21 JANUARY 2003
SUGGESTED VALVE TAGGING METHOD
A4.1. Flow Direction Control Valves. For valves operated manually by FMF personnel to control the
direction of flow, use a capital "O" (for operating) followed by a number (i.e., "O-1"). When the
system is not in operation, these valves are normally open (NO) or normally closed (NC). The
complete valve designation would be "O-1-NO," or "O-2-NC."
A4.2. Maintenance Valves. Manually operated valves used by LFM personnel while performing
maintenance are usually open, except during a test. These valves would use a capital "M" followed by a
number (i.e., "M-1," "M-2").
A4.3. Automatic Valves. Automatic valves will be labeled "A-1," "A-2," and the like. Typical
automatic valves are check, pressure relief, and automatic diaphragm types.