Classifying apparatus explosive gas ignition device and explosive gas temperature allows the maximum surface temperature packet classification apparatus <br> <br> explosive gas
IPâ–¡â–¡Protection level, IP is the international protection class symbol (INTERNATIONAL PROTECTIONRATINGS) followed by two digits. The first digit indicates the dustproof capability of the device, which is called the first characteristic digit, and the second digit indicates the waterproof of the device. Ability, called the second characteristic number.
Corrosion Protection Electrical Product Signs Explosion Hazard Environment Area Division
In order to correctly select electrical equipment and set up distribution lines in an explosion hazardous environment, electrical equipment and lines with different degrees of protection are selected in accordance with different hazardous areas, and the “Power Design Code for Explosive and Fire Hazardous Environments†(GB50058-92) is divided. The hazardous area zoning in an explosive environment is consistent with the IEC's classification of explosion hazardous areas.
1. Classification of Explosive Hazardous Environments: Explosive hazardous environments are divided into two categories according to the form of explosive substances: gas explosion hazardous environment and dust explosion hazardous environment.
2. Division of explosive gas environment:
Explosive gas atmospheres are zoned according to the frequency, duration, and risk of explosive gas mixtures. That is, zoning is based on different conditions in which explosive gas mixtures occur continuously or in a long-term or short-term.
The explosive gas environment is divided into three hazardous areas:
(1) Zone 0: An environment in which explosive gas mixtures occur continuously or over a long period of time;
(2) Zone 1: The environment in which explosive gas mixtures may occur during normal operation;
(3) Zone 2: The environment in which explosive gas mixtures cannot occur during normal operation, or even the presence of explosive gas mixtures that are present only for a short period of time.
Generally, in the flammable gas environment, explosion-proof products must be used when using electrical products. Explosion-proof products generally have the following marks on the shell, the specific meanings are as follows:
ExdIIBT4
12345
1. China and International Electrotechnical Commission explosion-proof signs 2. Flameproof type 3. Electrical equipment other than coal mines and underground use 4. According to the maximum experimental safety clearance or minimum ignition current of explosive gas atmosphere, it is divided into ABC level 3, according to equipment The maximum surface temperature is divided into six groups from T1 to T6. The first bit code:
Ex - Explosion Proof Mark of China and International Electrotechnical Commission; EEx - EC; AD - Italy; MS, AE - France; FLP - UK; UL, FM - USA; E - Germany \ IEC
Code No. 2 Explosion protection type National standard Explosion-proof measures Area d Flameproof type GB3836.2 Isolation Existential ignition source Zone1, Zone2
e Increase safety type GB3836.3 try to prevent the ignition source Zone1, Zone2
IA Intrinsically Safe GB3836.4 Limits the energy of the ignition source Zone0-2
Ib intrinsically safe GB3836.4 limited ignition source energy Zone1, Zone2
p Positive pressure type GB3836.5 Hazardous material is separated from the ignition source Zone1, Zone2
o Oil-filled GB3836.6 hazardous material is separated from the ignition source Zone1, Zone2
q Grit-filled GB3836.7 Hazardous material is separated from the ignition source Zone1, Zone2
n No spark type GB3836.8 to try to prevent the ignition source Zone2
m Encapsulated Type GB3836.9 seeks to prevent the ignition source Zone1, Zone2
h Airtight type GB3836.10 tries to prevent the ignition source Zone1, Zone2
s Special DIP dust explosion-proof type is used in explosive dust environment. It is not required to add EX or EEX marks in front of it. Hazardous locations Risk classification:
Explosive material area definition Chinese standard North American standard
Gas (CLASSI) Under normal conditions, a continuous or long-lasting place of explosive gas mixture Zone0 (zone 0) Div. 1
Under normal circumstances explosive gas mixtures are likely to be present in area 1 Zones Under normal circumstances explosive gas mixtures are not possible, only under unusual circumstances, Occasionally or short-term sites 2 Zone Div. 2
