Can’t flat-weld flanges be used in high-temperature environments? Is the welding method shown in the figure allowed?
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Can fillet welds be used at a temperature of 650°C and at atmospheric pressure, with 310S material?
Yes, no fillet welds are needed; butt-welded flanges should be used.
No, flat-face flanges are prone to thermal deformation. It is best to use high-neck butt weld flanges.
The type of flange depends on the gasket chosen; at such high temperatures, it’s not easy to select a suitable gasket.
Check the gasket standards; there is a applicable temperature range specified.