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18 Cards in this Set
- Front
- Back
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GPM
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GPM = (29.7)x(D^2)x(√NP)
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GPM (open butt of 2 1/2")
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GPM (open butt of 2 ½”) = (26.7)x(D^2)x(√NP)
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Tip Size
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Tip Size = √(GPM/(29.7)x(√NP))
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Nozzle Pressure
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NP = (GPM/(29.7xD^2))2
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Friction Loss
(GPM >100) |
FL = 2Q^2 +Q (Q represents GPM divided by 100)
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Friction Loss
(GPM < 99) |
FL = 2Q^2 +(1/2)Q
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Hypotenuse of a Triangle
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Hypotenuse of a Triangle = √(A^2+B^2)
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Area of a Cylinder
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Area of a Circle = (.7854)x(D^2)
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Volume of a Cylinder
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Volume of a Cylinder = (.7854)x(D^2)x(Height or Length)
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Head Pressure
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Head Pressure = (2.31)x(P)
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Back Pressure
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Back Pressure = (.434)x(H)
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Stopping Distance
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Stopping Distance = (mph^2)/20
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Velocity
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(8)x√H or (12.14)x√P
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Sprinkler GPM
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Sprinkler GPM = (1/2)(P) + 15 (# of heads)
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Drafting
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Lift = 1.13 x Hg
Lift = .885 x height |
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Nozzle Reaction
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Nozzle reaction = (1.5)x(D^2)x(P)
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Momentary Nozzle Reaction
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Momentary Nozzle Reaction = (1.8) x(D^2)x(P)
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Fog Nozzle Reaction
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Fog Nozzle Reaction = (.0505)x(GPM)x(√NP) → ≈ ½ the GPM is a rule of thumb
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