Dust or fiber (CLASS II/III) Under normal conditions, explosive dust or mixture of combustible fiber and air may be continuous, frequently occur for a short time or exist for a long time. Zone 10 Div.1
Under normal conditions, explosive dust or mixture of combustible fibers and air cannot appear, only in unusual circumstances, Occasionally or short-term place 11 District Div.2
No. 3 Code I—Coal Mine, Downhole Electrical Equipment II—Factory Electrical Equipment No.4 Code II Class II Explosive Gas Environment Classification Condition Class Level Representative Gas Minimum Explosion Spark Energy Maximum Experimental Safety Gap MESG(mm) Minimum ignition current ratio MICR
Mine I Methane 0.280mJ
Outside the mine plant IIA propane 0.180mJMESG ≥ 0.9MICR> 0.8
IIB Ethylene 0.060mJ0.9>MESG>0.50.8≥MICR≥0.45
IIC hydrogen 0.019mJ0.5≥MESG0.45>MICR
Bit 5 Code II Type II Explosive Gas Environment Electrical Equipment Temperature Group Temperature Group Natural Temperature T (°C) Common Explosive Gas Equipment Permissible Surface Temperature (°C)
T1T ≥ 450 hydrogen, acrylonitrile and other 46 species of 450
T2450>T≥300 Acetylene, Ethylene and other 47 kinds 300
T3300>T≥200 gasoline, crotonaldehyde and other 36 kinds 200
T4200>T≥135 acetaldehyde, tetrafluoroethylene, 6 kinds of 135
T5135>T≥100 Carbon disulfide 100
T6100>T≥85 ethyl nitrate and ethyl nitrite 85
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Small density, good wear resistance, self - lubricity, impact resistance, corrosion resistance and so on.
Advantages:
1. Average molecular weight about 5,000,000 to 9,000,000;
2.The best abrasive assistance of all plastics , which 4 times higher than that of nylon 66 or teflon and 6 times higher than that of carbon steel;
3.Extremely high impact stength ,which is twice as high as PC ,5 times as high as ABS,it also retaines high toughness at liquid nitrogen temperature (-196'C);
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6.High chemical stability ,capable of resisting various types of corrosion and organic media within certain temperature and concentration range;
7.Strong adhensive resistance which is only second to Teflon;
8.UHMW-PE Plastic is safe , healthful and non-toxic and be can used in contact with food and drugs ;
9.Low density than any other thermoplastic ;
10.Excellent electrical insulation and static resistance ,good resistance to high energy radiation;
11.Moderate mechanical strength,stiffness and creep-resistant property'
12.Outstanding machining property ,very low water absorption .
Deficiencies:
Compared with other engineering plastics, UHMW-PE Plastic is resistant to heat resistance, stiffness and hardness, but can be improved by means of "filling" and "crosslinking".
From the point ofheat resistance, the melting point of UHMW-PE Plastic is approximately the same (136 ℃) and ordinary polyethylene, but because of its big molecular weight, melt viscosity high, so the processing difficulty is big.
Applications:
Papermaking industry : suction box boards ,scrapper,molding plate ,beating ,gear .
Mining industry : charging barrel ,abrasive and adhensive -resistant back lining for warehouses.
Chemical industry : acid pump ,fliter plate , worm gear ,bearing .
Food industry :packing machinery parts ,bottle guide ,screw .wear plate ,slide away ,stud weld ,roller and other transmission parts.
Tenxile industry : buffer board
Food processing industry : chopping block ,refrigerating plant
Wharf:anti-collision board
Specification: the thickness of UHMW-PE Plastic sheet material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width can exceed 1200mm, and the length is not limited.
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 600mm* 1200mm, and the commonly used specification of 10-180mm is 1200*3080mm. UHMW-PE Plastic can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited.
Color: Black and white, can also be made another color, and the color order is 500KG.
Modified varieties: UHMW-PE Plastic can be added to the Glass Fiber, copper powder, and molybdenum disulfide enhancement plate according to customer's requirements.
Add antistatic agent to the permanent plate, the volume resistance value of 10 to the 6 to 9 power.
Add flame retardant to the flame retardant board from UL 94v-0 to HB combustion grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.
Product certification: most environmental certification reports and safety reports forraw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
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