7. Theoretical Pressure Calculations

Question 1

$$$

FL=

Answer 1

FL=CQ^2L

Question 2

$$$

Appliance pressure loss

It is assumed that there is a __ psi a loss for flows less than 350 GPM and a __ psi loss for each appliance in a hose assembly when flowing 350 GPM’s or greater.

Answer 2

0 psi

10 psi

Question 3

A friction loss of __ psi for all master stream appliances regardless of flow will be used.

Answer 3

25psi

Question 4

EP =

Answer 4

EP= 0.5H

Question 5

Elevation pressure loss in a multi story building

EP=

Answer 5

EP = 5 psi x (number of stories -1)

Question 6

When considering pressure loss in an elevated waterway assume a loss of __ psi for the waterway and master stream appliance.

Answer 6

25 psi

Question 7

Solid stream nozzle=
Solid steam master stream=
fog nozzle=
Low pressure fog=

Answer 7

50
80
100
50 or 75

Question 8

$$$

When required to discharge a specified pressure, fire apparatus pump take advantage of the water pressure coming into the pumps water supply and add the required pressure to achieve ___

Answer 8

Net pump Discharge pressure NPDP