North

Applying ECDA Methodology

for Local Distribution

Companies

Josh Brewer

What’s Covered

Regulations

What is ECDA

Tools Used

Data Presentation

TRIMP vs DIMP

Applying ECDA to Distribution

TRIMP Transmission Integrity Management

DIMP Distribution Integrity Management

TRIMP

CFR 49, Part 192, Subpart O

• Have a plan

• ECDA, ICDA, SCCDA, CDA

• 4 Steps

• Pre, II, DE, Post

• High Consequence Area

• Reference

• NACE SP0502

• ASME/ANSI B31-8S

TRIMP

NEW

• BILL 112HR2845

• Evaluate need outside HCAs

• 76 FR 53086

• Advanced Notice of

Proposed Rulemaking

• RIN 2137-AE72

DIMP

CFR 49, Part 192, Subpart P

• Have a plan

• 7 Elements 1. Know the system

2. Identify threats

3. Evaluate and rank groups

4. Identify and implement measures to

manage the risk

5. Measure and monitor the results

6. Evaluate and improve the program

7. Reports to government agencies

ECDA

• Preassessment

– Gather info

– Make plan

• Indirect Inspection

– Survey

• Direct Examination

– Excavate

• Post Assessment

– Evaluate process

Surveys

CIS

Close Interval Survey

Close Interval Potential Survey

CIS

CIS

CIS

Surveys

DCVG

Direct Current Voltage Gradient

DCVG

DCVG

DCVG

Surveys

ACVG

Alternating Current Voltage Gradient

ACVG

ACVG

ACVG

ACVG

Surveys

ACA

Alternating Current Attenuation

PCM

Pipeline Current Mapper

(RadioDetection)

PCM or ACA

PCM or ACA

Surveys

Location

Depth of Cover

Location

conductive

Pipe

Transmitter Receiver

Location

inductive

Pipe

Transmitter Receiver

Location

Surveys

Soil Resistivity

Wenner Four-Pin

Soil Resistivity

a

r = 2 p a R

a a

P1 P2 C1 C2

Resistivity

Test

Instrument

Soil Resistivity

Surveys

GPS

Global Position System

Global Positioning Satellites

GPS

GPS

GPS

GPS

GPS

CIS

ON/OFF

CIS

ON/OFF/Static

CIS

ON/OFF/Static

CIS

Sawtooth

CIS

Exceptions

CIS

Waveprint

PCM

DCVG / ACVG Calculations and Classification

GPS

Post-Process

GPS

Maps

GPS

Maps

GPS

Maps

GPS

Alignment

GPS

Soil Res / Depth / DCVG / PCM

Recommendations

Dig Here

TRIMP vs DIMP

TRIMP

• Follow rules

• Defining regions

• As system exists

– Shorted

– Passivation/immunity

• Required digs

– Several categorized immediate

• Deadlines (12/17, replacement)

• Changing tools – changing regions

DIMP vs TRIMP

DIMP

• Regions or considerations

• Shorted system

• Redefining Immediate

• Changing tools

• Deadlines

• Selecting digs

Where to Dig?

DIMP

PURPOSE?

Bad areas on your pipe

• Deficient CP

• Stray current

– Foreign operators

– Transit system

• 3rd party damage

• Specific other

• Unknown

• GPS, GIS, Maps

DIMP

CONSIDERATIONS

• Paved areas

– Small skips

– Offsets

• Hybrid systems

– Focus on trends

– Incorporate IR considerations

• Interference testing

• What data do you want/need

The End

Questions?