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General Arrangement (GA) Drawings

General Arrangement (GA) Drawings – Introduction

The design engineer must be able to effectively idealize the structure to acquire the closest theoretical and practical behavior of the structure under load to carry out a design properly. Typically, this interpretation is based on conventional and well-prepared architectural plans of the planned project. The architectural drawings allow the engineer to create what is commonly referred to as the building’s “General Arrangement” which is also referred to as GA drawing. A General Arrangement GA drawing is similar to a plan in that it shows all of the design features needed for construction. It is a document that clearly outlines the placement of structural elements in a building, such as columns, beams, floor slab panels, and many more, on which the structure’s design is based. Engineers can understand the model of a structure, the size and type of structural parts, and the relevant assumptions used in the design by looking at the GA of a building. The more complicated a structure, the more information you’ll identify on a General Arrangement GA drawing. Multiple General Arrangement GA drawings may be necessary for some circumstances for each step of the project. This is the most general method of drawing used by professional structural engineers to accurately explain a structure to other legal teams, public authorities, and design, pricing, and construction groups. Depending on the building’s complexity, this may likely require projections, such as plans, sections, and elevations, which may be distributed throughout multiple drawings. In plan drawings, for example, you are looking down from the top of a building or floor to the bottom. Elevation drawings are drawn from one of the building’s sides, much like a grid line. General arrangement drawings may include enhanced views of difficult sections or features, as well as other information that is useful throughout the approval process and during the installation phase. They are sometimes referred to as location drawings since they illustrate the placement of individual components and assemblies within the overall design, but this is not to be confused with location drawings that show the physical site of the structure. At each step of the creation of a building design, general arrangement drawings are likely to be made, demonstrating the overall relationship between the principal features and critical measurements. As the project proceeds, the level of detail will rise, and they may need to be reinforced with more complex drawings illustrating individual pieces and assemblies. On relative projects, they may be included on the general layout drawings, although separate drawings are usually necessary. General arrangement drawings may include references to extra material, such as specifications and detail drawings, but should not duplicate information given elsewhere because this can become misleading and cause confusion. Notation and symbols may also be included. They must adhere to industry standards so that their exact meaning is clear and precise. The size at which drawings are made should match the amount of detail necessary to convey the information. Different line widths can be utilised to improve clarity for specific parts. They can be hand-drawn to scale or created with related software. Just because this is part of the plan for effectively building and finishing the project, it is critical that a GA design be highly detailed and that nothing is open to error. 

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Procedure for General Arrangement (GA) Drawing

  • Create a summary drawing of the panel and its components, including estimated placements and maybe a list of components.
  • Set your drawing scales, then add a border and viewports.
  • Add a panel to the model. Add any more plates to the panel. After all of the plates have been exploded, you will be sent to the General Arrangement layout.
  • Install any devices and instruments, as well as accessories and terminal strips, on the plate(s).
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Types of General Arrangement (GA) Drawing

GA drawings provide an overall depiction of the bridge to be built at various stages of the project. These are the phases:
  •         Concept design
  •         Preliminary design
  •         Detailed design
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Reading of General Arrangement (GA) Drawing

A 2D drawing has two sorts of views: orthographic (plans and elevations) and pictorial (isometric). G/A drawings are dominated by orthographic views, whereas isometric views offer build context but often lack measurements. It is simple to read a G/A drawing. A variety of 2D, dimensioned orthographic images help consumers understand building specifics.
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Requirement of General Arrangement (GA) Drawing

When the following conditions are met, GA Drawings are created.
  • Process equipment assembly drawings (e.g. vessels, piping, valves, and instrumentation).
  • Multiple perspectives in a single design, including the complete model or a portion of it
  • Schematic sketches (foundation, floor, deck layout, and anchor bolt plans)
  • Erection elevation drawings
  • Model view information, including 3D views
A good GA design involves precise physical layout drawings as well as schematic drawings. This reduces problems and delays caused by unsolved physical layout issues uncovered during production or testing.

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