Pipeline Girth Weld Joints

Introduction

It is a kind of special-purpose pipe connection, which is made by embedding specific electric heating melt welding wire in the basis of high quality PE sheet with special technicals.
Mainly used for Oil&thermal pipeline, such as Pre-insulated Pipes.

Aplication Scope

1.District heating system(pipe),district thermal heating;
2. Steel pipes of anticorrosion;
3. Preinsulated bonded pipe system for directly buried hot water networks;
4. Three PE/PP layers with foam jacket insulations pipes connections;
5. Sewer lines instruction.(mental spirally reinforced corrugated pipe);
6. Water supply network; drainage pipes network;
7. Oil & gas pipeline(tubing);

8. Used for joint of Pre-insulated Pipeline, HDPE double-wall corrugated pipes.

Advantages

1. Waterproof;

2. Able to withstand axial forces initiated by axial moments of the pipe in the ground;

3. Able to withstand radial forces and bending forces;

4. Able to withstand effects of temperature and temperature variatations.

5. Have the same thickness of the pipeline insulation layer.

6. Perfect product instead of Heat Shrinkable Sleeve.

Specifications

Pipeline size: from Ø 108 to Ø 1760mm

Wrap Thickness: 4mm—12mm

Sleeves width:100mm,150mm,200mm,300mm,450mm,

500mm,600mm,700mm,800mm

Standard by EN253-2003,ISO1183-2004,ISO6964-1986,EN728-1997

Testing program

Required technical

Test Result

Result

Raw Material Density

≥0.935g/m3

0.961

Pass

Melt Flow Rate

≤0.50g/10min

0.46

Pass

Appearance

Both surfaces are clean and free from other defects.

Pass

Pass

Heat Reversion

≤3%;shall not show any cracks

0.89,No cracks

Pass

Tensile strength

≥19Mpa

20.2Mpa

Pass

Break Elongation

≥350

672

Pass

Stress crack resistance

≥300

Pass

Pass

Hydraulic pressure test

20°C,0.1Mpa water pressure, no damage and leakage after 1 hour

Pass

Pass

Air leakage test

20°C,0.1Mpa air pressure,no damage and leakage after 1 hour

Pass

Pass