Equations / Friction Loss

Question 0

Equation B

Elevation pressure

Answer 0

Elevation Pressure =.5H

.5 x height in feet

Question 1

Equation A

Friction loss

Answer 1

Friction loss = CQ2L

coefficient x flow rate (flow/100)2 x length of hose in (length/100)

Question 2

Pump discharge pressure

Answer 2

PDP = NP + TPL

Pump discharge pressure = nozzle pressure (psi) + total pressure loss (friction loss and elevation pressure loss in psi)

Question 3

NPDP: net pump discharge pressure

Answer 3

NPDP =PDP - Intake reading.

Question 4

TPL: total pressure loss

Answer 4

TPL= friction loss + elevation pressure loss

Question 5

Equation F

3in hose

Answer 5

FL per 100ft =Q2

Question 6

Equation G

4in

Answer 6

FL per 100 ft= q2/5

Question 7

Equation H

5in

Answer 7

FL per 100ft = q2/15

Question 8

Gallons in 1 3/4 50ft length

Answer 8

7.5 gallons

Question 9

Gallons in 3in 50ft length

Answer 9

12.5

Question 10

Gallons in 5in 100ft length

Answer 10

107 gallons.

Question 11

Volume of a cylinder formula

Answer 11

V= pie x r2x H

Question 12

Gallons in 100ft in.

Answer 12

4 gallons

Question 13

Gallons in one cubic foot

Answer 13

7.48

Question 14

Hand method 2.5

Answer 14

Start with 2 and 100 from add by 50s including finger spacing. Friction loss equal the finger number multiplied by first digit of gpm.

Question 15

Hand method 1 3/4.

Answer 15

Start with 1 and 100 gpm. Counting fingers only. Thumb equals 12 all fingers equal 9. Gpm increases by 25 per finger. Tip of finger multiplied by number value equals friction loss

Question 16

Co E 3/4

Answer 16

1,100

Question 17

Co E 1”

Answer 17

150

Question 18

Co E 1.5”

Answer 18

24

Question 19

Co E 1 3/4”

Answer 19

10 / 15.5

Question 20

Co E 2.5”

Answer 20

2

Question 21

Co E 5”

Answer 21

.08

Question 22

Nozzle reaction solid tip

Answer 22

(1.57xd2)(np)

Question 23

Nozzle reaction fog

Answer 23

.0505 x Q (Sq/np)

Question 24

Gpm hand line

Answer 24

(29.7)(d2 x sq/np)

Question 25

Hydrant Gpm formula

Answer 25

(29.7)(c x (d2 x sq/fp)

Question 26

Hydrant coefficient

Answer 26

.7 big curve

.8 curve

.9 smooth curve

Question 27

Min flow for interior structure fire

Answer 27

95-100 gpm