AA Nace PPT.pdf

SKEC
Mechanical Department
NACE
MR0175/ISO
15156
500158/Neeraj Saini/Mechanical Team/2016-02-29 18:21
500158/Neeraj Saini/Mechanical Team/2016-02-29 18:21 보보문문문문무무복복및외외유유유금금금금

Contents
1. History
2. Terminology
3. Corrosion Mechanism Wet H2S
4. NACE Standards for Wet H2S
5. MR0175/ISO15156 - 2003
6.Reference

Terminology
NACE : National Association of Corrosion Engineering
EFC : European Federation of Corrosion
SSC : Sulfide Stress Cracking
SCC : Stress Corrosion Cracking
HIC : Hydrogen-Induced Cracking
SOHIC : Stress Oriented Hydrogen-Induced Cracking
SWC : StepWise Cracking
SZC : Soft-Zone Cracking
CRA : Corrosion Resistance Alloy

Corrosion Mechanism Under Wet H2S
SCC
SSC
SOHIC
HIC
ETC
SWC
Under Wet H2S Environment

SSC :
Sulfide Stress Cracking
- Fe + H2S FeS + 2Ho
- Form of Hydrogen
Embrittlement Cracking
under Tensile Stress

SCC :
Stress Corrosion Cracking
- cracking of metal
involving tensile stress
- anodic processes of
corrosion in the presence
of chlorides and water
affected by H2S, oxidants,
and elevated temperature

HIC :
Hydrogen Induced Cracking
- the recombination of
atomic hydrogen to
molecular hydrogen at weak
internal interfaces in the
material.
- dependent on the impurity
content of the material, heat
treatment and metallurgical
processing

SOHIC : Stress Oriented
Hydrogen Induced Cracking
- Related to SSC HIC.
(by TWI)
- Maximum susceptibility to
SOHIC is associated with
low to intermediate sulfur
levels 0.002 to 0.010 wt.
percent S. (by NACE )

NACE Standards for Wet H2S
MR0175-2002 SSC Resistant Metallic Materials for Oilfield
Equipment
MR0103-2003 Materials Resistant to SSC in Corrosive
Petroleum Refining Environments
MR0175-2003 Metals for SSC SCC Resistance in Sour
Oilfield Environments
MR0175/ISO15156-2003 Petroleum and natural gas
industries—Materials for use in H2S-containing environments in
oil and gas production
RP0472-2003 Methods and Controls to Prevent In-Service
Environmental Cracking of Carbon Steel Weldments in
Corrosive Petroleum Refining Environments
TM0177-96 Laboratory Testing of Metals for Resistance to
SSC SCC in H2S Environments
TM0284-2003 Evaluation of Pipeline and Pressure Vessel
Steels for Resistance to HIC

NACE Codes for Wet H2S
SSC SCC HIC ETC
MR0175
-2002
MR0175
-2003
MR0103
-2003
MR0175
/ISO
15156

MR0175/ISO15156 - 2003
Part 1 Part 2 Part 3
Cracking-
resistant
CRAs
alloys
Cracking-
resistant
CRAs
(corrosion
resistant
alloys)
and
other
alloys
Cracking-
resistant
cast
irons
Cracking-
resistant
carbon
and
low
alloy
steels,
and
the use of
cast
irons
General
principles
materials
General
principles
for
selection
of
cracking-
resistant
materials
Petroleum and natural gas industries—Materials
for use in H2S-containing environments in oil and
gas production

MR0175/ISO15156 - 2003. Part 1
• Requirement recommendation for the selection
qualification of metallic material
• Evaluation definition of service condition
• Selection of pre-qualified materials resistant to
SSC/SCC in the presence of sulfides(Part 23)
• Qualification of material for H2S service (based on
field experience lab. test)
• Report of the selection method or qualification
General principles for selection of cracking-resistant
materials

MR0175/ISO15156 - 2003. Part 2
• Requirements Recommendations for selection
qualification of carbon low alloy steels
• Qualification selection of carbon steels with
resistance to SSC, SOHIC SZC
- Option 1
Selection of SSC-resistant steels(and cast irons)
using A.2
- Option 2
Selection of steels for specific sour service
application ranges of sour service
Cracking-resistant carbon and low alloy steels, the use
of cast irons

MR0175/ISO15156 - 2003. Part 2
• Hardness Requirement
Hardness control SSC resistance
• Other fabrication methods
• HIC Test
Carbon Low alloy steel to HIC and SWC, Flat-rolled
carbon steel product only,
Test for forging w max 0.025% sulfur, and casting are
not required.
of cast irons

MR0175/ISO15156 - 2003. Part 2
Appendix
A. : SSC-resistance carbon and low alloy
steels
B. : Qualification of carbon and low alloy
steels for H2S service by laboratory testing
C. : Determination of H2S partial pressure
D. : Recommendations for determining pH
E. : Information to be supplied for material
purchasing
of cast irons

MR0175/ISO15156 - 2003. Part 3
• Requirements Recommendations for selection
qualification of CRAs other alloys
• Method
- Defining the severity of H2S-containing environment
- Selection using Annex A
Acceptable metallurgical condition
environmental limits(H2S press.,temp,CL sulfur)
- Qualification by Lab. Testing as per Annex B
- Qualification based on satisfactory field experience
complying with part 1.
Cracking-resistance CRAs and other alloys

MR0175/ISO15156 - 2003. Part 3
Appendix
A. : Environmental cracking-resistance CRAs
and other alloys
B. : Qualification of CRAs for H2S service by
Lab. Testing
C. : Information to be supplied for material
purchasing
D. : Material chemical compositions and
other information
E. : Nominated sets of test conditions
Cracking-resistance CRAs and other alloys

Reference
NACE MR0175/ISO15156-2003
NACE MR0175 interpretation
NACE MR0175 changes
Stress Corrosion Cracking by Seoul Univ.
carbon-manganese and low alloy steel in
sour service(by TWI)
Role of H2S in the behavior of engineering
alloys(NACE paper No.274)

SKEC

AA Nace PPT.pdf

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