# Presentation: 276697

## Stress Corrosion Cracking (SCC)

- Josef Kopec, P.Eng.

## First SCC Inquiry

- 1985-1992 one company 5 SCC ruptures
- First Inquiry 1993
- Considering current knowledge of SCC
- Concluded that SCC managed properly

**Notes:**
- TCPL experienced 5 ruptures between 1985 to 1992
this prompted the Board to conduct its first Inquiry
- The Inquiry examined the extent of the problem and
concluded that considering the current knowledge 
of SCC it was being managed properly

## SCC Inquiry 1996 

- Two ruptures in 1995
- Evidence SCC widespread on both gas and liquid pipelines
- Since 1977 - 22 failures
- 12 ruptures, 10 leaks
- Provide a forum to share                               SCC knowledge
- Knowledge shared around world

**Notes:**
-In 1995 TCPL experienced 2 more ruptures.  The last rupture
 occurred west of Ontario near Rapid City, Manitoba.  The area
 was deemed non-susceptible to SCC due to soil  conditions
-As knowledge of SCC increased along with research it became 
evident that SCC was widespread on both gas and liquid pipelines
- Board staff have made presentations to delegations from
 China, Italy, Argentina and Korea

## Inquiry Report Recommendations in 6 Key Areas

**Inquiry Report ****Recommendations in 6 Key Areas**

- SCC management program for all pipelines
- Changes to the design of pipelines
- Continued research
- Establishment of SCC database
- Improved emergency response practices
- Continued information sharing

**Notes:**
The inquiry Report has 27 recommendations which focused
in 6 key areas
- Companies submitted their management plans in July 1997
- CEPA submitted a 5 year research plan and some annual  
updates
- allowance for ILI tools passage and coating design and testing
- Research included,Testing Standards for Coatings, effect of
 residual stress and cyclic loading on SCC initiation and growth
- CEPA has  produced a Trending Report based on data gathered
 - companies were tasked to improve their emergency response
 practices and some companies have complied
- Industry shares information by supporting IPC, Banff WS and other similar forums

## Post-SCC Inquiry

- SCC Inquiry Report
- NEB SCC Liaison Group
- Community visits
- SCC Management Plans submitted by All NEB regulated companies & reviewed
- Meetings with numerous companies

**Notes:**
- SCC Inquiry Report was issued November 1996
- A liaison group was initiated to deal with all the  recommendations in the report CEPA/CAPP, CSA BC O&GC, AEUB & NEB
-Spring of 1997 went to 4 locations 3 in Ontario and 1 in 
 Manitoba which had experienced ruptures and met with any  
concerned citizens and spoke with first responders
-July 1997 companies submitted SCC management plans. 
Met with 4 major companies 3 of which had SCC and discussed the management plan approach to SCC

## NEB SCC Liaison Group

- Industry Groups and Regulators
- Monitor progress of implementation of recommendations
- SCC research - funding
- CEPA/CAPP SCC database & trending

**Notes:**
- SCC Liaison Group was formed to monitor the
implementation of recommendations progress
- Group meets two times a year and is a forum to
exchange information between pipeline associations
and regulators
- discusses progress of SCC research and the database trending

## Ongoing activities

- Qualitative Risk Ranking of Companies SCC Susceptibility
- SCC Management Plan Updates (1999)
- Company Meetings
- NEB SCC Liaison Group

**Notes:**
- in 1999 performed qualitative risk ranking of companies SCC plans based on industry failure experiences and required companies to submit management plan updates
- follow up meetings with companies
- two companies were required to perform engineering analysis (EA) of adequacy  of SCC management plans
- subsequent of EA’s, companies either ran an ILI tool or a predictive model
- both companies found SCC as a result of their revised m,management plans

## Canadian Energy Pipeline Association (CEPA) 2000 SCC Database Trending Report Results

**Canadian Energy Pipeline Association (CEPA)**** 2000 SCC Database Trending Report Results**

- note: physical inspection

**Notes:**
-Trending Report received data from all the CEPA companies and 2 non CEPA companies
- the length inspected is actual pipe that has been
day lighted
- the excavation locations included both opportunity
and targeted digs
- The board requires companies to report cases of significant SCC
- Significant SCC definition form CEPA Recommended Pratice

## Significant SCC Reported(December, 2003)

**Significant SCC Reported****(December, 2003)**

- Significant SCC reported to the NEB as per the requirements of Inquiry report

**Notes:**
- The NEB requires companies inform the NEB 
whenever a company finds significant SCC

## Plans and Priorities -SCC Integrity Issues

- Continue to meet with companies
- Continue to monitor incidents of SCC
- Integrate SCC Management with Integrity Management Plan audits

**Notes:**
- NEB will continue to monitor companies management of SCC and will continue to meet with companies.
- Goal is to include SCC monitoring in the IMP audits

## SCC in Perspective

**Causes of in-service pipeline ruptures: 1985-95**

**General Corrosion**

**Other**

**SCC**

- (**Geotechnical**  landslides, etc.)

**Contact **
**Damage**
- (contact by
- earth moving
- equipment, etc.)

**Notes:**
- NEB will continue to monitor companies management of SCC and will continue to meet with companies.
- Goal is to include SCC monitoring in the IMP audits

## On-going Integrity Issues

- SCC is one of many time dependent integrity concerns
- On going monitoring of:
-  ERW seam problem
- Corrosion -
- General, Narrow Axial                                                  External Corrosion,                                               Corrosion Fatigue
- Hard Spots

## Management of Integrity Issues

- Management system audits
- Require companies to perform Engineering Assessments
- Information sharing with other Regulators and Industry
- meetings
- conferences

## Common Goal

- NEB regulated facilities and activities are safe and perceived to be safe

## Copies of SCC Inquiry Report

- Regulatory Support Office
- National Energy Board
- (403) 292-4800