Tapered Piping Manufacturer
Tapered Piping Manufacturer
(OP)
I'm investigating the feasibility of fabricating tapered pipe out of Hastelloy C-276 or similar C alloy for a crude overhead line.
First I want to know if this is a crazy idea, and second I am seeking competent fabricators. Dimensions are 22" x 16" over a length of 16'. Wall thickness 0.250" or 0.375". Critical factors are sound welds without loss of corrosion resistance, and good geometric tolerances.
While we're at it, are there better filler metals than the matching C-276? I've come across several sources recommending Inconel 686.
First I want to know if this is a crazy idea, and second I am seeking competent fabricators. Dimensions are 22" x 16" over a length of 16'. Wall thickness 0.250" or 0.375". Critical factors are sound welds without loss of corrosion resistance, and good geometric tolerances.
While we're at it, are there better filler metals than the matching C-276? I've come across several sources recommending Inconel 686.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"





RE: Tapered Piping Manufacturer
RE: Tapered Piping Manufacturer
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Tapered Piping Manufacturer
(we don't do it anymore)
You might be better off doing the taper over 4' and leaving the rest straight.
You can use C22 or 686, but what really matters with these alloys is the annealing.
High temp and long times.
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Plymouth Tube
RE: Tapered Piping Manufacturer
http://www.bakertankhead.com/gallery.htm
http://www.hodgsoncustomrolling.com/services/plate...
http://www.halvorsenusa.com/steel-alloy-plate-fabr...
RE: Tapered Piping Manufacturer
Thanks for the suggestion, I had not considered shortening the taper and using straight pipe for the rest. Obviously spreading the taper over 16' adds complexity. In either case I would expect the seam weld to be made automatically on a pipe seam welder.
I've never ventured beyond C-276 before, so I'd like to know more about the annealing required for C-22 and I-686. Seems these alloys are not as interchangeable as I had assumed. Have any useful links?
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Tapered Piping Manufacturer
I'll leave it to smarter folks than me to recommend the welding alloys.
RE: Tapered Piping Manufacturer
Manual GTAW would probably be my last choice, for reasons of gross distortion.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Tapered Piping Manufacturer
RE: Tapered Piping Manufacturer
Why not add a stiffening ring to each end of the tapered pipe to keep it round. Maybe 4-6 inches back from the welded joint so that you have some room to make the but weld to the other pipe sections.
Just a thought.
Regards
StoneCold
RE: Tapered Piping Manufacturer
They are very different from each other. So you need to know the environment to select the best one. I have never seen a case though where C276 out performs any of these alloys.
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Plymouth Tube
RE: Tapered Piping Manufacturer
I believe it is generally better availability and user familiarity that favours C-276.
D. C. Agarwal (who works for VDM) gives an excellent survey in 'Handbook of Advanced Materials'.
www.amazon.com/Handbook-Advanced-Materials-Enablin...
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Tapered Piping Manufacturer
RE: Tapered Piping Manufacturer
How much flexibility (welding-wise) is there in mixing and matching these alloys?
What is the most compatible filler and do any require post-weld heat treatment of any kind?
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"