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START-UP / SHUTDOWN PROCEDURES
Pre-start Procedure: Before starting the gas conditioning system, several things must be done.
First, ensure that the electrical breaker feeding the gas conditioning system control panel is on,
and then turn on the disconnect switch for the gas conditioning system and the glycol chiller.
The HMI screens on the gas conditioning system and glycol chiller should turn on. Ensure that
all valves are in their proper position. (Refer to the System Manual Valve Listing in Section 1)
IV
Start-up Procedure: On the as conditioning system control panel door,g g Y p , pull out the MASTER
STOP mushroom button (do the same to the remote MASTER STOP located on the gas
conditioning skid). Press the Control icon on the bottom of the NMI to go to the Control page.
Here, observe that the System Status is Standby. If it is not, press the Reset icon to clear any
present alarms.
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Section 3 Start-up/Shutdown Procedures Page 1
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SYSTEM STATUS
DAS BLOWER CHILLER
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CURRENT ALARM STATUS:
CODE DESCRIPTION COMPONENT 77ME DATE
The system can be started by pressing the Auto Start icon on the System Control page of
the HMI or the AUTO START button on the gas conditioning system control panel door. The
start sequence, described below, is exactly the same for both start commands. Once the �
command has been initiated the System Status indicator should display Run Chilling, and the
RUN light on the gas conditioning system control panel door will illuminate to indicate that the
system is running. There is also a run status contact available in the control panel, which can be
used to monitor the system run status remotely.
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As soon as the start command is given, the lead glycol chiller will begin to run. The
glycol chiller will continue to chill the glycol and stabilize at approximately 41'F. After the glycol
has reached the desired temperature the selected gas blower will start. As the blower runs,
pressure will begin to build at the discharge of the skid. The modulating valve BFV-958 [Unison
VM 351] will recycle gas, as necessary, in order to maintain a user entered operating pressure °
Section 3 Start-up/Shutdown Procedures Page 2
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of 3.0 to 5.0 psi based on the delivery pressure transmitter PIT-966 [Unison PIT 351]. The
blowers are controlled by VFDs which will ramp up and down from 25 to 65 Hertz to maintain
operating pressure as well. After the discharge pressure reaches the desired operating
pressure, minus a small offset, an end use run permissive will be issued to allow the end use
device to start.
While the system is in the run state, the control program cycles through the control loop
and monitors for alarms. It is important to be aware that components can energize and move
at any time. Always be alert when in the vicinity of the gas conditioning system. V
Shutdown Procedure: The system can be stopped by pressing the AUTO STOP button on the
gas conditioning system control panel door, or by touching the Stop icon on the Control page of
the HMI. The system also monitors many parameters on its own. If a parameter exceeds the
safe range, the system will issue its own stop command. All stop commands work exactly the
same. The system enters a shutdown sequence which takes several seconds to complete. The
system cannot be restarted until the stop sequence has timed out, as shown by the System �K
Status indicator on the HMI.
Emergency Stop Procedure: Should an emergency situation arise, press the local MASTER STOP
button on the gas conditioning system control panel door, or the remote MASTER STOP button
on the gas conditioning skid. Pressing either of these buttons will immediately remove power
from all PLC outputs. The power feed to the gas conditioning system control panel remains ;
energized. The only way to immediately cut power to the gas conditioning system control
panel is via the panel disconnect switch or by the breaker feeding from the site switchgear.
Section 3 Start-up/Shutdown Procedures Page 3
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Section 3 Start-up/Shutdown Procedures Page 4