HDPE underground pipe for mining
This HDPE mining pipe is suitable for coal mine underground water supply, drainage, shotcrete, and gas extraction.It is a single solid wall pipe, it adopts CNT-modified material with DHPI’s self-owned patent product. To replace traditional material, the CNT has high electricity conduct features and only uses a 30% carbon black conductive agent, antistatic and flame resistant ability performs higher than MT181 standard which is far above traditional material. Especially in long-term hydrostatic performance, CNT material proved to have better safety and longer durability.

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HDPE Pipe For Mining 

Specifications:

Nominal outside diameter
dn/mm
Nominal wall thickness en mm
Standard size ratio
SDR21SDR17SDR13.6SDR11
Nominal pressure MPa
0.81.01.251.6
32


3.0
403.7
504.6
634.75.8
754.55.66.8
904.35.46.78.2
1105.36.68.110.0
1256.07.49.211.4
1406.78.310.312.7
1607.79.511.814.6
1808.610.713.316.4
2009.611.914.718.2
22510.813.416.620.5
25011.914.818.422.7
28013.416.620.625.4
31515.018.723.228.6
35516.921.126.132.2
40019.123.729.436.3
45021.526.733.140.9
50023.929.736.845.4
56026.733.241.250.8
63030.037.446.357.2

Mechanical properties

No.
ItemIndex
1Hydraulic TestTest conduct under MT558.1-2005, PE80 hoop stress 9.0Mpa, PE100 hoop stress 12.0 Mpa. Keep for 100 hours, pipe no fracture & no leakage. 
2Negative pressure resistance testTesting negative pressure 0.097 Mpa, keeping 100 hours. Pipe performs no damage or transformation.
3Flat PeopertyPipe inner side being pressed to flat, the entire body no crack or damage. 
4Falling weight impact testTest conduct under MT558.2-2005, 9 of 10 pipes no crack or damage.
5Elongation at break≥ 300%
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

 No..ItemIndex
1Surface Resistivity 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.
2Alcohol 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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