Technical measures for the elimination of gas in the shutdown area
2. When discharging gas, the principle of low-concentration emission should be adhered to, and the gas concentration after mixing the discharged airflow with the full-wind pressure can not exceed 1.5% by controlling the air volume. 3. Discharge gas, the route through which the return air flows must cut off the power supply, evacuate the personnel, set the fence or alert, and stop the operation. The power supply can be restored when the gas concentration in the roadway airflow does not exceed 1.0% and the carbon dioxide concentration does not exceed 1.5%. 4. When the concentration of gas in the closed roadway does not exceed 3%, the person in charge of the level shall be responsible for the discharge. When more than 3%, the person in charge of the level shall submit written measures, approved by the person in charge of the mine, and discharged by the mine leader. The mine rescue team assisted in the discharge. 5. The work of discharging gas should be carried out from the outside to the inside. It is strictly forbidden to discharge gas at the same time in two gas-limited locations in one production system. 6. After the local ventilator is turned on, the two staff members who wear the self-rescuer walk in tandem, gradually withdraw the enclosed area, and gradually add the air duct from the outside to the inside. 7. In gas emission, when the gas concentration is below 1.0%, it can enter the shutdown area.
Elbow Type: 45/90/180Elbow;Return Elbow
Standard: ASME/ANSI B16.9 ANSI/ASME B16.11 ANSI/ASME B16.28
BSEN10253-2 BS EN10253-4 DIN2605 -1 DIN2602-2 GOST 17375-01 GOST 30753-01 ,MSS-SP-75
Size:1/2''~48''(Seamless); 16''~80''(Welded)
Wall thickness: Sch5~Sch160\XXS
Manufacturing process: Hot expending ,pressed , etc.
Material:
Carbon steel:
FSGP PG370W PT370
HIGH YIELD STEEL FOR PIPELINE AND OFFSHORE FITTINGS
Stainless steel:
304/SUS304/UNS S30400/1.4301
304L/UNS S30403/1.4306;
304H/UNS S30409/1.4948;
309S/UNS S30908/1.4833
309H/UNS S30909;
310S/UNS S31008/1.4845;
310H/UNS S31009;
316/UNS S31600/1.4401;
316Ti/UNS S31635/1.4571;
316H/UNS S31609/1.4436;
316L/UNS S31603/1.4404;
316LN/UNS S31653;
317/UNS S31700;
317L/UNS S31703/1.4438;
321/UNS S32100/1.4541;
321H/UNS S32109;
347/UNS S34700/1.4550;
347H/UNS S34709/1.4912;
348/UNS S34800;
Alloy steel:
ASTM A234 WP5/WP9/WP11/WP12/WP22/WP91;
ASTM A860 WPHY42/WPHY52/WPHY60/WPHY65;
ASTM A420 WPL3/WPL6/WPL9;
Duplex steel
ASTM A182 F51/S31803/1.4462;
ASTM A182 F53/S2507/S32750/1.4401;
ASTM A182 F55/S32760/1.4501/Zeron 100;
2205/F60/S32205;
ASTM A182 F44/S31254/254SMO/1.4547;
17-4PH/S17400/1.4542/SUS630/AISI630;
F904L/NO8904/1.4539;
725LN/310MoLN/S31050/1.4466
253MA/S30815/1.4835;
Nickel alloy steel:
Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;
Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;
Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;
Alloy K-500/Monel K-500/NO5500/2.475;
Alloy 600/Inconel 600/NO6600/NS333/2.4816;
Alloy 601/Inconel 601/NO6001/2.4851;
Alloy 625/Inconel 625/NO6625/NS336/2.4856;
Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;
Alloy 800/Incoloy 800/NO8800/1.4876;
Alloy 800H/Incoloy 800H/NO8810/1.4958;
Alloy 800HT/Incoloy 800HT/NO8811/1.4959;
Alloy 825/Incoloy 825/NO8825/2.4858/NS142;
Alloy 925/Incoloy 925/NO9925;
Hastelloy C/Alloy C/NO6003/2.4869/NS333;
Alloy C-276/Hastelloy C-276/N10276/2.4819;
Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;
Alloy C-22/Hastelloy C-22/NO6022/2.4602;
Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;
Alloy B/Hastelloy B/NS321/N10001;
Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;
Alloy B-3/Hastelloy B-3/N10675/2.4600;
Alloy X/Hastelloy X/NO6002/2.4665;
Alloy G-30/Hastelloy G-30/NO6030/2.4603;
Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;
Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;
Alloy 31/NO8031/1.4562;
Alloy 901/NO9901/1.4898;
Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;
Inconel 783/UNS R30783;
NAS 254NM/NO8367;
Monel 30C
Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952
Nimonic 263/NO7263
Nimonic 90/UNS NO7090;
Incoloy 907/GH907;
Nitronic 60/Alloy 218/UNS S21800
Seamless Elbow,Pipe Elbow,Carbon Steel Elbow,Steel Pipe Elbow HeBei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com
.ASTM / ASME A234: WPB - WPC - WP1WP11 - WP12 - WP5 - WP22 - - WP91 CT20 09R2C
ASTM / ASME A/SA 420: WPL6 - WPL3EN 10216-2: P195GH - P235GH - P265GH-P355Nh
20MnNb6 - 16Mo3 - 8MoB5-4 - 14MoV6310CrMo5-5 - 13CrMo4-5 - 10CrMo9-10-15NiCuMoNb5-6-4 - X11CrMo5X11CrMo9-1 - X10CrMoVNb9-1X10CrWMoVNb9-2 - X20CrMoV11-1former BS-DIN-AFNOR equivalent grades)
ASTM A860 / MSS-SP75: WPHY 42WPHY 46 - WPHY 52 - WPHY 60-WPHY 65 - WPHY 70 grades
WPHY 80 only as per MSS-SP75 EN 10208-2: L245NB - L290NBL360NB - L415NB - L360QBL415QB - L450QB - L485QB - L555Q