1, top type
Seam coal layer 3 and 4 may be partially recoverable I miners mining, generally no false roof seam 5, which mostly directly shale roof (carbonaceous shale), siltstone or fine sand, a more complete hard; generally in the roof , coarse sandstone, complete and hard. The roof of my mine is easy to fall off ~ medium falling roof.
2, support method
I ore mining, tunnel digging support ways: Coal Lane, semi-coal Lane is generally used to set up U-shaped steel arch support and other metal bracket supporting the anchor net (rope); rock roadway generally use the anchor net Shotcreting or Anchor spray support. The coal mining face must be timely supported in accordance with the provisions of the operating procedures, and empty top operations are strictly prohibited. The mining face of our mine generally adopts a single hydraulic prop with a hinged top beam to manage the roof.
Flange Rating also named flange pressure or flange class, flange rating class or pressure are for flanges application, low pressure medium pressure and high pressure will have different flanges class using. EU flanges pressure for PN6 PN10 PN16 PN25 PN40, Japanese and Korean flanges pressure for 5K 10K 16K 20K 30K and US flanges rating class for 150 300 600 900 1500 2500.
Flange Rating
Flange Rating, flange class pressure, flange pn, flange lbs, flange table, flanges manufacturer
Jinan Hyupshin Flanges Co., Ltd , https://www.iflange.com