While less common, "FI-22" has historical significance in US federal tax regulations.
1. Maritime Communication (AIS Application-Specific Messages) While less common, "FI-22" has historical significance in
: It is used for Area Notices (Broadcast) , which provide vessels with critical safety and navigational information. While less common
: In cooling system specifications (such as those for heat exchangers), FI-22 can identify a specific secondary cooling water flow indicator channel, often used to monitor flow rates in gallons per minute (gpm). While less common, "FI-22" has historical significance in