1 Classification of Hazardous Areas V00 - Endress+Hauser€¦ · Classification of flammable gases...

07/15/2016

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INTERNAL

Installation considerations for hazardous areas

Classification of Hazardous Areas

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07/15/2016INTERNAL

The world of hazardous classification Classification of Hazardous Areas

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ATEX / IEC Ex Device declarationClassification of Hazardous Areas

Use the deviceunder ground or above ground ?

In which Zoneyou can use the device ?

How the device is designed to avoid an explosion ?

What is the max ignitionenergy can be exposed from the device ?

What max ignition surface temp can appear on the device ? Ta & Tp !!!

In which Zone you can use the device ?

Equipment group

Equipment category

Protection Type

Gas group Temperature class

Equipment Protection Level

ATEX II 1/2G Ex de IIC T2-T6 Ga/GbIECEx - - Ex de IIC T2-T6 Ga/GbExplosion Protection

(CP00021Z)- 18 12-15 6 6 18

Explanation table based on Safety Instructions Liquiphant M/S (XA00108F-G)

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07/15/2016INTERNAL

Equipment group - ATEXClassification of Hazardous Areas

I• Under ground (mining, etc) • Special requirements to the housing, besides Ex.• E+H does not provide instruments

II • all above ground applications• E+H does provide instruments

IECEx covers this equipment class classification (e.g. Ga/Gb)

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Zone Classification according to ATEX

Zones are classified according the probability of the occurrence of explosive mixtures

Zone 0

Zone 1Zone 2

Fluid

Occurrence of explosive

atmosphere

Gas mixtures

Dust mixtures

Not likely to occur or only for short

periodZone 2 Zone 22

Likely to occur occasionally Zone 1 Zone 21

Continuously or for long periods or

frequentlyZone 0 Zone 20


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Equipment classification according to ATEX

Equipment category Group IMining industry

Group II(IIA/IIB/IIC)

Gas-/Dust-ExNormal level ofprotection (safe without fault)

3G/3DNormal level ofprotection (safe without fault)

High level of protection (safe with 1 fault) M2 2G/2D

Very high level of protection (safe with 2

faults)M1 1G/1D


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07/15/2016INTERNAL

Equipment classification according to IEC

Equipment category Group IMining industry

Group II(IIA/IIB/IIC)

Gas-Ex

Group III(IIIA/IIIB/IIIC)

Dust-ExNormal level ofprotection (safe without fault)

Gc Dc

High level of protection (safe with 1 fault) Mb Gb Db

Very high level of protection (safe with 2

faults)Ma Ga Da

Ignition energyIIC>IIB>IIA

• IIIA flyings• IIIB non –conductive

dusts• IIIC conductive dusts

(IIIC>IIIB>IIIA)


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Equipment designation to zones

Gas - Ex

Zone 0 Zone 1 Zone 2ATEX category 1G 1G or 2G 1G or 2G or 3G

IEC (EPL*) Ga Ga or Gb Ga or Gb or Gc

Dust - Ex

Zone 20 Zone 21 Zone 22ATEX category 1D 1D or 2D 1D or 2D or 3D

IEC (EPL*) Da Da or Db Da or Db or Dc

* EPL = Equipment Protection Level


Slide 8 P.Conen

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Classification of flammable gases, vapors, mistsClassification of Hazardous Areas

Hot surface Sparks

Ignition temperature Ignition energy

Temperature classT1 … T6

Gas-GroupA … C

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Ignition temperature – surface temperatureClassification of Hazardous Areas

Fuels Apparatus

Ignition temperature

of gas

Ignition temperature Temperature class Max. surface temperature

Surface temperature depends on:• Ambient

temperature

• Process temperature

• Internal heating sources (e.g. electrical components)

>450°C

>300°C … ≤450°C

>200°C … ≤300°C

>135°C … ≤200°C

>100°C … ≤135°C

>85°C … ≤100°C

T1

T2

T3

T4

T5

T6

450°C

300°C

200°C

135°C

100°C

85°C

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Ignition temperature – surface temperatureClassification of Hazardous Areas

