The image above represents pouring time for medium-sized and large casting up to 1000kg in mass.

To compute for pouring time for medium-sized and large casting up to 1000kg in mass, three essential parameters are needed and these parameters are **Co-efficient used to Account for Wall Thickness (S), Mass of Casting with Gates and Risers (G)** and **Thickness of the Casting (δ).**

The formula for calculating pouring time for medium-sized and large casting up to 1000kg in mass:

t = S(Gδ)^{1 / 3}

Where:

t = Pouring Time for Medium-Sized and Large Casting up to 1000kg in Mass

S = Co-efficient used to Account for Wall Thickness

G = Mass of Casting with Gates and Risers

δ = Thickness of the Casting

Let’s solve an example;

Find the pouring time for medium-sized and large casting up to 1000kg in mass when the co-efficient used to account for wall thickness is 9, mass of casting with gates and risers is 12 and thickness of the casting is 21.

This implies that;

S = Co-efficient used to Account for Wall Thickness = 9

G = Mass of Casting with Gates and Risers = 12

δ = Thickness of the Casting = 21

t = S(Gδ)^{1 / 3}

t = 9 x (12 x 21)^{1 / 3}

t = 9 x (252)^{0.33}

t = 9 x 6.31

t = **56.84**

Therefore, the **pouring time for medium-sized and large casting up to 1000kg in mass **is **56.84 s.**

**Calculating the Co-efficient used to Account for Wall Thickness when the Pouring Time for Medium-Sized and Large Casting up to 1000kg in Mass, the Mass of Casting with Gates and Risers and the Thickness of the Casting is Given.**

S = ^{3}√(^{t}^{3} / _{Gδ})

Where;

S = Co-efficient used to Account for Wall Thickness

t = Pouring Time for Medium-Sized and Large Casting up to 1000kg in Mass

G = Mass of Casting with Gates and Risers

δ = Thickness of the Casting

Let’s solve an example;

Find the co-efficient used to account for wall thickness when the pouring time for medium-sized and large casting up to 1000kg in mass is 30, mass of casting with gates and risers is 18 and the thickness of the casting is 20.

This implies that;

t = Pouring Time for Medium-Sized and Large Casting up to 1000kg in Mass = 30

G = Mass of Casting with Gates and Risers = 18

δ = Thickness of the Casting = 20

S = ^{3}√(^{t}^{3} / _{Gδ})

S = ^{3}√(^{30}^{3} / _{18 x 20})

S = ^{3}√(^{27000} / _{360})

S = ^{3}√(75)

S = 4.21

Therefore, the **co-efficient used to account for wall thickness **is **4.21.**