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Piping Stud Bults and Nuts Indexing, Storage and Delivery
5

Piping Stud Bults and Nuts Indexing, Storage and Delivery

Piping Stud Bults and Nuts Indexing, Storage and Delivery

(OP)
I should be grateful if someone tell me the best practice of numbering of studs in isometric drawings and its relation to the wharehouse storage, as well as proper delivery to the fitter in order to reduce time and mismatch.
Any link to an online reference will be highly appreciated.

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

I'm not sure that I understand the question, exactly.

Perhaps you can provide a story about a (hypothetical, of course winky smile ) situation where a less than best practice was used, and time was wasted, or the parts were mismatched.

Mike Halloran
Pembroke Pines, FL, USA

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

(OP)
Thanks Mike for your reply.
You know, at this time, software automatically generate isometric drawings and it is customary to define a coding system for various parts which are used in piping, e.g. elbow,..., and studs w/nuts. Normally, these software calculates stud-bolt length based on the thickness of other relevant parts, say, flange, gasket, spade, etc. Sometimes, these calculations (which comprise number of bolting) go wrong. But my main question is after engineering documentation. In most of the projects that I was involved and had lots of bolts in it, there is a lack of making proper relation between that material code and the actual bolt that is manufactured, packed and delivered to the field. Because it is very difficult to mark, especially small, bolts with these sometimes large numbers.
what is your experience in this regard?

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

5
When I generated isometric piping drawings, the CAD system comprised me, a pencil, and no damn computer. The bolts were kept in the boxes the manufacturer put them in, and the BOM had enough info in a line to unequivocally identify that box of bolts.

... and people were paid to check drawings, and nobody thought that checking was a stupid extraneous redundant activity.

Then computers were sold to the world, partly justified by reduction in 'head count', and partly on the utterly false assertion that they would detect and/or prevent mistakes.

Then Supply Chain Managers and MBAs appeared, possibly dropped from hostile alien spacecraft, and declared that people were interchangeable and checkers were not needed and every goddamn tiny bolt on a hundred mile pipeline had to have its own globally unique barcode or the World Would End, and every operation had to hire nimrods who couldn't read any known language in order to read the barcodes and match them to the prints and ...

The End ain't going to be pretty, and in some ways I'm glad I won't be around to see it.

Oh. That doesn't solve your problem.
Nothing will.
Checkers, if you could find any, would reduce the incidence of problems such as you report. ... but the MBAs won't let you hire them, asserting that the error rate is acceptable from a business perspective, or more likely implying that if you were any good as an engineer, you'd do your own checking and the error rate would diminish without further cost. ... and the Supply Chain Manager will back up the MBAs and suggest that you can be replaced by an illiterate goatherder from just about anywhere, no offense intended to goatherders, literate or not.

You could mitigate the problem by keeping the bolts in their boxes for as long as possible, but that might reduce the amount of virtual paperwork used to justify the SCM's existence.

Or you might use smaller tags and denser '2D' barcodes, but that will require new scanners, or smartphones, and the MBAs won't go for that...


Mike Halloran
Pembroke Pines, FL, USA

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

Nice story Mike smile
Autocad generates iso's in dwg format, so You can change the boltsize.
Maybe You use another program, but mostly You can change things.(Maybe using tipp-ex)
List up with storenr.s and the problem is solved.(I think)

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

MikeHalloran,
That is a really great response post!
Thanks

Sometimes its possible to do all the right things and still get bad results

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

Bravo, MikeHalloran, Bravo !

You have made my day with:

Then Supply Chain Managers and MBAs appeared, possibly dropped from hostile alien spacecraft, and declared that people were interchangeable and checkers were not needed and every goddamn tiny bolt on a hundred mile pipeline had to have its own globally unique barcode or the World Would End, and every operation had to hire nimrods who couldn't read any known language in order to read the barcodes and match them to the prints and ...



Years ago, I have witnessed these alien spacecraft in the skies above Pittsburgh. The effect was much the same as you described.

Bravo ! !

MJCronin
Sr. Process Engineer

RE: Piping Stud Bults and Nuts Indexing, Storage and Delivery

Yay Mike! You should expand on that to make it a full article, feel free to contact me for more information.

Piping Design Central

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