NACE MR 0175 require the pipe material anti sour service for LSAW steel pipe.Such as H2S gas transportation. Special Test for NACE: Chemical Component Analysis especially for S,P content.Hardness Vicker test usually performed.HIC/SWC test will be carried out according to NACE TM0284.Or if agreed in an alternative test.refer to ISO15156 Table B.3.SSC test will be carried out according to NACE TM0177,Solution A.A four-point bend test piece in accordance with ISO7539-2 or ASTM G39 shall be used and test duration shall be 720 hours. If agreed an alternative test accept refer to ISO15156.
Qualification validity |
Test type ab |
Applied stresscd |
Environment |
H2S partial pressure |
Acceptance criteria |
Remarks |
Specific application or SSC region 1 or region 2 of Figure 1
|
UT |
≥90% AYS
|
5% mass fraction NaCl + 0,4% mass fraction CH3COONa, h adjusted to required value using HCl or NaOH0 |
Appropriate to intended application or SSC region |
No SSC cracks in accordance with NACE TM0177 assessment method
|
Specific application or less service environments. Region qualification subject to adequate coverage g |
FPB or CR |
||||||
DCB h |
Notapplicable
|
Assessment shall be in accordance with NACE TM0177. Acceptance criteria shall be by documentedagreement
|
Use as qualification at equipment user’s discretion and with documented justification
|
|||
All SSC region of Figure 1
|
UT |
≥80% AYS
|
NACE TM0177-05 Environment A (5% mass fraction NaCl + 0,5% mass fraction CH3COOH)
|
100 kPa (15 psi) in accordance with NACE TM0177
|
No SSC cracks in accordance with NACE TM0177 assessment method
|
---- |
FPB or CR |
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DCB h |
Notapplicable |
Assessment shall be in accordance with NACE TM0177. Acceptance criteria shall be by documented agreementk |
Use as qualification at equipment user’s discretion and with documented justification |