Vessel Orientation on Drawing Sheet
Vessel Orientation on Drawing Sheet
(OP)
After 30+ years of detailing I now have to argue about fundamental drafting practices....
Somebody help!!!
In general the following is correct, I used to believe!
[1] On a plan view North is up the page
North is 0 deg
East is 90 deg
South is 180 deg
West is 270 deg
Just like a clock or compass-rose north is up and reading clockwise
[2] Vessels (and Structures) are built from the ground up,
Measuring tapes read left to right,
Therefore Vertical Vessels rotated horizontal on a drawing sheet have base at the left - top at the
right.....
(Regardless of CAD defualt settings!)
Any comments?
Comments
Somebody help!!!
In general the following is correct, I used to believe!
[1] On a plan view North is up the page
North is 0 deg
East is 90 deg
South is 180 deg
West is 270 deg
Just like a clock or compass-rose north is up and reading clockwise
[2] Vessels (and Structures) are built from the ground up,
Measuring tapes read left to right,
Therefore Vertical Vessels rotated horizontal on a drawing sheet have base at the left - top at the
right.....
(Regardless of CAD defualt settings!)
Any comments?
Comments





RE: Vessel Orientation on Drawing Sheet
UNLESS, there was a need to show a certain detail or view rotated to be more clear.
Chris
SolidWorks 07 3.0/PDMWorks 07
AutoCAD 06
ctopher's home (updated 04-21-07)
RE: Vessel Orientation on Drawing Sheet
I can see how this convention would be more appropriate to architectural or plant drawings.
RE: Vessel Orientation on Drawing Sheet
In aerospace, a part may be catty-wumpus in space, and trying to force the detail views to reflect the normal view projections of an aircraft is a wasted exercise in futility which gains nothing in the quality of the drawing.
Modeling parts, however, is a different issue subject to different arguments.
RE: Vessel Orientation on Drawing Sheet
Standards are good for the most part, but they do not and cannot cover all situations. If clarity and unambiguity of details require going against standards, then IMO the standard should be ignored. If need be, a simple note explaining the view/detail should more than suffice for non-compliance.
RE: Vessel Orientation on Drawing Sheet
RE: Vessel Orientation on Drawing Sheet
Look up Orthographic Projection. Then determine if your company/country/industry prefers to detail in First Angle or Third Angle Orthographic Projection.
As far as orientation of your primary view goes, it doesn't matter what the installed orientation will be (Like the Tick said, that is what assembly and installation drawings are for.), what matters is that the primary view is the best view for describing the part and that it is orientated so that the dimensions on the drawing can be understood.
David
RE: Vessel Orientation on Drawing Sheet
RE: Vessel Orientation on Drawing Sheet
RE: Vessel Orientation on Drawing Sheet
I showed the elevation rotated with the top to the left and bottom to the right, and showed all connections in the same plane, measured from the bottom or base
Then, I used sections at each different elevation to define the orientation of each fitting relative to 'north' or any customer-defined location.
Our fabricators and erectors all used these prints without any problems.
Good luck in your situation.
RE: Vessel Orientation on Drawing Sheet
Dan (all caps on drawings) Blackwell