SECTION P4 SEPARATION SYSTEMS

Transcription

1 SEPARATION SYSTEMS The H.P. Separation System begins with the H.P. Production Header (GAY-1000). This header directs flow to the H.P. Production Separator (MBD-1000). Gases from the H.P. Production Separator flow to the inlet of the Gas Scrubber (MBF-1600) downstream of the Gas Lift BPV. There is also a supply line to the I.P. Separator to supply gas if needed with the use of a PCV. The H.P. Production Separator separates liquids and gases in the incoming H.P. flow from platform wells. Liquids are dumped to the I.P. Production Separator (MBD-1100). The I.P. Separation System begins with the I.P. Production Header (GAY-5500). This header directs flow to the I.P. Production Separator (MBD-1100). Gases from the I.P. Production Separator flow to the inlet of the 3 rd Stage Suction Scrubber (MBF-3400). The I.P. Production Separator separates liquids and gases in the incoming I.P. flow from platform wells and incoming pipelines. Liquids are dumped to the L.P. Production Separator (MBD-1200). The L.P. Separation System begins with the L.P. Production Header (GAY-3000). This header directs flow to the L.P. Production Separator (MBD-1200). Additionally, this separator collects low pressure liquids dumped from many of the low pressure dumps through the process systems. Gases from this Separator flow to the 2 nd Stage Suction Scrubber of the Gas Compressor but can be directed to the 1 st Stage Suction Scrubber. Oil produced in this vessel is dumped to the desired Oil Treater (NBK-1400/1500). Water is dumped to the Skimmer Tanks (NBM-2200/2300). The Test Separation System begins with the Test Header (GAY- 2000).This header directs flow to the Test Separator (MBD-4501). The Test Separator is a 3-Phase separator that is designed to test the well stream of a single well. The operator must manually switch the well stream to the Test Header to direct the well stream to the Test Separator. Gas is discharged through a flow recorder to the H.P., I.P., or L.P. Production Headers. The oil and water dumps are directed through meters before being comingled and dumped to the L.P. Separator. Rev: 2 Date: 6/11/13 Page 1 of 7 HI 595 CF & D

2 A. PRE-STARTUP PROCEDURE NOTICE: Refer to Preliminary Considerations in SECTION 3, PART A before beginning any start-up procedures. 1. H.P. Production Header, GAY-1000, and H.P. Production Separator, MBD-1000 Gas discharge to IP Separator PC/PCV Water dump LC/LCV Oil dump LC/LCV 2. I.P. Production Header, GAY-5500, and I.P. Production Separator, MBD-1100 Gas discharge BDV Liquid dump LC/LCV Rev: 2 Date: 6/11/13 Page 2 of 7 HI 595 CF & D

3 3. L.P. Production Header, GAY-3000, and L.P. Production Separator, MBD-1200 Gas discharge PC/PCV s Oil dump LC/LCV Water dump LC/LCV 4. Test Header, GAY-2000, and Test Separator, MBD-4501 (if the Test System will receive flow) Gas discharge PC/PCV s Oil dump LC/LCV Water dump LC/LCV Rev: 2 Date: 6/11/13 Page 3 of 7 HI 595 CF & D

4 B. START-UP PROCEDURES 1. H.P. Production Header, GAY-1000, and H.P. Production Separator, MBD-1000 b. Reset the HP Production Separator on the Operator Interface 2. I.P. Production Header, GAY-5500, and I.P. Production Separator, MBD-1100 b. Reset the IP Production Separator on the Operator Interface Rev: 2 Date: 6/11/13 Page 4 of 7 HI 595 CF & D

5 3. L.P. Production Header, GAY-3000, and L.P. Production Separator, MBD-1200 b. Reset the LP Production Separator on the Operator Interface 4. Test Header, GAY-2000, and Test Separator, MBD-4501 (if the Test System will receive flow) b. Reset the Test Separator on the Operator Interface 5. Continue to monitor bypassed safety devices and reset as they come in service 6. Immediately begin using Normal Operating Procedures to continue monitoring system REFER TO: SECTION 5, PART D Rev: 2 Date: 6/11/13 Page 5 of 7 HI 595 CF & D

6 C. SHUT-DOWN PROCEDURES WARNING: If complete process shut-down is required in order to shutdown the desired separation system, REFER TO: SECTION 4 NOTICE: Refer to Preliminary Considerations in SECTION 4, PART A before beginning any shut-down procedures. 1. Shut-down and isolate minor components that discharge to the separation system, and are not capable of being diverted to another separation system a. Manually activate the liquid dump to lower the vessel liquid level. Use caution not to lower the level far enough to trip the LSL (if applicable) b. Use LO/TO procedure to shut-down and isolate liquid dump from discharging to separation system WARNING: The Separation System must be returned to service to accept discharge before high liquid level or additional shutdowns will be required. 2. Place the separation system safety devices that are likely to trip and cause a process shutdown in bypass and flag 3. If possible, divert flow from inputs to alternate systems WARNING: The capacity of any alternate system should be verified before adding any additional inflow. a. Open the manual valve to divert flow to alternate system b. Slowly close manual valve to isolate flow away from separation system to be shutdown c. Monitor system accepting diverted flow to ensure operation within safe parameters Will level or pressure control devices require adjustment? Will new operating ranges need to be established? Rev: 2 Date: 6/11/13 Page 6 of 7 HI 595 CF & D

7 4. If necessary, manually activate liquid dumps in separation system vessels before isolating all system input CAUTION: Pay special attention to the levels in the minor components that were isolated and/or shutdown, the liquids dumped from this separation systems before final shut-down may have an effect on the liquids sent to those vessels later. 5. Shut-down facility inputs that flow to the separation system and will not be diverted a. Platform Wells REFER TO: SECTION P1, PART C b. Incoming Pipelines REFER TO: SECTION P2, PART C 6. Isolate the separation system a. Close all inlet manual valves to separation system b. Close gas discharge manual valves from system components c. Close oil dump manual valves from system components d. Close water dump manual valves from system components 7. Flag shut-down components as Out of Service 8. Open the manual gas relief/vent valve to bleed components to the relief system 9. Open the manual liquid drain valve to drain remaining liquid 10. Verify components are bled to 0 psig 11. Continue to monitor the other in service systems for safe operating parameters 12. Continue to monitor liquid level in other minor isolated components so appropriate action can be taken as necessary NOTICE: If shut-down was performed as preparation for maintenance work, or if the cause of the shutdown requires corrective action/repair, continue with Lock Out/Tag Out (LO/TO) Procedures REFER TO: Fieldwood Safe Work Practices for LO/TO (Section D Chapter 5) (can be found on the Fieldwood SEMS Portal) Rev: 2 Date: 6/11/13 Page 7 of 7 HI 595 CF & D