Sour Gas Testing – NACE TM0198 Slow Strain Rate Tensile, Level VII,
Without (w/o) Elemental Sulfur
Material Condition
|
Environment*
|
Time to Failure (h)
|
Elong. (%)
|
R.A.
(%)
|
Time to Failure Ratio
|
Elong. Ratio
|
R.A. Ratio
|
Secondary Cracking
|
Cold-worked
|
Air
|
8.9
|
12.8
|
63.4
|
-
|
-
|
-
|
-
|
Level VII w/o S
|
8.4
|
12.1
|
63.2
|
0.95
|
0.95
|
1.00
|
No
|
*Air – single test; Level VII w/o S – triplicate tests
Sour Gas Testing – NACE TM0198 Slow Strain Rate Tensile, Level VII,
With Elemental Sulfur
Material Condition
|
Environment*
|
Time to Failure (h)
|
Elong. (%)
|
R.A.
(%)
|
Time to Failure Ratio
|
Elong. Ratio
|
R.A. Ratio
|
Secondary Cracking
|
Cold-worked
|
Air
|
8.9
|
12.8
|
63.4
|
-
|
-
|
-
|
-
|
Level VII w/S
|
8.2
|
11.7
|
62.4
|
0.92
|
0.91
|
0.98
|
No
|
*Air – single test; Level VII w/S – triplicate tests
Sour Gas Testing – NACE Standard 90 day C-Ring Test, 25% NaCl, 500 psi (3.5 MPa) H2S + 500 psi (3.5 MPa) CO2, 401°F (205°C), Test Level VII, Elemental Sulfur = 1 g/l and 5 g/l**, Applied Stress = 100% YS
Material Condition
|
Heat
|
Yield Strength (ksi)
|
Result*
|
Cold-worked
|
Heat 1
|
205.2
|
1 g/l S: Pass
5 g/l S: Pass
|
Heat 2
|
186.6
|
1 g/l S: Pass
5 g/l S: Pass
|
Heat 3
|
187.9
|
1 g/l S: Pass
5 g/l S: Pass
|
*Triplicate tests
**With stirring