Applies To
	Product:	AutoPIPE
	First Affected Version:	09.05.00
	Found in Version:	09.06.00.15
	Fixed and Released in Version:	09.06.00.19
	Area:	Modeling
	Severity:	Critical
	Backlog Issue Number:	139144 (11167)

Problem Description

Temperature dependent data not updated on modifying temperature for points range

Reason

When updating temperature value for a range of points through the Pressure & Temperature dialog, temperature dependent material property fields with Auto checkbox enabled may not be updated. This behavior is repeatable only if temperature values vary over the selected range and when the new temperature value entered is same as the existing temperature value displayed on the Pressure & Temperature dialog. This may cause un-conservative analysis and/or stress results.

To illustrate this problem the following scenario can be considered:

Step 1: Open ‘B313_APPENDIXS_EXAMPLE1.DAT’ sample model

Step 2: On the Pres/Temp/PipeID tab of input grid, modify Case 1 temperature value for node 15 to 300 deg F.

Note that values for auto updated fields at node 15 with the new Case 1 temperature are as
follows:

Expansion: 1.820 in/100ft
Hot Modulus: 28.3 E6 psi
Hot Allow: 20,000 psi

Step 3: Select the whole model (CTRL + A) and open modify operating pressure temperature dialog (Modify > Operating Pressure & Temperature)

Step 4: Modify Case 1 temperature value on the dialog to 500 by deleting the existing value of 500 and then retyping 500

Step 5: Hit ok to save the changes

Step 6: Open the Pres/Temp/PipeID tab of input grid

Note that the temperature value is updated to 500 deg F for node 15, but the temperature dependent material property fields with Auto checkboxes enabled (Expansion, Hot Modulus, and Hot Allowable) still display values corresponding to a temperature of 300 deg F. This will result in an un-conservative allowable stress value and may also result in un-conservative analysis results by using lower expansion/modulus values.

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 modified in program version 9.5 or later?
b. Were there any temperature dependent material property fields with Auto checkbox enabled?
c. Was a temperature update applied to a range of points, with Auto checkbox enabled, using the Pressure & Temperature dialog?

AND

Temperature values varied over the selected range and new temperature specified was same as the existing value displayed on the dialog?

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.

2. Otherwise, the following mitigation conditions should be considered:

a. If the temperature value supplied on the Pressure & Temperature dialog is lower than all of the existing temperature values for the selected range, the results may be conservative. In this case the allowable values are likely to be reported lower and calculated stress values are likely be reported higher than their respective correct values.

Note: The following measures may be taken to manually correct any models found affected by this error:

1. Disable and enable Auto checkbox for all points in the affected points range using input grid (drag copy operation may be used on Auto checkbox columns)

2. Open General model options dialog and change ambient temperature to a new value and save.

Open General model options dialog again and reset the ambient temperature to original value.

Solution:

Program should correctly update temperature dependent field values with auto update checked when temperature is modified for a range of points using the Pressure & Temperature dialog. 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 + "_D11167.TXT") listing the points that may be effected by this defect. The program will display the following confirmation message:

One or more points in this model may be affected by a previous program defect #11167 in which the temperature dependent material property field values with auto update checked may be incorrect. Would you like to review the evaluation report?

Avoidance:

1. Uncheck the “Apply only blue changes” checkbox on the Pressure & Temperature dialog when applying temperature updates over a range

2. Apply desired temperature updates to the points range through the Pres/Temp/PipeID tab of input grid (drag copy operation may be used)

Also See:

Critical and High Errors reported in AutoPIPE V8i v.09.05