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Low temp. piping 3
- Thread starter Kamakal
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Kamakal & SJones...
Could you tell us all what the content of those paragraphs were ?
It is my understanding that carbon steel cannot be used below -20F based on the allowable stress tables in both ASME B31.3 and B31.1 ??
A little more information ???
Could you tell us all what the content of those paragraphs were ?
It is my understanding that carbon steel cannot be used below -20F based on the allowable stress tables in both ASME B31.3 and B31.1 ??
A little more information ???
Why don't you take a look at the indicated subclause in order to check its content.
Steve Jones
Materials & Corrosion Engineer
Steve Jones
Materials & Corrosion Engineer
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To MJCronin,
The Table 323.2.2 note 3.) has statement,
(3) Impact testing is not required if the design minimum temperature is below ?29°C (?20°F) but at or above ?104°C (?155°F) and the Stress Ratio defined in Fig. 323.2.2B does not exceed 0.3 times S.
which may have some people thinking it is OK to use carbon steel below -20F, but it does set -155F extreme limit.
The ASME B31.3 Chapter III Materials has almost 8 pages of guidance, requirements, and limits for applying materials for temperatures below ambient conditions. I think that is one reason SJones would have anyone read the subclause in the context of the whole paragraph. There are also considerations for fluid service, listed grades of carbon steel, thickness, welding procedures, along with impact testing requirements that are used with the Table A-1 allowables plus the Table 323.2.2; Fig 323.2.2A; Fig 323.2.2B; Table 323.3.1; Table 323.3.4; and Table 323.3.5.
'A little bit of knowledge can be dangerous.'
The Table 323.2.2 note 3.) has statement,
(3) Impact testing is not required if the design minimum temperature is below ?29°C (?20°F) but at or above ?104°C (?155°F) and the Stress Ratio defined in Fig. 323.2.2B does not exceed 0.3 times S.
which may have some people thinking it is OK to use carbon steel below -20F, but it does set -155F extreme limit.
The ASME B31.3 Chapter III Materials has almost 8 pages of guidance, requirements, and limits for applying materials for temperatures below ambient conditions. I think that is one reason SJones would have anyone read the subclause in the context of the whole paragraph. There are also considerations for fluid service, listed grades of carbon steel, thickness, welding procedures, along with impact testing requirements that are used with the Table A-1 allowables plus the Table 323.2.2; Fig 323.2.2A; Fig 323.2.2B; Table 323.3.1; Table 323.3.4; and Table 323.3.5.
'A little bit of knowledge can be dangerous.'
Thank you. The volume of material was one reason, the other was copyright!
Steve Jones
Materials & Corrosion Engineer
Steve Jones
Materials & Corrosion Engineer
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