large structure with many common details

[TWJR]

Hello,

I'm doing a preliminary drawing check for a fairly large structure, which is something we do little of here. Without going into what the draftsman did that I'm marking up, what would be the best way to show detail views that appear in many different places on the structure? Often times one can say "detail A, 4 places" and it's clear, since the detail clearly is unique from other detail views of the drawing. In this case, at the scale of the main view(s), the details are tiny, and look much the same. Specifying counts (such as 4 places or 4X) would not really clarify every place the detail view applies. Should one pull out detail views of areas of the main view, then pull out smaller details within that? Sorry... I'm having a hard time explaining this. Hope I'm being clear enough.

 

[KENAT]

What's wrong with "detail A, 4 places" and then at each place have a note referencing detail A?

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[3DDave]

I agree with Kenat - Also, if it helps, put a circle around the area, sort of like a microscope or telescope viewer.

Another option, is to place a bold (dark) letter next to each item and under the detail view say "Marked A" or whatever letter appeals to you, along with the count. This is a little more concise, but less easy to find on the drawing, hence the second position for suggestion.

 

[Tunalover]

I question the wisdom of detailing out every component of the structure. Most fabricators I've dealt with would prefer end-item documentation (a drawing of the complete structure). They don't need all the detail. Is this a weldment?


Tunalover

 

[TWJR]

I like hearing the ideas... I was kinda thinking along that line, but hadn't seen a drawing which both circled one instance of a detail, and then pointed to others of the same kind. I guess there's nothing in ASME that prevents that. Tuna, this drawing is not of a weldment, per se. It does depict a large steel structure (crane supports for a LCS ship mission bay trainer), but it's not the structure itself we're trying to define. It's a layout of sorts to convey the locations of mounting points for drive motors and other items for use to the vendor who will ultimately fabricate the structure. On this drawing, the structure itself is basically "reference", while the locations and hole patterns (the details) are what the drawing is to specify.

 

[JNieman]

For large structures with similar features/connections, I always created a "typical details sheet/s" and referenced the type on the column or anchor bolt layout. There would be a plan/profile of each connection as needed, and the symbol applied where applicable.

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[Tunalover]

For repeated occurrences of the same detail you can do something like: in the caption under the detail view, put, say, 12X INDICATED G. Everywhere the detail occurs on the structure run a leader to one of the holes and put the letter G and/or put the letter G on the drawing centered within each hole group. Of course it's required that none of the occurrences be rotated from what appears on the detail.


Tunalover

 

[TWJR]

Thanks all. Good suggestions.