Lightnin Mixer Standards- ATEX Marking

Lightnin Mixer Standards- ATEX Marking

Published with permission from Lightnin

Marking of equipment used in potentially explosive atmospheres according to ATEX Directive 91/9/EC
(also known as ATEX 95 and ATEX 100a) and EN 13463 pt 1-8

1

2

3

4

5

6

7

II

2 G

EEx ck

IIC

T4

The following information is intended as a general summary of the most common aspects of ATEX marking legislation relevant to Lightnin’s products and should be used as a guide only.

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3. Classification of equipment

Equipment Group

Equipment Category

Atmosphere

Protection level

Required Protection Performance & Operation

I (Mines)

M1

Methane & Dust

Very High

Safe with two independent faults and must remain operational

II (Above Ground)

1

Gas, Vapour, Mist, Dust

Very High

Two independent means of protection or safe with two separate faults

II (Above Ground)

2

Gas, Vapour, Mist, Dust

High

Safe in normal operation and if common faults occur

II (Above Ground)

3

Gas, Vapour, Mist, Dust

Low

Safe in normal operation

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3,4. Conditions in the Potentially Explosive atmosphere

Flammable Material

Temporary behaviour of the flammable material in the potentially explosive atmosphere

IEC Classification of the potentially explosive atmospheres

Required marking of the applied device per ATEX

Equipment group

Equipment category

Gases, vapours

• Are present continuously, for long periods or frequently

Zone 0

II

1G

• Are likely to occur

Zone 1

II

2G

(1G equipment may be used)

• Are unlikely to occur or, if they do occur, are likely to do so only infrequently and for a short period only

Zone 2

II

3G

(1G or 2G equipment may be used)

Dusts

• Are present continuously

Zone 20

II

1D

• Are likely to occur

Zone 21

II

2D

(1D equipment may be used)

• Are unlikely to occur in case of whirled dust or, if they do occur, are likely to do so only infrequently

and for a short period only

Zone 22

II

3D

(1D or 2D equipment may be used)

Methane, dust

-

Mining

I

M1, M2 or M3

5. Methods of Protection

Method of Protection

Marking

Protection Principle

Electrical equipment for gases, vapours & mists according to CENELEC

Flameproof enclosure

EEx d

Contain the explosion & prevent flame propagation

Increased safety

EEx e

No arcs, sparks or hot surfaces

Non Sparking

EEx n

No arcs, sparks or hot surfaces

Intrinsic Safety

EEx i

Limit the energy of the spark and surface temperature

Non-electrical equipment and machinery according to 13463-1 CEN

Constructional Safety

EEx c

Design to prevent ignition sources arising

Liquid immersion

EEx k

Keep the explosive atmosphere out by immersion in fluid

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6. Classification of gases and dusts per CENELEC/IEC

Gas Group

Temperature Class

T1

T2

T3

T4

T5

T6

I

Methane

-

-

-

-

-

IIA

Ammoniac
Methane
Ethane
Propane

Ethyl alcohol
Cyclohexane
n-butane
n-hexane

Fuel in general
Aircraft fuel
n-hexane
Fuel oil

Acetaldehyde

-

-

IIB

Lighting gas
Acrylonitrile

Ethylene
Ethylene oxide

Ethylene glycol
Hydrogen sulphide

Ethyl ether

-

-

IIC

Hydrogen

Ethine (Acetylene)

-

-

-

Coal disulphide

7. Temperature Classification

CENELEC/IEC

(Group II) Classification

Max Surface Temperature

Comments

T1

450ºC (842ºF)

Temperature relates to all parts of equipment that can come into contact with the potentially explosive atmosphere

T2

300ºC (572ºF)

T3

200ºC (392ºF)

T4

135ºC (275ºF)

T5

100ºC (212ºF)

T6

85ºC (185ºF)

Tx

Maximum surface temperature not defined

Applied to closed tank units where transmission of temperature from the vessel to mixer parts cannot be controlled by Lightnin. Assessment of machine temperature class is the responsibility of the client.

EXAMPLE EQUIPMENT MARKING II 2 G EEx ck IIC T4

ATEX Category 2 (gas) equipment designated for installation in Zone 1. Protection by constructional safety and liquid immersion, suitable for hydrogen atmosphere with maximum equipment surface temperature of 135ºC.