EN13445 Unlisted Materials

[CSGWB]

Under EN13445 are materials not listed in Part 2 Annex 2 A able to be used at elevated temperatures (say 290C)? If so, what must be done to make them suitable? I am looking at a piece of equipment containing EN10216.1 P235 TR2, EN10025 S275 JR and EN10255 S195T. Are these compliant and if so what is the process to make them acceptable?

Regards

CSGWB.

 

[Drexl]

Hi,
I was wondering similarly, in what temperatures can I use EN 10216-1 P235GTR1 pipes and why? Where is it specified?

 

[ulyssess]

P235TR2 according EN 10216-1 is listed in EN 13445-2. But this standard is explicitly defined for room temperature service. Therefore you will not find minimum values at 290°C. P235GH according EN 10216-2 is the adequate steel grade for service at 290°C.
S275JR according EN 10025 is a structural steel and therefore not a harmonized standard under the pressure equipment directive and not listed in EN 13445-2. If used, a particular material appraisal is necessary. P275NH according EN 10028-2 is the adequate steel grade for service at 290°C.
S195T according EN 10255 is also a structural steel. Same comment as for S275JR
P235GTR1: I do not find this designation in EN 10216-1. P235TR1 is not listed neither in EN 13445 (pressure vessels) nor in EN 13480 (piping) as this grade does not fulfill the essential safety requirments of PED, see

http://www.tenaris.com/archivos/documents/2003/592.pdf

 

[CSGWB]

ulyssess,

Thank you for your response. What is typically required for a particular material appraisal? I assume some high temperature tensiles would need to be produced. At 290C, I cannot see any issues with the micorstructure. If we were going to above 350C, then I could accept there may be some degredation.

CSGWB

 

[ulyssess]

Conc. particular material appraisal see

http://ec.europa.eu/enterprise/sect...ing-principles-for-the-content-of-pma_en.pdf.

In my opinion your material choice will not fulfill the essential safety requirements of PED. According Guideline 7/24

http://ec.europa.eu/enterprise/sectors/pressure-and-gas/files/interpretation_materials_all_en.pdf

you need a material specification with specified minimum values at elevated temperatures confirmed by the material manufacturer. None of your materials will fulfill this requirement. A simple retesting by your own is not sufficient.
Other possible problems
- impact testing
- test frequency. E.g. S275JR as structural steel is tested only per lot. According PE-03-28 you need a testing as per corresponding EN 10028, e.g. per plate.
I suggest to use pressure vessel materials designed for elevated temperatures.

 

[CSGWB]

Thank You Ulyssess.