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

GENERALNACE 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?

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