Coatings

1
Coatings Directional Boring

• Tim Jenkins

2
Coatings Directional Boring

• Design Considerations (data collection)
• Contributed coating failures
• Pre-Operation steps
• Post-Operation steps

3
Design Directional Boring Coatings

• Data Collection for coating selection
• Surrounding Environment
• Soil composite
• Location
• Foreign lines
• Other pipelines
• AC Transmission towers
• Timeframe

4
Design Directional Boring Coatings

• Powercrete
• 12 to 15 mils of FBE (Fusion bonded Epoxy) 3M
  6233
• Concrete polymer base outer coat 20mils per
  application, two applications normally used
• Typically 55 to 60 mils coating thickness
• FBE Dual coat
• 12 to 15 mils of 3M 6233
• 20 mils of a Dual coat application of 3M 6352
• Typically 35 mils total coating thickness

5
Design Directional Boring Coatings

• Time frame considerations
• Powercrete hand applied, 4 joints per 2 hours
  can be coated
• FBE Dual coat assembly line, 3000 feet in
  three hours

6
Design Directional Boring Coatings

• Durability
• Powercrete UV protected, more abrasive
  resistance in comparison to the FBE dual coat
• Recommended practice
• Abrasive environment use the Powercrete
  application,
• In well known normal soil application, FBE dual
  coat acceptable and probably more cost effective

7
Design Directional Boring Coatings

• Coatings Case history - Failures
• The most popular coating failure -
• Cathodic Shielding
• Rock formation
• Pipe wedge next to a rock formation at the point
  of coating holiday
• Disbondment coating
• Coating becomes disbondment from the surface of
  the pipe, but shields the CP from the surface of
  the metallic structure exposed under the coating

8
Cathodic Shielding - Rock
CP
CP
ROCK
Pipeline
CP
9
Cathodic Shielding Coating Disbondment
CP
Pipeline
CP
10
Design Directional Boring Coatings

• Coatings Case history - Failures
• Thickness of coating application
• The thicker of the coating, less durable, more
  brittle

11
Harlem RD Bore Coating Failure
12
Design Directional Boring Coatings

• Coatings Case history - Failures
• Powercrete
• Flexibility Degrees per pipe diameter
• 1.4 for 35 mils
• .75 for 55 mils
• FBE Dual Coat
• Flexibility Degrees per pipe diameter
• 2.8 for 35 mils

13
Design Directional Boring Coatings

• Coatings Case history Failures
• FBE Dual coat more flexible than Powercrete
• But,,,
• Powercrete more impact resistance than FBE

14

Design Directional Boring Coatings

• Powercrete application adhesive bond to the FBE,
  and the dual coat 3M will result of complete pull
  out of coating application from the metal surface
  due to, coating flexibility angle being too great
• In a normal pulling process, coating will be
  disbondment by layers and normally does not
  result in total removal

15

Design Directional Boring Coatings

• Girth Welds
• Two part Liquid Epoxy used
• Protal 7200 - 50 or greater
• Protal 7125 - 50 or less
• R95 Powercrete J (new)
• Pipe Preparation
• Sand blasting NACE 2 or SSPC-SP10

16
Northern Loop Hoover Bore Girth Welds
17
Design Directional Boring Coatings

• Transmission Class pipeline
• ECDA
• Pipe thickness design
• SYMS
• ICDA
• Internal Coupons
• Probes
• Inclination angle consideration
• Do not get greater than the Critical Inclination
  angle
• Inline Inspection smart pigging

18
Pre-Operation Steps

• Columbia Gas needs to inspect all coated pipe
  line at the coating mill before the pipe is
  coated
• Corrosion Technicians are being trained, KTA
  certified
• Communication should be placed to Corrosion FLL
  by Supply chain
• Need to consider cost of technician or coating
  inspector to work order budget

19
Corrosion Department InspectingPowercrete
application for Maumee River Crossing
20

Pre-Operation Steps

• Pipe Inspected in the field by the corrosion
  department
• Determine any coating defects due to shipment
• Pipe and girth welds coatings inspected in the
  field by the corrosion technicians
• Dew point readings
• Pipe Temperature
• Chloride check
• DFT
• WFT
• Observe Jeeping process recommend voltage
  setting

21
Post Operation Steps

• Survey Coating and CP
• CP
• CIS Close Interval survey
• External Coupons used
• Coating
• DCVG Direct Current Voltage Gradient
• ACVG PCM Alternate Current Voltage Gradient
• Cost of survey new steel pipe by corrosion
  department should be considered on the work order
  budget

22
Thank You Any Questions??