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Resistance to Sour Gas Environments

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

Material Condition Heat Coupling Result*
Cold-worked Heat 1 Coupled to Carbon Steel Pass
NOT Coupled to Carbon Steel Pass
Heat 2 Coupled to Carbon Steel Pass
NOT Coupled to Carbon Steel Pass
Heat 3 Coupled to Carbon Steel Pass
NOT Coupled to Carbon Steel Pass

*Triplicate tests

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 TM0198 Slow Strain Rate Tensile, Level VII, Test Environment: 25% NaCl, 1000 psi (6.9 MPa) H2S + 1000 psi (6.9 MPa) CO2,
Material Condition: Cold-worked

Test Temperature Environment* Time to Failure (h) Elong. (%) R.A. (%) Time to Failure Ratio Elong. Ratio R.A. Ratio Secondary Cracking
500°F 260°C Air 5.4 7.8 50.2 - - - -
Test Environment 5.2 7.6 50.3 0.96 0.97 1.00 No
550°F 288°C Air 5.3 7.6 51.2 - - - -
Test Environment 5.4 7.8 49.6 1.02 1.02 0.97 No

*Air – single test; Test Environment – 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

Sour Gas Testing – NACE Standard 90 day C-Ring Test, 25% NaCl, 1000 psi (6.9 MPa) H2S + 1000 psi (6.9 MPa) CO2, 550°F (288°C), Test Level VII, Applied Stress = 100% YS

Material Condition Heat Yield Strength (ksi) Result*
Cold-worked Heat 1 205.2 Pass
Heat 2 186.6 Pass
Heat 3 187.9 Pass

*Triplicate tests

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