API 650, API 620 Storage tank, bottom, annular plate replacing, using jacking method.

Introduction

This tutorial guides you through the process of replacing the bottom annular plate of API 650 and API 620 storage tanks using the jacking method. This method is essential for maintaining the integrity and safety of storage tanks, ensuring they meet industry standards.

Step 1: Preparing for the Replacement

• Assess the Tank Condition: Inspect the tank for any signs of wear or damage. Ensure that the bottom annular plate is indeed the component needing replacement.
• Gather Tools and Materials:
  • Jacking equipment (hydraulic jacks)
  • Replacement annular plate
  • Welding tools and safety gear
  • Measuring instruments for precise dimensions
• Safety Protocols: Ensure all personnel are equipped with personal protective equipment (PPE) such as helmets, gloves, and safety glasses.

Step 2: Implementing the Jacking Method

• Position the Jacks:
  • Strategically place hydraulic jacks around the tank based on load distribution.
  • Ensure jacks are on stable ground to prevent shifting during lifting.
• Begin Lifting:
  • Incrementally lift the tank using the jacks, monitoring the process closely.
  • Lift the tank in small increments to maintain stability and control.

Step 3: Removing the Old Annular Plate

• Detach the Existing Plate:
  • Carefully cut or unbolt the old annular plate from the tank bottom.
  • Remove any sealant or welds that hold the plate in place.
• Inspect the Area: After removal, check the underlying surface for any damage or corrosion that might require attention before installation of the new plate.

Step 4: Installing the New Annular Plate

• Position the New Plate:
  • Align the replacement annular plate with the tank’s bottom.
  • Ensure it fits snugly and matches the specifications required by API 650 and API 620 standards.
• Secure the Plate:
  • Weld or bolt the new annular plate into place, ensuring a tight seal.
  • Use proper welding techniques to avoid defects in the weld.

Step 5: Lowering the Tank

• Gradually Lower the Tank:
  • Carefully release the pressure from the jacks, lowering the tank back to its original position.
  • Monitor the process to ensure no sudden shifts occur.

Step 6: Final Inspection and Testing

• Conduct a Thorough Inspection:
  • Check for any leaks or misalignments once the tank is in place.
  • Ensure all fasteners are secure and that the welds are intact.
• Test the Tank: Before putting the tank back into service, conduct a pressure test to ensure the replacement was successful and that the tank is safe for operation.

Conclusion

Replacing the bottom annular plate of API 650 and API 620 storage tanks using the jacking method is a critical maintenance procedure that ensures safety and compliance. By following these steps, you can effectively carry out this task while minimizing risks. Always prioritize safety and adhere to industry standards throughout the process. Consider scheduling regular inspections to maintain the integrity of your tanks over time.