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PE Line Coating, Protection of girth welds

Sleeves & Liquids

Application

(99% of the cases in the world)

Heatshrink sleeves

–PE 3 layers
–PP 3 layers
–FBE
–PU
Liquids (Epoxy/PU)
–FBE
–PU

Mill-applied 

3 Layer Polyethylene coatings

PE Line Coating, Protection of girth welds

Technologies:
–Polyurethanes
–Epoxy
•Manual application or machine (Spray)
•Single or multiple passes to reach required thickness
PE Line Coating, Protection of girth welds
 
3 layers
–Epoxy
–Adhesive
–Polyethylene
•Replication of mill-applied 3-layer PE coating
•Factory made design/system
Function of the intermediate adhesive
Maximise the adhesion to:
Polyethylene (Mechanical Protection) & Epoxy (Corrosion Protection)
Good shear resistance
Sleeves
–Epoxy
–Adhesive
–Polyethylene
Reconstructs mill-applied coating performance
Liquids
Sole adhesive to bond to 4 materials:
–Steel
–Epoxy
–Adhesive

Polyethylene

PE Line Coating, Protection of girth welds

•Adhesion Epoxy-Metal: 20-30MPa (ISO = 10 MPa)
•Adhesion PU-Metal:10-15 MPa (ISO = 10MPa)
•Adhesion PU / Epoxy - PE

•Not compliant with ISO 21809-3

•Adhesion of Heat Shrinkable Sleeves on Steel is the same as Adhesion on PE
PE Line Coating, Protection of girth welds
 
cracks on interface

Line coating

determines the choice of girthweld protection.

Heat-Shrink

Sleeves

- PE 3 layers
- PP 3 layers
- FBE
- PU

Liquids (Epoxy/PU)

- FBE

- PU 

Heat-shrink Sleeves

•Surface Preparation
•Pre-heating
•Mixing and application of Epoxy
•Sleeve Application
•Shrinking (Torch)
•Dielectric Testing (identical voltage)

(Irrelevant of the ambient conditions)

Liquids

•Applicator Protection (Spray)
•Prepare equipment (Spray)
•Surface preparation
•Pre-heating (especially PE)
•Appropriate mixing
•Roll or Spray
•Check and build up thickness (3 x 500 microns)
•Polymerization & Protection
•Dielectric Test (different voltages)

(Ambient Conditions RH < 80% to avoid Blistering)

Pinholes are a consequence of entrapped air and moisture

PE Line Coating, Protection of girth welds

PE Line Coating, Protection of girth welds

Welds / day (48”) : 50 - 170 (0,6 - 2km)

Sleeves

–Surface preparation (4-5min)
–Crew of 4 people
–6 joints / hour
–60 joints / day / crew
–1 crew for +/-50 joints
–3 crews for 170 joints

Easy logistics

Liquids

–Surface preparation (4-5min)
–3 passes (1500 microns)
–3 to 4 minutes coating interval
–10 to 15 minutes / joint
–40 joints / day / crew
–1 crew for +/-50 joints
–4 crews for 170 joints
Complex logistics
(Machine – product – storage – pot life)

Planning is driven by welding cycle time

Diameter: 48” – Cutback: 150mm

Sleeves
HTLP80 EN12608-UV

– Overlap: 50mm
– Thickness: 2,8 – 3 mm
– 100 / joint

Liquids

Epoxy Powercrete R60 & R95

–Overlap: 100mm
–Thickness: 1000-1500 microns
–Wastage: 50%
–5 liters (8kg) / joint

6-10US$/kg: 100-160 / joint

Polyurethane

–Overlap: 100mm
–Thickness: 1500 microns
–Wastage: 50%
–6 liters (9,6kg) / joint

5-6US$/kg: 100-120 / joint

- Superior system: Adhesion to PE
- Compliant with international standards

- Does not cause delays (preference of contractors)

- Comparable budgets

This solution ensures the longest service life

Diameter: 48” – Cutback: 150mm

50 – 55 US$ / joint

Liquids

Epoxy Powercrete R60 & R95

–Overlap: 100mm
–Thickness: 1000-1500 microns
–Wastage: 50%
–5 liters (8kg) / joint

6-10US$/kg: 48-80US$ / joint

Polyurethane

–Overlap: 100mm
–Thickness: 1500 microns
–Wastage: 50%
–6 liters (9,6kg) / joint

5-6US$/kg: 48-58 US$ / joint

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