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Classification standards for explosion-proof levels

This site2017-04-07 14:21:49

Three conditions must be met for an explosion:
1) Explosive substances: substances that can react with oxygen (air), including gases, liquids and solids. (Gas: hydrogen, acetylene, methane, etc .; liquid: alcohol, gasoline; solid: dust, fiber dust, etc.) 2) oxygen: air. 3) Ignition source: including open flame, electrical spark, mechanical spark, static spark, high temperature, chemical reaction, light energy, etc.

Why Explosion-proof

Explosive substances: Some flammable substances are produced in many production sites. Explosive substances are present in about two-thirds of the coal mines; in the chemical industry, explosive substances are found in more than 80% of the production plant area. Oxygen: Oxygen is everywhere in the air. Ignition source: A large number of electrical instruments are used in the production process. Various frictional sparks, mechanical wear sparks, static sparks, high temperatures, etc. are unavoidable, especially when the instrument and electrical failure.
Objectively, many industrial sites meet explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosive limit range, an explosion will occur if there is an explosion source. Therefore, it is necessary to adopt explosion protection.

The principle of instrument explosion protection

Hazardous division of dangerous places:

Explosive substance

Area definition

in    country  

Mark    quasi-

north    nice

Mark    quasi-

Gas (CLASS Ⅰ)

Places where explosive gas mixtures are continuously or prolonged under normal circumstances

Zone 0

Div.1

Places where explosive gas mixtures can occur under normal circumstances

zone 1

Under normal circumstances, explosive gas mixtures are unlikely to occur, but only in unusual situations, occasional or short-term locations

Zone 2

Div. 2

Dust or fiber (CLASS Ⅱ / Ⅲ)

Under normal circumstances, places where explosive dust or combustible fiber and air may be continuous, frequently appear for a short time or exist for a long time

District 10

Div.1

Under normal circumstances, explosive dust or a mixture of flammable fibers and air cannot appear, only under abnormal conditions, occasionally or for a short time

District 11

Div. 2

Applicability of explosion-proof methods to hazardous locations:

Serial number

Explosion-proof type

Code

National standard

Explosion protection measures

Application area

1

Flameproof

d

GB3836.2

Isolate existing ignition sources

Zone1, Zone2

2

Increased safety

e

GB3836.3

Try to prevent ignition sources

Zone1, Zone2

3

Intrinsic safety

ia

GB3836.4

Limit the energy of the ignition source

Zone0-2

Intrinsic safety

ib

GB3836.4

Limit the energy of the ignition source

Zone1, Zone2

4

Positive pressure type

p

GB3836.5

Separation of hazardous materials from ignition sources

Zone1, Zone2

5

Oil-filled

o

GB3836.6

Separation of hazardous materials from ignition sources

Zone1, Zone2

6

Sand-filled

q

GB3836.7

Separation of hazardous materials from ignition sources

Zone1, Zone2

7

Non-sparking

n

GB3836.8

Try to prevent ignition sources

Zone2

8

Encapsulated

m

GB3836.9

Try to prevent ignition sources

Zone1, Zone2

9

Airtight

h

GB3836.10

Try to prevent ignition sources

Zone1, Zone2

Applicability of explosion protection to hazardous locations:
Classification of explosive dangerous gases
According to the minimum spark energy that can be detonated, explosive gas is classified into four dangerous levels in China, Europe and most countries and regions in the world, as shown in the following table:

Operating category

Gas classification

Representative gas

Minimum detonation spark energy

Under the mine

I

Methane

0.280mJ

Factory outside the mine

ⅡA

Propane

0.180mJ

ⅡB

Ethylene

0.060mJ

ⅡC

hydrogen

0.019mJ

The United States and Canada first divided explosive objects dispersed in the air into three CLASS (category): CLASS Ⅰ gas and vapor; CLASS Ⅱ dust; CLASS Ⅲ fiber. Then the gas and dust were divided into Group:

group name

Representative gas or dust

A

Acetylene

B

hydrogen

C

Ethylene

D

Propane

E

Metal dust

F

Coal dust

G

Grain dust

Division of gas temperature groups:

Temperature group

Safe object surface temperature

Common explosive gases

T1

≤ 450 ℃

46 kinds of hydrogen, acrylonitrile, etc.

