亚洲av精品久久99_成人毛片a级毛片免费观看99_午夜在线观看www免费_一级黄色视频免费观看不卡_在线观看免费国产黄片啊啊啊受不了了_av手机网址_一区二区三区四区久久爱_久久亚洲精华国产精华

Your Position: Home > News > Industry News

Explosion proof level, which level is higher between CT and BT?

2016/12/2??????view:

Ex d  C T5

①②③④ 

①It is the explosion-proof mark of China and the International Electrotechnical Commission.

②D refers to explosion-proof type.

③Simply put, II refers to electrical equipment other than those used in coal mines and underground mines.

     Ⅰ——Coal mine and underground electrical equipment

      Ⅱ——Factory electrical equipment

④和⑤They'are the key point we're going to talk about here today.

Working condition Level Gas Minimum ignition spark energy MESG(mm) MICR
underground coal mine methane 0.280mJ

Factories outside the mine ⅡA propane 0.180mJ MESG≥0.9 MICR>0.8
ⅡB ethylene 0.060mJ 0.9>MESG>0.5 0.8≥MICR≥0.45
ⅡC hydrogen 0.019mJ 0.5≥MESG 0.45>MICR

   In the table above, Group A is the least explosive, Group C is the most explosive, and Group B is in the middle. The vast majority of common gases belong to Group A or Group B, with only a few gases such as hydrogen belonging to Group C. Equipment adapted to Group C gases can be used for explosion prevention in Groups A, B, and C. Equipment adapted to Group B can be used for explosion prevention in Groups A and B, while equipment adapted to Group A gases can only be used for Group A.

So, the explosion-proof rating of BT is lower than that of CT, for example, the explosion-proof rating of BT4 is equal to CT4


Temperature group  T(℃) Common explosive gases Equipment allows surface temperature(℃)
T1 T≥450 46 types of hydrogen, acrylonitrile, etc 450
T2 450>T≥300 47 types of acetylene, ethylene, etc 300
T3 300>T≥200 36 types of gasoline, butenal, etc 200
T4 200>T≥135 Six types including acetaldehyde, tetrafluoroethylene, etc 135
T5 135>T≥100 carbon disulfide
100
T6 100>T≥85 Ethyl nitrate and ethyl nitrite 85
曲阜市| 德阳市| 治县。| 阿鲁科尔沁旗| 项城市| 屯门区| 分宜县| 南部县| 衡山县| 海晏县| 黄山市| 冕宁县| 房山区| 班玛县| 奉化市| 托克托县| 横山县| 手游| 报价| 玛曲县| 顺平县| 巧家县| 雅安市| 涿鹿县| 宜城市| 泽普县| 云阳县| 丰都县| 永寿县| 博客| 图木舒克市| 安顺市| 台东县| 河东区| 达孜县| 绥江县| 江都市| 上饶市| 思茅市| 尉犁县| 沁水县|