Rickey T' Payne CenterPoint Energy

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Integrity ManagementCase Study Direct
Assessment ECDA and ICDA

• Rickey T. Payne CenterPoint Energy

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CenterPoint Energy Line FT-11Ouachita Parish, LA

• HCA Stationing
• 44713 46500
• 54150 55055
• (Non-HCA 46500 54150)

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ECDA Pre AssessmentECDA Segment Stations44713
55055

• ECDA Regions
• Region 1 Soil Cover
• 1962, Grade B 8
• 1996, Grade X-42 8 (uncased crossing), short
  replacement (320 ft.)

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ECDA Pre AssessmentIndirect Inspection Tool
Selection

• Region 1
• Close Interval Survey (CIS) on/off, rectifiers
  interrupted
• Direct Current Voltage Gradient (DCVG)
• May supplement with PCM/ACVG at field
  technicians discretion
• Record pipeline depth-of-cover on 100 ft. spacing
• Soil Resistivity measurements start, end, 1/3,
  and 2/3 distance along segment length with
  additional measurements at field technicians
  discretion

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ICDA Pre Assessment

• ICDA Region Input to input
• Initial Region
• Input to end of last downstream HCA 000
  55055
• Detailed Data Collection
• ICDA feasibility
• Gas flow information
• Data elements
• Pipe related
• Construction related
• Historical
• Gas Quality
• Operations

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ECDA Indirect Inspection

• Tools utilized
• Close Interval Survey (CIS)
• Direct Current Voltage Gradient (DCVG)
• Pipeline Current Mapper (PCM)

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ICDA Indirect Inspection

• Run flow model to identify Critical Inclination
  Angle
• Calculated value 8.98 degrees (high flow
  conditions)

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ICDA Indirect Inspection

• Pipeline Elevation Profile
• Land surveyor using Real-Time Kinetic (RTK) GPS
  technique for surface elevation
• Sub centimeter accuracy capability
• Pipe location and depth-of-cover survey conducted
  concurrently with surface elevation survey
• Actual pipeline elevation data stored
  electronically in field
• Measurement spacing- 50 ft. max. with more
  frequent spacing on a discretionary basis
  (topographical features, creeks, roads, etc.)

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ECDA Direct Examinations

• Pipe-to-Soil potential measurements
• Sample collections for soil/water chemistry
• Coating defects inspection
• Corrosion defects inspection
• 3rd Party damage inspection
• Non-Destructive Testing and Remaining Strength
  calculations
• Repairs/remediation as required
• Photographic documentation of all steps

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ICDA Detailed Examinations

• Two detailed examinations minimum- first low
  point and first Critical Inclination Angle
• Include all applicable ECDA direct examination
  procedures
• Utilize Guided Wave Ultrasonic Technology as a
  screening tool to identify areas for more
  in-depth testing
• Take ultrasonic thickness measurements in
  specific areas using either UT grid measurements
  or automated scanning UT.
• No internal corrosion found
• Final ICDA Region defined from input to last dig
  where no corrosion was found
• Internal corrosion found
• Additional detailed examinations required (NACE
  DG-ICDA Methodology)

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Cases Where ECDA and ICDA Direct Examinations Can
be Conducted in the Same Excavation

• Where ECDA defects of a severity level calling
  for direct examination correspond to either the
  ICDA first low point or first Critical
  Inclination Angle
• Where no ECDA defects correspond with either the
  ICDA first low point or first Critical
  Inclination Angle, an ECDA validation direct
  examination can be conducted

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