Pumping Formulas

Question 1

What is the handline friction loss formula?

Answer 1

((GPMxHSF)/10)-10= fl per 100ft friction loss

Question 2

What is the equation to figure pump pressure for hand lines?

Answer 2

Ep= NP + FL + AV +- EL

EP= Engine Pressure
NP= Nozzle Pressure
AV= Appliance Value
EL= Elevation

Question 3

What are the hose size factors to figure friction loss in a handline?

Answer 3

1 1/2” = 4
1 3/4” = 3
2” = 2
1 1/2” = 1

Question 4

What is handline solid stream rule of eight?

Answer 4

1”= 200 gpm
1 1/8” = 250 gpm
1 1/4” = 300 gpm
1 3/8” = 350 gpm

Question 5

What is the nozzle pressure for a solid stream and fog nozzle?

Answer 5

Solid is 50 psi/80 psi master

Fog is 100 psi

Question 6

What is maximum handline gpm ?

Answer 6

350 gpm

Question 7

How many firefighters are needed to man a 125 gpm line?
How many for 250 gpm line?
How many for 350 gpm line?

Answer 7

125 gpm = 1 FF
250 gpm = 2 FF
350 gpm= 3 FF unless safely secured

Question 8

What are the handline appliance value for gated wye and a stand pipe?

Answer 8

Gated wye = 10 psi

Standpipe= 20 psi

Question 9

At what pressure do you pump standpipes at?

Answer 9

Nothing showing = 0 or 100 psi

Smoke and flame = 150 psi

Question 10

What is the friction loss formula for master stream and supply lines?

Answer 10

Q x (Q -1)/ HSF

Question 11

What are the hose size factor coefficients for master stream and supply line?

Answer 11

3”= 1
3 1/2”= 2
4”= 4
5” = 12

Question 12

What are the master stream appliance values?

Answer 12

Siamese= 10 psi
Triamese= 10 psi
Portable monitor= single inlet 0 psi, dual inlet 25 psi
Humat valve= 15 psi
Deck gun = 25 psi
Ladder pipes= 0 psi
Forward pumpers= 20 psi

Question 13

As a ladder truck operator what values do you add together to determine engine pressure?

Answer 13

Add together nozzle pressure, elevation, and appliance value.

Question 14

What are master stream smooth bore gpm? (rules of eight)

Answer 14

1"= 200 gpm
1 1/8= 300 gpm 
1 1/4= 400 gpm
1 3/8= 500 gpm
1 1/2= 600 gpm
1 5/8= 700 gpm
1 3/4= 800 gpm
1 7/8= 900 gpm
2"= 1000 gpm

Rule of eight: multiple bottom number to get eight, then take the number you multiples and multiple it to the top number and add 2 to get your gpm.