- Brand: LseLe
- Model: DN15X700
- Material: PVC
- Suitable for: heavy
- Diameter: 16mm
- Pricing unit: root
Explosion-proof flexible connecting pipe is composed of union joint and connecting pipe; connecting pipe is composed of inner tube and sheath;
Live joints made of stainless steel, or high-quality carbon steel electroplating treatment;
The inner tube is made of bellows or metal hose, with good corrosion resistance;
With flame retardant, corrosion resistance, water resistance, aging resistance, good flexibility, solid structure, reliable and so on;
Thread size specifications can be customized according to user requirements, such as NPT Thread, inch and metric threads;
Explosion-proof flexible connecting pipe length, the conventional supplier 500 mm , 700 mm , 1000mm To choose from, can also be customized according to user needs other lengths;
Examples of ordering
The thread size can be selected according to the size of the piping and the connection thread of the appliance, instrument, and equipment. The non-standard parts such as: DN20 (G3 / 4 inch) metal pipe M20 * 1.5 / 1 / 2NPT Connection method! ...................
First, the classification of explosive substances
According to the use of the environment can be divided into three categories:
Ⅰ: underground mine;
Class II: Explosive gas mixtures (including steam, mist);
Class III: Explosive dust (including fiber or flying objects).
North American countries, also divided into three categories:
Class I: Explosive gases;
Class Ⅱ: Explosive dust;
Class III: Explosive fibers.
Second, the explosion-proof classification of the classification of groups of the largest test gas safety gap minimum ignition current
Ⅰ methane - in the mine
IIA ethane, propane, carbon monoxide, methanol, gasoline propane> 0.9m m> 0.8
Ⅱ B gas, ethylene ethylene 0.5 ~ 0.9 m m 0.45 ~ 0.8
Ⅱ C hydrogen, acetylene hydrogen acetylene< 0.5m m < 0.45
Equipment marked Ⅱ B can be used for Ⅱ A conditions, the equipment can be used to mark Ⅱ A, Ⅱ B equipment conditions of use.
3. Temperature groups of gases or vapor explosive gas mixtures
Divided into six groups, the maximum surface temperature of the device is not allowed to exceed this value minus the temperature of 5 ℃.
T1 - 450C, T2 - 300C, T3 - 200C
T4-135C, T5-100C, T6-85C
Fourth, according to the form of explosion-proof classification
1. Explosion-proof equipment 'd', initially established by the German explosion-proof form of the world's most mainstream form of application explosion.
2. Increased safety explosion-proof equipment 'e', the use of high cost, a small amount of use
3. Intrinsically safe explosion-proof equipment 'i', the use of high cost, a small amount of use
4. Positive pressure explosion-proof equipment 'p', the use of high cost, rarely used
5. Encapsulated explosion-proof equipment 'm', maintenance of inconvenience, a small amount of use
6. Airtight explosion-proof equipment 'h', maintenance of inconvenience, a small amount of use
7. No spark-type explosion-proof equipment 'n', manufacturing costs are high, rarely used
8. Oil-filled explosion-proof equipment 'o', rarely used
9. Sand-filled explosion-proof equipment 'q', rarely used
Fifth, the definition of dangerous places
Hazardous areas are classified into explosive gas atmospheres and flammable dust environments, depending on the state of matter present in the site.
According to the length of time, the dangerous places in two different physical states are divided into three zones, namely, 0, 1 and 2 for the explosive gas environment; for the environment of combustible dust, 20, 21 and 22 zones.
(1) explosive gas environment GB 3836.14-2000 standard provides:
Area 0: explosive gas environment for a long time or continuous presence of the place.
Zone 1: Areas where explosive atmospheres may occur during normal operation.
Zone 2: In normal operation, no explosive gas environment, if there are occasional and only a short time there is a place.
'Normal operation' means normal driving, running, stopping, loading and unloading of flammable substances, opening and closing of airtight container covers, safety valves, discharge valves, and all plant equipment operating within their design parameters.
(2) flammable dust environment GB 12476.1-2000 standard provides:
Zone 20: Flammable dusts are present or frequent during normal operation in quantities sufficient to form a mixture of flammable dust and air and / or where they may form uncontrollable and extremely thick dust layers.
Zone 21: During normal operation, there may be sites where the amount of dust is sufficient to form a mixture of flammable dust and air but not in Zone 20. This area includes areas immediately adjacent to the point where the dust is filled or discharged, dust and Combustible dust and air mixtures that may produce flammable concentrations in normal operating conditions.
Zone 22: Areas where flammable dust clouds may occasionally occur and are present only occasionally, or where flammable dusts may occasionally accumulate or may present dust layers and produce flammable dust air mixtures under abnormal conditions. If flammable dust accumulation can not be excluded Or dust layer, it should be divided into 21 areas. .............