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General Arrangement (GA) Drawing

A General Arrangement (GA) Drawing for an API 650 storage tank provides a detailed layout of the tank's components and dimensions. Here are the key elements typically included:

Key Elements of a GA Drawing:

Overall Dimensions: The height, diameter, and length of the tank.
Shell Design: Details of the shell thickness, material specifications, and corrosion allowance.
Nozzles and Openings: Locations and dimensions of manholes, vents, and other openings.
Support Structures: Details of any support structures, such as wind girders or stiffening rings.
Access Platforms: Locations and dimensions of access ladders, platforms, and handrails.
Instrumentation: Positions and details of gauges, level indicators, and other instrumentation.
Welding Details: Specifications for welds, including locations and types of welds.
Material Specifications: Types of materials used for different parts of the tank.
Inspection and Maintenance Access: Details on how to access various parts of the tank for inspection and maintenance.
Design data table & nozzles data table

Basics GA Drawing:

Fix the layout for tank overall dimensions in elevation, top view and side view.

2. Compare the overall dimensions and reference dimensions

3. all the attachments and tank parts shell be in completely 1:1 scale

4. all the orientation for Man ways , draw of sump, Nozzles and internal and external ladder clips, earthing boss or Clips, wind girder, lightning clips, piping support clips and etc.

5. All nozzle sizes and standards, schedules, type of flanges to be used, type of faces to Be used in flanges, if required any blind flanges, Davit Man ways, hinged type man ways, Vent and all nozzle elevation should be Fixed in Bottom of tank (bottom of shell plate). These items should be come in nozzle Details.

6. General notes, assembly notes are added in notes.

7. Which type of materials used in tank and attachment parts is come in material of Construction.

8. Add the design notes in Design Data table

Total weight of the tank and centre of gravity .

10. If any internal (or) external surface preparation is there, this notes also added.

11. Client gives any standards to be follow the tank detailing, that standard also should Give the Standard requirements

12. If any tolerance given, that is also added in overall dimensions 13. Structural also added in the GA drawing.

14. If any legends there these items also include

Major dimensions specified in GA Drawing

1. Tank total height

2. Tank ID

3. Tank plate thickness in via course

4. If any wind girder is there that elevation should be added

5. Nozzle orientations and ladder positions (internal or external), ladder clips And piping supports, all attachments. etc

6. Nozzle elevations (X,Y) minimum two dimensions

7. If Roof Nozzle there, that case angel and distance for center line of tank

8. Structural column to column distances overall length for columns 9. Sump Orientation

Example small tank 38 m3 (10,000 gallons) with
lifting legs, anchorage, manhole, nozzles
Thickness as per calculations to be indicated

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General Arrangement (GA) Drawing

Key Elements of a GA Drawing:

Example small tank 38 m3 (10,000 gallons) with
lifting legs, anchorage, manhole, nozzles
Thickness as per calculations to be indicated

General Arrangement (GA) Drawing

Key Elements of a GA Drawing:

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Example small tank 38 m3 (10,000 gallons) with lifting legs, anchorage, manhole, nozzles Thickness as per calculations to be indicated

Example small tank 38 m3 (10,000 gallons) with
lifting legs, anchorage, manhole, nozzles
Thickness as per calculations to be indicated