How to model a flanged cross pipe fitting with center of cross to face of flange measurement = 1 foot using Back to Back tee?
There are 2 methods of creating a Cross piping component in AutoPIPE
1. Model using Cross component
2. Model using back to back Tee components
Use procedure below to model with back to back Tee components, or click here for instructions to model with a single Cross component
A. Select a node point in the model
B. Use Insert Tee command
Length = 1 ft
Type of tee = Other
SIF in / out = enter value (ex. 1.0)
Note: The user must enter a custom SIF values as the default values are wrong. Most piping codes (i.e. ASME B31.1, B31.3, etc..) do not have SIF calculations for cross fittings. Only available options are: A. hand calculate the SIF value using other reference materials B. contact the manufacture to have them supply an SIF value, or C. analyze with an FEA application to provide the calculated value based on the cross's geometry.
Press OK to continue
C. Select the branching blue arrow, (notice the segment changed from A to *B*)
D Use insert Run command to enter branch piping, distance = 1 ft
E. Select Run arrow, notice that the segment changed from B back to A
F. Use Insert Tee command
Length = enter a small value (ex. 0.01)
SIF in / out = enter value (ex. 1.0), again enter user SIF values as mentioned above.
G. Select the branching blue arrow, (notice the segment changed from A to *C*)
Note: selecting the branch arrow is easy, by confirming current node point is A03, and then press the UP arrow on the keyboard
H. Use insert Run command to enter branch piping, distance = 1 ft
I. Select Run Arrow from node point A03.
Note, selecting the arrow is easy using the keyboard arrows Up / Down switches between connected segments at a node point, Left / Right arrow moves up and down the segment respecively.
J. Use insert Run command to enter branch piping, distance = 1 ft
K. The cross piping is complete
L. Add additional piping in all directions from the Cross as needed
M. To add the flanges, first start by selecting all 4 node points where the flanges are to be inserted. Then use insert Flange command
Configure flange dialog as needed
N. Done
Tee, Cross, or Branch Piping Components - Modeling Approaches
Bentley AutoPIPE