The top lift spreader method, the top lift sling method, the bottom lift sling method and the forklift method.
STEP-1
- Annular plates and bottom plates are laid out and welded.
- Spacer beams (400 to 500 mm in height) are placed on the annular plate at a spacing of 2000 mm around the periphery of the tank. Spacer beams have guide cleats welded onto them.
- The top-most shell course (or top two shell courses) is erected on the spacer beams, and fixed roof construction is completed, leaving 3 or 4 plates open in the roof for air to vent through the roof.
- Jacking equipment is installed inside the tank.
STEP-2
- The constructed part of the tank is lifted up to the height required for the next shell course to be placed on a spacer beams.
STEP-3
- Plates of the next shell course are erected on spacer beams, and vertical welds are The lifted part of the tank is lowered down slightly to sit on the newly erected shell course, after which horizontal welding on the external face is completed using an Astha automatic girth welding machine.
STEP-4
- Once horizontal welds are completed, the tank weight can be released from the jacks. Lifting and fending off lugs are cut off
- The control valve is opened to direct oil flow from the power pack to the retraction mechanism and shut off oil flow to the lifting jacks
- With the press of a lever, all jacks retract away from the tank shell, creating space between the inside face of the tank shell and the jack trestles to allow the use of Astha SAW single-side AGW for internal
- Astha SAW Single Side AGW is mounted on the inside periphery of the tank, and internal welds are completed.
STEP-5
- After internal welds are completed, the AGW is dismounted, and the trestles are brought back hydraulically all at once to their original vertical position, ready to lift the next shell course.
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