Taylor-Wharton Microbulk Tanks - Manual (Page 13)

TW-407 Rev.-
11
Pressure Building Circuit
The pressure building circuit serves to build pressure after filling the vessel. The circuit is also used
to ensure sufficient driving pressure during high product withdrawal periods. Opening the pressure
building outlet valve (V-6) and pressure building inlet valve (V-7) permits the circuit to function. When
the pressure inside the vessel drops below the pressure builder setting, the pressure building regulator
(PCV-1) opens. This creates a path from the liquid in the bottom of the container to the gas space in
the top. This path contains an external pressure building coil (PBC-1) to vaporize product as it flows
from the bottom to the top of the vessel. Liquid is expanded to a vapor and pressure is increased in
the vessel.
Figure 4: Pressure building circuit highlighted
PBC-1
PCV-1
S-1
CN-6
V-7
SV-3
Pressure Building Circuit