	Applies To
	Product:	AutoPIPE
	First Affected Version:	09.05.00
	Found in Version:	10.01.00
	Fixed and Released in Version:	11.00
	Area:	Analysis
	Severity:	Critical
	Backlog Issue Number:	579963

Problem Description

If buoyancy is defined in a model and any segment is copied into the same or another model, buoyancy load will not be applied to the copied segment although program shows buoyancy is enabled for the copied segment. Same behavior can also be observed when inserting one model into another model. The stress results for the copied segment may be lower than the correct values leading to unconservative results.

Steps to Repeat

To illustrate this defect, the following scenario can be considered:

Step 1: Create a new ASME B31.3 model

Step 2: Define a new pipe identifier with the following data:

Pipe Identifier: PIP12
Nominal Diameter: 12.000
Schedule: 5S
Specific gravity of contents: 0.1
Pipe Material: A312-TP304

Step 3: Insert an anchor at the first point in the model

Step 4: Insert a run point of 10 feet in X-direction

Step 5: Define Buoyancy load with following data:

Water surface elevation: 10 feet
Specific gravity of water: 1.00
Added mass coeff (Ca): 1.00
Wind exposure factor: 0.00
Apply buoyancy to all segments: Checked

Step 6: Select and copy all points in the model

Step 7: Paste the copied points with following settings on the Paste dialog:

Connect to origin (0,0,0): Checked
Apply offset from selected points or origin: Checked
DX: 0.00 DY: 0.00 DZ: 10.0

Step 8: Analyze the model

Step 9: Generate the Code Compliance report.

Notice that the copied segment reports a lower stress value for “GR + Max P{1}” load combination.

Evaluation Criteria

The following considerations are provided to assist in your evaluation of the potential impact of this defect on the results:

1. Evaluate whether this defect has affected any existing models by considering the criteria below:

a. Was the model created or updated in program version 9.5.0 or later?

b. Was buoyancy load applied to any segment in the model?

c. Does model contain any segments that were copied or inserted?

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

Open the Segment tab of Review Component Data grid. Uncheck and check “Apply Buoyancy” checkbox for affected segments.

Solution

Program shall apply buoyancy to all segments with “Apply Buoyancy” checked.

Additionally, to assist in the screening of the models created in previous program versions for any potential impact by this defect, the program shall automatically examine the model database after opening the model and generate a report (model name + "_D637020.TXT"), listing the segments potentially impacted by this defect. The program shall display the following confirmation message:

“Buoyancy may not be applied to copied or inserted segments due to a previous program defect #637020. 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 #637020 Evaluation Report

---------------------------------
Model Name: TEST1
Model Version: 09.06.02.06
Program Version: 11.00.00.17
Report Filename: TEST1_D637020.TXT
---------------------------------

Buoyancy may not be applied to copied or inserted segments in this model due to a previous program defect #637020. 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 buoyancy was not applied to the segments listed below. Model should be re-analyzed 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 be performed.
Segment(s) potentially impacted by this defect:

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Also See: