WELDING PROCEDURE SPECIFICATION No. EPI-11- WP10 BW Rev. 1 Dec. 20, 2011

Company: Enbridge Pipelines Inc., PO Box 398, 10201 Jasper Avenue, Edmonton, AB T5J 2J9 Scope: This welding procedure specification details the procedure to be followed for production Back-Weld

Repairs of pipe and/or components as required by CSA Standard Z662-11 Oil and Gas Pipeline Systems.

Service Restrictions: Sweet or Sour Temperature Restrictions: Notch Toughness Tested to -5°C (23°F)

1. WELDING PROCESS & METHOD

Shielded Metal Arc Welding (SMAW) - Manual Method

2. JOINT GEOMETRY

a) Joint Type: Groove – Ground into existing weld metal. Depth of groove shall not exceed 1.6 mm (0.062 in.)

The surfaces to be welded shall be smooth, uniform, free of fins, laminations, tears, scale, slag, grease, paint or other foreign matter, which may adversely affect the welding.

3. BASE MATERIAL

a) Composition: This specification applies to pipe and/or component material manufactured in accordance with, or listed as “Acceptable Alternative Materials” in any of the following standards:

CSA Z662, Oil and Gas Pipeline Systems CAN/CSA-Z245.1 Steel Line Pipe CAN/CSA-Z245.11, Steel Fittings CAN/CSA-Z245.12, Steel Flanges CAN/CSA-Z245.15, Steel Valves

b) Material Grades 483 MPa (SMYS) or less c) Wall Thickness Qualified: 4.0 to 27.8 mm (0.157 to 1.10 in.) inclusive d) Pipe Diameter Qualified: 457 mm (18 in.) OD minimum e) CSA Carbon Equivalent: 0.32 maximum for >Gr.386 (SMYS)

4. FILLER METAL CLASSIFICATION & SIZE

a) Back Weld: E8018-C3; 2.4 mm (3/32 in.)

5. POSITION & DIRECTION OF WELDING

a) Position: All positions b) Direction of Welding: Vertical Up

Welding Procedure EPI-11-WP10 BW Rev. 1

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6. PREHEATING, INTERPASS TEMPERATURE & CONTROLLED COOLING

a) Repair Welds: A minimum preheat temperature of 125°C (257°F) shall be applied to an area of at least 150 mm (6 in.) from any point to the area to be repaired.

b) If the interpass temperature falls below the minimum preheat temperature, the entire weld joint shall be heated to the minimum preheat temperature prior to starting the next weld pass.

The maximum interpass temperature shall not exceed 204°C (400°F).

Preheating may be applied by oxy-fuel torch, propane torch, electrical induction coils or any other method approved by Enbridge.

Preheat temperature shall be checked using temperature indicating crayons, thermocouple pyrometers or other suitable method approved by Enbridge to determine that the required preheat temperature is obtained prior to, and maintained during the welding operation.

Where applicable, precautions shall be taken through the use of insulating covers or other means to control the cooling rate of the weld after any pass.

7. POST WELD HEAT TREATMENT

Welds prepared in accordance with this specification shall not be subjected to post-weld heat treatment.

8. ELECTRICAL CHARACTERISTICS

a) Current Type: Direct Current, Reverse Polarity (DCRP) b) Amperage, Voltage and Travel Speed: See TABLE # 1 c) Heat Input: See TABLE # 1

9. TECHNIQUE

a) Minimum number of root & hot pass welders: One b) Stringer or Weave Bead: String or Weave c) Number of Weld Layers: One layer c) Cleaning methods: Hand or power tools may be used. Each pass shall be thoroughly cleaned and

free of slag and scale prior to depositing the next weld layer. The completed weld shall be brushed and free of spatter.

d) Filler and Finish Beads and Finish to be Achieved: Weld repairs shall be completed in a full operation without stopping. The completed welds shall have a substantially uniform cross-section for it’s entire circumference. The crown of the weld shall not be below the surface of the adjacent base material.

10. REMOVAL AND REPAIR OF DEFECTS

Repairable defects shall be removed by grinding. The minimum length of any repair shall be 50.8 mm (2.0 in.). Welding shall be performed following the details outlines in this specification.

