The image above represents total cross-sectional area of gates.

To compute for total cross-sectional area of gates, three essential parameters are needed and these parameters are **Mass of the Casting (G), Specific Speed of Pouring (K _{s})** and

**Time of Pouring (t).**

The formula for calculating total cross-sectional area of gates:

F_{s} = ^{G} / _{tKs}

Where:

F_{s} = Total Cross-Sectional Area of Gates

G = Mass of the Casting

K_{s} = Specific Speed Of Pouring

t = Time of Pouring

Let’s solve an example;

Find the total cross-sectional area of gates when the mass of the casting is 10, specific speed of pouring is 18 and the time of pouring is 9.

This implies that;

G = Mass of the Casting = 10

K_{s} = Specific Speed Of Pouring = 18

t = Time of Pouring = 9

F_{s} = ^{G} / _{tK}_{s
}F_{s} = ^{10} / _{9 x 18}

F_{s} = ^{10} / _{162}

F_{s} = **0.0617**

Therefore, the **total cross-sectional area of gates **is **0.0617 m ^{2}.**

**Calculating the Mass of the Casting when the Total Cross-Sectional Area of Gates, Specific Speed of Pouring and the Time of Pouring is Given.**

G = F_{s} x tK_{s}

Where:

G = Mass of the Casting

F_{s} = Total Cross-Sectional Area of Gates

K_{s} = Specific Speed Of Pouring

t = Time of Pouring

Let’s solve an example;

Find the mass of the casting when the total cross-sectional area of gates is 15, the specific speed of pouring is 7 and the time of pouring is 5.

This implies that;

F_{s} = Total Cross-Sectional Area of Gates = 15

K_{s} = Specific Speed Of Pouring = 7

t = Time of Pouring = 5

G = F_{s} x tK_{s}

G = 15 x 5(7)

G = 15 x 35

G = 525

Therefore, the **mass of the casting **is **525 m.**