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*NFPA Apparatus > 7. Mathematics for the driver operator > Flashcards

7. Mathematics for the driver operator Flashcards

1
Q

To extinguish a fire sufficient flow must be applied to overcome the heat generated by the fire- a rate referred to

A

Critical rate of flow

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2
Q

PDP =

A

PDP = NP + FL

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3
Q

Nozzle psi

A

Combination nozzle or fog nozzle 100 psi

Low pressure fog 50 to 75 psi

Solid steam 50 psi

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4
Q

Distributor nozzle psi

A

100 psi

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5
Q

Elevated smoothbore master stream psi

A

80 psi

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6
Q

Nozzle reaction for a smoothbore

NR =

A

NR = 1.57 x d^2 x NP

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7
Q

Now is a reaction for a fog nozzle

NR =

A

NR = 0.0505 x gpm x NP squared

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8
Q

If you double the speed of water the friction loss will increase ___ times

A

4x

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9
Q

FL=

A

FL = C Q^2 L

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10
Q

Water exerts a pressure of

A

0.434 psi per 1 ft of water column

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11
Q

Elevation pressure =

A

EP = 0.5H

5 psi for every floor above the first

10ft per floor common

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12
Q

Friction loss for appliances when flowing less than 350 GPM

A

0

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13
Q

Friction loss in appliance when the flow rate is 350 GPM’s or greater

A

10 psi

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14
Q

Friction loss for all master stream appliances

A

25 psi

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15
Q

Three methods used to calculate the friction loss in lines to the Siamese connection

A

Split flow
coefficient
percentage

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16
Q

As a general rule you should not exceed a PDP __ psi in a standpipe

A

200 psi

17
Q

Simply add ___ psi to account for the standpipe riser

A

25 psi

18
Q

Pressure regulating valves are installed on standpipe risers where static pressure exceeds __ psi

A

175 psi

19
Q

To determine the head pressure, divide the height of the column in feet by

A

2.31

20
Q

Note

A

PDP = NP + FL

FL = C Q^2 L + AL + EP

21
Q

The subtracting method determines friction loss in 2 1/2 inch hose only and for flows of __ GPM or greater

A

160

22
Q

The fastest and easiest way to calculate the available water from a hydrant is to use the ___ method

A

First digit method

*NFPA Apparatus (20 decks)

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