Emerson Bettis PressureGuard, Руководство по установке и обслуживанию

Страница: 10 / 30

March 2014
Installation and Maintenance Manual
E-90090005 Rev. A
7
Section 4: Operation
Operation
4�2 Automatic Mode
The primary mode for BETTIS™ PressureGuard™ is its Automatic Mode. This is the mode
in which the system is to be set in the field when technicians are not actively inspecting or
maintaining wellhead components or resetting the system.
1. BETTIS™ PressureGuard™ enters and stays in Automatic Mode after step #4 in
the preceding section is completed as long as signal device(s)
(for example, Pressure Pilot (14)) are satisfied and Solenoid Valve(s) (20) (if any)
are returned to normal operating condition.
2. In Automatic Mode, the Reset Valve (23) toggle will extend past its latched position
from Manual Mode and will hang loosely (pane #2 of Figure 2.
(Three Modes of Reset Valve)).
4�3 Shutdown Mode
There are several ways in which BETTIS™ PressureGuard™ can move the valve and enter
in shutdown mode.
1� Manual Shutdown
Technician can manually close the valve by pushing down the toggle on the
Reset Valve (23) or switching the Selector Valve to “
Manual ”. Manually initiated
shutdown mode will usually be used for servicing the pipeline of BETTIS™
PressureGuard™ system.
2� Signal Devices
a. If the Pressure Pilot (14) senses that the pipeline pressure is outside the
customer’s defined setpoints, it will release holding pressure from the
operator, letting the operator’s spring move the valve to its shutdown
position.
b. If the Solenoid Valve(s) (20) receives an electrical signal, it will also release
holding pressure from the operator, letting the operator’s spring move
the valve to its shutdown position.
Shutdown initiated by the signal device(s) will likely be an ESD event.
The Reset Valve (23) toggle will be unlatched and flattened against the
valve body (pane #3 of Figure 2.
(Three Modes of Reset Valve)) regardless
of how shutdown occurs. Returning the valve to its operational position
can only be accomplished manually and will require a technician to go to
the valve and reset BETTIS™ PressureGuard™.