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face exceeds 1.0% or the carbon dioxide concentration exceeds 1.5%, the work must be stopped, the personnel should be withdrawn, and measures should be taken for treatment.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.

Flange-Mounted Pressure Filter

SDDF QE series pressure filters are designed in accordance with international regulation, which consist of a filter housing with a screw on cover plate.

Standard equipment

-mounting holes in the filter head

-two-piece bowl for size 660 and above

-compatibility with fire-resistant fluids HFA/HFC

-drain plug with pressure relief(size 330 and above)

Connection Diagram

Filter Element

Shengda is sure that our filters are of reliable performance so that they can protect hydraulic parts from polluting and machines from abrasion.

Filter elements are available with the following pressure stability values

BN/HC:25bar

BH/HC:210bar

W/HC:30bar

V:210bar

Seals

-NBR(=NBR)

Special models and accessories

-with bypass valve

-drain plug with pressure relief

-seals in FPM, EPDM

Grader Filter,High Pressure Filter,Flange-Mounted High Pressure Filter,Flange-Mounted Pressure Filter

Xinxiang Shengda Filtration Technique Co., Ltd. , https://www.shengdafiltration.com