Resistance to Sour Gas Environments

Sour Gas Testing – NACE TM0177 Method A Tensile Test, Test Levels II and III, 720 hours, Applied Stress = 100% YS

 
Material
Condition
Heat Yield Strength
(ksi)
Coupled to
Carbon Steel
Not Coupled to
Carbon Steel
Cold-Worked Heat 1 205 Pass Pass
Heat 2 191 Pass Pass
Heat 3 204 Pass Pass
Heat 4 233 Pass Pass
Heat 5 225 Pass Pass
Heat 6 223 Pass Pass
Heat 7 215 Pass Pass
Heat 8 222 Pass Pass

*Triplicate tests

Sour Gas Testing – NACE TM0177 Method C, 90-Day C-Ring Test,
Test Level VII:  25% NaCl, 500 psi (3.5 MPa) H2S + 500 psi (3.5 MPa) CO2
Elemental Sulfur = 1 g/l and 5 g/l**

Test Temperature: 401°F (205°C), Applied Stress = 100% YS
Material Condition: Cold-Worked

Heat Yield Strength
(ksi)
Result*
Heat 1 205 1 g/l S: Pass 5 g/l S: Pass
Heat 2 187 1 g/l S: Pass 5 g/l S: Pass
Heat 3 188 1 g/l S: Pass 5 g/l S: Pass

*Triplicate tests
**With stirring

Sour Gas Testing – NACE TM0177 Method C, 90-Day C-Ring Test, Test Level VII-Plus: 25% NaCl, 1000 psi (6.9 MPa) H2S + 1000 psi (6.9 MPa) CO2

Test Temperature: 550°F (288°C), Applied Stress = 100% YS
Material Condition: Cold-Worked
 
3 Passing Test Results
Heat Yield Strength
(ksi)
Heat 1 205
Heat 2 187
Heat 3 188
Heat 4 233
Heat 5 225
Heat 6 223
 Heat 8  222 

Sour Gas Testing – NACE TM0198 Slow Strain Rate Tensile Test, Test Level VII:  25% NaCl,
500 psi (3.5 MPa) H
2S + 500 psi (3.5 MPa) CO2Without (w/o) Elemental Sulfur

Test Temperature: 401°F (205°C)
Material Condition: Cold-Worked 

Test Environment* Time to Failure (h) Elong. (%) R.A. (%) Time to Failure Ratio Elong. Ratio R.A. Ratio Secondary Cracking
Air 8.9 12.8 63.4 - - - -
Level VII w/o S 8.4 12.1 63.2 0.95 0.95 1 No

*Air – single test; Level VII w/o S – triplicate tests

Sour Gas Testing – NACE TM0198 Slow Strain Rate Tensile Test, Test Level VII:  25% NaCl,
500 psi (3.5 MPa) H
2S + 500 psi (3.5 MPa) CO2With Elemental Sulfur

Test Temperature: 401°F (205°C)
Material Condition: Cold-Worked

Test Environment* Time to Failure (h) Elong. (%) R.A. (%) Time to Failure Ratio Elong. Ratio R.A. Ratio Secondary Cracking
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

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