Routing a sloping system attached to an equipment nozzle
Routing sloped piping
The easiest way to design sloping systems in AutoPLANT involves first placing a routing line and then placing components automatically on the centerline (AutoFIT, AutoPIPE). The example procedure below describes placing a sloped system using this technique.
1. Place a flange or similar attachment true to the equipment nozzle. You can not slope a connection at the equipment connection so the first component must be aligned with the equipment nozzle. Alternately you can actually slope the nozzle using one of the nozzle types that provides for angular offset such as the “scew” nozzle type. .
2. Route a centerline using the ‘From dialog’ router.
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3. Enter information in the routing line properties dialog to match the nozzle
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4. Start the routing line from the hub (buttwelded end) of the flange.
5. Press the key to active the router options.
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6. Select Rise-Run option.and press key or hit Ok button.
7. Enter the appropriate rise-run. This example uses ¼” per foot.
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Indicate the slope direction. From plan view Towards will slope up and Away will slope down. Take care not to route sloped pipe using this method from a non-orthogonal viewport. The “towards” and “away” options will actually slope the pipe relative to the view direction.
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8. Repeat the procedure described in step 7 for each segment of the sloped line.
9. Place the fittings using the Piping/Piping Tools/AutoFIT … menu option.
10. Place the piping using the Piping/Piping components\AutoPIPE menu option.
Understanding Connection tolerances
Connecting sloping systems to non-sloping components (like equipment nozzles) often requires some special considerations. In the example sloped system designed above it is likely that the AutoPIPE function was unable to place one or more of the pipe segments
AutoPLANT expects the angles of the connected ports of any joint to be aligned within certain tolerances. The tolerances vary depending on the joint used. Here's how it works:
When a component is placed against another component the systems scans the ports of the two compoenents and validates the data of the two ports against the various joints defined (flanged, buttwelded, etc.) if more than one joint is available for the two ends then the user is prompted with which one to use. Once a joint type is defined the joint is validated to make sure the two ports are aligned. This is done by comparing the distances of misalignment measured at the outside diameter of the pipes. In the example shown below a line sloping ¼” per foot will result in an angular offset of 1.19349deg. For a 6” pipe this translates to a misalignment of 0.13799 measured at the outside diameters of the two pipes. Since the default misalignment value for a butt welded connection is 1/16” (0.0625”) this joint is not valid and will not allow the pipe to connect.
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These tolerances are delivered with the product with conservative values as a default. All of these values can be configured in the project as required. To enable the placement of the 6” pipe at a ¼” per 1’-0” slope you would need to alter the MAX_BUTTWELDSLOPE_TOLERANCE value to a value greater than 0.13799. This is done using the Project Administrator application.
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1. Start Project Administrator
2. Open your project
3. Navigate to the System/Main node in the project tree.
4. Edit the Welded slope tolerance to a number greater than our misalignment (say… 0.2?)
5. Save the project
6. Re-open the model and verify a pipe can be placed.
Note: You must manually place the pipe connecting misaligned ports. The AutoPIPE feature will only connect components that are exactly aligned (and co-linear). This limitation is required so that AutoPIPE will not place pipe inappropriately and also to optimize the placement of pipe in larger models by preventing AutoPIPE from needing to consider the alignment of each potential combination of ports in a model.
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Change this value for butt welded connections.
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