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Widely used in the urban centralized heat supply, warm room, coal, petroleum, chemical and other industries’ anti-corrosion insulation work.
Medium temperature: 50°C—140°C
Operating pressure: <1.6Mpa
Laid way: Buried, overhead, trench
Derusting grade of the steel tube: GB/T9823-1988, Sa2.5
Grade of the steel pipe and pipe fitting: 20#/Q235 Seamless steel pipe and spiral steel pipe (GB and oil standard)
Insulation material: Fluoride-Free water foamed rigid polyurethane foam material (foam density: 60kg/m3-80kg/m3
Inner surface treatment of the high density polyethylene pipe:corona treatment
Inner surface tension of the high density polyethylene pipe:≥50dy/cm
If Transmission hot water, It has leakage alarm line in the insulation layer warning the position and the degree of the leakage on the instrumentation.(Check below picture)
Reference standard
CJ/T114-2000——high density polyethylene pipe and prefabricated directly buried insulation pipe;
CJ/T155-2001——high density polyethylene pipe and prefabricated directly buried insulation pipe fittings;EN253:2003——insulation pipe made by the inner steel tube,polyurethane insulating layer and high density polyethylene pipe;
GB/T9711.1-1997——Steel pipe for oil and gas industry technical delivery conditionsGB/T8163-1999——seamless steel pipe for Conveying liquidperformance index:
Work steel | ||
Specification(mm) | Type | Reference |
<DN200 | seamless steel | GB/T8163 |
≥DN200 | Spiral welded steel pipe | GB/T9711.1 |
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 |
Close cell 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 conductivity/(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 |
Specifications (mm) | OD ×Thickness (mm) | Outer protection tube diameter ×Wall thickness (mm) | Insulation thickness (mm) | Unit weight Kg/m |
32/90 | 32×2.8 | 90×2.5 | 26.5 | 3 |
45/110 | 45×2.8 | 110×2.5 | 30.0 | 4 |
57/120 | 57×3.0 | 120×2.5 | 29.0 | 6 |
60/125 | 60×3.5 | 125×3.0 | 29.5 | 7 |
76/140 | 76×4.0 | 140×3.0 | 29.0 | 9 |
89/160 | 89×4.0 | 160×3.0 | 32.5 | 11 |
108/180 | 108×4.0 | 180×3.0 | 33.0 | 13 |
133/200 | 133×4.5 | 200×3.2 | 30.3 | 17 |
159/250 | 159×4.5 | 250×3.9 | 41.6 | 22 |
219/315 | 219×6.0 | 315×4.9 | 43.1 | 39 |
273/365 | 273×6.0 | 365×5.6 | 40.4 | 49 |
325/420 | 325×7.0 | 420×7.0 | 40.5 | 67 |
377/500 | 377×7.0 | 500×7.8 | 53.7 | 81 |
426/560 | 426×7.0 | 560×8.8 | 58.2 | 94 |
478/600 | 478×7.0 | 600×8.8 | 52.2 | 104 |
529/630 | 529×7.0 | 630×9.8 | 40.7 | 114 |
529/655 | 529×7.0 | 655×9.8 | 53.2 | 117 |
630/760 | 630×8.0 | 760×11.5 | 53.5 | 158 |
720/850 | 720×8.0 | 850×12.0 | 53.0 | 181 |
820/960 | 820×10.0 | 960×14.0 | 56.0 | 252 |
920/1055 | 920×10.0 | 1055×14.0 | 53.5 | 281 |
1020/1155 | 1020×10.0 | 1155×14.0 | 53.5 | 312 |
1220/1380 | 1220×12.0 | 1380×16.0 | 64.0 | 444 |
1420/1602 | 1420×14.0 | 1602×16.0 | 75.0 | 590 |
prefabricated heat insulation steel pipe