1. PT. PRATIWI PUTRI SULUNG Co-Gen Duri PRESENTATION TO Chevron

2. Introduction Located in Texas, U.S.A. Michael W. Kort M.E.Eng., his expertise is the Oil/Gas Facilities pipeline equipment and is stationed in Indonesia. North Star Intl. doing business with Q. B. Johnson Manufacturing Inc. Oklahoma, U.S.A. North Star Intl. doing business with Luxor Manufacturing Inc. Texas, U.S.A. North Star Intl. doing business with Alabaster Corp. Bioremediation, Texas, U.S.A. North Star Intl. doing business with PT. Pratiwi Putri Sulung, Jakarta, Indonesia. PT. Pratiwi Putri Sulung, their expertise manufacturing and construction of Metering Stations.

3. Air-Operated Valve (AOV-1) Facility Improvement at NDC Fuel Gas Plant Chevron NDC letdown station

4. Chevron

10. Background 1. Current Condition : Inadequate redundancy for system control of Emergency Shutdown Valve. Had been in service / operation for 7 (seven) years since NDC Plant commissioning in 2000 and never been serviced. Single piping (no bypass for Emergency Shutdown Valve) without any facility for maintenance. No Predictive/ Preventive maintenance can be applied. No double block & bleed valves. Pressure Safety Valves (PSVs) are directly release to atmosphere at the fuel gas plant with inadequate requirement based on PSV Audit Chevron standard. 2. What are we going to do? : We are going to provide alternative line facility of gas supply with no operation interruption (on line condition). Thereby increasing plant reliability. Chevron

11. Background (cont.) 3. How will we do it? :  By installing the by pass line for Emergency shutdown valve.  By installing the alternative system control for redundancy.  By installing the double block & bleed valves.  By performing the PSV audit and modify relief system as necessary. 4. Why is this important? :  This AOV-1 valve is the weakest point where it can fail anytime and shutdown the entire plant. 5. How it will contribute to GPO business objectives?  It becomes very critical for both NDC Plant Safety & Commercial Operation. In case of failure, NDC will loss of electricity & steam production and may impact on loss of generation at the grid & steam supply to CPI operation. Chevron

12. LEDEEN PNEUMATIC AOV 10” GROVE VALVE B5 16” GROVE VALVE B5 BLEED VALVE

13. Business Driver – To avoid potential revenue loss of US$ 224,000.00/ daydue to loss of fuel gas supply (from MCTN side) – To avoid potential revenue loss of US$ 224,000.00/ day due to loss of fuel gas supply (from MCTN side) – To avoid potential revenue loss of approximately US$ 9MM/ day (from CPI production) – To improve safety and reliability of NDC plant operation Chevron

14. Boundary Conditions 1. In Scope: Area of scope for fuel gas supply facility at NDC letdown station & HCT pigging facility at North Duri Design, construct, and commission of new modification of incoming fuel gas Hydro-test, NDT, and X-ray are required and documented New operation and maintenance procedures Total appropriated budget (materials & man powers) Instrumentation system Civil work (pipe support) Venting line modification Double block & bleed arrangement Chevron

15. Uncertainties Identified Technical Uncertainties –The qualified contractor to execute the installation. –New bypass line design may require a big area including underground line thru the road crossing. –Budget value approved by management is less than estimated –Material availability and delivery of the Air Operated Valve (AOV) Chevron

17. MR 1 M2B M2A

18. Preliminary Overall Plan Preliminary Assessment –The AOV-1 is located downstream of the CPI HCT interface to isolate the system from the supply line. –This valve is remotely manually controlled through the DCS to open or close the fuel gas supply line. The DCS monitors the pressure downstream of the regulating station by pressure transmitter, and under normal operating conditions, adjust the two 8 inch control valves (PCV-23A & PCV-23B) to maintain the operating pressure. During start-up of the first CT, the smaller 3 inch regulating valve is used to maintain system pressure. –This valve is manually gear operator and it has been provided to operate the valve if the instrument air system is non operational or the actuator has malfunctioned. –Downstream of AOV-1 valve is a pressure reducing / regulating station, which is designed to maintain the fuel gas system pressure at 425 psig and protected from over pressure in event of a control valve failure by two 10 inch pressure relief valves (PSV-26 & PSV-27). Chevron

19. Preliminary Overall Plan (cont’d) Design Alternatives 1. Fully shutdown (Alternative 1) 2. Hot-tap tie-in at NDC facility (Alternative 2) 3. Partially shutdown with temporary plug at NDC facility (no hot-tap) - (Alternative 3) Chevron

20. Strategic Table Strategic Theme Partially shutdown with NO temporary plug at NDC facility (no hot-tap) (Alternative 3) Tie-in connection The bypass line from pig receiver point at HCT plant will feed-in 16" pipeline into the of gas led- down station. The bypass line will be fabricated outside and feed-in 14" branch line into the existing elbow of gas led-down station. Hot tap equipment will be required for this temporary plug. Small modification on the pig receiver is required. It will need partially shutdown of NDC gas letdown plant. Implementation The bypass line will be fabricated outside and feed-in 16" branch line into the existing of gas led- down station. Small modification on the pig receiver is required. It will need partially shutdown of NDC gas letdown plant.

