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Insulation elbow
Widely used in the urban centralized heat supply, warm room, coal, petroleum, chemical and other industries’ anti-corrosion insulation work.
Degrees:30°,45°,60°,90°
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
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 |
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 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 |
Inner tube specification(mm) | Outer tube specification(mm) | Arm length of the elbow(mm) | ||
R =1.5 | R=2.5D | R=3.0D | ||
DN100 | φ200×3.2 | 500 | 1000 | 1000 |
DN125 | φ225×3.5 | 800 | 1000 | 1000 |
DN150 | φ250×3.9 | 800 | 1000 | 1000 |
DN200 | φ315×4.9 | 1000 | 1000 | 1000 |
DN250 | φ365×5.6 | 1000 | 1000 | 1000 |
DN300 | φ420×7.0 | 1000 | 1200 | 1200 |
DN350 | φ500×7.8 | 1000 | 1400 | 1400 |
DN400 | φ560×8.8 | 1000 | 1500 | 1500 |
DN450 | φ600×8.8 | 1000 | 1600 | 1700 |
DN500 | φ655×9.8 | 1200 | 1800 | 2000 |
DN600 | φ760×11.5 | 1200 | 2000 | 2200 |
DN700 | φ850×12.0 | 1500 | 2300 | 2500 |
DN800 | φ960×14.0 | 1500 | 2500 | 2700 |
DN900 | φ1055×14.0 | 1800 | 2900 | 3000 |
DN1000 | φ1155×14.0 | 1800 | 3000 | 3300 |
DN1200 | φ1380×16.0 | 2000 | 3500 | 4000 |
High quality polyurethane insulation Elbow