These 5 sulphur (sulfur) lines should run from there source to the sump as individual lines. Any attempt to join then into a common system is only asking for trouble. One of the branches will get plugged and it will need to be shut down, dissembled and rodded (or drilled) out.
You should use jacketed piping with steam in the jacket as the first choice. The alternate would be steam traced single pipe. The individual lines should have flanged elbows for disassemble when there is a plugging of a line.

The bottom line DON'T join the lines together!

This will also eliminate the thought of using expansion joints in sulfur lines. Bad idea.