PEMELIHARAAN STEAM TURBINE JOURNAL BEARING - NAZAR ADAM A. - PT.PJB UPHT

Key Concepts:

• Disassembly (Pembongkaran) and Assembly (Penghargaan) of bearings
• Elliptical Journal Bearing and Tilting Pad Bearing
• Clearance measurement (Pengukuran Clearance)
• Inspection (Inspeksi) for anomalies and cracks
• Torque (Torsi) specifications for bolt tightening
• Non-Destructive Testing (NDT) / Ultrasonic Testing
• Work Order (WO) management
• PT Officer coordination
• Safety procedures (K3)
• Lifting procedures (Standar Pengangkatan)

1. Preparation and Documentation:

• The process begins with preparing relevant documents, including work instructions (instruksi kerja), risk assessments (HIRADC), and Job Safety Analysis (JSA).
• These documents guide the disassembly and assembly process and outline safety protocols.
• Personal Protective Equipment (PPE) is essential: gloves, masks, and safety glasses are required.
• Tools and measuring instruments, including micrometers, wrenches, and lifting equipment, are prepared and checked for calibration.

2. Understanding Work Instructions:

• Before starting, the work instructions must be thoroughly understood. This includes the pre-assembly process, inspection criteria, and specified standards.
• Coordination with the team is crucial for optimal and effective work execution.

3. Disassembly Process:

• The disassembly process involves a team, ensuring each member understands their role.
• The first step is to remove the bearing cover (cover bearing) on the upper side (Sisi aper).
• The cover is lifted using a lifting crane and placed in a designated area.
• Clearance between the pedestal and the upper bearing is measured to ensure it meets standards.

4. Bearing Removal and Clearance Measurement:

• Bolts securing the upper and lower bearing halves are removed.
• The upper bearing is lifted approximately 30 cm, and a feeler gauge (let layer) of about 0.7 mm is inserted to check the clearance between the bearing and the rotor.
• The feeler gauge thickness is then measured using an outside micrometer, and the measurement is recorded.

5. Inspection Process:

• Inspection focuses on bolt tightening of the bearing cover, bearing itself, and pedestal bearing, adhering to specified torque values from the manual or standard bolt tension evaluations.
• Personnel health and readiness are verified before work begins.
• Journal bearings typically have a 60-degree arc with a clearance of approximately 0.5 to 0.65 mm.
• The equipment is inspected for initial cracks, which, if found, require Non-Destructive Testing (NDT) or ultrasonic testing by the reliability assessment team.
• All bearing components, including springs and shoes, are checked for anomalies.
• Lifting procedures must comply with standards such as Japanese or British standards.

6. Post-Inspection and Reassembly:

• After measurements and inspections, all tools and equipment are returned to their original positions.
• Turbine bolt tightening must adhere to specified torque values.
• The condition of the equipment before and after the work order is documented, including bearing clearance measurements.
• Any anomalies in equipment condition are photographed and documented as recommendations for future work orders.

7. Reporting and Work Order Management:

• A report is created and submitted to superiors or the owner, detailing the work performed.
• The work order is updated with the hours worked and the condition of the equipment.
• The PT Officer is notified that the equipment is ready for operation.
• The work order can then be closed, and the PT Officer coordinates with the operator to prepare the equipment for startup.

8. Key Arguments and Perspectives:

• The video emphasizes the importance of following documented procedures (work instructions) to ensure safety and quality.
• Team coordination and communication are highlighted as essential for efficient work execution.
• Regular inspection and maintenance are crucial for preventing equipment failure and ensuring optimal performance.

9. Notable Quotes:

• "Hai assalamualaikum warahmatullahi wabarakatuh Abdul Nasser Adam Sherly mekanik ppht dalam rangka untuk melakukan tes uji praktik secara online saya akan menggambarkan bagaimana caranya melakukan pekerjaan khususnya dalam pembongkaran dan penghargaan" - Introduces the purpose of the video.

10. Technical Terms and Concepts:

• HIRADC (Hazard Identification, Risk Assessment and Determining Control): A risk assessment methodology.
• JSA (Job Safety Analysis): A procedure to identify potential hazards in a specific job.
• Elliptical Journal Bearing: A type of bearing with an elliptical shape.
• Tilting Pad Bearing: A type of bearing with tilting pads to improve stability.
• Clearance: The gap between moving parts, crucial for proper lubrication and operation.
• Non-Destructive Testing (NDT): Testing methods that do not damage the component being tested.
• Ultrasonic Testing: A type of NDT that uses sound waves to detect internal flaws.
• Work Order (WO): A document authorizing maintenance or repair work.
• PT Officer: Personnel responsible for managing work orders and coordinating maintenance activities.

11. Logical Connections:

• The video progresses logically from preparation and documentation to disassembly, inspection, reassembly, and reporting.
• Each step builds upon the previous one, ensuring a systematic and thorough process.
• The emphasis on safety and adherence to standards is consistent throughout the video.

12. Synthesis/Conclusion:

The video provides a detailed overview of the disassembly and assembly process for bearings, emphasizing the importance of safety, documentation, team coordination, and adherence to standards. It highlights the critical steps involved in inspection, measurement, and reporting, ensuring that equipment is properly maintained and ready for operation. The process is designed to be systematic and thorough, minimizing the risk of errors and ensuring optimal equipment performance.