T2

≤ 300 ℃

47 types including acetylene and ethylene

T3

≤ 200 ℃

36 types including gasoline and butenal

T4

≤ 135 ℃

6 types including acetaldehyde and tetrafluoroethylene

T5

≤ 100 ℃

Carbon disulfide

T6

≤ 85 ℃

Ethyl nitrate and ethyl nitrite

Ex(ia)ⅡC T6 的含义: The meaning of the instrument's explosion-proof mark Ex (ia) IIC T6:

Logo content

symbol

meaning

Explosion protection statement

Ex

Meet certain explosion-proof standards, such as China's national standards

Explosion-proof mode

ia

Adopts ia class intrinsically safe explosion-proof method, can be installed in zone 0

Gas category

ⅡC

Permitted to involve IIC explosive gas

Temperature group

T6

Meter surface temperature does not exceed 85 ℃

Meaning of Ex (ia) ⅡC

Logo content

symbol

meaning

Explosion protection statement

Ex

Compliant with European explosion-proof standards

Explosion-proof mode

ia

Adopts ia class intrinsically safe explosion-proof method, can be installed in zone 0

Gas category

ⅡC

Permitted to involve IIC explosive gas

: Note: There is no temperature group item in this mark, indicating that the instrument is not in direct contact with explosive gas.

Explosion-proof term:

Related explosion-proof terms and standards
Safety barrier safety parameter definition:

安全栅最高允许电压: Um · Maximum allowable voltage of safety barrier: Um

Guarantee the intrinsic safety performance of the intrinsically safe side of the safety barrier and allow the highest voltage that the non-intrinsically safe side can input

安全栅最高开路电压: Uoc · Highest open circuit voltage of safety barrier: Uoc

Maximum voltage when the intrinsically safe terminal is open in the maximum allowable voltage range

安全栅最大短路电流: Isc · Maximum short-circuit current of safety barrier: Isc

Maximum current when the intrinsically safe terminal is shorted within the maximum allowable voltage range

安全栅允许分布电容: Ca · Safety barrier allows distributed capacitance: Ca

Maximum allowable external capacitor for intrinsically safe end under guaranteed intrinsic safety performance

安全栅允许分布电感: La Safety barrier allows distributed inductance: La

The maximum allowable external inductance of the intrinsically safe terminal under the condition of ensuring intrinsically safe performance

Explosion mark format description:

Scientifically classify the explosive hazardous media in factories or mining areas according to their ignition energy, minimum ignition temperature, and the time period of the presence of explosive hazardous gases on site to determine the explosion-proof signs and explosion-proof forms of the on-site explosion-proof equipment.
Explosion-proof mark format:

Ex (ia) ⅡC T4

Explosion-proof mark Explosion-proof gas group Temperature group
Explosion-proof grade description:
ia rating: Electrical equipment that cannot ignite explosive gas mixtures during normal operation, one fault and two faults.
In normal work, the safety factor is 2.0;
When a fault occurs, the safety factor is 1.5;
In the case of two faults, the safety factor is 1.0.
Note: Contacts with sparks must be provided with flameproof enclosure, airtight enclosure or double the safety factor.
ib level:
Electrical equipment that cannot ignite explosive gas mixtures during normal operation and a fault.
In normal operation, the safety factor is 2.0; in a fault, the safety factor is 1.5.
During normal operation, the sparking contacts must be protected by flameproof enclosures or airtight enclosures, and there are measures for self-display of failures. The safety factor for a failure is 1.0.


