NACE MR0103 and NACE MR0175 5

[priya17385]

Recently I came across 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?

 

[gr2vessels]

The difference is that the MR0175 applies for the harsh, upstream extraction facilities and the MR0103 applies to the downstream "refinery" environment, where most of the H2S has already been removed.
Please note that this topic has been extensively discussed on this forum, type "NACE MR0175" in the Search box on top of this page and select "Search Posts" in the advanced box. You'll find everything you need to know.
cheers,
gr2vessels

 

[NGiLuzzu]

See also thread408-202399 within this Forum.

Bye, 'NGL

 

[tsenthil]

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:



Ø Combined action of Tensile stress and H2S (Corrosive medium)

Ø Hydrogen formed in Corrosion process embrittle the matl.

Ø H2S promotes the entry of hydrogen atoms in base metal

NACE MR0175


– This standard defines Sulfide Stress Corrosion Cracking Resistant materials for Oil & Gas Field Equipments

– First Standard published by NACE in the Year 1975

– Applies only to Oil Field Equipment, Pipelines and Oil Field Processing facilities, where H2S is present.

– This Standard Specifies Proper Materials, Heat Treatment Conditions & Strength Level.

– The Standard released in 2002 is called MR0175-2002 defines materials used for Sulfide Stress Cracking for Oil & Gas/Refinery equipments, although NACE MR0175 intend to be used in Oil & Gas Field Equipments only.

– In the Year 2003, 2 more standards released. ie MR0175-2003 & ISO 15156

– MR0175/ISO15156 – Applicable to both Sulfide Stress Cracking & Chloride Stress Cracking in Oil & Gas Production facilities.

– Now a Separate standard called NACE MR0103 made available for Refinery Services.

Note that NACE MR0175 means 2002 Standard and NACE MR0175/ISO 15156 means 2003 standard.



NACE MR0175/ISO 15156 DEFINITION

“Petroleum and natural gas industries— Materials for use in H2S-containing Environments in Oil and Gas production”



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

whereas prior standards list matls. as ‘acceptable’ or ‘not acceptable’

Hope this is in line with your question

 

[stamario]

question

HDS/MHC (Hydrodesulphurisation/midllehydrocracking) is downstream or upstream enviroment???

I think that in this case we have both combination (upstream and downstream)???

 

[SJones]

Very much downstream. You won't see these units outside of a refinery and refineries are classified as 'downstream' in the overall hydrocarbon production chain. If you look at the Table of applicability for ISO 15156, you will not see mention of the units to which you refer.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdoweb/

 

[mahadhatu]

Talking about the difference in NACE MR 0103 and 0175, what is the hardness mentioned in MR 0103 for Austenitic steels used for "any equipment or components"? I have the latest NACE MR0175. It mentions 22Rc as the limit. I believe if the 0103 is for general sour environments, it would be similar to NACE MR 0175.

I need to buy MR 0103 soon !

Thanks for your input.

Anirudha Mahajan.

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Mahadhatu