0

100

200

300

400

500

600

T1>450°C

T2 >300°C ≤450°C

T3 >200°C ≤300°C

T4 >135°C ≤200°C

T5 >100°C ≤135°C

T6 >85°C ≤100°C

Ignition temperature of gas

Surface temperature of apparatus

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Minimum ignition energyClassification of Hazardous Areas

Ignition energy in relation to hydrogen and propane air/gas concentration

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Explosive concentrations of flammable mixturesClassification of Hazardous Areas

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Classification of flammable gases and dusts in groups Classification of Hazardous Areas

Gas groupEurope/IEC North America Min. ignition energy Examples

CA > 10 μJoules Acetylene,

Carbon disulphide

B > 20 μJoules Hydrogen

B C > 60 μJoules Ethylether,Ethylene

A D > 160 μJoulesAcetone, Ammonia, Benzene, Butane,

Cyclopropane, Ethanol, Gasoline, Hexane, Methanol Naphtha, Propane

Dust groupEurope/IEC North America Kind of dust Examples

- E Metal dusts -

- F Coal dusts -

- G Others -

Slide 14 P.Conen

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Classification of flammable gases, vapors, mists

Classification of gases and vapors inexplosion groups and temperature classes

Gas-group T1(>450°C)

T2(>300°C ≤450°C)

T3(>200°C ≤300°C)

T4(>135°C ≤200°C)

T5(>100°C ≤135°C)

T6(>85°C ≤100°C)

I Methane

II A AcetoneEthaneAmmoniaBenzeneEthanic acidEthylacetateKohlenoxydMethanolPropaneToluol

Ethyl alcoholi-Amylacetatn-Butanen-Butylalkohol

GasolineDiesel fuelAircraft fuelHeating oiln-Hexane

AcetaldehydeEther

II B Lighting gas EthylEthyl oxyd

Ethyl glycol Ethyl ether

II C Hydrogen Acetylene Carbon disulphide

Ex IIB T3


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07/15/2016INTERNAL

Protection typesClassification of Hazardous Areas

Slide 16 P.Conen

Protection measures Gas-Ex marking example

air

pPressurized apparatus EEx p T5electrical parts are purged and pressurized with a protective gas (air or inert gas)Installation: purge and pressure control/shut down device

powder

Powder filling EEx q T4electrical parts are submersed in a quartz powder

oil

Oil immersion EEx o T3electrical parts are submersed in oil

07/15/2016INTERNAL

Protection typesClassification of Hazardous Areas

Slide 17 P.Conen

Increased safety Ex e T4prevention of ignition sources by fail safe design (only simple electric components)Intrinsic safety Ex ia IIC T4Limitation of the energy stored in the electrical circuits„simple“ apparatus, „associated“ apparatus, safety barriersInstallation: safety values (Uo, Io, Po, Lo, Co) and clearences

Advantage: Hot plugging for Ex ia, ib, ic without permission in the hazardous area!

Flameproof enclosure Ex db IIC T6internal explosion is confined by solid and flame tight enclosureInstallation: Ex d cable entry or conduit systems or Ex e terminal

Protection measures Gas Ex marking example

07/15/2016INTERNAL

Types of protection of electrical apparatus

Type of protectionGas atmosphere

(Equipment category / EPL)Dust atmosphere

(Equipment category / EPL)1G / Ga 2G / Gb 3G / Gc 1D / Da 2D / Db 3D /Dc

Flameproof enclosures da db dcIncreased safety eb ecIntrinsically safety ia ib ic ia ib icEncapsulation ma mb mc ma mb mcOil immersion obPowder filling qbPressurized enclosures pxb/pyb pzc pb pcProtection by enclosure ta tb tcEnergy limited apparatus nLRestricted breathing enclosures nRNon sparking apparatus nASparking apparatus nC


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Safety Instructions Liquiphant M/S (XA00108F-G)Classification of Hazardous Areas

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Cover sheet

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