| Applies To | |||
| Product(s): | AutoPIPE | ||
| Version(s): | 2004, XM, V8i | ||
| Environment: | N/A | ||
| Area: | Settings | ||
| Subarea: | |||
| Original Author: | Bentley Technical Support Group | ||
| Date Logged & Current Version | Feb. 2015 09.06.01.10 | ||
Problem:
Answer:
Scenario #1:
I have an ambient temperature (at install) of 10 deg. and I have operating temperatures of the pipes from 15 deg C to 40 deg C which I have input as different cases. My problem is that there are 2 different rooms which the 1 system run s through, one has a temperature of 40 deg and the other of 20 deg. is there a way to apply different temperature cases to part of the pipe system only.
Answer:
AutoPIPE has only one Ambient temperature settings that is considered as your installation temperature.
As mentioned above, the installation temp is 10 deg, Recommend using that value and then enter specific operating conditions T1/P1....Tn/Pn as needed. Each of these operating conditions would account for the different temp. /press. along the pipe.
An option in Tools> Model Options> Results allows you to automatically add or remove thermal ranges. See AutoPIPE online help for details on "Number of thermal ranges = " . Also, on the same dialog screen, if "Include Maximum Range combination" check box option is checked ON, the program will automatically create a special code combination called "Max Range" that stores the results of the maximum thermal range stress case, e.g. T1 to T3, including thermal ranges from ambient temperature, e.g. Am to T1. This option is useful when the maximum expansion stress due to thermal range loadings only is required rather than generating every thermal range code combinations explicitly.
Examples:
Operating condition #1 - (T1 / P1)
System is running at high speed-
Press / Temp for all piping = 1.37 N/mm^2 / 40 deg C
Operating condition #2 - (T2 / P2)
System is running at low speed-
Press / Temp for all piping = 0.67 N/mm^2 / 15 deg C
Operating condition #3 - (T3 / P3)
System is off -
Pressure for all piping = 0.00 N/mm^2
However, assuming that the temp in room is same temp as pipe when the system has be shut down: some piping will have T3 = 20 deg C; while other parts of the piping system, T3 = 40 deg C.
Scenario #2:
Project has a provision for ambient temperature to range from 10 deg f to 70 deg f. How to apply this range in a model?
Answer:
AutoPIPE has only one location to enter an ambient temperature (General Model Options). Therefore suggest to enter the maximum ambient temp run the analysis. Create a 2nd model and change the minimum ambient temperature and re-run the analysis.
See Also
External Links
Bentley Technical Support KnowledgeBase
Comments or Corrections?
Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to
the "Comments" area below. THANK YOU!