Are there effective methods to prevent ignition of vented hydrogen streams from vents using toroidal ring designs?

There is some indication that toroidal rings can reduce static buildup and ignition of hydrogen from a vent. However, while toroidal rings may help with static, they have not been proven to eliminate all static ignition sources. There are also other sources of ignition that they would not prevent, so they might reduce but not eliminate, vent stack fires. Another method that can be reliably used to reduce or eliminate unintended vent stack fires is to dilute the flow below the flammable range. This can be a potential mitigation for small releases, but often becomes impractical with larger releases due to the amount of diluent needed.