Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
(OP)
I need help on this issue, please
For 14" 4500 kPa(g) super heated steam system, based on design conditions, the wall thicnkess required is 0.75" for NPS 14. Piping Material is A-106 Gr B
MDMT is -29 Degree C
Based on ASME B31.3 Figure 323.2.2A & combination of nominal thickness 0.75” (19.05 mm) & MDMT of -29 C comes below the Curve B, therefore, impact testing is required for A-106 Gr. B Material or i have to use low temp carbon steel A 333 Gr. 6 as per client specification.
I never heard of use of LTCS material for super heated steam line. At the same time the pipe will never be subjected to -29 C in service. This line is also insulated.
Yes if the line is out of service for a duration of time during extreme cold of -29 C, the pipe material can see this temperature but the line will not be pressurized at that point.
For impact testing, do we need to consider pressure as well extreme cold temperature of -29 C at the same time? How can i jsutify that the use of LTCS for superheated line is overkill.
Woudld highly appreciate your feedback.
Thanks,
For 14" 4500 kPa(g) super heated steam system, based on design conditions, the wall thicnkess required is 0.75" for NPS 14. Piping Material is A-106 Gr B
MDMT is -29 Degree C
Based on ASME B31.3 Figure 323.2.2A & combination of nominal thickness 0.75” (19.05 mm) & MDMT of -29 C comes below the Curve B, therefore, impact testing is required for A-106 Gr. B Material or i have to use low temp carbon steel A 333 Gr. 6 as per client specification.
I never heard of use of LTCS material for super heated steam line. At the same time the pipe will never be subjected to -29 C in service. This line is also insulated.
Yes if the line is out of service for a duration of time during extreme cold of -29 C, the pipe material can see this temperature but the line will not be pressurized at that point.
For impact testing, do we need to consider pressure as well extreme cold temperature of -29 C at the same time? How can i jsutify that the use of LTCS for superheated line is overkill.
Woudld highly appreciate your feedback.
Thanks,





RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
In the original post, if you can ensure that startup procedure will ensure that pressurizing is in a controlled manner with metal temperature simultaneously taken care of, you can definetely defend your decision for avoiding impact test.
RE: Use of Low Temp Carbon Steel piping material for 4500 kPa Super Heater Steam
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.