(户内、户外防腐低压电器环境技术要求) kDyc JB / T9536-1999 (Indoor and outdoor anticorrosive low-voltage electrical equipment environmental technical requirements) kDyc
Environmental conditions: g
气候条件; OFe K- climate conditions; OFe
      s"0 For example: high and low temperature; relative humidity, etc. s "0
特殊气候条件(热辐射、周围空气运动、降雨以外的水); {P Z- special climatic conditions (heat radiation, ambient air movement, water other than rainfall); {P
      C'{*2 For example: solar radiation; condensation such as C '{* 2
生物条件;例如:霉菌;真菌等; +VlO:o B- biological conditions; for example: molds; fungi; + VlO: o
化学活性物质条件(轻腐蚀条件、中等腐蚀条件、强腐蚀条件); x5P3 C- chemically active substance condition (light corrosion condition, medium corrosion condition, strong corrosion condition);
      ijipeG For example: salt spray; sulfur dioxide; hydrogen sulfide; chlorine, etc.
机械活性物质条件。 S- Mechanically Active Substance Conditions. N & U;}
      , For example: sand; floating dust; sedimentary dust, etc. ,
Corrosion protection grade sP
、户内型 mB 1.Indoor mB
    F1 \n?iO Indoor anti-corrosion type: F1 \ n? IO
    :F2 M Indoor anti-corrosion type : F2 M
、户外型 HM} 2.Outdoor HM}
    W 2 Outdoor anti-light corrosion type: W 2
    WF1 ,` Outdoor anti-medium corrosion type: WF1 , `
    WF2 1 Outdoor anti-corrosion type: WF2 1


防护等级说明(按照 EN60529/IEC529 IP protection level description (according to EN60529 / IEC529 )

 

    IP54 IP 为标记字母,数字 5 为第一标记数字, 4 为第二标记数字第一标记数字表示接触保护和外来物保护等级,第二标记数字表示防水保护等级; Protection level IP54 , IP is the marked letter, the number 5 is the first marked number, 4 is the second marked number, the first marked number indicates the level of contact protection and foreign object protection, and the second marked number indicates the level of waterproof protection;

 

( 第一个数字 ) Contact protection and foreign object protection levels ( first number )

( 第二个数字 ) Waterproof protection level ( second digit )

The first number

Protection range

Second number

Protection range

name

Description

name

Description

0

No protection

-

0

 

No protection

-

1

50mm 直径和更大的固体外来体 Protects against 50mm diameter and larger solid foreign bodies

50mm, 不应完全进入 Detector, the diameter of the sphere is 50mm, it should not enter completely

1

Water drop protection

Drops falling vertically should not cause damage

2

12.5mm 直径和更大的固体外来体 Protection against 12.5mm diameter and larger solid foreign bodies

12.5mm, 不应完全进入 Detector, the sphere diameter is 12.5mm, it should not enter completely

2

15 度时,防护水滴 When the cabinet is inclined at 15 degrees, it protects against water droplets

15 度角时,垂直落下的水滴不应引起损害 When the cabinet is tilted at an angle of 15 degrees to any side , vertical drops of water should not cause damage

3

2.5mm 直径和更大的固体外来体 Protects against 2.5mm diameter and larger solid foreign bodies

2.5mm, 不应完全进入 Detector, the diameter of the sphere is 2.5mm, it should not enter completely

3

Protection against splashing water

60 度角从垂直线两侧溅出的水不应引起损害 Water splashing from both sides of the vertical line at an angle of 60 degrees should not cause damage

4

1.0mm 直径和更大的固体外来体 Protects against 1.0mm diameter and larger solid foreign bodies

1.0mm, 不应完全进入 Detector, sphere diameter is 1.0mm, should not enter completely

4

Protective water spray

Water spray directed at the cabinet from every direction should not cause damage

5

Protection against dust

It is impossible to completely prevent dust from entering, but the amount of dust entering will not harm the equipment

