Gang Cvg wrote:
> Dear friends,
> But weld joints are definitely superior to SW ones. In
> small-bore lines, it is pretty easier to execute SW
> joints. Hence it is preferred wherever feasible. It
> applies to low-pressure setups.
> When it comes to high pressure, even for small-bore
> lines, (be it even 1/2 inch NPS), certain pipe
> specifications for specific applications call for
> butt-welded joints only. This is so, generally, for
> class 900, 1500 and 2500 lbs classes. Root passes are
> executed with TIG so that the bore remains
> uninterrupted. Joints are subjected to radiography
> also, with a suitably positioned oblique source.
> The main objection for certain fluids is from the
> crevice point of view. It initiates the so-called
> crevice corrosion in sockets.
> Cheers!
Socketwelding is a pain in the ass/godsend for designers because details can be left to contractors.
As we rely more and more on computers to do more and more of our jobs (I'm thinking specifically of young graduate engineers "interfacing" with retiring old fart operators, plant engineers and other localized experts) things will get lost.
In our business, it takes a few years to find out if we did good.
Paul Received on Mon Jul 25 03:49:00 2005
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