Heat Treated Heads
Heat Treated Heads
(OP)
I'm building a vessel and the heads were "Cold Formed" -- the vendor has heat treated them and shipped them to me.
These heads are to have Nozzles welded into them and then (obviously) they will be welded onto the vessel Cylinder.
Am I required to Heat Treat The heads again after they have had the Pipe and Flanges welded into them?
Or am I required to wait and Heat treat the entire vessel because of this, or do I have to heat treat at all?
Thanks in advance
These heads are to have Nozzles welded into them and then (obviously) they will be welded onto the vessel Cylinder.
Am I required to Heat Treat The heads again after they have had the Pipe and Flanges welded into them?
Or am I required to wait and Heat treat the entire vessel because of this, or do I have to heat treat at all?
Thanks in advance





RE: Heat Treated Heads
RE: Heat Treated Heads
What is the material of the heads and thickness?
RE: Heat Treated Heads
RE: Heat Treated Heads
The vendor heat treated the heads after forming them is all I know - I don't have his process, or his temp/hold times.
They were baked out after being formed is all I know at this point
RE: Heat Treated Heads
RE: Heat Treated Heads
RE: Heat Treated Heads
I will also buy Hot formed heads next time.
RE: Heat Treated Heads
RE: Heat Treated Heads
I don't have the paperwork on the vendors stress relief procedure yet, but I will. The vendor is very reputable and I'm certain the heads comply to the B&PV code.
It is a small vessel (7 feet x 36" od)
RE: Heat Treated Heads
Does your shop have an ASME U-Stamp Authorization?
RE: Heat Treated Heads
RE: Heat Treated Heads
RE: Heat Treated Heads
I think most people believe that if the heads are heat treated, then you cannot weld or burn on them without heat treating them again.
And if you can, then it's because of an exemption somewhere that spells it out.
So, you just work under the assumption that because PWHT wasn't a service requirement from my client - then I don't have to heat treat the whole vessel because the heads happened to
get a heat treat off-site
RE: Heat Treated Heads
RE: Heat Treated Heads
RE: Heat Treated Heads
Is a "WELD REPAIR" considered to be the act of welding/adding nozzles and a skirt cylinder to the 2:1 elliptical head?
RE: Heat Treated Heads