Taylor-Wharton Microbulk Tanks - Manual (Page 15)

TW-407 Rev.-
13
Safety Devices
The MICRO BULK features safety valves to prevent over-pressurization of the vessel. The safety valves
(SV-1A and SV-1B) relieve pressure when it exceeds the maximum operating pressure of the vessel. The
valve resets when pressure drops below this point. In addition, the primary safety valve is supported
by a secondary relief device consisting of a rupture discs (R-1A and R-1B). The rupture disc requires re-
placement in the event a safety valve malfunctions and allows vessel pressure to reach the burst pres-
sure rating of the disc. A Dual Safety Divert valve (V-9) permits the operation of one set of protection
devices while the other set is isolated at the same time and permits maintenance of the device with
out the need to vent tank pressure. To activate one set of devices while isolating the other move the
selector valve handle all the way to the end of its travel toward the devices to be activated.
Figure 6: Safety circuit highlighted
R-1B
SV-1B
V-9
CN3
R-1A
SV-1A
V-12
V-13
Safety Devices