1. FABRICATION OF BLOCKS OWNERS REQUIREMENT DESIGN CLASSIFICATION SOCIETY
PROCUREMENT
SURFACE PREPATION
CUTTING
FABRICATION
ERRECTION

2. OWNERS REQUIREMENT CONTRACT WORKING SPECIFICATION VESSELS PARTICULARS
MACHINERY AND EQUIPMENTS
PAINTING SPECIFICATION
CLASSIFICATION SOCIETY.

3. DRAWINGS DESIGN SECTION. BASIC DRAWING
CONSTRUCTIONAL DRAWING AS PER BLOCKS
CUTTING PLAN (NESTING)

4. CLASSIFICATION SOCIETY
BASIC DRAWING APPROVAL
CONSTRUCTION DRAWING APPROVAL
MATERIAL APPROVAL
WELDING PROCEDURE APPROVAL
WELDERS QUALIFICATION APPROVAL

5. PROCURREMENT OF MATERIAL(STEEL)
CLASSIFICATION SOCIETY
DIMENSION AS PER DRAWINGS & CUTTING PLAN
GRADE OF MATERIAL
AVAILABILITY.

6. STACKING OF MATERIALS

7. LOADING OF PLATE ON ROLLERS FOR SURFACE PREPARATION
THE PLATE HAS TO BE DRY AND FREE FROM GREASE OIL ETC.BEFORE BLASTING.

8. SURFACE PREPARATION BLASTING Abrasive used for blasting sand
Copper grit
Iron grit
CLEANING

9. SHOP PRIMER PAINTING
Shop primers are thin coatings which are applied to steel plates and profiles after blast cleaning to provide temporary corrosion protection during transport, storage and production.

10. PAINTING

11. PAINT DRYER

12. STACKING OF PLATES

13. CUTTING OF PLATES CUTTING PLAN Nesting of plates as per drawing.
NOTE:-Nesting is done taking in consideration the shrinkage area after welding.
Program is fed to the CNC cutting machine.
Plate placed on the cutting bed is as per the dimensions in the program fed.
Plate squareness is checked & cutting is proceeded according to the program.

14. PARTS CUT FROM PLATES
FLOORS
MARKING ON FLOORS

15. EDGE PREPARATON

16. BENDING OF PLATES

17. TEMPLATES

18. BLOCK FABRICATION (e.g. Double Bottom)
SUBASSEMBLY
Bottom panel
Tank top panel
Floors
Girders
Bulkhead
Margin brackets

19. SUBASSEMBLY
BOTTOM PANEL
TANK TOP PANEL

20. SUBASSEMBLY
FLOORS
GIRDERS
MARGIN BRACKETS
BULKHEAD

21. UNIT ASSEMBLY Fitting & welding Tank top panel shifting
Floor, girder, bulkhead and margin bracket fitting to the tank top panel and its welding.
Pipe line fitting and welding accept end connections
Bottom panel fitting.
Bilge plate fitting and welding.

22. Bilge plate fitting and welding

23. Welding
The block is toppled and welding of floors, girders, bulk head and margin brackets to the bottom panel is carried out ,this is done to change the position of welding from overhead to down hand. As down hand welding is faster then overhead and also consumable required is less.
Dry survey is carried out .

24. STACKING OF BLOCKS

25. FABRICATED BLOCKS
Aft block.
Bulbous bow

26. Erection of blocks

27. Joining of Mega Blocks

28. Test to check the soundness and water tightness of blocks
NDT
Ultra sonic testing
Radio graphic testing
Magnetic particle testing
Die penetrant testing/ Liquid penetrant testing.
WATER TIGHTNESS
Air pressure test
Hydrostatic test
Hose test.

29. Painting of blocks Surface preparation as per painting specification.
Cleaning of surface from water, grease, oil etc.
Blasting, buffing (power tooling).
Cleaning of grit after blasting and surface inspection.
Painting as per specification.

30. Launching Pre launching Activities Under water survey
Drain plug fitting
Over board valves to be closed.
Anode fitting to be checked.
Propeller to be locked.
Rudder to be locked.
Clearing the path of slipway etc.
Launching.

31. Final out fitting
Sea trials
Delivery.