Temperature, Gas Groups and Area Classification

Question 1

What gas group is Propane in?

Answer 1

2A

Question 2

What gas group is Ethylene in?

Answer 2

2B

Question 3

What gas group is Hydrogen in?

Answer 3

2C

Question 4

What gas group is Acetylene in?

Answer 4

2C

Question 5

T1?

Answer 5

450

Question 6

T2?

Answer 6

300

Question 7

T3?

Answer 7

200

Question 8

T4?

Answer 8

135

Question 9

T5?

Answer 9

100

Question 10

T6?

Answer 10

85

Question 11

What are the Gas Groups?

Answer 11

2A - Less easily ignited (Propane)
2B (Ethylene)
2C - More easily ignited (Hydrogen)

Question 12

Zone 0 - EPL, BS Zone, Atex Cert

Answer 12

Explosive gas vapour is continuously present/present for long periods of time (1000 hr)
EPL - Ga/Da
BS Zone - 0/20
Atex Cert - 1G/1D

Question 13

Zone 1 - EPL, BS Zone, Atex Cert

Answer 13

Explosive gas/vapour is likely to occur during normal operation ( 10 - 1000 hr)
EPL - Gb/Db
BS ZONE - 1/21
Atex Cert 2G/2D

Question 14

Zone 2 - EPL, BS Zone, Atex Cert

Answer 14

Explosive atmosphere is unlikely to occur (0.1-10 hr)
EPL - Gc/Dc
BS Zone - 2/22
Atex Cert 3G/3D

Question 15

What equipment level is Ga?

Answer 15

It has very high level of protection. Can be used in all zones

Question 16

What equipment level is Gb?

Answer 16

Has a high level of protection. Can be used in zone 1 and 2

Question 17

What equipment level is Gc?

Answer 17

Has enhanced level of protection. Only used in Zone 2

Question 18

What is Area Classification

Answer 18

Hazardous areas are classified in zones based on the frequency of the appearance and the duration of an explosive gas atmosphere

Question 19

What T Class’s can be used for Hexane if ignition temperature is 240 deg?

Answer 19

T3 to T6

Question 20

How are EPLs determined?

Answer 20

Determined on the basis of risk, taking into account the consequences of an ignition

Question 21

Unless marked otherwise (T amb) what temp classification are suitable for an ambient temp range?

Answer 21

-20 deg to 40 deg