1. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 1 of 12
Rev. B 10/23/15
1. PURPOSE:
These instructions describe the steps to safely operate dehydrator 3 at the Cunningham
Compressor Station.
2. RESPONSIBILITYFOR ADMINISTRATION:
Involved field operations employees are responsible for redlining and resolving any issues
encountered with the instructions.
 Responsible Operations Manager – Implement these operating instructions.
 Responsible Team Leader – Train and follow the aspects of these operating instructions.
 Responsible Field Operations Employees – Follow all policies, procedures, and
instructions.
 If not comfortable with any aspect of these instructions, please consult the Cunningham
team or the local management.
3. PRECAUTIONS AND LIMITATIONS:
3.1 Potential safety hazards include:
 Body strains and sprains
 Electrical
 Escaping gas
 Lock and Tag
 Nature’s hazards (wild animals, insects, terrain, weather, etc.)
 Noise
 Pinch points
 Slips, trips, and falls
3.2 Potential environmental risks include:
 Oil Leaks/Spills
 Glycol Leaks/Spills
 Gas loss for a possible emergency shutdown. (These must be reported for gas
accounting and notice should be provided to the designated division environmental
specialist).
WARNING: Always be alert! Conditions change, equipment modifications occur,
and new hazards may exist.

2. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 2 of 12
Rev. B 10/23/15
4. REQUIREMENTS:
4.1 Personnel that perform these operating instructions must have the following Veriforce
Common Covered Tasks (CCT):
 007 Operate Valves
 602 Monitoring Pipeline Pressure
 603 Compressor Units/Stations: Start-up, Operation, Shutdown and Purging Before
Returning to Service
4.2 To operate the Unit from the Human Machine Interface (HMI) screen, an active
Controls Network user name and password is needed.
4.3 You must use proper personal protective equipment (PPE) at all times. The following
tools and equipment are required:
 Ear plugs
 First aid kit
 Fire extinguisher
 Fire-retardant clothing
 Gloves
 Hardhat
 Safety glasses
 Steel-toed shoes
5. REFERENCES:
5.1 OP 030.201 Compressor and Plant Operating Instructions
5.2 OP 030.402 Emergency Shutdown System Training, Operating, Testing
5.3 OP 080.413 Abnormal Operation
5.4 OP 110.250 Equipment Isolation and Disassembly
5.5 OP 110.280 Fire Protection (Portable and Fixed)
5.6 OP 110.330 Hearing Conservation
5.7 OP 110.356 Job Safety Environmental Analysis
5.8 OP 110.380 Lock and Tag Safeguards
5.9 OP 110.450 Personal Protective Equipment
5.10 OP 160.103 Valve Security

3. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 3 of 12
Rev. B 10/23/15
6. INSTRUCTIONS:
6.1 INSPECTION OF THE FACILITY:
6.1.1 VERIFY that there are no active alarms from shut downs, fire detectors or gas
detectors.
6.2 DEHYDRATOR GLYCOL FILLING PROCEDURE:
6.2.1 Glycol can be added to each Dehydrator on a Unit-by Unit basis when there is
an inadequate level in the system.
6.2.2 If a low level exists in both the Iso-Thermal Reboiler and the Contractor Tower,
the operator can request a Glycol Fill to attempt to alleviate this issue.
6.2.3 SELECT the Dehy Shared Services Parameters page in HMI. See Figure 1:
Cunningham Dehy Shared Services Parameters Page.
6.2.4 VERIFY the fill amount to be added in the Glycol Fill Volume (per batch) box
(Example 100 gallons). See Figure 1: Cunningham Dehy Shared Services
Parameters Page.
6.2.5 VERIFY Glycol Fill Valve 0551 on Dehy 3 OPENS (GREEN in color) after the
Glycol fill button is selected on Dehy 3 Main Page, see Figure 2: Dehy 3 Main
Page.
6.2.6 VERIFY on the Dehy Shared Services Page Valve 1652 OPENS
6.2.7 MONITORthe amount being added in the GAL Box below the Lean Glycol
Storage Tank symbol and the Totals box in the upper left hand corner of the
screen in the Dehy 1 row on the Dehy Shared Services Page.
NOTE: These instructions are supplemented with a Job Safety and Environmental
Analysis (JSEA). Use the circle/slash process with the numbered bullets in
this section.
NOTE: If there are active alarms RESOLVE the issue.
NOTE: WALK around the Unit to observe the lock and tag process is complete.
NOTIFY anyone who might be on site of the start process.
NOTE: A 15 minute delay is required between fills of any type.

4. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 4 of 12
Rev. B 10/23/15
Figure 1: Cunningham Dehy Shared Services Parameters Page
Figure 2: Dehy 3 Main Page

5. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 5 of 12
Rev. B 10/23/15
6.3 ADDING GLYCOL TO THE CONTACTOR WHEN THE UNIT IS NOT ONLINE:
6.3.1 SELECT LOCAL MANUAL MODE in HMI to add glycol to the Contactor.
Glycol can only be added to the Contactor in Local Manual mode.
6.3.2 MANUALLY turn ON a pump and CLOSE the 9000 Valve in order to force
glycol to the Contactor.
6.3.3 MONITOR until satisfactory levels of glycol have been reached in the Contactor
and Dehy Skid.
6.3.3.1 When appropriate levels have been reached, the following steps
should be taken to warm up the Dehy and bring online.
6.4 BRING UNIT 3 TO A WARM UP STATUS:
6.4.1 CLEAR all inactive alarms by PRESSING the Reset Button.
6.4.2 CLICK the Warm Up Button (upper right hand corner) and a popup will display
to confirm your selection, see Figure 3: Warm Up Button.
6.4.2.1 CLICK Confirm. The Ignition sequence will initialize and a 110
second timer will begin to countdown the ignition process.
Figure 3: Warm Up Button
6.4.3 Once the temperature setpoint of 250 degrees has been reached the operator
will be prompted by a dialog box to OPEN the heat exchanger bypass valve
and the Unit will now be in WARMUP Mode. CLICK on Acknowledge, See
Figure 4: Warm Up Sequence Acknowledge.

6. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 6 of 12
Rev. B 10/23/15
Figure 4: Warm Up Sequence Acknowledge
6.4.1 When Warm Up is completed, the Idle Button is now available, see Figure 5:
Idle Available.
Figure 5: Idle Available
6.5 BRING UNIT 3 TO IDLE STATUS:
6.5.1 CLICK IDLE on the HMI screen (upper right hand corner) to place Unit in IDLE
mode, see Figure 5: Idle Available.
6.5.2 Operator will be prompted with a popup, see Figure 6: Idle Mode Prompt.
CLICK on the Confirm button to place in IDLE mode.

7. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 7 of 12
Rev. B 10/23/15
Figure 6: Idle Mode Prompt.
6.5.3 A dialog box will display on the screen to PROMPT the user to select the
Reboiler temperature, see Figure 7: Setpoint Temperature. Also note that the
Unit Status is now Going Idle.
Figure 7: Setpoint Temperature
6.5.4 SET the Reboiler Temperature by typing in the appropriate temperature in the
dialog box, see Figure 5: Set Point Temperature.
 Ranges vary from 350 to 385 degrees F.
 When ON LINE the temperature should be up around 385 degrees F.
6.5.5 CLICK OK button to ENTER temperature value.

8. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 8 of 12
Rev. B 10/23/15
6.5.6 A dialog box will display on the screen to PROMPT the user to CLOSE the heat
exchanger Bypass Valve, see Figure 8: Heat Exchanger Bypass Valve Prompt.
Figure 8: Heat Exchanger Bypass Valve Prompt
6.5.7 CLICK Acknowledge to CLOSE the Heat Exchanger Bypass Valve, see Figure
6: Heat Exchanger Bypass Valve Prompt.
6.5.8 The Dehy now has a Set Point of 70 % in the Tower V-1130, see circled area in
Figure 9: Glycol Stabilization.
Figure 9: Glycol Stabilization
6.5.9 Glycol Stabilization Button is now available to TOGGLE, see Figure 10: Glycol
Stabilization Button.

9. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 9 of 12
Rev. B 10/23/15
Figure 10: Glycol Stabilization Button
6.5.10 Depending on your current level in the Contactor and the Skid (Figure 7: Glycol
Stabilization) the contactor level Set Point may need to be adjusted to close to
or right at the current % level in the tower. If this is required then PERFORM
the following:
6.5.10.1 CLICK the Glycol Stabilization Override button, see Figure 10: Glycol
Stabilization Button.
6.5.10.2 The Override Dehy #3 popup will be displayed, see Figure 11:
Override Dehy #3 Glycol Stabilization Popup. CLICK on CONFIRM
and now you will be able to change the Tower Level Set Point.
Figure 11: Override Dehy #3 Glycol Stabilization Popup
6.5.10.3 In the Set Point popup set the appropriate level which should be close
to the % Level.

10. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 10 of 12
Rev. B 10/23/15
6.5.11 The Dehy is now in IDLE mode and ready to come online once the plant is in
the desired withdraw state. See Figure 12: Unit State Idle.
Figure 12: Unit State Idle
6.5.11.1 The states are either Free Flow or Horsepower, Figure 12 shows Unit
3 in Free Flow mode.
6.6 Contactor and Dehy maybe brought ONLINE by TOGGLING the Online Button (upper
right hand corner on the HMI screen), see Figure 12: Unit State Idle.
6.7 MONITOR that the program steps through the valve sequencing as the Dehydrator
and Contactor comes ON LINE.
6.7.1 As Gas begins to flow through the contactor much of the glycol will become
suspended and the level in the tower will drop.
6.7.2 The dehydrator will continue to say “GOING ON LINE” until the Unit reaches its
desired glycol level equilibrium in the contactor and the Reboiler, see Figure
13: OnLine.
Figure 13: Going OnLine
6.8 Once the Unit is close to the desired running level in the contactor the operator
SELECTS the Glycol Stabilization Override Button to stop this process and bring the
Unit to ON LINE status.
NOTE: This will prevent dumping all the glycol from the Dehy skid to the tower as
the program tries to satisfy the desired 70% level in the tower.

11. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 11 of 12
Rev. B 10/23/15
6.8.1 If in Free Flow mode, use your suction controllers to regulate the amount of gas
going through the contactor when first bringing On Line.
6.8.2 If in Horsepower mode use the Ladenn Valve 5803 downstream of the
Contactor while paying close attention to the spread on the compressors.
6.9 While ONLINE mode, MONITOR the glycol levels in the contactor and on the Dehy
Skid to keep a good balance.
6.10 MONITOR the condensate levels, pump flow, differential pressures on filters, Reboiler
temperature, etc.
6.11 CHECK Dehy and Contactor for fluid leaks or blowing gas. RESOLVE any issues that
you may find.

12. Cunningham Compressor Station OI 0xx1
Dehydrator Number 3 Operation Page 12 of 12
Rev. B 10/23/15
7. RECORDS:
7.1 None
8. CHANGE MANAGEMENT:
8.1 Responsibility for Procedure
Address all questions on this procedure to the Operations Manager. The Operation
Manager will be responsible for engaging the appropriate subject matter experts
(SMEs) in developing proposed revisions. The Regional Director must approve the
revisions prior to publishing.
8.2 Revision History
Revision history to include revision number, date, details of changes, and initials of the
Operations Manager/Regional Manager signifying revision approval.
Rev. A 10/23/15 – Field submission of the instructions.
Rev. B 05/29/15 – Technical written draft of the instructions.
Rev. C XX/XX/15 – Accuracy draft of the instructions.
Rev. D XX/XX/15 – Verification draft of the instructions.
Rev. E XX/XX/15 – Final Draft.
9. SIGN-OFF AND REVIEW:
9.1 Not required for this procedure.
10. ATTACHMENTS:
10.1 None