Are there any shops around here that can bore out some 1" sch. 80 pipe that is 48"long?
I need to open up the ID to about 1.00"
I will be inserting a 1" OD tube and need to eliminate as much free space as possible while still being able to remove the tube later.
Any thoughts?
Get a set of conduit reamers?
They are really pricey if this is a one time deal though.
Can i ask why?
It’s not going to be an easy thing to do.
1" sch 80 is 1.315 OD X ~.957 ID
in order to get a 1" OD tube to slide inside of it, you’re probably going to need at LEAST .020" to get it to slide in without a press.
At 48" long, that’s some serious tubing.
Can’t you just buy some mechanical tubing?
1 5/16 OD X 10ga wall yields 1.044 ID
Or if you can buy 1 5/16 OD X 5/32 for a 1.00 ID (but it probably wont accept a 1" OD tube.
If you’re not locked into that OD, 1 1/4 OD X 12GA wall has a 1.032 ID
1 1/8 OD X 17GA wall is 1.009, but depending on your tolerances for the internal tube, you’re likely to run into problems… 18GA wall is 1.027 ID…
What is this for?
Good luck with that. I assume this is for work?
I’m trying to remember the name of the guy on site that has done some work for me. I doubt they have the capability, but maybe. I think he’s in building 62. Paul… Um… Howell. Talk to him.
Another problem with ERW pipe is the seam.
DOM Mechanical tubing is the way to go with slip fits. It has a much higher straightness tolerance than ERW pipe, is cold drawn and usually not some pos low carbon steel.
Paul Howell 
He does a lot of my relief testing.
This is for work, and I am not a mechanical engineer, so my knowledge base is lacking.
I will look into the mechanical tubing route, as well as ASME requirements
I need as little dead volume as possible for small gas flow at 500psi.
This contraption of mine will also be submerged in pressurized liquid N2.
My initial plan was for sch40 pipe and the 1" tube.
That left me needing to make up .049" I might try and get a ceramic sleeve or something made unless I can figure out a better way to reduce it.
I only need 4 assemblies, so its not worth buying any equipment. I would rather not need additional components as I would add to the complexity some, plus… I’m really good at breaking things.
Anyone have any gun drilling equipment locally? I remember seeing an OCC episode where they drilled out some hex bar stock for a frame…
It looks like I have two options that could work. The 1.009 ID and 1.027 ID.
Now I just need people to answer the damn phone 
Why don’t you just turn down the center piece to fit? That’d be MUCH easier than trying to drill out 48". Unless you need the center tube to be 1" OD, then ignore this post.
even so, the ID of ERW pipe is very inconsistent, it would not be a close fit.
I’m flexible in that it all has to fit in a 4" pipe.
I’m looking for a more off the shelf solution. If I can get parts that a basic machine shop can work with, then I am OK with that too.
Looks like .120 wall SS tubing is rather difficult to find. Klein -0, Robert James - 0.
MetalSupermarkets has some :).
Maybe I will get lucky with a good 10’ piece.