Duct part design rules for flanges
When creating a new design rule for a flange, you can define whether the ranges of the size rules measure the side length or the area of the cross section. This setting cannot be changed later.
Here we are editing an existing design rule that uses cross-section side length to match the size:
Here we are editing an existing design rule that uses cross-section area to match the size:
For each size range, you can define the following settings:
Rule will be applied if…
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Min size / Max size or Min cross-section area / Max cross-section area – The size range to which to apply the settings.
Beams
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Horizontal – Select the catalog part to use for the horizontal beams of the flange.
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Vertical – Select the catalog part to use for the vertical beams of the flange.
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Type of joint – Select how to form the corners of the flange.
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Connection – Select whether to use overlapped or butt weld connection.
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Setback – For overlapped connection, define the distance of the gap that is left between the straight duct end and the connection point in the flange.
Bolt holes
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Diameter, Min Spacing, Max Spacing, Horizontal offset and Vertical offset control the dimensioning of bolt holes in duct spool drawings. The effect these settings have depends on the bolt hole dimensioning style that the administrator has selected in the shared project settings, as described in Duct Spool Drawing.
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If the selected style is Default, all the parameters are in use. The distance between the holes varies between Min Spacing and Max Spacing. The offsets to the first hole are measured from the edge of the flange beam.
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If the selected style is BS EN ISO 15138:2007, only Diameter, Max Spacing, and Horizontal Offset are used in dimensioning. This is because the style dictates that Min Spacing is half of Max Spacing and that vertical offset is the same as horizontal offset. The standard specifies that maximum spacing is always 150, and you must type this number into the design rule. In this style, the distance between the first and the second hole may vary between the min and max spacing, while the distance between all other bolt holes is the same as max spacing. Horizontal offset measures the distance of the first bolt hole from the inner corner of the duct.
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