Stub Up Location Accuracy
Stub Up Location Accuracy
(OP)
For stub ups from underground piping, what accuracy (and/or precision) do you design for? What is actually achieved by construction?
Of course there's a story behind this. On a recent job, a nameless construction partner was off from a namless design firm's coordinates by more than a foot and of course only 3" of clearance was designed. I've witnessed essentially the same problem at multiple design firms and multiple constrution firms. It seems to be accepted as a fact of life. Anyone have a different experience?
Of course there's a story behind this. On a recent job, a nameless construction partner was off from a namless design firm's coordinates by more than a foot and of course only 3" of clearance was designed. I've witnessed essentially the same problem at multiple design firms and multiple constrution firms. It seems to be accepted as a fact of life. Anyone have a different experience?
- Steve Perry
http://www.linkedin.com/in/stevenhperry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.





RE: Stub Up Location Accuracy
RE: Stub Up Location Accuracy
However, if you are dealing with an Pipe Installation Sub-Contractor and make PFI ES3 a part of the contract then you should be able to make them rip it out and make it right.
prognosis: Lead or Lag
RE: Stub Up Location Accuracy
The contractors' most recent claims have been that the backfill process routinely shifts whatever is in the trench. I can understand how that might happen, but are there no mitigating measures to be taken?
Perhaps shooting the coordinates should be done after backfill but before the finished surface is put on?
- Steve Perry
http://www.linkedin.com/in/stevenhperry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.
RE: Stub Up Location Accuracy
In most of our "new build" jobs,we draw all piping 3D,export co-ordinates from our CAD drawings,to a trimble total station,and then layout our pipe hits with the total stations.Generally, we(the mechanical contractor),tell the steel erectors or carpenters when they're off...
Shifting pipe while back-filling sounds like BS to me..and I've laid quite a bit of pipe..
RE: Stub Up Location Accuracy