Shenhai Explosion-Proof
Cov khoom tiv thaiv kev tiv thaiv (EPL) Ntsuam xyuas cov tawg-pov thawj reliability ntawm ib hom ntaus ntawv raws li tej faults thiab tiv thaiv kev ntsuas, Muab rau neeg noj raws li ib tug tseem ceeb kev ruaj ntseg indicator rau tawg-prof hluav taws xob khoom.
| Qeb | Roj Classification | Cov neeg sawv cev gases | Yam tsawg kawg yog Ignition spark zog |
|---|---|---|---|
| Nyob rau hauv lub mine | Kuv | methane | 0.280mJ |
| Factories sab nraum lub Mine | IIA | Propane | 0.180mJ |
| IIB | Ethylene | 0.060mJ | |
| IIC | hydrogen | 0.019mJ |
Cov theem yog categorized ua ib, b, thiab c:
1. Level a ensures consistent explosion-proof safety performance under normal operations and during both anticipated and rare faults.
2. Level b guarantees the retention of explosion-proof safety performance during normal operations and foreseeable faults.
3. Level c assures the maintenance of explosion-proof safety performance in both normal operations and specific abnormal situations.
feem ntau, an explosion-proof device is expected to meet Level 3 kev tiv thaiv. In certain cases, txawm li ntawd los, Levels 2 Lossis 1 may be permissible for specific explosion-proof types.
Marking methods include:
1. Based on the explosion-proof type symbol:
The combination of the tawg-profo and equipment protection level symbols denotes the protection level. piv txwv li, basic safety devices are marked as ia, ib qho, los sis ic.
2. Based on the equipment type symbol:
Merging the equipment type and protection level symbols indicates the protection level. Piv txwv, Hoob Kawm Kuv (tsuas) equipment is marked as Ma or Mb (M representing mine); Hoob Kawm III (Hoobkas, pa roj) equipment is marked as Ga, gb, or Ge (G for gas).
It’s crucial to understand that equipment protection levels and explosion-proof levels are distinct concepts often confused in application. The protection level indicates “kev ua siab,” while the explosion-proof level reflects “combustible roj properties and equipment structural features.” piv txwv li, in an industrial setting with a constant hydrogen explosion risk (tsam 0), required intrinsic safety equipment would be Level ia, Explosion-Proof Level IIC. In a less frequent hydrogen risk setting (tsam 1), Level ib, IIC intrinsic safety equipment would meet the needs, though Level ia, IIC equipment could also be suitable.