5

Protective water jet

Water jets aimed at the cabinet from every direction should not cause damage

6

Dust closed

20 毫巴的低压时不应进入灰尘 The cabinet should not enter the dust at a low pressure of 20 mbar

6

Protection against strong water jets

Strong jets of water aimed at the cabinet from every direction should not cause damage

Note: The diameter of the detector should not pass through the hole of the cabinet

7

Protection against short-term water immersion

When the cabinet is immersed in water for a short time at standard pressure, there should be no immersion of water that can cause damage

8

Protection against prolonged water immersion

Can be immersed in water under specific conditions, there should be no water immersion that can cause damage

 

 

 

- 防水试验 Technical Digest - Waterproof Test

 

、范围 1.Scope

   1 8, 即防护等级代码为 IPX1 IPX8 The waterproof test includes the second characteristic number from 1 to 8, that is , the protection level code is IPX1 to IPX8 .

 

、各种等级的防水试验内容 2. Waterproof test content of various grades

   1 IPX1 ( 1 ) IPX1

    Method name: Vertical drip test

    2.11 Test equipment: drip test device and test method see 2.11

    1r/min 的旋转样品台上,样品顶部至滴水口的距离不大于 200mm Placement of sample: Place it on the rotating sample table at 1r / min according to the normal working position of the sample.

    1 0.5 mm/min Test conditions: dripping water is 1 0.5 mm / min ;

    10 min Test duration: 10 min ;

 

   2 IPX2 ( 2 ) IPX2

    15° 滴水试验 Method name: 15 ° Drip Test

    2.11 Test equipment: drip test device and test method see 2.11

    15° 角,样品顶部至滴水口的距离不大于 200mm Placement of the sample: make one side of the sample at an angle of 15 ° to the perpendicular , and the distance from the top of the sample to the drip opening should not be greater than 200mm . After each face is tried, change another. Face four times.

    3 0.5 mm/min Test conditions: Dripping water is 3 0.5 mm / min ;

    4×2.5 min (共 10 min ); Test duration: 4 × 2.5 min (total 10 min );

 

   3 IPX3 ( 3 ) IPX3

    Method name: Water spray test

    experiment method:

摆管式淋水试验 a. Pendulum tube water spray test

      ( 装置图形及其试验方法见本书 2.14) Test equipment: pendulum-type water spray test device ( see Figure 2.14 for device graphics and test methods )

      200mm ,样品台不旋转。 Sample placement: Select a swing tube with an appropriate radius so that the height of the sample table is at the diameter of the swing tube. Place the sample on the sample table so that the distance from the top of the sample tube to the sample water nozzle is not greater than 200mm . The sample table does not rotate.

 

      , 每孔为 0.07 L/min Test conditions: The water flow is calculated according to the number of water spray holes of the pendulum tube , and each hole is 0.07 L / min . 60° 弧段内的喷水孔的喷水喷向样品。 When spraying water, the spray from the spray holes in the 60 ° arc segments on both sides of the midpoint of the pendulum tube is sprayed towards the sample. The test sample is placed in the center of the semicircle of the swing tube. 60° ,共 120° The swing tube swings 60 ° on both sides of the vertical line for a total of 120 ° . (2×120°) 4s Each swing (2 × 120 °) is about 4s .

      10 min Test time: continuous water spray for 10 min .

 

喷头式淋水试验 b. sprinkler type water test

      2.14 Test equipment: Hand-held water spray test device, the device graphics and test methods are shown in this book 2.14

      300mm 500mm 之间 Sample placement: make the parallel distance from the top of the test to the nozzle of the hand-held nozzle between 300mm and 500mm

      10 L/min Test conditions: A baffle with a counterweight should be installed during the test, and the water flow rate is 10 L / min

      1 min ( 不包括安装面积 ) ,最少 5 min Test time: Calculated according to the surface area of the shell of the tested sample, 1 minute per square meter ( excluding installation area ) , minimum 5 minutes .

