Underground Coal Mining PE Pipeline
PRODUCT STRUCTURE
PE pipe for underground coal mine is single solid wall, it adopts DHPI’s self-owned patent product CNT modified material. To replace traditional material, the CNT has high electricity conduct features and only use 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 better safety and longer durability.

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Performance Characteristics

Mechanical properties

No.

Item

Index
1

Hydraulic Test

Test 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. 

2

Negative pressure resistance test

Testing negative pressure 0.097 Mpa, keeping 100 hours. Pipe performs no damage or transformation.

3

Flat Peoperty

Pipe inner side being pressed to flat, the entire body no crack or damage. 

4

Falling weight impact test

Test conduct under MT558.2-2005, 9 of 10 pipes no crack or damage.
5

Elongation 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..

Item

Index

1

Surface 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.


2



Alcohol burner burning


The 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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