Hastelloy C276 Pump liner

[Saman2002]

Our customer wants us to provide them with a Pump liner, basically a tube Ø170mm, WT=0.65mm, L=1m, made from Hastelloy C276, the problem is that they want the item to be of seamless construction, our inquiry for the seamless pipe of that dimension or machined round bar seams to not be possible according to the manufacturers.
I am looking for advice on how to manufacture this as requested by our customer and if available sources that can make it, i am also wondering how the pump manufacturer made the liner the first place (customer is not providing us with pump model to inquire from the manufacturer.

 

[BEMPE16524]

is it due to the thin wall? have you considered electrochemical machining?

 

[Saman2002]

Thank you for your response

is it possible or affordable to use the mentioned method in low quantities? we only need 2 of the mentioned tubes.

 

[EdStainless]

It was either a piece of custom-made tube or it was welded.
I think that Wiggins can make this size.
Weld, planish weld flush, anneal at 1200-1225C for 4 hours, force air cool rapidly, blast and pickle.
Sometimes tube this size are welded undersize a little and a lubricated tool steel ball is forces through them for sizing.
With a good anneal the performance will be identical.
And with welded you will get better size and concentricity control.

 

[dgeesaman]

I don't have a source, but I have the experience of a govt / nuclear sector customer who was buying a repeat machine that we built in the 80's. Everything went smoothly until we tried to buy the C-276 seamless pipe (thicker wall, similar diameter). Nobody, and I mean nobody, was willing or able to make that as seamless. Our customer went up and down on us for months and remained unwilling to accept a very thoroughly inspected welded pipe, until one day we found a slip of evidence in the old files that welded was in fact used the first time too and (shame on us) we hadn't documented that substitution very well.

I guess my point is that seamless C-276 has been hard to obtain for many years, and it's reasonable to challenge whether that requirement is based on the actual application or a different size/material.