The shape factor for a casting in the form of an annular

The shape factor for a casting in the form of an annular cylinder of outside diameter 30 cm, inside diameter 20 cm and height 30 cm (correction factor k = 1.0) will be

Shape factor =	L + W
	Thickness

W = πD_mean = π		30 + 20
		2

= 78.53 cm

t =	30 - 20	= 5 cm.
	2

Shape factor =	30 + 78.53	= 21.72
	5