| Applies To | |||
| Product: | AutoPIPE | ||
| First Affected Version: | 09.06.00 | ||
| Found in Version: | 11.04.00.xx | ||
| Fixed and Released in Version: | 11.04.00.xx | ||
| Area: | All | ||
| Severity: | Critical | ||
| Backlog Issue Number: | 896029 |
Behavior
• Severity: 1 - Critical
• First Affected Build: 09.06.00.xx
• Affected Product: AutoPIPE
• Affected Versions: Standard, Advance, Nuclear
• Program Affected: Yes
• Program Help Affected: No
• Documentation Affected: No
Problem Description
All thermal expansion changes made to standard materials in ASME B31.1 Table B-1 between code editions 2010 and 2012 were not included in the AutoPIPE material libraries B311-12, B311-14, B311-16. The following table illustrates the materials and temperature ranges that are unconservative..
|
Material Name |
Temperature (F) |
AutoPIPE Value |
ASME Value |
|
IC |
500 |
3.600 |
3.700 |
|
UC |
1200 |
9.600 |
9.700 |
|
CL |
1100 |
8.400 |
8.500 |
|
CL |
1200 |
9.300 |
9.400 |
|
CH |
1200 |
7.900 |
8.000 |
|
ST |
1400 |
16.000 |
16.100 |
|
AU-TYPE 309 |
1400 |
16.000 |
16.100 |
|
AU-TYPE 310 |
1400 |
16.000 |
16.100 |
|
AU |
400 |
3.700 |
3.800 |
|
AU |
1300 |
15.700 |
15.800 |
|
AU-TYPE 304 |
400 |
3.700 |
3.800 |
|
AU-TYPE 304 |
1300 |
15.700 |
15.800 |
|
AU-TYPE 316 |
400 |
3.700 |
3.800 |
|
AU-TYPE 316 |
1300 |
15.700 |
15.800 |
|
AU-TYPE 317 |
400 |
3.700 |
3.800 |
|
AU-TYPE 317 |
1300 |
15.700 |
15.800 |
|
AU-TYPE 321 |
400 |
3.700 |
3.800 |
|
AU-TYPE 321 |
1300 |
15.700 |
15.800 |
|
AU-TYPE 347 |
400 |
3.700 |
3.800 |
|
AU-TYPE 347 |
1300 |
15.700 |
15.800 |
|
AU-TYPE 348 |
400 |
3.700 |
3.800 |
|
AU-TYPE 348 |
1300 |
15.700 |
15.800 |
|
MO |
900 |
8.900 |
9.000 |
|
CU |
550 |
5.700 |
5.750 |
|
CU |
600 |
6.100 |
6.400 |
*Note: For AutoPIPE versions 9.2.1 and earlier, the Edit Model Option “Distance L/D from flange /valve to bend” was not available and the program used a distance of “0.1 inches” to search for flange / valves instead.
Steps to Repeat
To illustrate this defect, the following scenario can be considered:
Step 1: Create a new ASME B31.1 model with English units
Step 2: Insert a pipe property with any name and dimension. Use the material IC
Step 3: Insert a pipe using the pipe property created in step 2.
Step 4: Set the temperature of the pipe to 500ºF.
Step 5: Review the input grid. Note that the thermal expansion value is set to 3.600, but ASME recommends 3.700
Evaluation Criteria
The following considerations are provided to assist in your evaluation of the potential impact of this defect on the results:
Evaluate whether this defect has affected any existing models by considering the criteria below:
1. Was the model created or updated in program version 9.6 or later?
2. Was the selected material library either B311-12, B311-14 or B311-16?
3. Was any standard material listed in the above table used in the model?
4. Was the pipe at any temperature range (±100?) listed in the above table?
A 'No' to one or more of the above criteria means that this defect does not affect the model’s results. No further consideration for this model is necessary.
Workaround
Uncheck the Auto button associated with the expansion cell and manually enter the correct thermal expansion value, taken from ASME.
Solution
For each offending material used in the model, check if any node is within the temperature range that is interpolated using the library entry, and update the thermal expansion. Finally, re-run the analysis to update the model.
To assist in the screening of the models created in previous program versions for any potential impact by this defect, program shall automatically examine the model database after opening the model and generate a report (model name + "_D896029.TXT"), listing the bend intersection points of the bends potentially impacted by this defect. The program shall display the following confirmation message:
"Certain B31.1 standard materials since 2012 have unconservative thermal expansion values due to a previous program defect #896029. Would you like to review the evaluation report?"
The contents of the critical error report shall be like the following sample critical error report:
Defect #896029 Evaluation Report--------------------------------
Model Name: TEST1Model Version: 09.06.02.06Program Version: 11.04.00.05Report Filename: TEST1_D896029.TXT--------------------------------
For ASME B31.1 2012, 2014 and 2016 models, thermal expansion values of certain standard materials are unconservative due to a previous program defect #896029. Please refer to the published defect report for more details, mitigation conditions, and instructions. To assist in the screening of this model for any potential impact by this defect, program has examined the model database and has found that stress results for the stress summaries listed below may be incorrectand should be re-computed using this program version.
After saving this model or running any analysis in this version or later commercial release versions, this screening will no longer beperformed.
Standard materials potentially impacted by this defect:-------------------------------------------------------AU-TYPE 309AU-TYPE 317
Also See:
Critical and High issues released in v.11.04.00
Known Issues in AutoPIPE (Enhancements, defects, etc..)