Question

what is ullage measure

Answer 1

Ullage is the void space in the tank measured from the top of the tank to the upper surface of the fluid

Answer 2

Ullage is the void space in the tank measured from the top of the tank to the upper surface of the fluid. ... After measuring sounding or ullage, it is compared in the sounding book to know the volumetric quantity of the tank. Thus, sounding of the pipe becomes sounding of the tank.