Fault Type

T1

T2

T3

D1

D2

Ratio Symbol

Gas Ratio

Thermal Fault

<300˚C

Thermal Fault

300˚C - 700˚C

Thermal Fault

>700˚C

Low Energy

Discharge

High Energy

Discharge

Dornenburg Ratios

R1

CH4/H2

1.0 < R1

R1 < 0.1

0.1 < R1 < 1.0

R2

C2H2/C2H4

R2 < 0.75

0.75 < R2

R3

C2H2/CH4

R3 < 0.3

R3 < 0.3

0.3 < R3

R4

C2H6/C2H2

R4 < 0.4

0.4 < R4

R4 < 0.4

Roger Ratios

R1

CH4/H2

1.0 < R1

1.0 < R1

1.0 < R1

R1 < 0.1

0.1< R1 <1.0

R2

C2H2/C2H4

R2 < 0.1

R2 < 0.1

R2 < 0.1

R2 < 0.1

1.0 < R2 < 3.0

R5

C2H4/C2H6

1.0 < R5 < 3.0

1.0 < R5 < 3.0

3.0 < R5

R5 < 1.0

3.0 < R5