Friction Loss Rules

Question 0

How do you determine friction loss for a pre-connect 200’ long 1 3/4” nozzle with a smoothbore nozzle?

Answer 0

Determine flow from the nozzle and subtract 30.

Question 1

How do you determine friction loss for a pre-connect 200’ long 1 3/4” nozzle with a 100 psi fog nozzle?

Answer 1

Add 20 to the desired GPM flow

Question 2

How do you determine friction loss for 2 1/2” hose?

Answer 2

Take required flow and subtract 10 from the first two digits.

400 GPM
-10
30# per 100’ of hose

Question 3

How do you determine friction loss for 3” hose?

Answer 3

Flow in GPM = even 100’s amount (200, 300)
Multiply hundreds digit by the next lower number:
200 x 1 = 2# FL per 100’ of hose
300 x 2 = 6# FL per 100’ of hose
400 x 3 = 12# FL per 100’ of hose

Flow in GPM = in between, 50’s amount (250, 350)
Square hundreds digit:
250 GPM = 2 x 2 = 4# FL per 100’ of hose
350 GPM = 3 x 3 = 9# FL per 100’ of hose
450 GPM = 4 x 4 = 16# FL per 100’ of hose

Question 4

Friction loss for 5” hose per 100’ at 500 GPM?

Answer 4

2#

Question 5

Friction loss for 5” hose per 100’ at 750 GPM?

Answer 5

5#

Question 6

Friction loss for 5” hose per 100’ at 1000 GPM?

Answer 6

10#

Question 7

Friction loss for 5” hose per 100’ at 1250 GPM?

Answer 7

15#

Question 8

Friction loss for 5” hose per 100’ at 1500 GPM?

Answer 8

20#

Question 9

Friction loss for 5” hose per 100’ at 1750 GPM?

Answer 9

25#

Question 10

Friction loss for 5” hose per 100’ at 2000 GPM?

Answer 10

30#

Question 11

For smoothbore nozzles, what psi goes to a handline?

Answer 11

50

Question 12

For smoothbore master stream nozzles, what psi is necessary?

Answer 12

80

Question 13

How much psi is necessary for fog nozzles?

Answer 13

100

Question 14

What is the maximum flow for a handline?

Answer 14

350 GPM