large-diameter polyurethane foam insulated underground insulation pipe fitting elbow

Composition

1.steel pipe

2.polyurethane insulation

3.high-density polyethylene

Usage

1.district heat and cold supply

2.warm room

3.coal mine

4.petroleum

5.chemical and other anti-corrosion insulation field

Angles

Medium

teperature

50°C—120°C,max140 °C

Working

pressure

<2.5Mpa

Laying

method

1.direct bury

2.built on stilts

3.trench

Technology

1.Advanced Corona treatment

2.Impeller blasting

3. Leakage alarm line

Standards

GB/T29047-2012,EN253,EN448,EN489

Advantages

1.good insulation properties ,low heat loss

(the 25% of traditional pipes),

2.energy saving

3.waterproof and corrosion resisdence

4.no trench,be directly buried in ground or water

Performance products

Reference standard

Standard request

Outer protection tube

Density(kg/m³)

EN253-4.3.1.1

CJ/T114-4.2.3.1

≥944

≥940

Carbon black content(%)

EN253-4.3.1.1

CJ/T114-4.2.3.1

2.5±0.5

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

EN253-4.3.1.2

CJ/T114-4.2.3.2

≤0.5

Tensile yield strength(MPa)

CJ/T114-4.2.3.4

≥19

Elongation(%)

EN253-4.3.2.5

CJ/T114-4.2.3.4

≥350

Longitudinal reversion(%)

EN253-4.3.2.6

CJ/T114-4.2.3.5

≤3

Long-term mechanical properties

EN253-4.3.2.7

CJ/T114-4.2.3.6

1500h(80°C/4.0Mpa)No damage

Polyurethane foam

Density(kg/m³)

EN253-4.4.3

CJ/T114-4.3.2

≥60

Average pore diameter(mm)

EN253-4.4.2

CJ/T114-4.3.1

≤0.5

Obturator rate(%)

EN253-4.4.2

CJ/T114-4.3.1

≥88

Compressive strength(MPa)

EN253-4.4.4

CJ/T114-4.3.3

≥0.3

Thermal conductivityW/(m.K)

EN253-5.4.5

CJ/T114-4.3.5

≤0.033

Water absorption

EN253-4.4.5

CJ/T114-4.3.4

Immersion in boiling water for 90 minutes, the water absorption of not more than 10% of the original volume

Insulation products

Exposed section of steel pipe end(mm)

EN253-4.5.1

CJ/T114-4.4.1

≥150

Increase the rate of outer protection tube diameter(%)

EN253-5.4.1

CJ/T114-4.4.2

≤2

Axis eccentricity

EN253-4.5.3

CJ/T114-4.4.3

See4.5.3items

Life(120°C)

EN253-4.5.4.1

CJ/T114-4.4.4.1

30years

Shear strength(MPa)

EN253-4.5.4.2

CJ/T114-4.4.4.2

≥0.12(23±2°C)

≥0.08(140±2°C)

Impact resistance

EN253-4.5.6

CJ/T114-4.4.5

See4.5.6items