SHOP FABRICATION PROCEDURE

*note: this is the sample document for the related job only

*author: theprocedure@engineer.com

TABLE OF CONTENTS

1.0 GENERAL
1.1 Scope
1.2 Drawing
1.3 Material
1.4 Welding
1.5 Inspection
1.6 Post Weld Heat Treatment
1.7 Painting

2.0 SHOP FABRICATION
2.1 Shell Plate
2.2 Roof Plate
2.3 Roof Structure
2.4 Top Angle and Stiffener
2.5 Manhole & Nozzle (Unit Fabrication)
2.6 Reinforcing Plate
2.7 Stairway, Ladder & Platform
2.8 Heater piping. (if any)
2.9 Other Accessories

3.0 Dimensional Tolerance
3.1 Shell Plate
3.2 Roof Plate
3.3 Roof Structure
3.4 Top Angle. Stiffener and top Birder
3.5 Nozzle and Manhole

1. GENERAL

1.1 Scope
This specification covers the requirement for shop fabrication of the EPCC of Two (2) nos additional crude Storage Tanks.

1.2 Drawing
All shop fabrication shall be carried out in accordance with WH fabrication drawings.

1.3 Material
All material shall comply with WH drawing and applicable CLIENT specification.

1.4 Welding
To submit all WPS and WQT for review and approved by 3rd Party Inspector (Dosh approved NDT)
All welding shall be carried out in accordance with approved Welding Procedure Specification. (Shop/Site)

1.5 Inspection
Inspection shall be carried out in accordance with Shop Inspection Procedure Specification.

1.6 Post Weld Heat Treatment
Post weld heat treatment shall not be required for this project.

1.7 Painting
Painting at shop shall be carried out in accordance with Painting specification.

2 SHOP FABRICATION

2.1 Shell Plate
Cutting and/or edge preparation shall be done with flame planer or automatic gas cutting and/or automatic beveling machine.
All damage such as pop-outs, deep burn serrations shall be repaired by grinding.
After edge preparation, shell plates shall be cold rolled to the curvature in accordance with fabrication drawings.
The weld edges shall free from oil, dust, scale, water and other foreign materials, then shall be coated with weld able paint.

2.2 Roof Plate
Roof plate shall be marked off in accordance with fabrication drawing and the edge shall be cut with automatic gas cutting for shop fabrication.

2.3 Roof Structure
Rafter, girder and column shall be prefabricated to be ready for erection.

2.4 Top Angle and Stiffener
Top angle and stiffener shall be rolled to suit the curvature of the tank with bending roll machine, then both ends shall be cut and edge prepared.

2.5 Manhole & Nozzle (Unit Fabrication)
Neck plate of manhole shall be cut with automatic gas cutting machine according to the drawing and be cold rolled.
Seam joint shall be welded and then Flange shall be welded to manhole neck.
Nozzle pipe shall be beveled end with pipe cutter or gas cutting machine, and flange shall be welded to nozzle pipe.

2.6 Reinforcing Plate
Reinforcing plate shall be outer periphery cut, opened and beveled with automatic gas cutting machine after marking off then pressed or rolled to suit the tank curvature.

2.7 Stairway, Ladder & Platform
Handrails shall be shaped to the specified curvature with bender.
Treads and platform shall be fabricated to be ready for site erection.

2.8 Heater piping. (if any)
Cutting of pipes may be done either by mechanical or thermal (flame, arch or plasma) means.
For carbon steel, thermal cutting and beveling may be used only if the cut is reasonably smooth and all oxides are removed from the surface.

2.9 Other Accessories
Other accessories shall be fabricated completely in accordance with drawings.