What kind of anticorrosive pump explosion-proof motor grade are there?

Corrosion protection in the form of motor driven water pump running, according to different requirements, need explosion-proof anticorrosive water pump, so the explosion-proof explosion-proof motor level how to distinguish, what kind of explosion-proof are rated? A level of explosion-proof, explosion-proof motor for according to the following aspects: 1, the classification of dangerous medium: explosive gas, for example, can be divided into type IIA, IIB, IIC three categories, by contrast, type IIA class gas difficult lighting, IIC class gas light, these grades division is mainly in accordance with the test security clearance ( MESG） Or small light current ( MICR） To distinguish. 2, explosive environment: generally fall into three categories: type I - Coal mine methane environment, class II - Explosive gas environment, class III - Explosive dust and fiber environment. 3, explosion-proof technology: currently, China to accept the main electric explosion-proof technology has the following: a. Apply to 0 district has: the Ann model Ex ia, glue sealing type Ex mab. Apply to 1 zone are: apply to 0 the explosion-proof type can be used for 1 area, in addition to the Ann model Ex ib, flameproof Ex d, c. Ex e increased safety type, glue sealing type Ex MB, positive pressure type Ex px and Ex p y, etc. d。 Apply to 2 zone are: apply to the explosion-proof type of 0 and 1 area can be used for 2 area, in addition to the Ann model Ex IC, glue sealing type Ex MC, positive pressure type Ex p z, n Ex nA, nC, nR. 4, explosive medium temperature classes: the same explosive gas, for example, consists of six of the T1 and T6 group. T1 group gas difficult lighting, T6 group gas easy to ignite. T1: gas ignition temperature t & gt; 450 ℃ T2: gas ignition temperature 300 & lt; t ≤ 450 ℃ T3: gas ignition temperature 200 & lt; t ≤ 300 ℃ T4: gas ignition temperature 135 & lt; t ≤ 100 200 ℃ T5: gas ignition temperature & lt; t ≤ 135 ℃ T6: gas ignition temperature 85 & lt; t ≤ 100 ℃, the explosive danger zone division: explosive gas environment is divided into 0, 1 zone and 2 zone, their corresponding relationship is as follows: 0 area: under normal circumstances, the continuous or long-standing sites with explosive air mixture ( More than 1000 h/year) ; 1 area: under normal circumstances, the possible sites with explosive air mixture ( 10 ~ 1000 h /年) ; 2 area: under normal circumstances, explosive gas mixture is not possible ( Or failure cases with explosive gas mixture possible) , or even a place for only short time ( Under 10 h/year) 。 For explosion protection equipment level are defined according to the above five. Second, if a motor design, requirements applicable to class II - IIC for explosive gas environment of explosive gas mixture, the gas temperature classes for T3, and electrical installation and use 1 area. Then through the research, decided to adopt the Ex d flameproof explosion-proof technology, and technology meet the using demand of the IIC class atmosphere. In addition to adapt to gas group T3, the product high surface temperature should not be higher than 200 ℃, verified at 180 ℃, thus lead to another concept, namely, explosion-proof electrical equipment temperature classes, its corresponding to the temperature of the gas group, but different from the temperature of the gas categories: T1: allow high surface temperature t & le; 450 ℃ T2: allows high surface temperature t & le; 300 ℃ T3: allows high surface temperature t & le; 200 ℃ T4: allows high surface temperature t & le; 135 ℃ T5: allows high surface temperature t & le; 100 ℃ T6: allows high surface temperature t & le; 85 ℃ which we identified this motor explosive-proof grade: Ex d IIC T3 Gb, said device can be used in district 1 IIC class T3 group explosive gas environment temperature, equipment for flameproof explosion-proof type d, equipment protection level EPL to Gb. Can also be used according to the environment, for selection of equipment explosive-proof grade. And mark Ⅱ B equipment can be applied to Ⅱ A condition of equipment, Ⅱ C can be applied to the use of A and B Ⅱ Ⅱ conditions.
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