Use of Carbon Steel Piping at Low Temperature

[nutmeg]

From Nutmeg,
Does any one know of a design code which accomodates the use of carbon steel at temperatures below -46 (C or F)?
Typical design conditions are -55 Deg.C @ 4.5 Barg.
Is there a recognised international Code (DIN/BS)and a suitable grade of Carbon Steel?

 

Hello,

It may be of some help to look back at thread 378-19168 on this board. A few years ago, ANSI/ASME B31.3 (Process Piping) provided some new guidance for use of carbon steels at low temperatures.

Basically, the suitability of these piping materials depends upon the minimum design temperature, the material's MDMT, and how thick your pipe wall thickness will be. See ASME/ANSI B31 Code for Pressure Piping, B31.3, Process Piping, Paragraph 323.2.2(b), Figure 323.2.2A, Table 323.2.2, and Appendix A - Table A-1. Also, look at the new(er) rules in B31.3 regarding impact testing in paragraph 323.3, Figure 323.2.2B, and Table 323.3.1

In the cited thread, Pete makes an excellent observation regarding providing specific welding procedures for dissimilar carbon steels. This brings to mind the need for more rigor in specifying appropriate fabrication and examination methods for systems that are to be used in colder services.

Regards, John.

 

[Archoane]

The Canadian piping standards, CSA Z245.01, talks about low temperature requirements for pipeline transportation systems.