| Applies To | |
| Product(s): | AutoPIPE |
| Version(s): | ALL; |
| Area: | Error |
| Date Logged & Current Version |
Dec 2024 12.08.01.010 |
Problem:
The following is displayed when using AutoPIPE:
* * * W A R N I N G - MODEL * * *
W726-57: Temp. for T1 is above max. temp of 450F(232C) for derating factor
at point A00 for material A53-B
How to fix this issue?
Solution:
Note this exact message above is specific to a particular model. Your message may be slightly different, naming a different Temperature, node point, and material. Regardless, the information below should still apply.
How to review this error message:
1. Examine the "Press/Temp/PipeID" tab within the input gids to identify the problematic node point (for example, A00) and the associated temperature referenced in the message (ex. 250 deg C) across all temperature cases in the model.
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- For example, confirmed message information, T1 = 250 deg C.
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2. Next, what PipeID is referenced to this node point?
Again, look at the grid information above, column labeled PipeID.
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- For example, PipeID = 20 STD.
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3. Review the PipeID to confirm material defined.
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- For example, Material = A53-B
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4. What material library is used by the model? (hint, General Model Option)
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- For example, Library = B318-16
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5. Review the material Library Specification table to see exactly the temperature range and allowablea used in this library.
Suggest using the Library Editor tool, open the indicated library, select the material, go to the SPEC table, and review the data.
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- For example, Temp range is only from -20 to 250 deg F (-29 to 121 deg C)
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6. What is the derating factor in this model? (see Results Model Options)
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- For example, the derating factor = 1.0
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7. What does this derating factor mean?
The derating factor provides a code requirement on temperature per derating factor, see ASME B31.8 - 2016, Table 841.1.8-1 for max temperature per derating factor value.
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- For example, the derating factor = 1.0, the max temperature should be 250 Deg F (121 Deg C) or lower.,
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Avoidance:
There are only a handful of suggestions to avoid this error message:
Option #1:
Lower the offending temperature case to below the value mentioned in the Temperature Derating Factor Table 841.1.8-1. This temperature should also be withing the capabilities of the material Spec table indicated above.
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- For example, for Material A53-B in Library B318-16 has a derating temperature of 250 Deg F (121 Deg C) or lower., and a material range of range of -29 to 121 deg C. Therefore, case T1 = 121 deg C or lower.
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Option #2:
Change the Code / Code year that has an accommodating set of conditions that match the design criteria.