Making Asbuilt drawings of an existing Plant
Making Asbuilt drawings of an existing Plant
(OP)
I have to produce asbuilt drawings of an existing plant. One method is to get hold of a measuring tape and start measurement from one end manually. But lot of pipes may be difficult to access and this method seems very tedious, inaccurate and time consuming.
I want to ask what is the standard practice in this regard. Are there other methods of measuring pipe lengths, location of equipment etc.? Are there some instruments available for this purpose? Are there some articles available online on this subject?
Thanks
Zen
I want to ask what is the standard practice in this regard. Are there other methods of measuring pipe lengths, location of equipment etc.? Are there some instruments available for this purpose? Are there some articles available online on this subject?
Thanks
Zen





RE: Making Asbuilt drawings of an existing Plant
RE: Making Asbuilt drawings of an existing Plant
RE: Making Asbuilt drawings of an existing Plant
http://www.hi-cad.com/
RE: Making Asbuilt drawings of an existing Plant
Zeni
RE: Making Asbuilt drawings of an existing Plant
What tolerance are you trying to achieve?
RE: Making Asbuilt drawings of an existing Plant
Zeni
RE: Making Asbuilt drawings of an existing Plant
RE: Making Asbuilt drawings of an existing Plant
RE: Making Asbuilt drawings of an existing Plant
RE: Making Asbuilt drawings of an existing Plant
If its for MI, used risk based and you don't need to find a single 1/4" spot on some line up in the piperack every year, so iso won't help their. If you need a stress analysis, then do it for that line.
The only place I've used iso's after the plant was in full operation was the cold box, and then the best estimates came from the 3 d plastic model of the things.
RE: Making Asbuilt drawings of an existing Plant
"I have to ask, what could one ever do with iso's after the fact?"
In my career I was involved in three "Fire Rebuild" projects.
With each case, within five days after the fire I was at the site and began pulling the P&ID's and all the piping isometrics. Within fifteen days I had all the isometrics (that needed to be rebuilt) in the hands of a fabrication shop for bid and in the hands of my home office for material take-off of all material and for the preparation of RFQs for any non-fab shop material (Spring Hangers, etc) Fire rebuilds are the real "Fast Track" projects.
I believe that Client operating facilities (Refineries, Chemical Plants, etc) subject to damage by fire should keep P&IDs up to date for all modifications.
For rebuilding the piping they should keep all the isometrics.
RE: Making Asbuilt drawings of an existing Plant
on record'as built' isometrics are really imortant reference doc
At my previous employers in early 90's I came across similar post fire rehablitation effort& these proved helpful/much relied upon docs.
As regards eloctronic data archiving if this is fool proof, virus proof system alongwith sufficient back-ups;
then situation may/should be reviewed on case to case basis.
Best Regards
Qalander(Chem)
RE: Making Asbuilt drawings of an existing Plant