Pre Insulated Pipe

Outer protection pipe

Density (kg/m3 )

CJ/T114-4.2.3.1

≥940

948.2

Elongation at break (%)

CJ/T114-4.2.3.4

≥350

618

Tensile yield strength (MPa)

CJ/T114-4.2.3.4

≥19

20.5

Longitudinal shrinkage rate (%)

CJ/T114-4.2.3.5

≤3

1.23

Long term Mechanical properties

CJ/T114-4.2.3.6

>1500h(80℃,4.0 MPa)free from damage

Pass

The difference of the melt flow rate (g/10min)

CJ/T114-4.2.3.2

≤0.5

0.11

Carbon Black Content %

CJ/T114-4.2.3.1

2.5±0.5

2.4

Polyurethane insulation layer

Density (kg/m³)

CJ/T114-4.3.2

≥60

71.1

Average pore size (mm)

CJ/T114-4.3.1

≤0.5

qualified

Percentage of close area(%)

CJ/T114-4.3.1

≥88

94

Compressive strength(MPa)

CJ/T114-4.3.3

≥0.3

0.58

Water absorption(%)

CJ/T114-4.3.4

Immersion in boiling water 90 minutes, bubble water absorption should be not more than 10%

≤5.53

Working steel pipe

Seamless steel pipe(≤DN150)

GB8163

20#

qualified

Spiral steel pipe(≥DN200)

GB/T9711 or SY/T5037

Q235B

qualified

Length

5.8m-12m, or by customer's requirements

Nominal diameter

DN25-1800

Laid way

Buried

Application

Fluid Pipe, Natural gas, Gas, Oil, Hydraulic, chemical, drill, etc.

Production Standard

The national standard GB/T29047-2012, CJ/T114-2000, CJ/T155-2001