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B898 is it OK in ASME Exchanger

B898 is it OK in ASME Exchanger

B898 is it OK in ASME Exchanger

(OP)
The ASME 2004 Section 2B does not list (s) B898.

Where as B 898-05 (For Cladded Titanium) ASTM standard declares that the cladded material is good for pressure vessels. In fact it gives reference of ASME.

B 898 further delves on Welding repairs and even permits overlay.

Where as UNF of ASME Sec VIII Div 1 2004(Including 2006 addenda) clearly prohibits welding of titanium with any other material.

Is this an aberation or am i missing some thing??

RE: B898 is it OK in ASME Exchanger

If the material is not listed in Table UNF-23 of ASME then it cannot be used for that code of construction.

As a side note I did see a stainless tubesheet with and explosively bond layer of Zirconium which required an interlayer of Titanium for compatibility.  I wouldn't want to make an error on that design.

EJL

RE: B898 is it OK in ASME Exchanger

I am curious about clad titanium...

What is the purpose of each layer ?

Does the titanium provide an explosive bond to the base metal wheras the Zirconium would not ?

What kind of fluids require such exotic metalurgy ?

Where, on the internet, can I find out more about the bonding process ?

thank you and best regards......


-MJC

  

RE: B898 is it OK in ASME Exchanger

I believe the interlayer was so that the zirconium would properly bond to the tubesheet.  The tubes were then Zirconium and welded with a helium leak test.

I do not know off hand the application but I believe it was pretty nasty.

EJL

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