Toroidals can be used but not often. Most exchanges use normal thin-wall expansion joints or thick-wall expansion joints fabricated from flanged and flued heads.
![72 inch thick wall expansion joint for a sulfuric acid plant](https://usbellows.com/wp-content/uploads/1990/07/Pict520-300x225.jpg)
Toroidals can be used but not often. Most exchanges use normal thin-wall expansion joints or thick-wall expansion joints fabricated from flanged and flued heads.