A rectangular tank measuring 25mx 12m x8m has an ullage pipe projecting 0.3m above the tank top. find the mass of SW in the tank when the ullage is 3.3m.

Volume of the rectangular tank = ( L x B x H)
= (25 x 12 x 8 )

Pipe above the tank top is 0.3m

Total ullage =3.3m

Ullage inside the tank = (3.3 -0.3)
= 3m

Depth of the SW = (8 – 3)
= 5m

Volume of the SW = (L x B x H )
= ( 25 x12 x5)
= 1500 m³

Mass of the SW = (volume x density)
                                 = (1500 x1.025)
                                 = 1537.5 t