Plumbing Symbols - How To Discuss
William Burgess
Updated on June 10, 2026
Plumbing Symbols
What are plumbing symbols
Here are the meanings of the most common symbols on plumbing diagrams.
- Installation. Hydraulic pipes are represented by several lines.
- Gutter. Drain pipes appear as solid lines when they are above ground.
- Valves.
- Water supply.
- Line of fire.
- Gas pipeline.
- Shirts and elbows.
- ■■■■■■■■ and valves.
What does FLR mean in this context in the healthcare area?
Abbreviations for sanitary and fire protection
Access point access field| FLR | floor |
| PF | Fire protection |
| FPWH | Frost resistant wall hydrant |
| FS | On / off switch |
CW RISER UP (ELBOW) ID conrod DOWN (ELBOW)What does GW mean in healthcare facilities?
EXHAUST TOO FULL. VACUUM STORM (CONDENSED / INDIRECT). EXHAUST PUMPS. SWEEP.
What does HxH mean in the healthcare area?
In gravity, DWV (Drain, Drain or Vented) is the HxH dimension for ■■■■■■■■ that have a bell section at each end. H stands for hub. ■■■■■■■■ that have a bell section at one end and a straight section at the other end are classified as HxS. S stands for corner.
What does EOR mean?
Electronic Warfare Coordinator
What Does PIC Mean in Plumbing?
HVAC Industry Commission