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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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