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  • Mining Steel Wire Reinforced PE Composite Steel Pipe

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Mining Steel Wire Reinforced PE Composite Steel Pipe
PRODUCT STRUCTURE
Polyethylene raw material -- Coal mine polyethylene material belongs to Donghong's own patented product - flame retardant and antistatic CNT-modified material, which is wrapped on both internal and external surfaces so that the color of the paint application is maintained permanently. This composite polyethylene material ensures that the flame retardant grade and antistatic grade of the pipe exceeds MT181grade and MT558.1 grade, and improves the mechanical properties of the material.
High Durable Steel Wire -- Adopting coopered steel wire under the requirement of GB/T 14450, achieve the pressure strength ≥2050Mpa.
Adhesive resin -- adopting Donghong's self-developed patented resin products, it excels in strong adhesion and process adaptability.

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Performance Characteristics


Mechanical properties

Serial Number
Item
Index
1
Short-term hydrostatic test
Testing conduct under C/T189-2007 requirement, temperature 20 ℃, liquid pipe 2.0 Mpa nominal pressure, gas pipe 3.2 Mpa nominal pressure, testing time 1 hour. All pipes no fracture & no leakage.
Testing conduct under C/T189-2007 requirement, temperature 80 ℃, liquid pipe 1.2 Mpa nominal pressure, gas pipe 1.92 Mpa nominal pressure, testing time 165 hours. All pipes no fracture & no leakage.
Testing conduct under C/T537-2019 requirement, temperature 60 ℃, 1.05 Mpa nominal pressure, testing time 165 hours. The pipe no fracture & no leakage.
2
Burst Pressure
Testing temperature 20 ℃, rise the pressure to burst in 60-70 seconds, the bursting pressure is ≥3 times of the nominal pressure.
3
Negative pressure resistance testTesting negative pressure 0.097 Mpa, keeping 100 hours. Pipe performs no damage or transformation.
4
Pressure cracking stabilityWhen press to 50% of nominal diameter in 10-15 seconds, the pipe doesn't crack or damage.
5
Peel strength
≥100N/cm
Note: Above performance is normalization requirements, in order to explain the standard of features. And the negative pressure resistance test only applicable to gas extraction pipe.


Flame retardant and antistatic properties

Serial numberItemIndex
1
Surface resistance
Water supply & drainage pipe: the arithmetic mean value of outer surface should ≤10x109Ω.
Positive pressure air pipe: the arithmetic mean value of outer surface should ≤10x108Ω.
Pipe for shotcrete: the arithmetic mean value of outer surface should ≤10x108Ω.
Negative pressure air pipe: the arithmetic mean value of outer surface should ≤10x106Ω.
Gas extraction pipe: the arithmetic mean value of outer surface should ≤10x106Ω.
2
Alcohol burner burningThe arithmetic mean value of flame burning time for 6 tested pipes should ≤3 seconds. Single pipe should ≤ 10 seconds.
The arithmetic mean value of flameless burning time for 6 tested pipes should ≤20 seconds. Single pipe should ≤ 60 seconds.


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