Steel Structure Fabrication And Erection.

1. DPSI OBRA-C
2x660 MW
Steel Structure
Fabrication and erection
• PRESENTATION By:
• Ravi Choudhary
Arch. Dept

2. • OBRA C Thermal Power
Plant
Steel Structure Fabrication
and Erection

3. Steel Structure Work Process
Workshop/Laydown Development.
Adequate skilled manpower
Mobilization.
Equipment, Tools and tackle
arrangement.
Fabrication of steel.
Blasting/Surface preparation.
Material Shifting to Site.
Erection of material .
EHS work permit/ Risk assessment and
control measures implementation.

4. Workshop/Laydown Development.

5. Adequate Skilled
Manpower Mobilization

6. Equipment, Tools and tackle
arrangement.
• Crane
• Hydra
• Trailer
• EOT crane
• Consumable
• CNC machine arrangement
• Welding and Cutting machine
• Other Tools

7. Fabrication of steel.

8. 1. Design Preparation:
• The first step in any structural steel
fabrication process is design
preparation. This is where the drawings
and specifications for the project are
created and agreed. Once the design is
complete, the draftsman can start
creating exact Bill of Material
(BOM) and Bill of operations (BOO) to
prepare the information needed for
purchase and production.

9. 2. Material
Acquisition:
• When draftsman finishes detailed
BOM then purchases will take it over
to acquire the required materials for
the project. This usually involves
ordering the steel from a supplier.
Steel can be in standard length or
already cut into length based on
order. The steel will then be
delivered to the fabrication site.

10. Material
sections
usually:-

11. 3. Steel Cutting
and Drilling:
• The next step is to
cut and drill the steel.
This is usually done
with a CNC machine.
The steel is first cut to
the correct length and
then drilled to create
the holes needed for
the project

12. 4. Bending and welding:
• Once the steel is cut and drilled, it is
time to bend and weld it. Various
bending processes such as section
bending, roll bending, plate bending,
and tube bending are performed to
create the desired shape. The steel is
then welded together using either
MMA welding or MAG welding. The
welding can be performed by hand or
with a machine. Welding must be
performed under strict quality
management conditions as per BS
EN ISO 3834, under the supervision
of a welding coordinator.

13. Metal Arc
welding-

14. Submerged
Arc Welding

15. Metal
Inert Gas
welding

16. Types of
welding
Joint
mainly
performed

17. Welding symbol:-

18. 5. Quality
Check:
• The quality check ensures that
the steel meets all the required
specifications. It includes visual
inspections, dimensional
inspections, and mechanical
tests. Non-destructive testing
(NBT) is also performed to
ensure that the welded parts are
free from hidden defects and
cracks.

19. Steel Fabrication Quality checking procedure:-
Receiving, identifying and tracing the raw materials through
color coding, hard stamping and printed heat numbers
The preparation of the material (cutting of steel elements,
edge preparation, holes drilling/punching)
The actual production and production process
Surface preparation and protection including wire rushing
and blasting (preparation) and painting and galvanizing
(protection)

20. Welding Defects

21. Dye Penetration test

22. 6. Finishing of
Material:-

24. Painting:-
Application of Primer – 2
Coat (40 Micron per coat)
Application of MIO- 1 Coat
(80-100 Micron per coat)
Application of PU- 2 Coat
(35-40 Micron per coat)

25. 7. Delivery, Assembly,
and Installation:
• In the final step, the steel is delivered to the site
and assembled as per the required design. The
assembly process usually involves bolting, riveting,
or welding the steel parts together. The fabricated
steel parts must be handled carefully to avoid any
damage. Installation can be performed by using
heavy-duty cranes.

26. Erection of Steel
structures process:-
• Sequence for Erection of Steel Structures/Erection
Plan.
• Management/Arrangement for erection.
• EHS requirements.
• Foundation Handover.
• Erection/Lifting of Steel structure.
• Alignment of steel structure.
• Inspection and quality Check.
• Erection handover.

27. Sequence for Erection of Steel
Structures/Erection Plan.

28. Management/Arrangement
for erection.
Lifting Equipment
Electrical
equipment
Nacessary Hand
tools

29. EHS requirements.
Method statements.
Risk Assessment.
Controls Measures.
Tools Box meeting to workers on daily basis.
Implementation of permit system on daily basis.
Equipment checklist.
Small meeting before erection.

30. Falling
Object
Protection

31. Fall
Protection
Threshold
Height

32. Vehicle
Movement
with flagman

33. EHS Bulletin to
awareness

34. Foundation
Handover

35. Erection/Lifting
of steel structure
• Cranes and MEWPs (Mobile
Elevating Work Platforms) are
predominantly used for the erection of
structural steelwork.
• Types of Cranes:- Mobile cranes,
Tower cranes.
• Rigging plan as per steel weight and
crane load chart specification.
• Alignment (Lining, levelling and
plumbing)
• Site Bolting/ Welding

36. Equipment
types for
erection:-

37. Alignment of Steel Structure Positioning of Column
and Girder

38. Plumbing:-

39. Quality
policy
Message

40. Erection handover.
• The final objective of the erection process is to handover.
• Handover will consist final inspection, Completion of punch point
including touch up paint.

41. Overview Of
Erection:-

42. Glimpses of
structure Building
From Obra C site

43. CW Pump House

44. FGD Area (Gypspum dewatering and Limestone crusher House)

45. NH3 Shelter

46. Pipe Rack

47. Thank You