Taylor-Wharton Microbulk Tanks - Manual (Page 16)

TW-407 Rev.-
14
Instrumentation Circuits
Instrumentation Circuits
The instrumentation consists of a pressure gauge and liquid level gauge or differential pressure gauge.
The pressure gauge (PI-1) displays the inner vessel pressure in pounds-per-square-inch and kilo pascals.
The liquid level gauge (LI-2) measures the difference in pressure between the top and bottom of the
vessel. Product within the vessel creates a higher pressure at the bottom of the vessel than at the top.
Readings on the liquid level gauge are in inches of water. This reading, when compared to the contents
chart attached to the front of the vessel, allows accurate monitoring of the amount of product within
the vessel.
Isolation valves (V-8 and V-10) allow maintenance of the circuit without emptying and depressurizing
the vessel. The equalization valve (V-9) must be opened before the isolation valves are closed. Two
¼” female pipe thread connections (CN-5 and CN-6) are provided to allow easy connection of telem-
etry devices or other differential pressure measurement instruments. The connections are provided
plugged.
Figure 7: Instrumentation circuits highlighted
LI-2
Pl-1
V-10
V-8
CN-5
CN-6
V-9
LI-1