21. EXISTING UNIT AOV 1 NO ISOLATION NO DOUBLE BLOCK Chevron

22. PIPE AND EQUIPMENT Prefabricated and Hydrotested and X-ray and Documented by; PT. Pratiwi Putri Sulung. Installation and construction by; PT. Pratiwi Putri Sulung, supervised by Michael W. Kort

23. PREFABRICATED PARTS FABRICATED BY PPS AND HYDRO-TESTED AND X-RAY AND REPORT (DOCUMENTED) PURPOSE FOR QUICK INSTALLATION 1 2 3 4 5 6 7

24. : 1. CLOSE Valve A and B A B Close Relieve Valve 2. Open Relieve Valve 3. Inspect for leaks at the Valves, by a Gas Detector 4.This will tell you, OK or NG 5. If Ok, remove obstacles Down Stream of the Valves 6. If NG, install a Stopple after you can remove obstacles Down Stream of the Valves VALVE INSPECTION Relieve Valve

25. PARTIALLY SHUTDOWN REMOVE CLOSED AOV 1 OPEN CLOSED

26. PARTIALLY SHUTDOWN INSTALL VALVE CLOSED 1 INSTALL PREFABRICATED SPOOL AOV 1 OPEN CLOSED INSTALL BLIND FLANGE DOUBLE BLOCK

27. PARTIALLY SHUTDOWN CLOSED AOV 1 OPEN REMOVE

28. AOV 1 OPEN CLOSED 2 INSTALL PREFABRICATED SPOOL INSTALL VALVE DOUBLE BLOCK PARTIALLY SHUTDOWN CLOSED OPEN

29. PARTIALLY SHUTDOWN REMOVE BLIND FLANGE CLOSED AOV 1 OPEN RE-INSTALL OPEN CLOSED

30. PARTIALLY SHUTDOWN 3 INSTALL PREFABRICATED CLOSED AOV 1 OPEN CLOSED OPEN CLOSED INSTALL VALVE

31. 4 INSTALL PREFABRICATED PARTIALLY SHUTDOWN CLOSED AOV 1 OPEN CLOSED OPEN

32. PARTIALLY SHUTDOWN CLOSED AOV 1 OPEN AOV 2 CLOSED OPEN CLOSED INSTALL VALVES DOUBLE BLOCK

33. AOV 1 AOV 2 OPEN CLOSED TRANSFER FLOW NORTH AREA IS FINISHED REMOVE INSTALL BIND FLANGE CLOSED OPEN CLOSED PARTIALLY SHUTDOWN

34. AOV 1 OPEN AOV 2 CLOSED 5 INSTALL PREFABRICATED SPOOL INSTALL VALVE CLOSED OPEN CLOSED DOUBLE BLOCK

35. REMOVE PARTIALLY SHUTDOWN AOV 1 AOV 2 OPEN CLOSED OPEN

36. PARTIALLY SHUTDOWN AOV 1 OPEN AOV 2 CLOSED 6 INSTALL PREFABRICATED SPOOL DOUBLE BLOCK CLOSED OPEN CLOSED INSTALL VALVE

37. PARTIALLY SHUTDOWN RE-INSTALL AOV 1 AOV 2 CLOSED OPEN CLOSED

38. 7 INSTALL PREFABRICATED AOV 1 AOV 2 OPEN CLOSED OPEN CLOSED PARTIALLY SHUTDOWN

39. AOV 1 AOV 2 OPEN CLOSED OPEN CLOSED OPEN IS IN FULL SERVICE

40. NO NC NO NC AOV 1 AOV 2

41. PREFABRICATED PIPELINE 16” PREFABRICATED PARTS FABRICATED BY PPS AND HYDRO-TESTED AND X-RAY AND REPORT (DOCUMENTED) 2 1 3 4 5 6

42. IS IN FULL SERVICE PIG RECEIVER NO NC MR 1 MR 2A MR 2B M12 24” 18” 16” 12” 18” 4” FLARE MR 3B MR 3A

43. IS IN FULL SERVICE NO NC MR 1 24” 18” MR 2A 1 INSTALL PREFABRICATED TEE NC MR 2B PIG RECEIVER MR 3B MR 3A

44. IS IN FULL SERVICE 24” 18” MR 1 NO MR 2A MR 2B NC INSTALL VALVE PIG RECEIVER MR 3B MR 3A

45. MR 1 MR 2A MR 2B NO NC 24” 18” 2 INSTALL PREFABRICATED SPOOL IS IN FULL SERVICE PIG RECEIVER MR 3B MR 3A

46. IS IN FULL SERVICE MR 1 NO MR 2A MR 2B NC 24” 18” INSTALL VALVE PIG RECEIVER MR 3B MR 3A

47. IS IN FULL SERVICE NO MR 1 MR 2A MR 2B NC 24” 18” 3 INSTALL PREFABRICATED SPOOL PIG RECEIVER MR 3B MR 3A

48. IS IN FULL SERVICE NC MR 1 NO PIG RECEIVER NC MR 2A MR 2B 4 INSTALL PREFABRICATED SPOOL 24” 18” MR 3B MR 3A

49. IS IN FULL SERVICE 5 INSTALL PREFABRICATED SPOOL MR 1 NO NC MR 2A MR 2B 24” 18” MR 3B MR 3A

50. IS IN FULL SERVICE MR 1NO NC 24” 16” 18” 16” 24” NC NO 6 INSTALL PREFABRICATED SPOOL MR 3A MR 3B MR2A MR2B AOV I AOV II

51. ALTERNATIVE 1, EXCISTING PIPELINE AOV 1 IN SERVICE NEW PIPELINE AOV 2 OUT OF SERVICE IS IN FULL SERVICE NEW PIPELINE INSTALLED NC NO

52. ALTERNATIVE 1, EXCISTING PIPELINE AOV 1 OUT OF SERVICE NEW PIPELINE AOV 2 IN SERVICE IS IN FULL SERVICE NEW PIPELINE INSTALLED NC NO NC

53. DRAWINGS

56. Thank you for your kind ATTENTION