Basic requirements for gas prevention
The mine gas rank is divided according to the relative gas emission of the mine, the absolute gas emission of the mine and the gas emission form:
(1) Low gas mine: The relative gas emission of the mine is less than or equal to 10m3/t and the absolute gas emission of the mine is less than or equal to 40m3/min.
(2) High gas mine: The relative gas emission of the mine is more than 10m3/t or the absolute gas emission of the mine is more than 40m3/min.
(3) Coal (rock) and gas (carbon dioxide) prominent mines.
In low-gas mines, the area with a relative gas emission of more than 10m3/t or with gas emission (mining area or working surface) is a high gas area, which should be managed as a high gas mine.
When the carbon dioxide concentration of gas in the total return airway or one-wing return airway of the mine exceeds 0.75%, the cause must be immediately identified and disposed of.
When the gas concentration in the return airway of the mining area and the return airway of the mining face exceeds 1.0% or the carbon dioxide concentration exceeds 1.5%, the work must be stopped, the personnel should be withdrawn, and measures should be taken for treatment.
When the concentration of carbon dioxide in the airflow of the mining face reaches 1.5%, it is necessary to stop the work, evacuate the personnel, ascertain the cause, and formulate measures for handling.
When mining coal (rock) layers with gas or carbon dioxide, the following measures must be taken:
(1) Drilling holes or drilling holes.
(2) Increase the air volume in the dangerous area.
(3) Introduce the sprayed gas or carbon dioxide directly into the return air passage or the gas drainage line.
Mines with one of the following conditions must establish a permanent gas drainage system on the ground or a temporary gas drainage system in the underground:
(1) The gas emission from a coal mining face is greater than 5m3/min or the gas emission from a tunneling face is greater than 3m3/min. It is unreasonable to solve the gas problem by ventilation.
(2) The absolute gas emission of the mine reaches the following conditions:
1 is greater than or equal to 40m3/min;
2 years production of 1.0Mt ~ 1.5Mt mine, greater than 30m3 / min;
3 years production of 0.6Mt ~ 1.0Mt mine, greater than 25m3 / min;
4 years production of 0.4 Mt ~ 0.6 Mt mine, greater than 20m3 / min;
A mine with a 5-year production of less than or equal to 0.4 Mt is greater than 15 m3/min.
(3) Mining dangerous coal seams with coal and gas outburst.
High-gas mine coal roadway heading face should be installed with isolation (anti-explosion) facilities.
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Products |
Pipe End Cap |
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Size |
1/2"-72" |
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Wall Thickness |
SCH10,SCH20,SCH30,STD,SCH40,SCH60,XS,SCH80,SCH100,SCH120,SCH140, SCH160,XXS |
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Standard |
ASTMA234,ASTM A420,ANSI B16.9/B16.28/B16.25,ASME B16.9, JIS B2311-1997/2312, JIS B2311/B2312, DIN 2605-1/2617/2615, GB 12459-99,EN Standard etc. |
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Material |
CARBON STEEL:A234 WPB WPC,A420 WPL3 WPL6,MSS SP75 SP44,A106,WPHY42 WPHY46 WPHY52 WPHY56 WPHY60 WPHY65 WPHY70,A350,A333,ST37.0,ST35.8, ST37.2,ST35.4/8,ST42,ST45,ST52,ST52.4 ALLOY STEEL:A234 WP5, WP9,WP11,WP12,WP22,WP91,A182 F12,P11,F22,F5,F9,F91 A335 P12,P11,P22,P5,P9,P91 STAINLESS STEEL:A403 WP304,304L,316,316L,321,321L,310,347H,A182 F304,F304L ,F316L,F316,F321,F347H,F310,F44 |
Stainless Steel Caps, Carbon Steel Pipe Caps, Alloy Steel Pipe Caps, Steel Pipe Caps
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