How do you calculate GPM?
The GPM formula is 60 divided by the number of seconds it takes to fill a one gallon container. So if you took 10 seconds to fill a gallon container, your GPM measurement would be 6 GPM (60/10 seconds = 6 GPM).
How is gpm firefighting calculated?
What is the formula for gpm? For example, a one-inch smooth bore tip will have a discharge of 210 gpm: 29.72 × 12 × 7.07 = 210 gpm.
What is the National fire Academy NFA formula for estimating fire flow based on the percent of involvement of the structure or compartment?
Fire flow = length X width ÷ 3 This formula is most easily applied if the estimated square footage of the entire structure is used to determine an approximate fire flow for the total structure and is then reduced accordingly for various percentages of fire involvement.
How many GPM is my pump?
The formula for determining the flow rate is: gallons drawn down (that were measured above), divided by the seconds required for recovery, then multiplied by 60: (Gallons / Seconds) x 60 = Gallons per Minute (GPM) flow rate..
What is the fire flow formula?
National Fire Academy Formula The NFA fire flow formula is: Required fire flow (gpm) = (length x width) ÷ 3. Using the same example, an IC arrives at a burning mercantile occupancy that measures 50 feet by 75 feet and is one story tall. The IC quickly determines that the area of the structure is 3,750 square feet.
What is the formula for water requirement for firefighting?
The basic formula in the schedule is: NFFi= (Ci)(Oi)(X +P)i Where NFFi = needed fire flow (NFF) in gal per min (L/min) Ci = a construction factor that depends on the construction of the structure under consideration Oi = an occupancy factor that depends on the combustibility of the occupancy (X = P)i = an exposure …
How does friction loss affect GPM?
Friction loss increases as flow (gpm) increases. Total friction loss varies with length — the greater the length, the higher the friction loss. Friction losses on reeled hose average about 21 percent more than for straight hose lays. Friction loss is nearly independent of pressure.
How do I calculate the GPM of my pump?
I have a pump with no tags or specifications on it. How do I find out what Gallons Per Minute (GPM) this pump is capable of? (Plunger Radius × Plunger Radius × 3.142) = Sq. Inches of Circle (Sq. Inches of Circle) × (Stroke Length) × (Number of Plungers) = Cubic Inches of Liquid Per Revolution
What is the NFA fire flow formula?
The NFA Fire Flow Formula is designed for offensive, interior operations involving direct attack. The formula becomes increasingly inaccurate if the level of involvement exceeds 50% or the resulting flow is greater than 1,000 gpm.
Is there a quick-calculation formula to calculate GPM for firefighting?
Since firefighting is an inexact science to begin with, the use of the quick-calculation formula cannot be expected to determine the exact gpm that will be specifically required for full fire control.
What is the NFA quick-calculation formula?
The NFA “quick-calculation” formula can be used as a tactical tool to provide a starting point for deciding the amount of water required at an incident scene. This will permit decisions to be made on the apparatus needed to deliver the water and the numbers of firefighters that will be needed to apply it.