Corroneer
Mechanical
- Jan 13, 2006
- 63
Hi Everyone,
I have a length of piping (material falls under P No. 1 in ASME B31.3) that I am currently reviewing the corrosion circuits associated with them. I have noticed that SSC is defined as a possible damage which I tend to agree because the service is sour, but upon reviewing NACE MR0175 I noticed that in A.2.1.4 it says:
Tubular products with an SMYS not exceeding 360 MPa (52 ksi), and pressure vessel steels classified as P-No 1, Group 1 or 2, in Section IX of the ASME Boiler and Pressure Vessel Code (see A.2.2.2), are acceptable in the as-welded condition. For these products, hardness testing of welding procedures may be waived if agreed by the equipment user.
And as you know that P no 1 can be exempted from heat treatment as per ASME B31.3 (Table Table 331.1.3 of 2020 Edition).
1. Are piping considered tubular products as per NACE MR0175 definition, or tubular products refer to upstream and downhole applications? because later in the standard (e.g. in A3.3) it discussed Pipeline Steels and states clearly the hardness levels.
2. Does the statement apply to welds only not the parent material, or both?
3. Can SSC be excluded as a potential damage mechanism although we do not know the hardness of the parent material, HAZ, or the welds?
Regards,
Corroneer
I have a length of piping (material falls under P No. 1 in ASME B31.3) that I am currently reviewing the corrosion circuits associated with them. I have noticed that SSC is defined as a possible damage which I tend to agree because the service is sour, but upon reviewing NACE MR0175 I noticed that in A.2.1.4 it says:
Tubular products with an SMYS not exceeding 360 MPa (52 ksi), and pressure vessel steels classified as P-No 1, Group 1 or 2, in Section IX of the ASME Boiler and Pressure Vessel Code (see A.2.2.2), are acceptable in the as-welded condition. For these products, hardness testing of welding procedures may be waived if agreed by the equipment user.
And as you know that P no 1 can be exempted from heat treatment as per ASME B31.3 (Table Table 331.1.3 of 2020 Edition).
1. Are piping considered tubular products as per NACE MR0175 definition, or tubular products refer to upstream and downhole applications? because later in the standard (e.g. in A3.3) it discussed Pipeline Steels and states clearly the hardness levels.
2. Does the statement apply to welds only not the parent material, or both?
3. Can SSC be excluded as a potential damage mechanism although we do not know the hardness of the parent material, HAZ, or the welds?
Regards,
Corroneer
![[banghead]](/data/assets/smilies/banghead.gif "[banghead] [banghead]")
) The indication is that, even if PWHT, has not been applied, the end user can waive hardness testing for those products. Why they need to put this text in is beyond me; as the document is written, the end user can waive anything they like so long as they are prepared to take responsibility for it.
