Access Midstream requires a pipeline risk model that can manage processing spatial and non-spatial data for over 6,500 miles of pipeline across 7 different states. The model needs to accurately calculate the probability of pipeline failure and the potential consequences to the environment, the public, and to operations. This presentation describes the technical challenges in building the solution and what specific transformer methods in FME were used to overcome those challenges. Examples include managing memory allocation, parallel processing strategies, and incorporating smart pig (ILI) data.

1. Building a Spatial Decision Support
System for Natural Gas Pipeline Risk
Matt Landry – Project Manager
Frank Yeboah - Specialist

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Source: "FullMoon2010" by Gregory H. Revera - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons -
http://commons.wikimedia.org/wiki/File:FullMoon2010.jpg#/media/File:FullMoon2010.jpg

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Source: Wikipedia.org

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𝑅𝑖𝑠𝑘 𝐹𝑎𝑖𝑙𝑢𝑟𝑒 = 𝑃𝑟𝑜𝑏𝑎𝑏𝑖𝑙𝑖𝑡𝑦 𝐹𝑎𝑖𝑙𝑢𝑟𝑒 X 𝐶𝑜𝑛𝑠𝑒𝑞𝑢𝑒𝑛𝑐𝑒Failure

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B2 - Probability
of 3rd Party
Unaware of One-
call (from
Method of
Communicating)
B3 - Probability
of ROW Signs not
Recognized (from
Placement
Frequency)
B4 - Probability
of Permanent
Marker Failure
(from Warning
Tape Presence)
E1 - Probability of
3rd Party
Unaware of
Pipeline
B5 - Probability
of 3rd Party
Choosing not to
Notify (from
Penalty for not
Notifying)
B6 - Probability
of Third Party
Failure to Avoid
Pipeline (from
Default Value –
0.40)
E2 - Probability of
3rd Party
Negligence
E3 - Probability of
Activity not
Notified by 3rd
Party
B7 - Probability
of ACMP
Personnel not On
Patrol During
Activity
B8 - Probability
of Other ACMP
Personnel not
Observing
Activity
E4 - Probability of
Operator
Unaware of
Activity
B9 - Probability
of Excavation
Prior to
Operator’s
Response (from
Response Time)
B6 - Probability
of 3rd Party
Failure to Avoid
Alignment (from
Default Value –
0.40)
B10 & B12 -
Probability of
Temporary Markers
Incorrect (from
Marking Method
and Data Source)
B6 - Probability
of 3rd Party
Failure to Avoid
Alignment (from
Default Value –
0.40)
E5 - Probability of
Absence of
Temporary
Markers
E6 - Probability of
Incorrect
Temporary
Markers
E7 - Probability of
Failure of
Temporary
MarkersB4 - Probability
of Permanent
Marker Failure
(from Warning
Tape Presence)
E8 - Probability of
Failure of
Alignment
Markers
E9 - Probability of
Alignment Not
Properly Marked
B11 - Probability
of Accidental
Interference with
Marked
Alignment
EI Mitigation
Score
(1-10)
OR
OR
OR
OR
AND
AND
AND
AND
AND AND
B12 - Probability
of Centerlines
Incorrect (from
Data Source for
Centerlines)
B13 - Probability
of One-Call
System Failure to
Notify Operator
(from State One-
Call Grade)
OR
OR
𝑃𝑟𝑜𝑏𝑎𝑏𝑖𝑙𝑖𝑡𝑦 𝐹𝑎𝑖𝑙𝑢𝑟𝑒 = Exposure × 𝑀𝑖𝑡𝑖𝑔𝑎𝑡𝑖𝑜𝑛 × 𝑅𝑒𝑠𝑖𝑠𝑡𝑎𝑛𝑐𝑒

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CP Annual Survey Water Analysis
Atmospheric Corrosion Survey Close Interval Survey
Bond Inspection A/C Monitoring Form
Rectifier Inspection ILI Evaluation (3 parts):
Bacteria Serial Dilution • Project Details
Chemical Usage Report • Pipe Tally
Corrosion Coupon Report • Anomaly Evaluation

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Failure
Mode
(XX)
Health and Safety
Consequence
Score
Financial Consequence Score
Public Image
Consequence Score
Environmental
Consequence Score
Lost Lives From
Explosion
Lost Commodity
Cost
Structure
Damage Cost
Downtime Cost
Pipe
Repair
Cost
Public Impact Environmental Impact
Leak w/
Ignition (LI)
X X X X X X X
Leak w/o
Ignition
(LNI)
X X X X X
Rupture w/
Ignition
(RI)
X X X X X X X
Rupture
w/o
Ignition
(RNI)
X X X X X

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Gas
Gathering System
R_GGS_FACTS.fmw
[R_GGS_FACTS]
SEGMENT_ID
R_SEGID_FACTS.fmw
[R_SEGID_FACTS]
GISID_ID
R_GISID_FACTS.fmw
[R_GISID_FACTS]
SUBSEG_ID
R_SUBSEGID_FACTS.fmw
[R_SUBSEGID_FACTS]

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R_GGS_FACTS.fmw

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R_SEGID_FACTS.fmw

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R_GISID_FACTS.fmw

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R_SUBSEGID_FACTS.fmw

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Weather and Outside Forces Process

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Image Source:
http://www.utc.wa.gov/publicSafety/
Documents/Williams%20Presentation
%20-%20ILI%20Technologies.pdf

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Image Source:
http://www.utc.wa.gov/publicSafety/
Documents/Williams%20Presentation
%20-%20ILI%20Technologies.pdf

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Voronoi Polygons

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SUBSEG_ID
R_SUBSEGID_FACTS.fmw
[R_SUBSEGID_FACTS]
Fields: 36
Row Count: 193388
Unique ID: SUBSEG_ID
GGS
R_GGS_FACTS.fmw
[R_GGS_FACTS]
18 Fields
198 Rows
Unique ID: GGS_NUM
GISID
R_GISID_FACTS.fmw
[R_GISID_FACTS]
Fields: 62
Row Count: 9820
Unique ID: GISID
SEGMENT_ID
R_SEGID_FACTS.fmw
[R_SEGID_FACTS]
Fields: 13
Row Count: 6177
Unique ID: SEGMENT_ID

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Thank You!
• Questions?
• For more information:
• Matt Landry, Matthew.Landry@williams.com
• Frank Yeboah, Frank.Yeboah@williams.com