GA Drawings 2

[aggieengineerrmb]

What is the difference between a General Arrangement drawing and a General Assembly drawing for a component like a valve or a pump? I guess I have always used these terms interchangeably and called them both GA drawings, but I see that some vendors differentiate them.

 

[MintJulep]

I don't know that there is an official definition for this.

In my mind an assembly drawing identifies each component or sub-assembly and shows how they get put together. An arrangment drawing shows the overall layout of the equipment, and points you to other drawings where more detail can be found.

 

[quark]

MintJulep is right. General assembly drawing gives you an exploded view of the equipment(for general use during maintenance) where as a general arrangement drawing gives you the details of an assembled equipment ready to be installed(general use during installation).

PS: This is my understanding after going through so many drawings.

Regards,

 

[1969grad]

To me, general arrangement drawings show the overall outside dimensions of an assembly of items. For example, a skid-mounted assembly like a compressor unit or a pump and motor mounted on a baseplate.

On the other hand, general assembly drawings show the internals of the item like a compressor and includes the manufacturers part numbers.

The above relates to machinery but if you are putting a steel structure together then there may not be a difference.

 

[Luza]

I hope this may help...

- General Arrangement drawings are used mainly in Project / Process Engineering, to show, and locate equipment respect to the co-ordinate system within the plant or field, showing only those dimensions, datum, elevations to refer each equipment to other equipment or structures. Is common practice to indicate (in plan wiew) a short description (type, capacity, power,...). A valve is referred into the pipeline showing it basic specifications( diameter/type/standard), distance from pump, height from floor, and special connection specifications. This valve will be identified by a TAG number or code.


- General Assembly drawings, show the equipment referred to itself, and is used mainly for location, anchoring, connections, maintenance. In some complex equipment there may have several disciplines or sub-assemblies (electrical, control, pneumatic...)General Assembly drawings are more usual in Design Engineering, ad usually are provided from equipmet manufacturers. General Assembly drawings uses the PART NUMBER.

I work from 15 years in Conveying Design Project Engineering. When I start... I had many fights to define this and other topics.

¡ Best regards to all from Chile !