ICDA of Gas Transmission, Gathering

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ICDA of Gas Transmission, Gathering Storage
Systems

• GOAL Develop a protocol for Validation of dry
  gas ICDA method
• Identify data needs
• Develop procedures for validation
• Develop evaluation criteria
• TASK
• Identify sources of field data for validation
• Validate ICDA method for dry gas
• Demonstrate the method using an example

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Dry Gas ICDA Approach
Utilizing a fluid flow model, the critical angle
for water accumulation is determined as a
function of gas velocity.
The actual angle of inclination of pipe with
respect to gas flow direction is determined
through digital elevation maps and pipe burial
depths
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Example 1
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ICDA Process
First highest angle
corrosion
corrosion
corrosion
corrosion
corrosion
0
1
2
3
-2
-1
-3
-4
Gas flow
No corrosion
No corrosion
Region
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Example 1 ICDA Score Card

• A historical IC leak was predicted by ICDA.

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ICDA Methodologyfor Wet Gas ICDA Goal

• GOAL Develop a method for wet gas ICDA to
• Identify locations most likely to have maximum
  internal corrosion
• Transmission, gathering storage pipelines
• Focus on HCA rule
• Status
• Consensus developed on overall methodology
• Detailed flow modeling using FLUENT indicates
  applicability of a critical angle
• Work ongoing to develop probability distributions
  for corrosion severity with distance
• Need ILI (or other integrity) data

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Improvements to ECDA Assessment Methodology by
Incorporating Soils Data

• GOAL Obtain field data for soils to develop a
  soils model for existing external corrosion
  direct assessment (ECDA) datasets and methodology
• Identify corrosion/soils model protocol
• Task
• Establish dataset of existing field inspection
  sites with indirect soils inspection data
• Collect soils-related data from on-going ECDA
  effort
• modify existing soils model, which was developed
  for stress-corrosion cracking assessments, for
  ECDA.
• Effort will be conducted concurrently with an
  ECDA demonstration project funded by GTI/PRCI.

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Improvements to ECDA Assessment Methodology by
Incorporating Soils Data

• Status
• Completed collecting soils data from existing
  operator dataset
• On-going effort to collect soils-related data
  from parallel RD effort with GTI/PRCI
• Soils model modification currently under
  development

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Develop high-amplitude guidedwave for long range
pipeline inspection

• GOAL Develop a method for rapid screening in
  long lengths of pipe for corrosion other
  defects
• Need high-power, guided-wave inspection
  technology in buried applications with bituman
  coating
• Target goal is an increase by 20 fold of
  amplitude
• Task
• Investigate multiple sensor/strip pairs sensor
  optimization
• Evaluate alternate strip materials
• Modify existing system and validate performance
• Conduct field demonstrations

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