."— Presentation transcript:

1 Allegro ENERGY CONSULTING Corro sion November 17, 2011 New Orleans, LA © Cheryl J. Trench, 2011 A Tour of Lessons Learned from PHMSA Accident Data Prepared by Cheryl J. Trench President Allegro Energy Consulting For the Pipeline Safety Trust’s 2011 Conference Allegro Energy Consulting P.O. Box  New York, NY Phone: (212)  Fax: (212)

2 Allegro ENERGY CONSULTING Differentiate!  External versus internal corrosion  Mainline pipe versus station (facilities) piping  Characteristics plus prevention / mitigation  Commodity characteristics  Crude versus refined product or HVL, e.g.  Flow characteristics  Turbulent ?  Operator: “I’ve never seen an internal corrosion release in a line with turbulent flow”  Dead leg? Drain or relief line?

3 Allegro ENERGY CONSULTING Corrosion Location? System Part? Onshore Pipe Station Piping Other Parts Number of incidents, PHMSA , , onshore pipe, 5 bbls or more, or death, injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore Overall, More on Onshore Pipe [245 v 125 in station piping] More Internal Corr. In Stations [105 v 76 in onshore pipe]

4 Allegro ENERGY CONSULTING What about Year-to-Year? External Corrosion Internal Corrosion Onshore PipeStation Piping Number of incidents, PHMSA , , onshore pipe, 5 bbls or more, or death, injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore Internal Corrosion External

5 Allegro ENERGY CONSULTING Which Commodities? For Internal Corrosion, Crude Oil Onshore Pipeline Station Piping Number of incidents, PHMSA , , onshore pipe, 5 bbls or more, or death, injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore

6 Allegro ENERGY CONSULTING Data Mining Team Has Addressed  Facilities Releases:  Special survey on relief lines, drain lines, dead legs, small pipe diameter and tubing, inspection practices  Additions to PPTS Survey (PHMSA, too) : more detail on flow, small piping and tubing, fittings  9_5PPTS_Operator_Advisory_Facilities_OTC_Final.pdf 9_5PPTS_Operator_Advisory_Facilities_OTC_Final.pdf  Corrosion on mainline pipe and in facilities:  advisories.cfm [coming in Dec. 2011] advisories.cfm

7 Allegro ENERGY CONSULTING Sidebar: Internal Corrosion and Canadian Crude  From PHMSA accident data  Which lines with interconnections to Canadian crude have had internal corrosion releases?  From Energy Information Administration  Form 814; shipment-by-shipment crude imports  Which refineries are getting Canadian crude?  From pipeline industry info  How would it get there? Interconnections for crude oil transport, including storage hubs ANSWER: NOT ONE

8 Allegro ENERGY CONSULTING Sidebar [cont’d]  Checked with operator for each crude oil internal corrosion release in an appropriate state  Each one transporting domestic crude (Williston Basin, CO, KS, OK)  FYI, operators took mitigative action  One line now has a connection to AB crude (via Cushing) but did not at the time of release (2004) No internal corrosion crude releases on U.S. mainline pipe have involved oil sands crude oil

9 Allegro ENERGY CONSULTING Observations on Tool Data: More Complicated than You’d Think!  Tool runs for point of release recorded since 2002  Tool type, year of run  Have previously compiled tool data by cause  Right tool?  Timing?  Previously damaged pipe, e.g.: don’t know if tool run before or after damage  External corrosion: found that many properly called, but had already turned into weeper by excavation  Signature recognizable? Tool smart enough?

10 Allegro ENERGY CONSULTING 82% Improvement in ROW Record for Pre-1950s Pipe Number of Releases per Year External Corrosion Internal Corrosion Seams, Welds


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