 

   4 IPX4 ( 4 ) IPX4

    Method name: water splash test;

    experiment method:

摆管式溅水试验 a. Swing tube type splash test

      3 )条 IPX3 a 款均相同; Test equipment and sample placement: same as above ( 3 ) IPX3 a );

      : 除下述条件外,与上述第( 3 )条 IPX3 a 款均相同; Test conditions : Except for the following conditions, they are the same as paragraph (a ) of IPX3 above ;

      90° 弧段内喷水孔的喷水喷向样品。 The water spray area is the water spray from the water spray holes in the 90 ° arc segments on both sides of the midpoint of the swing tube toward the sample. The test sample is placed in the center of the semicircle of the swing tube. 180° ,共约 360° The swing tube swings 180 ° along the vertical sides , for a total of about 360 ° . (2×360°) 12s Each swing (2 × 360 °) is about 12s .

      3 ) 条 IPX3 a 款均相同 ( 10 min ) Test time: Same as paragraph (a ) of IPX3 ( 3 ) above ( ie 10 min) .

 

喷头式溅水试验 b. Nozzle type water splash test

      3 ) 条 IPX3 b 款均相同; Test equipment and sample placement: The baffle with balance weight installed on the equipment should be removed, and the rest is the same as the above paragraph ( 3 ) IPX3 b );

      3 )条 IPX3 b 款均相同; Test conditions: Except the following conditions, it is the same as paragraph ( b ) of IPX3 above ;

      3 )条 IPX3 b 款均相同, 即按被检样品外壳表面积计算,每平方米为 1min( 不包括安装面积 ) 最少 5min Test time: The same as paragraph ( b ) of the above IPX3 ( 3 ) , that is, calculated based on the surface area of the shell of the tested sample, 1min per square meter ( excluding installation area ) for a minimum of 5min .

 

   5 IPX5 ( 5 ) IPX5

    Method name: water spray test

    6.3mm ; 装置图形及其试验方法见本书 2.14 Test equipment: the inner diameter of the water outlet of the nozzle is 6.3mm ; for the device pattern and test method, see 2.14 of this book

    2.5~3m ,水流量为 12.5 L/min (750 L/h) Test conditions: make the distance between the test sample and the water jet is 2.5 ~ 3m , and the water flow is 12.5 L / min (750 L / h) ;

    1min( 不包括安装面积 ) 最少 3 min Test time: Calculated based on the surface area of the shell of the sample being tested, 1 min per square meter ( excluding installation area ) for a minimum of 3 min .

 

   6 IPX6 ( 6 ) IPX6

    Method name: Strong water spray test;

    12.5 mm ; 装置图形及其试验方法见本书第 2.14 章; Test equipment: the inner diameter of the water outlet of the nozzle is 12.5 mm ; for the device graphics and test methods, see Chapter 2.14 of this book ;

    2.5 3m ,水流量为 100 L/min (6000 L/h) Test conditions: make the distance between the test sample and the water jet is 2.5 ~ 3m , and the water flow is 100 L / min (6000 L / h) ;

    1min (不包括安装面积)最少 3 min Test time: Calculated based on the surface area of the shell of the sample being tested, 1 min per square meter (excluding installation area) for a minimum of 3 min .

 

   7 IPX7 ( 7 ) IPX7

    Method name: short-term immersion test;

    Test equipment and test conditions: immersion tank. 1m The size should be such that the distance from the bottom of the sample to the water surface is at least 1m after the sample is placed in the immersion tank . 0.15 m The distance from the top of the sample to the water surface is at least 0.15 m .

    : 30 min Test time : 30 min .

 

   8 IPX8 ( 8 ) IPX8

    : 持续潜水试验; Method name : continuous diving test;

    , 试验条件和试验时间 : 由供需(买卖)双方商定 . 其严酷程度应比 IPX7 高。 Test equipment , test conditions and test time : agreed by the supply and demand (buying and selling) parties . Its severity should be higher than IPX7 .

 

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