>Just a heads up - it
looks like your new "header flange to pipe" (picture 5) was welded on the
>outside. I
think that 'acceptable practices' state that there should only be a tack weld
on the >outside
and the actual structural weld should be on the inside. What does
everyone else say? In >any event be sure to keep an eye on the
welds.
>
>Ken Powell
It depends on the
configuration. Generally, if are side loads due to thermal stress,
vibration, whatever; it is better to have a snug fit of tube through the
flange and weld on the inside. This reduces the stress on the weld and
can increase the reliability of the weld. The key in either case is the
quality of the weld and the heat treatment after the weld.
At least that’s
what I recall from my days as a practicing engineer. Mine are welded on
both sides. I’d prefer they were welded inside only.
Al