Applies To
	Product:	AutoPIPE
	First Affected Version:
	Found in Version:	12.03.00.17
	Fixed and Released in Version:	12.04
	Area:	Library
	Severity:	Critical
	Backlog Issue Number:	1083320

Behavior

Problem Description

ASME B31.3 material libraries (B313-04 through B313-16) contain some incorrect material properties data. Material properties such as allowable stress, thermal expansion, or yield strength may be inconsistent with the piping standard. The code dependent materials affected are B241-6061-T6, B241-6061-T6W, B247-6061-T6, and B584-C92200. Other than these, the standard material copper (Cu) and any code dependent materials using copper as standard material are also impacted by this defect. This is further explained in the table below:

Table 1

Libraries Impacted Material Properties Impacted Temperature(°F) AutoPIPE Value ASME Value Percentage Difference(%)
B313-12 through B241-6061-T6 Allowable Stress 250 12.1 12.3 (1.65)
B313-16 300 10.6 10.5 0.95
350 7.9 8.1 (2.53)
400 5.6 5.2 7.69

Yield Strength 150 34.6 34.4 0.58
200 33.7 34.2 (1.48)
250 32.4 32.5 (0.30)
300 27.4 27.7 (1.09)
350 20.0 19.9 0.50

B313-16 only B241-6061-T6W Yield Strength 250 15.3 15.2 0.66
300 15.3 15.2 0.66
350 15.3 15.2 0.66

B313-12 through B247-6061-T6 Allowable Stress 250 12.1 12.3 (1.65)
B313-16 300 10.6 10.5 0.95
350 7.9 8.1 (2.53)
400 5.6 5.2 7.69

B313-10 through B584-C92200 Allowable Stress 100 10.6 10.7 (0.94)
B313-16 150 10.6 9.6 10.4
200 10.6 9.5 11.6
250 10.6 9.4 12.8
300 10.6 9.2 15.2
350 10.6 8.9 19.1
400 10.3 8.6 19.8

B313-04 through Cu 3 Thermal Expansion 575 5.93 6.07 2.36
B313-12

1 The units for allowable stress and yield strength are ksi. The units for thermal expansion are in./100ft.
2 Percentage values enclosed in brackets give conservative results in AutoPIPE. All other percentages give unconservative results.
3 The material affected is a standard material. Code dependent materials that use this data are B88-C12200 and B280-C12200. Thermal expansion data is taken from Table C-1 of ASME B31.3.

Steps to repeat

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

Step 1: Create a new ASME B31.3 model with code year set to ‘2012’.

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

Pipe Identifier: PIP12
Nominal Diameter: 12.0 in
Schedule: STD
Pipe Material: B247-6061-T6

Step 3: Set the pressure to 285psi and temperature to 400°F.

Step 4: Insert a rigid anchor at the first point in the model

Step 5: Insert a run point of 10 feet in the X-direction

Step 6: Analyze the model.

Step 7: Generate the code compliance report.

Notice that the report shows the code allowable for “MAX P{1}” code combination to be 5,600 psi. The actual allowable value provided in the table A-1 for
material B247-6061-T6 at 400°F is 5,200 psi.

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 9.3.0 or later?
b. Was the material library set to B313-04, B313-06, B313-08, B313-10, B313-12, B313-14 or B313-16?
c. Was any material from table 1 used in the model where the temperature of the pipe was set to the range specified (± 50°F for allowable stress and yield
strength, ±25°F for thermal expansion)?

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.
Otherwise, some possible mitigating conditions described below should be considered when evaluating the impact of this defect on the results.

2. Evaluate possible mitigating conditions on the impact of this defect on the results.

a. If the correct allowable stress and yield strength values are higher than the library data, then AutoPIPE results are conservative.

Workaround

Uncheck the auto button associated with the affected material property in the ‘Operating Pressure & Temperature’ dialog. This includes the “hot allow” row, the “Yield (Sy)” row, and the ‘Expansion’ row. Then manually enter the correct material property values from ASME B31.3 and ASME BPVC II-D.

Solution

Impacted material libraries shall be updated with the correct allowable, yield strength, and thermal expansion data.

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 + "_D1083320.TXT"), listing the pipe IDs at which the model is impacted by this defect. The program shall display the following confirmation message:

“Pipe allowable stress, thermal expansion, or yield strength may be incorrect due to a previous program defect #1083320. 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 #1083320 Evaluation Report
---------------------------------

Model Name: TEST1
Model Version: 09.00.00.08
Program Version: 11.00.00.17
Report Filename: TEST1_D1083320.TXT

---------------------------------

Code allowable stress, thermal expansion, or yield strength data may be incorrect in this model due to a previous program defect #1083320. 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, the program has examined the model database and has found that incorrect code allowable stress, thermal expansion, or yield strength were used at the pipe ID(s) 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.

Pipe ID(s) potentially impacted by this defect:
-----------------------------------------------

Incorrect allowable stress:
PIP12, STDPIP

Incorrect thermal expansion:
STDPIP

Incorrect yield strength:
PIP12

Also See:

Critical and High issues released in v.12.04.

Known Issues in AutoPIPE (Enhancements, defects, etc..)

Bentley AutoPIPE