Determining the Center of Gravity and Duct Weight - Intergraph Smart 3D - Help - Hexagon

Intergraph Smart 3D HVAC

Language
English
Product
Intergraph Smart 3D
Subproduct
HVAC
Search by Category
Help
Smart 3D Version
13

Duct fittings typically are manufactured from sheet metal and are generated at the job site or in the shop. The weight is calculated based on the sheet metal characteristics and volume. The amount of material depends on the surface area used to create the part and thickness. For parts generated by the catalog, the software uses reference data to calculate the weight and center of gravity.

Duct weight depends on the construction material, material thickness, cross section and cross section size. Each ducting material has a defined value for the material weight per area per thickness. For instance, galvanized sheet metal weighs 40.82 lb./ft.2, per 1-inch of thickness.

The following table summarizes the duct weight values (in lb. / ft.2 / in) of common sheet metal material in imperial units.

Common Sheet Metal Material

lb./ft.2/in

Galvanized sheet metal weight

40.82

Uncoated steel sheet metal weight

41.82

300 series stainless steel sheet metal weight

41.99

400 series stainless steel sheet metal weight

41.20

Aluminum sheet thickness (ALLOY 3003-H14)

14.256

You can calculate the center of gravity on a feature level by assuming a uniform weight. However, to determine the center of gravity for a part consisting of multiple features, you use calculations that deal with varying or non-uniform forces (called barycentric calculations). The calculation normally involves three items. When you change a value for one of the items, the other two items also change in a predictable manner.