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Aarons Drivers Test FORMULAS > Formulas > Flashcards

Formulas Flashcards

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1
Q

Calculating Needed Fire Flow:

A

GPM = (Length x Width)
—————————————
3 x % of involvement

25,50,75,100% involvement

Page 100 ST

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2
Q

Placing the butt of a ladder for an ideal climbing angle:

A

Used L/4= distance the butt should be from the building.

Divide the used length of the ladder by four.

(The use length of a ladder is the vertical distance above the ground were the latter contact the building.)

Page 126 T

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3
Q

Calculating Thermal Radiation Intensity:

A

(T) to the 4th power

70° outside with a fire temperature of 1000°?

Fahrenheit can be converted to Rankine (R) using the formula-
R= (°F -32) + ( 491.67)

(Fire temp in R)to the 4th / (ambient temp in R) to the 4th

(1,460R)to the 4th / (530R) to the 4th = 57.6

Page 31 BC

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4
Q

Determining the Fire Load:

A

Weight of combustibles multiplied by the heat of combustion- expressed in pounds per square foot

Page 54 BC

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5
Q

Convert head in feet to head pressure:

A

Divide the number of feet by 2.304 = head pressure psi

Page 175 P&A

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6
Q

GPM or Discharge Rate:

A

GPM= 29.7 x D squared x square route of NP

Page 195 PA

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7
Q

Nozzle reaction for SOLID stream nozzles:

A

NR= 1.57 x D squared x NP

Page 203

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8
Q

Nozzle reaction for FOG stream nozzles:

A

NR= .0505 x Q x square route of NP

Page 204 PA

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9
Q

Friction loss:

A

FL= CQ squared L

Page 212 PA

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10
Q

Elevation pressure loss FEET:

A

EP= .5H

Page 214 PA

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11
Q

Elevation pressure loss MULTISTORY BUILDING:

A

EP= (5psi) x (Number of Stories-1)

Page 214 PA

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12
Q

Pup Discharged Pressure:

A

PDP= NP + TPL

Page 218

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13
Q

Net Pump Discharge Pressure (positive pressure source):

A

NPDP (positive pressure source) PDP - Intake Reading

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14
Q

Condensed Q:

A

3”
FL= Q squared

4”
FL= Q squared/ 5

5”
FL= Q squared/15

Page 288 PA

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15
Q

GPM Flowing Friction Loss calculation method:

A

Page 289 PA - study
Memorize 100-160 GPM 2.5” flow
100=3, 110-120=4, 130-140=5, 150=6,160=7

170-300 GPM - sub 10 from first 2 numbers (@300GPM 20 psi FL)

320- 400 GPM- add 3 psi per 20 extra GPM (@400 GPM you add and additional 15psi to the 300GPMs 20psi)

420-500 GPM- add 4 psi per 20 extra GPM (@500 GPM you add an additional 20psi to the 400GPMs 35psi)

Page 289. PA

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16
Q

Additional Water Available- Percentage Method:

A

Static-Residual x 100 / Static

If answer matches table 10.1 numbers add corresponding lines:
0-10 add 3x amount being delivered

11-15 add 2x amount being delivered

16-25 add 1x amount being delivered

25+ do not add

Pages 348/349

17
Q

Additional Water Available- First Digit Method:

A

Static - Residual= A

Multiply the FIRST DIGIT of the static by 1,2, or 3

If the psi drop (A) is equal to or less than the static Multiplied by 3, than 1 additional equal flowing lines can be added.

Multiplied by 2, than 2
Multiplied by 1, than 3

Page 349 PA

18
Q

Additional Water Available- Squaring the Lines:

A

Static - Residual= A
Number of desired TOTAL lines SQUARED = B

A x B = C (total psi loss)
Finally take STATIC Pressure - C = (20 psi or more?)

Page 350 PA

19
Q

Assumed Flow Rates for Squaring the Lines Method(additional water available Table 10.2):

A

1 1/2 inch 125 GPM
1 3/4 175
2 200
2 1/2 250

Page 351 PA

20
Q

Calculating Theoretical Lift:

A

Actual atmospheric pressure X waters pressure per square foot in intake hose

Page 404 PA

21
Q

Determining Max Lift:

A

L= 1.13 Hg (inches of Mercury)

Page 405 PA

22
Q

Pressure Correction:

A

PC= Lift + Total Intake Hose Friction Loss/ 2.3

750 gpm 4” 7 psi per 10’— 8.5 per additional 10’
5” 4.5 psi per 10’— 5.5 per additional 10’

1000 gpm 5” 4.5 psi per 10’— 6 per additional 10’

1250 gpm 5” 12.5 psi per 10’— 14.5 per additional 10’

Page 408 PA

23
Q

Net Pump Discharge Pressure (Draft):

A

NPDP (Draft)= PDP + PC

Page 409

24
Q

Square or Rectangle Pool Capacity:

A

C= 7.5 x L x W x D

Page 416

25
Q

Round Pool Capacity:

A

C= 7.5 x pie r squared x D

Page 417

26
Q

Relay Distance:

A

P= R/D + 1

R= relay distance 
D= distance from table 12:1

Page 430 PA

27
Q

WATER SHUTTLE Flow Rate:

A

Flow= .9 x TS / Travel/Trip Time

Travel/ Trip Time = ROUND trip

Page 465 PA

28
Q

Travel Time:

A

Travel = (1.7) Distance + .65

Time = minutes 
Distance = ROUND-trip

Page 466 PA

29
Q

Handling Time:

A

Handing Time= Fill Site Time + Dump Site Time

Page 466 PA

30
Q

TENDER Flow Rate:

A

Flow= .9 x TS / Travel + Handling Time

Page 465 PA

31
Q

Back Pressure while Educting Foam:

A

BP= NP + FL( from eductor to nozzle) and Elevation Pressure

Page 495 PA

32
Q

Foam Application Rate for specific nozzle:

A

AR= Flow Rate/ Fire Area sq/ft

Page 491 PA

33
Q

Percent of Concentration in Foam Solution:

A

%= Conductivity of Solution - Conductivity of Water /500

Page 530 PA

34
Q

Kinetic Energy or Wind/Falling object:

A

E= 1/2 MV squared

Page 71 BC

35
Q

Fill/Dumps Site Times:

A

Fill Time = M-B + (capacity/flow)

(Dump Time is the same; Handling Time is the total of Fill+Dump Time)

Aarons Drivers Test FORMULAS (1 decks)

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