Compliance Verification Activity Report: CV2223-152 - Trans-Northern Pipelines Inc.


Compliance verification activity type: Field Inspection

Activity #: CV2223-152
Start date: 2023-02-27
End date: 2023-02-27


Regulated company: Trans-Northern Pipelines Inc.

Operating company: Trans-Northern Pipelines Inc.

Province(s) / Territory(s):


Related events:

Rationale and scope:

Integrity construction inspection for the TNPI Dorval Tunnel Relocation Project to verify compliance to the OPR and CSA Z662-19.

Compliance tool(s) used:

Facility details


Regulatory requirements

Regulatory requirements that apply to this activity:

Observations (no outstanding follow-up required)

Observation 1 - TNPI Dorval Tunnel Pipe Replacement Project

Date & time of visit: 2023-02-27 09:30

Discipline: Integrity Management




The CER inspector met with TNPI Dorval Tunnel Pipe Replacement Project representatives at the construction office located at the project site. A site-specific safety orientation was provided and the opening meeting was conducted.

The project is to replace a section of the pipeline located in a tunnel under highway 40, in Dorval, QC. The replacement pipe is 10-inch OD, 9.3 mm WT, Grade 359 Cat II. The pipe is coated with Fusion Bond Epoxy and an Abrasion Resistant Overcoat.

Stantec has been hired by TNPI to design and manage the project on behalf of TNPI.  Robert B. Somerville (RBS) is the contractor building the pipeline. TNPI has two on-site inspectors for the project.

The existing pipeline is still in service while the new replacement segment is being constructed. Stantec indicated that it reviewed and approved the contractor welding procedures that are used for this project. Part of the work is done in a fabrication shop where pipe joints are welded together to work with double joints at the construction site (the Dorval tunnel). Two double joints had been welded together and slid into the tunnel on pipe racks prior to this inspection.

The tunnel is considered a confined space. There was a rescue team on site. The rescue team monitors the quality of the air in the tunnel and controls the access to the tunnel. The rescue team supervisor explained the rescue procedure and provided a copy of it.

NDT Group Inc. (NDT) has been hired by Stantec to conduct the non-destructive examination (NDE) of the welds and to verify the welding parameters during the welding. NDT provides the welding inspection reports directly to Stantec and also informs the TNPI inspectors of the results.  The NDT inspectors conducting the NDE (RT, UT, and MPI) had valid CGSB certifications. Stantec confirmed that 100% of the welds receive NDE on their entire circumference.

The second field weld with the third double joint was completed on the day of the inspection. The welding is done at the entrance of the tunnel. The NDT welding inspectors were verifying the welding parameters as the weld was being completed. They explained that the parameters are verified for all welds. The results of the welding inspection for the weld completed during the CER inspection confirmed that the welding procedure was followed.

The field-applied coating is a two-part epoxy (SP-2888). The contractor conducts the QA/QC activities for the field coating applications, which are witnessed by the TNPI inspectors. The TNPI inspectors also sign off on the coating inspection reports. The contractor coating inspector has a NACE CIP Level II certification. The qualification records for the coating applicators were provided. The coating inspector indicated that he conducts the QA / QC tests required by CSA Z245.30

The NDE inspector conducted radiographic testing of the welds while the CER inspector was on site. The NDE inspector presented the results and confirmed that the weld was acceptable.

The material testing records were provided for the pipe being welded during the inspection.

No non-compliances were identified for this inspection.

Compliance tool used: No compliance tool used

Observations (company follow-up required)

Identified non-compliances to company plans or procedures are non-compliances either to:

- the condition of an authorization document that requires the implementation of that plan or procedure; or

- the relevant section of the regulations that requires implementation of that plan or procedure including those sections that require implementation of plans or procedures as a part of a Program