- Brand: LseLe
- Model: DN15X700
- Material: PVC
- Suitable for: Heavy
- Diameter: 16mm
- Denominated: root
Proof flexible connecting pipe from the union and the connecting pipe; connecting pipe from the inner tube and the sheath composition;
Union made of stainless steel or high-quality carbon steel plating;
The inner tube is made of corrugated metal hose or pipe with good corrosion resistance;
A flame retardant, corrosion resistance, water resistance, aging resistance, flexible and firm structure, reliable work;
Thread sizes can be processed according to specific user requirements, such as NPT Thread, inch and metric thread and so on;
Proof flexible connecting pipe length, there are regular supplier 500mm , 700mm , 1000mm To choose from, other lengths can also be customized according to user needs;
Connecting thread Description: Thread Size Optional Select the correct based on the user pipe connecting thread size and electrical, instrumentation, equipment; non-standard items, such as:! DN20 (G3 / 4 inch) metal pipe with M20 * 1.5 / 1 / 2NPT etc. connection! ...................
First, the classification of explosive substances
By use of the environment can be divided into three categories:
Ⅰ categories: underground mine;
Ⅱ categories: explosive gas mixtures (including vapors, mists);
Ⅲ categories: explosive dust (or catkins fibrous material).
North American countries, can be divided into three categories:
Ⅰ categories: explosive gas;
Ⅱ categories: explosive dust;
Ⅲ categories: explosive fibers.
Second, the explosion proof classification group representative gas maximum experimental safe gap Minimum ignition current
Ⅰ methane - mine
ⅡA ethane, propane, carbon monoxide, methanol, gasoline, propane> 0.9m m> 0.8
ⅡB gas, ethylene vinyl 0. 5 ~ 0. 9 m m 0.45 ~ 0.8
ⅡC hydrogen, acetylene hydrogen acetylene< 0.5m m < 0.45
The device can be used to label ⅡB ⅡA conditions of use, the device can be used to mark ⅡC conditions ⅡA, ⅡB equipment.
Third, the gas or vapor explosive gas mixture temperature groups
Divided into six groups, maximum surface temperature of the equipment must not exceed this value minus 5 ℃ temperature.
T1--450 ℃, T2--300 ℃, T3--200 ℃
T4--135 ℃, T5--100 ℃, T6--85 ℃
Fourth, according to the classification proof in the form
1. Explosion-proof device 'd', proof in the form originally established by Germany is currently the most mainstream form of explosion-proof applications worldwide.
2. Increased Safety device 'e', the use of high cost, the use of a small amount
3. Intrinsically Safe equipment 'i', the use of high cost, the use of a small amount
4. The pressure explosion-proof equipment 'p', the use of high cost, rarely used
5. Encapsulation explosion-proof equipment 'm', inconvenient maintenance, use a small amount
6. The gas-tight explosion-proof equipment 'h', inconvenient maintenance, use a small amount
7. No spark-proof equipment 'n', high manufacturing costs, rarely used
8. The oil-filled explosion-proof equipment 'o', rarely use
9. filling sand-proof equipment 'q', rarely use
Fifth, the definition of hazardous locations
Different states of matter by the presence of substances in the workplace, will be divided into dangerous places for explosive gas atmospheres and combustible dust.
Press the presence of hazardous substances in the workplace length of time, the danger of state under two different places is divided into three zones, namely: an explosive atmosphere, is 0, Zone 1 and Zone 2; combustible dust environment, 20, zone 21 and zone 22.
(1) explosive gas atmospheres GB 3836.14-2000 standard provides:
Zone 0: an explosive gas atmosphere continuously or for long periods of place.
Zone 1: In normal operation, place an explosive gas atmosphere may occur.
Zone 2: In normal operation, an explosive gas atmosphere impossible, if there is occasional and only for a short time existing sites.
'Normal operation' means normal driving, loading and unloading operation, parking, flammable material goods, airtight container lid opening and closing state safety valve, drain valve and all plant equipment are operating within its design parameters.
(2) combustible dust GB 12476.1-2000 standard provides:
Zone 20: continuous combustible dust occur during normal operation or frequently in an amount sufficient to form combustible dust and air mixtures and / or internal spaces and containers may not be formed to control and very thick layers of dust.
District 21: During normal operation, the dust may occur in quantities sufficient to form a flammable dust and air mixture is not classified as Zone 20 places in the region include, filled with dust or discharge point directly adjacent to the place, and dusts occur. place under normal operating conditions may generate ignitable concentrations of flammable dust and air mixture.
Zone 22: Under abnormal conditions, combustible dust cloud and the occasional presence of only a short time, or flammable dust accumulation or there may be occasional dust layer and generating spaces combustible dust air mixtures can not be guaranteed if excluded combustible dust accumulation. or dust layer should be divided into 21 zones. .............