A requirement where the customer wanted complaince to NACE MR0103.What is the main difference between NCE MR 0175 and MR 0103. Is the key difference there in the environmental conditions under which sulphide stress cracking occurs? NACE International founded in Year 1943 for recommending materials for Oil & Gas Industries and since 1943 it has produced more than 100 standards. NACE Mission – To Protect People, Assets & Environment from the effects of Corrosion & Sulfide Stress Cracking: Some Comparison between NACE MR017-2002 & NACE MR0175-2003/ISO 15156 1. 2003 Standard addresses both Sulfide Stress Cracking & Chloride SC whereas 2002 standard address only SSC. 2. New Welding Procedure Qualification Records (PQR) to include Hardness survey along the Weld and HAZ to ensure proper hardness 3. Envt. restrictions on all Corr. Resistant Alloys (CRAs) except Carbon Steels and Low Alloy Steels in terms of 1. H2S partial pressure 2. Max. temp 3. ppm Chlorides 4. Presence of free sulphur

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