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Click Assemblies on the Model panel.
The Assemblies palette displays.
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Click Stair .
The Stair palette displays.
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Click Cylindrical .
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Select a Template.
OR
Fill in the stair data as needed. For more information, see Stair.
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Select Points from the Place By list.
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Click Insert.
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Click the top center point for the spiral stair. You can click this point on a vessel or anywhere in the model space.
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Click the bottom center point for the spiral stair. You can click this point on a vessel or anywhere in the model space.
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Click to specify the top point anywhere around the top of the cylinder on the vessel.
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Click to specify the bottom point anywhere around the bottom of the cylinder on the vessel.
This prompt only displays when you check Define Exit Point on the Cylindrical tab.
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Select Clockwise or COunter clockwise for the direction placement around the vessel.
The software places the stair around the vessel.