Notes: 

1. This example will use 4" dia pipe, but instructions can be used for any size pipe. 

Instructions

1. Model horizontal pipe
   • 
2.  While observing the double offset Expansion return see that the entire routing is comprised of tangent bends connected together. Therefore, one can make this component using 2 different methods or a combination of each method: 
   1. Method #1: Bend command
   2. Method #2: Ring command
3. Notes:
   1. This example will use both methods to showcase versatility.
   2. Bend method requires the exact coordinates of each bend's TIP point. 
   3. Ring command is easiest but requires a deep and clear understanding of using the ring command itself. 
4. Next, Using the bend command, insert an arc of 135 deg. and 40 inch rad
5. Insert Bend - use DX = 8'0.6000" bend radius = 40 inches
   • 
6. Insert Run - use Dx = -5'8.3065", Dy = 5'8.3065"
   • 
7. Insert Ring using dialog settings below:
   1. 
   2. 
8. Press Finish button
   • 
9. Insert Bend, mimic the previous steps above but backwards, Or insert a ring
10. Insert Ring using setting shown below:
    1. 
    2. 
11. Press Finish Button
    • 
12. To finish the modeling approach, add next run point and verify dimension from Start to Finish of expansion loop (should be 9'5")
    • 
13. The final verification dimension might be somewhat inaccurate due to AutoPIPE's constraint of handling numbers exceeding 9 digits.

Conclusion:

By using a bit of Trigonometry and AutoPIPE, one can effortlessly model a complex double bend expansion loop utilizing the bend command, the ring command, or a combination of both.

Note: If there are questions on the values used or settings on dialogs review your trigonometry calculations for this piping layout and AutoPIPE help for details on commands.