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How to model a flanged cross pipe fitting with center of cross to face of flange measurement = 1 foot?
Creating a flanged cross in AutoPIPE is indeed possible.
A. Insert a run equal in length to the distance from the face of the cross to it's center-line.B. At that center-line go to Modify> Convert Point To/TeeC. Go to Modify> Tee and a dialog box will appear. In that dialog box, using the drop down arrows, change "Tee Component" from Tee to Cross. Also change "Type of Tee" from Welding to Other.D. New boxes will open for "SIF-In " and "Out". These will have to be updated manually as they are defualt 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.
E. After entering the SIF values, press OK button.F. Now continue to model in the rest of the cross (complete the header first and then add the 2 branches) with pipe lengths equal to the distance from the center-line of the cross to the faces of flanges. on both the header and branches.
At this time your model should be similar to the above image, The cross node point is A05 with the next node point in all 4 directions = 1 foot. As shown, the header is segment A (A12, A05, A11), with the 2 branches as segment B and K.G. Insert Flange (and specify required flange data) at each of the 4 faces of the cross.
Please note that in your model consistency check you will see a warning similar to the following:
* * * W A R N I N G - MODEL * * * W726-10: User SIF required at junction at point A02
Note: Even if you have input the SIFs for the cross, this warning will continue to appear. It is not an error and will not prevent the program from running. It is there to remind clients that a user SIF value is required for that point.
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