SOUR SERVICE – THEN & NOW Jerry Bauman, P. Eng. NACE Corrosion Specialist Canadian Natural Resources Ltd.

SOUR SERVICE – THEN & NOW AGENDA GENERAL COMMENTS CARBON/LOW ALLOY STEELS AUSTENITIC STAINLESS STEELS

NACE MR0175 VARIOUS DOCUMENTS EXISTED FIRST ISSUED IN 1975 GENERAL NACE MR0175 VARIOUS DOCUMENTS EXISTED FIRST ISSUED IN 1975 LAST ISSUED IN 2003 MERGED WITH ISO END OF 2003 NOT A CORROSION DOCUMENT

GENERAL MR0103 DIRECTLY CONTRADICTS ISO DOCUMENT – STAINLESS STEEL LIMITATIONS, USE OF EXPERIENCE, REGIONS FOR CARBON STEEL, ETC. HOW DOES A METAL KNOW?

NACE MR0175-2002 (NACE) VS ANSI/NACEMR0175/ISO15156 (ISO) GENERAL NACE MR0175-2002 (NACE) VS ANSI/NACEMR0175/ISO15156 (ISO) NACE < 40 PAGES, ISO 135 PAGES NACE – OBTAIN HARDNESSES, WHEREAS ISO – WHERE TO OBTAIN HARDNESSES

GENERAL NACE – SSCC ONLY ISO – ALL MECHANISMS THAT CAN BE CAUSED BY H2S ISO – “LISTED” NOT “RESISTANT” NACE FIGURES OF APPLICABILITY, ISO NO

GENERAL END USER HAS ALWAYS BEEN RESPONSIBLE, NOT DESIGNERS, SUPPLIERS, CONSULTANTS, ETC. IF CANNOT MEET NORMAL CRITERIA CAN DO LABORATORY TESTS TWO YEARS EXPERIENCE TO QUALIFY EXISTING OR SIMILAR MATERIALS – CAREFUL OF MOP

ISO - CARBON/LOW ALLOY STEEL HRC 22/HV250 REMAIN THE SAME ISO - WELD HARDNESS QUALIFICATIONS ON TUBULAR PRODUCTS NOT REQUIRED IF SMYS ≤ 360 MPA CANNOT “EXCEED” CONDITIONS FROM A SINGLE TEST UNLESS MEETS TM0177

CARBON/LOW ALLOY STEEL ISO PROVIDES REGIONS SPECIFIC TESTING TO QUALIFY TO REGIONS 1 AND 2 IGNORE REGION 3

CORROSION RESISTANT ALLOYS 42 TABLES FOR ENVIRONMENTAL AND MATERIALS LIMITS NOT JUST H2S – TEMPERATURE, pH, SULFUR AND CHLORIDES.

STAINLESS STEELS MAJOR CHANGES TO AUSTENITIC SS NACE – HARDNESS, ISO – OPERATING CONDITIONS LIMITATIONS VALVES ORDERED TO “NACE” NO LONGER APPLICABLE UNLESS – CRA COMPONENTS HAVE NO LIMITATIONS

NICKEL-BASED ALLOYS Different classes based on composition Classes have different restrictions based on H2S levels and Temperature Ultra – conservative Can use alloy manufacturer’s data – be careful of source

SUMMARY Carbon/Low Alloy steels have fewer restrictions in ISO ISO more helpful in how to perform testing Austenitic alloys have severe restrictions in ISO Refineries – still old school