FFWs on Isometrics

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9 years 1 day ago #8921 by Garzabla1
Replied by Garzabla1 on topic FFWs on Isometrics
There are many requirements in a fabrication spec. It is the responsibility of the fabricator to interpret all of the clients requirements on their spool sheets. The welder uses cut sheets, NOT the Iso. The conclusion I draw is that your low opinion of the intelligence of fab shops and your lack of knowledge and obvious disdain for 3D CAD systems hardly justifies your status as a Platinum Member. It's quality of posts not quantity

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8 years 11 months ago - 8 years 11 months ago #8926 by 11echo
Replied by 11echo on topic FFWs on Isometrics
Garzabla1

…The conclusion I draw is that your low opinion of the intelligence of fab shops and your lack of knowledge and obvious disdain for 3D CAD systems hardly justifies your status as a Platinum Member. It's quality of posts not quantity


My my, did I ruffle someone’s feathers or what!?? You know I like your arrogance! I really mean that, a good piper has to have a fair amount to be really good at this profession. However you need to guard that it doesn’t close your eyes to other possibilities! …I’m here (as many are) to share my experience and to learn what others think about this great profession. I offered my “opinion” on a subject that is an issue (good or bad) with most of this industry today. You can learn from it or shut your eyes and continue blindly down the path.
You did peg me correctly as having “disdain” for 3D CAD systems, where it promotes a short cut on how to view a project, so engineers now no longer have to know how to read a technical drawing! Worse yet where it flattens that design into the “normal” 2D representation and generate drawings for construction that are so poor they don’t meet any drafting convention of the last 50 years! And lastly it gives the designer/draftsman the excuse that they can’t properly document drawings because the 3D program doesn’t have that capability! ...Or the designer the knowledge to know how!
Do you really think all fab shops generate shop dwg.s for each spool? When Iso-gen lists all the cut lengths of each spool leg? I’ve seen shops fab from Iso’s …all part of that low bidding shop subject we touched on earlier. As far as my “Platinum Member” status you are correct, it is a rating of post quality, because I’m here and I contribute …where have you been!??
I offer one last "opinion" …If you’re willing to listen to people that disagree with your ideas; you have a chance of be coming very intelligent. If you only want to talk with people that agree with you, you will learn NOTHING.
Last edit: 8 years 11 months ago by 11echo.

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8 years 11 months ago #8928 by mtvalla
Replied by mtvalla on topic FFWs on Isometrics
Hey folks,

Thanks for the interesting comments, some of which turned into a bit of a heated, close to the knuckle debate.

My own preference on this, would be to show the dimension as 575(+150) or 575+150, this clearly defines on the iso what is required of the fabricator, regardless of what supplementary notes are/are not included, also regardless of the type of role the design company has be it EPC/EPCM, also regardless of any company fabrication spec or client fabrication spec or even fabricators own fabrication spec....in some cases you may require more than +150, so clearly defining this on the iso, surely is the simplest method and clarifies any possible confusion, also correct me if I'm wrong, but if it's stated on the iso, then that should take governance.....

Cheers

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8 years 10 months ago #8967 by Colow
Replied by Colow on topic FFWs on Isometrics
Hi everyone, my 2-bobs worth.

I totally agree with mtvalla. As both a fabricator and drafter the only thing the fabricator is interested in is a clearly defined Isometric.
By the time the fab shop receives the AFC drawing all things should be sorted.
The dimension plus allowance as described above is good as it cannot be interpreted as anything else.
Isometric drawings need to be as clear as possible with a minimum of unnecessary information as possible.
Too many times now we see drawings which are very difficult to read due to either unnecessary info or too much squashed onto one page.
There is no need to have the dimensions of standard fittings on the iso which seems to be very common now. Its only a matter of configuring the iso generation software to the desired output.

Cheers
The following user(s) said Thank You: RobbC

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