Stress Corrosion Cracking Overview - PowerPoint PPT Presentation

Loading...

PPT – Stress Corrosion Cracking Overview PowerPoint presentation | free to download - id: 690b85-YTJiN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Stress Corrosion Cracking Overview

Description:

Stress Corrosion Cracking Overview & Introduction David Johnson December 2, 2003 – PowerPoint PPT presentation

Number of Views:154
Avg rating:3.0/5.0
Slides: 28
Provided by: djohnso
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Stress Corrosion Cracking Overview


1
Stress Corrosion CrackingOverview Introduction
  • David Johnson
  • December 2, 2003

2
SCC History
  • Not a recent phenomenon
  • Not exclusive to pipelines
  • Not confined to underground environment
  • Not geographically limited
  • Ammonia cracking of cartridge brass
  • Chloride cracking of stainless steel

3
Requirements for SCC
4
SCC Characteristics
5
SCC Characteristics
6
SCC near Seam Weld
7
Metallography of SCC
8
Summary of Incident Causes
9
Summary of Significance
  • Natural gas transmission(1985-2002)
  • 15 of 1415 total reported incidents
  • Liquid transmission (PPTS)
  • 5 of 472 in database
  • NEB (Canada) (1992-2002)
  • 3 of 23
  • None since 1995
  • Overall - about 1 of incidents

10
Why Todays Interest?
  • Other, higher significance threats also being
    addressed

11
Other Threats (B31.8S)
  • External Corrosion
  • Internal Corrosion
  • Manufacturing Defects
  • Welding Fabrication Defects
  • Equipment Failure
  • Third Party / Mechanical Damage
  • Incorrect Operations
  • Weather Outside Force

12
External Internal Corrosion
  • CP systems
  • Gas quality standards and monitoring
  • Relatively mature ILI capability
  • Correlated to hydro-test capability
  • Rapidly maturing DA capabilities

13
Manufacturing Construction
  • Specifications - materials construction
  • Advances in materials technology
  • Mill inspections
  • Construction inspections
  • Proof testing

14
Third Party Damage
  • Dig Safety
  • Common Ground Alliance
  • One Call enforcement
  • Enhanced public awareness

15
Incorrect Operation
  • Operator Qualification programs
  • Qualification of controllers
  • OQ-2
  • B31Q

16
Equipment Failure
  • Gaskets, Seals, Valves, Pumps, etc.
  • Generally not pipe
  • Generally confined
  • Specifications, testing, maintenance

17
Weather Outside Forces
  • Design Construction
  • Forecasting
  • Monitoring
  • Better understanding of material responses

18
Why Todays Interest?
  • Other, higher significance threats also being
    addressed
  • Less apparent understanding
  • Small, but widespread, occurrence
  • Methods of addressing not as mature
  • Inspection, characterization, assessment,
    management

19
Todays Workshop
  • Share available information
  • Understand application of current management
    techniques
  • Update on RD
  • Future Needs
  • Technology development
  • Regulatory approach

20
Managing SCC
  • Operators have found managed SCC
  • Tools as prescribed in PLSIA of 2002
  • In-Line Inspection
  • Hydrostatic Testing
  • Direct Assessment
  • Other
  • All have specific capabilities limitations
  • Gas - Liquid Pipeline Differences

21
Major Challenges
  • Finding SCC
  • Shallow cracks initially
  • May not be visible to unaided eye
  • Gas - Liquid technology differences
  • Service disruptions
  • Water disposal
  • Assessing what is found
  • Mitigation and Management

22
Research Development
  • Multi-faceted approach
  • Environmental factors
  • Surface preparation coatings
  • CP system operation
  • Operational factors
  • Material behavior
  • Detection sizing

23
Regulatory Response
  • Determining reasonable response
  • Setting investigation protocols
  • Communication needs

24
Upcoming Panels
  • Operator Experience with Finding and Managing SCC
  • TransCanada
  • Enbridge
  • Kinder Morgan
  • Duke
  • Williams
  • Colonial

25
Upcoming Panels
  • R D
  • Whats been done
  • Current work
  • Future needs
  • PRCI
  • ILIA
  • NACE

26
Upcoming Panels
  • Regulators
  • Concerns Needs
  • NEB
  • EUB
  • MNOPS
  • USDOT-OPS

27
Contacts
Dave.L.Johnson_at_Enron.com KLeewis_at_PRCI.org
About PowerShow.com