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1.6.2 Hydraulic Symbols
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The standard abbreviations in Table 1.6.2 shall be used on the hydraulic calculation form discussed in Chapter 27.
Table 1.6.2 Hydraulic Symbols
| Symbol or Abbreviation | Item |
|---|---|
| p | Pressure in psi |
| gpm | U.S. gallons per minute |
| q | Flow increment in gpm to be added at a specific location |
| Q | Summation of flow in gpm at a specific location |
| Pt | Total pressure in psi at a point in a pipe |
| Pf | Pressure loss due to friction between points indicated in location column |
| Pe | Pressure due to elevation difference between indicated points. This can be a plus value or a minus value. If minus, the (—) shall be used; if plus, no sign is needed. |
| Pv | Velocity pressure in psi at a point in a pipe |
| Pn | Normal pressure in psi at a point in a pipe |
| E | 90-degree ell |
| EE | 45-degree ell |
| Lt.E | Long-turn elbow |
| Cr | Cross |
| T | Tee-flow turned 90 degrees |
| GV | Gate valve |
| BV | Butterfly (wafer) check valve |
| Del V | Deluge valve |
| ALV | Alarm valve |
| DPV | Dry pipe valve |
| CV | Swing check valve |
| WCV | Butterfly (wafer) check valve |
| St | Strainer |
| psi | Pounds per square inch |
| v | Velocity of water in pipe in feet per second |
| K | K-factor |
| C-factor | Friction loss coefficient |
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