Fabrication CADmep™ > CADmep™ Users
Hanger Prefabrication
audiocycle:
At my previous company where were utilize Fabrication CADmep we setup a procedure that the field would spot check the DELTA from a 4'-0" benchmark to underside of the deck. We would utilize that DELTA and evaluate if we had enough play from the top hoop of the clevis hanger to the cross-bar in the hanger to take-up that adjustment (this also allows for rounding up/down). We would then break up the hanger fabrication packages accordingly and stretch the hanger rods per package to accommodate for that package rod-cut length. I hope that makes sense.
Axl:
Our increments are the nearest 4" or nearest 6" this mean the shop produces huge batches of hangers with the same rod length (faster production), the field has an easier time sorting them (less mistakes), we also send a label that if the field scans it (location correction), it will take them to specific information that will tell them the batch, level and others (we still need to add more information still)
APD-DB:
We prefab hangers for our customers and ship them directly to their jobsite. We round to the nearest 1/2” to eliminate so many different rod cuts especially on slope pipe. With all things figured our average time to build a hanger is 5 minutes, the time includes making a hanger map, bulk cutting rod, spray painting hangers with color from hanger map, applying a label, and organizing them in boxes. It’s all about having a streamlined process.
We usually run with about 98-100% success. They basically work so well that we never hear about issues and we are always asking how things are going. If the field is trimming hangers that is a failure in my book. We always make sure we know exactly what the structure looks like. I believe hangers are the cheapest material on the job but if prefabbed are the most valuable, they really set the pace for installing pipe and will massively increase productivity in the field.
Also your CAD hangers need to very accurate to what is being ordered.
bitterfitter:
Here we have been prefabbing pipe hangers for about 12 years now. We have tried every possible option over the years and seem to have it down. We model them exactly, and we fabricate them rounded to the 1/2". We have found that most clevis hangers are large enough to absorb any differences. Trapeze are not an issue at all. The smaller line sized clevis may be tight, but we always have the option to cut them if needed. We looked at cutting rods in 6" lengths but then we are modeling exact lengths and forcing the field to cut 100% of the rods. by using a smaller rounding value (1/2") we can use almost all of our hangers as is, and trim very few. The field and shop are both onboard and I very very rarely get negative feedback. I do also call the foreman on these jobs regularly to check in and get feedback. I found if I don't call, then issues can happen and I never hear about it until much later. If any issues do surface, they are looked into immediately until the problem is resolved and we look out for that in the future.
sheetmetalman:
--- Quote from: APD-DB on Jan 21, 2022, 12:59:59 PM ---We prefab hangers for our customers and ship them directly to their jobsite. We round to the nearest...
--- End quote ---
APD, thanks for your insight, are you modeling in Revit or CAD?
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