Pump Numbers Flashcards
#s
How many cubic inches in 1 cubic foot?
1728 cubic inches
How many cubic inches in one gallon of water?
231 cubic inches
How many gallons of water in one cubic foot of water
7.5 gallons
How much does 1 gallon of water weigh?
8.35 lbs
How much does 1 cubic foot of water weigh
62.5 pounds
1 pound of pressure will elevate water how many feet in a column?
2.3 feet
1 foot of water in a column will exert a pressure of how many pounds
.434 lbs
What is back pressure/head pressure considered to be?
1/2 lb per foot or 5 lbs per floor
Reach of a stream is considered how many feet per pound of pressure?
1 foot per pound of pressure
What does NHFD consider the average floor height of a building?
12 feet per floor
What does the NHFD consider for the nozzle pressure of a 2 1/2” straight stream and a master stream or monitor stream?
- 50 pounds for a 2.5 straight stream
- 80 pounds for a master stream
What is the nozzle pressure of a 1 1/2” & 2 1/2” fog stream?
100-125 pounds
What do low pressures nozzles operate at?
50 pounds
What is the friction loss of a cellar pipe
ladder pipe
monitor nozzle
deluge set
15 pounds
Deck gun friction loss
15 pounds (add 5 pounds for height when monitor nozzles are mounted to apparatus
2.5 inch wye/siamese friction loss
5 pounds
Sprinkler/stand pipe friction loss
25 pounds overall
Inline eductor friction loss
allow for 30% friction loss
Friction loss equation
2xqxq+q q=GPM/100
Nozzle pressure equation
Engine pressure-friction loss-back pressure
Engine pressure
Nozzle pressure+friction loss+back pressure
