SAE Flanges & Fittings in ASME Vessels

[JackWayne]

We have been asked to quote several ASME Vessels that have both SAE Couplings and Anchor Style Flanges in them. My understanding is these are made from AISI 1020 material which isn't an ASME approved material for pressure vessels (from what I can tell anyway). How do other manufacturer's do this? Are they recertifying the material or getting custom flanges made out of SA materials?

 

[racookpe1978]

What pressure and temperature and service conditions?
What material is the tank?
What requirements (static? railroad? over the road? hazardous fluids? fatal fluids?)
What exposure to the public?
How many sites?

 

[GenB]

I think that these vessels are strictly SAE certified and not ASME. Check the aspects again and ask the customer. SAE has own requirements and are easier than ASME, as one mfr can have the certification.authorization and a non certified shop can make parts for the other shop provided the original shop supervises.

 

[JackWayne]

The vessels vary in pressure, one at 200 MAWP and one at 600 MAWP, both are 20" OD, SA-106B or SA-516-70 material. They both take normal service fluids and are essentially a separator / receiver tank. Both prints specifically call out ASME Certified. I have seen completed tanks like this that are "U" stamped. They don't call out any SAE certifications, just ASME. The fill on both is an SAE Half Coupling and they both get (2) Anchor style flanges made from AISI 1020. As far as sites I don't have that information.

 

[GenB]

you can machine the configuration and as long as the material is ASME you're okay.using acceptable Cod ematerials.
If you do not want to violate the Code get it machine from a/SA 105 materials.

 

[moltenmetal]

SAE flanges are often used for connections to compressors- these sound like compressor K/Os or expansion/pulse dampener vessels. Consider defining the vessel scope as a plain end piece of pipe at each nozzle. Leave the flanges in the piping scope.

You can obtain SAE flanges in ASME-permissible materials but ASME will require you to analyze them to use them in the vessel scope unless I'm mistaken, which I might be.

As to the anchor-style flanges, I had to look that one up- never heard of much less seen one. Would imagine they could be found forged out of A105 material if you look hard enough- somebody out there who needs a axial stop against some enormous force must be using them- we always get away with tabs plug-welded to the OD of the pipe for situations like that. If forged to near net shape can't be found, you can have them machined from bar if you do the right testing on the bar prior to machining.