Taylor-Wharton Auto Fill Laser Pak - Manual (Page 5)

5
3. Once the pressure in vessel A and the bulk tank are nearly equal, gas from vessel A is vented to the
atmosphere. Driven by the higher pressure in the bulk tank, liquid from the bulk tank flows into
vessel A. Vessel A is in FILLING mode.
4.
When vessel A is full, venting to atmosphere stops. Pressure in vessel A is increased by boiling
liquid in the pressure builder and returning it to the top of the vessel as gas. Vessel A is in
PRESSURIZING mode.
5.
Once pressure in vessel A reaches set point, flow through the pressure builder stops. Vessel A is in
STAND-BY mode.
6.
During the filling and pressurization process of vessel A, vessel B has been supplying an
uninterrupted flow of high-pressure liquid to the vaporizer. Pressure in vessel B is increased as
necessary by the pressure builder.
7.
When vessel B becomes empty of liquid, the system places vessel A in SUPPLY mode. Vessel B
begins the venting to bulk, filling, and pressurizing steps.
A more detailed explanation of the system operation is described in the next section, “Piping Circuits.”