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
7
(No Transcript)
8
(No Transcript)
9
(No Transcript)
10
ANSI Gas Piping Technology Committee ANSI
B31.8SIntegrity Management Process.
11
High Consequence Area The Real World
12
Integrity Assessment Methods

• Smart pig
• Pressure test
• Direct assessment
• 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?

27
(No Transcript)
28
Ultimate Goal
29
(No Transcript)