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Philip Sher Connecticut Department of Public Utility Control Gas Pipeline Safety Unit

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Direct Assessment Philip Sher Connecticut Department of Public Utility Control Gas Pipeline Safety Unit Representing NAPSR National Association of Pipeline Safety ... – PowerPoint PPT presentation

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Title: Philip Sher Connecticut Department of Public Utility Control Gas Pipeline Safety Unit


1
Philip Sher Connecticut Department of Public
Utility Control Gas Pipeline Safety Unit
Direct Assessment
  • Representing
  • NAPSR
  • National Association of Pipeline Safety
    Representatives
  • November 4, 2003

2
NAPSR
  • NAPSR National Association of Pipeline Safety
    Representatives
  • non-profit organization
  • state pipeline safety directors, managers,
    inspectors and technical personnel
  • to support, encourage, develop and enhance
    pipeline safety regulation
  • Founded on December 2, 1982

3
Integrity Management Program
  • Pipeline IMP
  • a plan or system to handle or direct with a
    degree of skill the soundness of a pipeline
    system

4
We Need Integrity Management
Bellingham, WA
Carlsbad, NM
Edison, NJ
5
We Will Have Integrity Management
6
Steps in Risk Management
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10
ANSI Gas Piping Technology Committee ANSI
B31.8SIntegrity Management Process.
11
High Consequence Area The Real World
12
Integrity Assessment Methods
  1. Smart pig
  2. Pressure test
  3. Direct assessment
  4. Other (new technology)

13
Smart Pigs
  • 1st smart pigs mid 1960s, primarily for the
    detection of wall thinning. Now other types of
    defects - cracks, coating disbondment, dents and
    gouges - are detectable
  • Smart pig digs have served to calibrate and
    validate smart pig results

14
Smart Pigs
  • Smart pigs need
  • launchers receivers
  • long radius bends
  • full opening valves
  • constant pipe diameter
  • Smart pigs may require interruption
  • 25-30 of transmission pipelines are piggable

15
Pressure Testing
  • Require taking pipeline out of service
  • Water removal can be difficult
  • Water can promote internal corrosion
  • Pressure testing can grow subcritical flaws into
    critical flaws
  • Pressure test provides limited information and
    limited evaluation of future performance

16
Direct Assessment
  • ECDA External Corrosion Direct Assessment
  • ICDA Internal Corrosion
  • Direct Assessment
  • SCCDA Stress Corrosion Cracking Direct
    Assessment

17
ECDA 4 Step Process
  • Step 1 - Pre Assessment
  • Step 2 - Indirect Examination
  • Step 3 - Direct Examination
  • Step 4 - Post Assessment

18
Direct Assessment
  • Absolute need for DA
  • MUST be perfected
  • Must define parameters where it works
  • Must define parameters to evaluate it in use
  • Must develop body of knowledge and talent to
    utilize DA

19
Tools of ECDA
  • Cathodic Protection Readings (CP)

20
Tools of ECDA
  • Close Interval Survey (CIS)

21
Tools of ECDA
  • Direct Current Voltage Gradient (DCVG)

22
Tools of ECDA
  • C-Scan (The C-Scan mode or pulse-echo provides a
    planar view image at a specific depth.
    Illustrations of delaminations and void formation
    can be generated.)

23
Tools of ECDA
  • Current Mapper

24
Direct Assessment
  • Some DA tools are old and there is considerable
    experience
  • Some DA tools are new with little experience
  • The DA process is new incorporating old and new
    tools, old and new techniques, and significant
    new data integration and documentation

25
Direct Assessment
  • Just as smart pig needed calibration and
    verification, DA will also need to be proven for
    the many conditions
  • that may exist.
  • DA must be repeatable
  • DA must have a high level of confidence
  • Operator must demonstrate compliance
  • Regulator must confirm compliance

26
Reassessment Period
  • Original proposed reassessment period
  • Final reassessment period?

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Ultimate Goal
29
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