Cheryl Trench, President Allegro Energy Consulting

Report
Allegro
ENERGY CONSULTING
Corro
sion
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 230592  New York, NY 10023
Phone: (212) 787-6923  Fax: (212) 721-9028
[email protected]
November 17, 2011
New Orleans, LA
© Cheryl J. Trench, 2011
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?
Allegro
ENERGY CONSULTING
Corrosion Location? System Part?
Overall, More on Onshore Pipe
[245 v 125 in station piping]
More Internal Corr. In Stations
[105 v 76 in onshore pipe]
Onshore
Pipe
Station
Piping
Other
Parts
Number of incidents, PHMSA 7000-1, 2002-2009, onshore pipe, 5 bbls or more, or death,
injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore
Allegro
ENERGY CONSULTING
What about Year-to-Year?
Onshore Pipe
Station Piping
External Corrosion
Internal Corrosion
Internal Corrosion
External
Number of incidents, PHMSA 7000-1, 2002-2009, onshore pipe, 5 bbls or more, or death,
injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore
Allegro
ENERGY CONSULTING
Which Commodities?
For Internal Corrosion, Crude Oil
Onshore Pipeline
Station Piping
Number of incidents, PHMSA 7000-1, 2002-2009, onshore pipe, 5 bbls or more, or death,
injury, fire, explosion, water pollution or $ damage>$50K ; other parts: tanks, caverns, offshore
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
 http://www.api.org/aboutoilgas/sectors/PPTS/upload/200
9_5PPTS_Operator_Advisory_Facilities_OTC_Final.pdf
 Corrosion on mainline pipe and in facilities:
 http://www.api.org/aboutoilgas/sectors/PPTS/pptsadvisories.cfm [coming in Dec. 2011]
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
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
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?
Allegro
Number of Releases per Year
ENERGY CONSULTING
82% Improvement in
ROW Record for Pre-1950s Pipe
External Corrosion
Seams,
Welds
Internal Corrosion

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