Shenhai Pagsabog-Patunay
Let’s start by explaining the various explosion-proof ratings, ano ang ipinahihiwatig ng mga ito, at kung paano piliin ang mga ito sa pagsasanay, Paggamit ng mga kahon ng pamamahagi na patunay ng pagsabog bilang isang halimbawa.
| Gas group / temperatura grupo | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|
| IIA | Pormaldehayd, toluene, metil ester, acetylene, propane, acetone, acrylic acid, Benzene, styrene, carbon monoxide, ethyl asetato, acetic acid, chlorobenzene, methyl asetato, kloro | Methanol, ethanol, ethylbenzene, propanol, propylene, butanol, butyl asetato, amyl asetato, cyclopentane | Pentane, pentanol, hexane, ethanol, Heptane, octane, cyclohexanol, turpentine, naphtha, petrolyo (pati na ang gasolina), gasolina ng langis, pentanol tetrachloride | Acetaldehyde, trimethylamine | Ethyl nitrite | |
| IIB | Propylene ester, dimethyl ether | Butadiene, epoxy propane, ethylene | Dimethyl ether, acrolein, hydrogen karbid | |||
| IIC | Hydrogen, gas sa tubig | Acetylene | Carbon disulfide | Ethyl nitrate |
Pagmamarka ng sertipikasyon:
Ex d IIB T4 Gb/Ex tD A21 IP65 T130 o C ay isang unibersal na sertipiko para sa proteksyon ng gas at pagsabog ng alikabok, where the part before the slash (/) indicates the gas explosion-proof level, and the part after the slash indicates dust explosion-proof.
Ex: Explosion-proof marking, the standard format of IEC (International Electrotechnical Commission) mga rating na hindi nasasagot ng pasabog.
d: Flameproof uri ng, indicating the primary form of explosion protection is flameproof.
IIB: Represents Class B gas explosion protection.
T4: Indicates the temperatura class.
Gb: Indicates this product is suitable for Zone 1 proteksyon sa pagsabog.
For the pagsabog ng alikabok part in the latter half, it’s sufficient to achieve the highest dust protection grade 6 based on the gas explosion-proof standards.
tD: Represents the type of enclosure protection (preventing dust ignition with enclosure).
A21: Indicates the applicable area, suitable for Zone 21, Sona 22.
IP65: Represents the protection grade.
It’s crucial to choose the correct explosion-proof rating in actual environments.
Una, it’s important to understand two main categories, as described below:
Explosion-proof types:
Klase I: Electrical equipment for underground coal mines;
Klase II: Electrical equipment for all other pasabog na gas environments except coal mines and underground.
Class II can be divided into IIA, IIB, at IIC, where equipment marked IIB can be used under conditions suitable for IIA devices; IIC can be used under conditions suitable for both IIA and IIB.
Klase III: Electrical equipment for explosive dust environments other than coal mines.
IIIA: Combustible flyings; IIIB: Hindi konduktibong alikabok; IIIC: Kondaktibong alikabok.
Explosion-proof areas:
Sona 0: Where explosive gases are always or frequently present; continuously hazardous for more than 1000 hours/year;
Sona 1: Where madaling mag-init gases might occur during normal operation; intermittently hazardous for 10 sa 1000 hours/year;
Sona 2: Where flammable gases are not normally present and, if they occur, are likely to be infrequent and short-lived; hazardously present for 0.1 sa 10 hours/year.
It is important to note that we deal with Class II and III, Sona 1, Sona 2; Sona 21, Sona 22.
Karaniwan, reaching IIB is sufficient for gases, but for hydrogen, acetylene, at carbon disulfide, a higher level of IIC is required. For dust explosion protection, just achieve the corresponding gas Antas na patunay ng pagsabog and the highest dust grade.
There’s also a combined type of Kahon ng pamamahagi na patunay ng pagsabog rating: ExdeIIBT4Gb.