# Formulas

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1. Emgine Pressure
NP + FL +/- Head + Appliance
2. Net Pump Pressure
Hydrant = EP - Intake Pressure

• Drafting = EP + Pressure Correction (Feet of Lift + FL)
• 2.3
3. 2 (Q) 2 x L
• Q = Quantity of water flowing
• L = 100' Lengths of 2 1/2 Hose
4. Volume of a Cylinder
.7854 x D2 X H or L = Cubic Feet

D2 6L = Gallons

5. Pressure at the bottom of a container
Height x .5 = Pressure (Field)

Height x .434 = Pressure (True)
6. Pressure at the bottom of a container

*PSI are given
PSI @ bottom x 2.304 = Height
7. Fire Flow Solid Stream
29.7 x D2 x Square Root NP = GPM

30 x D2 x Square Root NP (Field) = GPM
8. Fire Flow Solid Stream (Open Butt)
29.7 x D2 x Square Root NP x .9
9. Nozzle Reaction Solid Stream
1.5 x D2 x NP

True = 1.57 x D2 x NP

10. Nozzle Reaction Fog Stream
.5 x GPM

True = .0505 x GPM x Square Root NP

11. Round Pools
(Amount in Gallons)
3.14 x R2 x D x 7.5
12. Square / Rectangular Pools
(Amount in Gallons)
L x W x D x 7.5
 Author: Neptune2633 ID: 26489 Card Set: Formulas Updated: 2010-07-16 02:24:04 Tags: Formulas Folders: Description: Various Formulas Show Answers: