A cylindrical job with diameter of 200 mm and height of

A cylindrical job with diameter of 200 mm and height of 100 mm is to be cast using modulus method of riser design. Assume that the bottom surface of cylindrical riser does not contribute as cooling surface. If the diameter of the riser is equal to its height, then the height of the riser (in mm) is

According to modulus method M_R = 1.2 M_C

	V			= 1.2		V
	As		_R			As		_C

If diameter of riser = height of riser for top riser D = H
⇒ D = 6 M_C

D = 6 ×	(π/4) × (200)² × 100
	2 × (π/4) × (200)² + π × 200 × 100

D = H =	6 × 200 × 100	= 150 mm
	400 + 400