Combustible Gas Generation vs.Approximate Oil Decomposition Temperature

800o C

700o C

600o C

500o C

400o C

200o C

100o C

150o C

65o C

300o C

ArcingCondition

Hot Spots(Oil IncreasingTemperature)

Partial Discharge (Not Temperature Dependent)Range of Normal Operation

Hydrogen

H2

Methane

CH4

Ethylene

C2H4

Acetylene

C2H2

2500 C

3500 C

CH4 > H2

C2H2 > 10% of C2H4

Trace

Gas Generation (Not to Scale) Approximate Oil Decomposition Temperature above 1500C

Ethane

C2H6

C2H6 > H4

C2H4 > C2H6