On Sep 9, 2005, at 1:06 PM, Brighton Yuhoo wrote:
> 1- If a pipe and a flang to be welded to-gether, should they have
> close grade (Tensile Strength)? Is it because equal thicknesses?
Equal thicknesses help, but weld compatibility is the main driver. No
point welding a stainless or Cr-Mo flange to a carbon steel pipe. The
welding is a nuisance and you don't gain anything.
> 2- Which material group do Falnge WN A694 Gr.f65 & Gr.f70 belong to?
> Does F65 denote tensile strength of 65 ksi for this flange?
You should check your own set of specifications or the piping code for
specification particulars. A-694 covers a lot of stuff. Your guess
probably right, but the UTS may vary with thickness or processing
variables.
> 3- Can pipe API 5L Gr.X70 be welded to Flange WN A350 Gr.LF6?
Sure, provided you have a qualified weld procedure and welders who are
qualified to use it. I'm not finding Gr LF6 in my (old) Section II
listing but it's probably an alloy steel, so a proper weld procedure is
a must.
Christopher Wright P.E. |"They couldn't hit an elephant at chrisw@skypoint.com | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
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