Welding Procedure EPI-11-WP10 BW Rev. 1

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11. ATTACHMENTS a) Procedure Qualification Test Records: EPI-11-WP-10 b) Laboratory Test Reports: E11-1117.4 c) NDT Examination Results: RTD RT Report No. PS12805 d) Material Test Report: PCK Heat Number 11201828

TABLE # 1 WELDING PARAMETERS

Bead Number

Electrode Welding

Progression Amperage

Range Voltage Range

Travel Speed mm/min (in./min)

Heat Input J/mm (J/in.)

Size mm (in.)

AWS Class

Back Weld

2.4 (3/32) E8018-C3 Vertical Up 74 – 118 17 – 26 158 – 292 (6.2 – 11.5) 0.40 – 0.75

(10,120 – 18,997)

PQR # EPI-11-WP-10 BW ELECTRODE

DATE

WELDERS Kevin O'Brien E8018-C3 Fill & Cap

Brooks Aitken POWER SUPPLY Not Available

BASE MATERIAL CSA Z245.1

PIPE GRADE 483 Cat. 1 POLARITY Direct Current, Reverse Polarity

PIPE MANUFACTURER PCK

HEAT # 11201828 NOTES:

CSA Z662 CARBON EQUIVALENT 0.27 Weld Parameters sampled per full length completed

DIMENSIONS NPS 36" X 22.2 mm Preheat checked - Contact Thermocouple, Tempil Stick, IR Thermometer

WELDING PROGRESSION Uphill Interpass Cleaning, Grind or Powerbrush as required

POSITION 5G

PRE HEAT / MIN INTERPASS 149°C minimum

MAX INTERPASS 205°C maximum

WELD PARAMETERS

Preheat

(Celcius)

in. mm High Low High Low Distance Time (s) IPM Celcius High Low

Bead-T E8018-C3 3/32 2.4 #VALUE! #DIV/0!

Bead-B E8018-C3 3/32 2.4 #DIV/0! #DIV/0!SEE LUDWIG DATA SHEETS

Heat Input (KJ/mm)

Class

Diameter

Pass

Electrode Voltage Amperage Travel Speed

ENBRIDGE PROCEDURE QUALIFICATION TEST REPORT

17-Nov-11

JOINT DESIGN

Joint Geometry and Fit-Up Joint Completetion and Pass Sequence

BlueShield LA8018-C3 (Lot24570319

Back Weld Excavation

~1.6mm

~1.6mm Back Weld

~3.2mm

~4.0mm

ENBRIDGE PIPELINES INC. Weld Parameter Calculations

Weld PQR: EPI-11-WP-10 BWPass Class Size (mm) Amperage Voltage mm/min in/min kJ/mm J/inch

Root-T E8018-C3 2.4 92 22.0 243 9.6 0.50 12,650 Heat Input Calculated by using:

Root-B E8018-C3 2.4 98 21.0 197 7.8 0.63 15,831

Hot-T Average Recorded Amps x Average Recorded Volts x 60

Hot-B

Fill-1-T

Fill-1-B

Fill-2-T

Fill-2-B

Fill-3-T

Fill-3-B

Fill-4-T

Fill-4-B

Fill-5-T

Fill-5-B

Cap-1-T

Cap-1-B

Class Size (mm) Minimum Maximum Minimum Maximum

ROOT E8018-C3 2.4 74 118 17 26 158 292 6.2 11.5 0.40 0.75 10120 18997

HOT 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

FILL-1 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

FILL-2 0 0.0 0 0 0 0 0 0 2.0 0.0 0.00 0.00 0 0

FILL-3 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

FILL-4 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

FILL-5 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

CAP-1 0 0.0 0 0 0 0 0 0 0.0 0.0 0.00 0.00 0 0

Actual Arc Speed

PROCEDURE QUALIFICATION RECORD-WELDING PARAMETERS VALUES-MANUAL SMAW WELDING

Insert Actual

Values Here

CSA Tolerance

Amps,Volts &

Arc Speed,

Heat Input; +/-

20%)

Weld Pass

Electrode Amperage Voltage

Arc Speed Heat Input

Minimum

(mm/min)

Maximum

(mm/min)

Minimum

(in/min)

Maximum

(in/min)

Minimum

(kJ/mm)

Maximum

(kJ/mm)

Minimum

(J/inch)

Maximum

(J/inch)

Electrode Arc Speed Heat Input

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