Fireground hydraulics and pump operation

Question 1

-+The study of the use and movement of water, especially as pertaining to the extinguishment and control of fires

Answer 1

Hydraulics

Question 2

Calculations found on the pump card are based on hydraulic formulas and flow meter readings giving you…..

Answer 2

Approximate gallons per minute

Question 3

PDP

Answer 3

Pump Discharge pressure

Question 4

H

Answer 4

Head or height

Question 5

NP

Answer 5

nozzle pressure

Question 5

NP

Answer 5

nozzle pressure

Question 6

Boiling temp of water

Answer 6

212

Question 7

Weight of water per cubic foot

Answer 7

62.5

Question 8

How much does a gallon of water weigh?

Answer 8

8.33

Question 9

of gallons contained in one cubic foot of water

Answer 9

7.5

Question 10

GPM of 2 1/2 with a fog tip

Answer 10

250

Question 11

PSI is calculated by dividing the pounds per square foot (62.5) by 144 (sq inches in one sq ft)=.434 PSI. What will be used for fireground calculations?

Answer 11

.5 or 1/2 pound per foot

Question 12

Pressure exerted by the weight of the water is directly proportional to the….

Answer 12

Height or head

Question 13

How many PSI is considered for each floor (after the first)?

Answer 13

5. example 5th floor 20 psi

Question 14

Smooth bore nozzle pressure at the tip (hand and master strream)

Answer 14

50 PSI. 80 PSI

Question 15

Fog Nozzle pressure at tip (hand and master stream)

Answer 15

75 and 100 psi

Question 16

FL for 1 3/4 fog per 100 ft

Answer 16

25

Question 17

FL for 15/16 smooth bore per 100 ft

Answer 17

35

Question 18

2 1/2 fog and 1 1/8 smooth bore per 100 ft FL

Answer 18

10

Question 19

1 1/4 smooth bore FL per 100 ft

Answer 19

15

Question 19

1 1/4 smooth bore FL per 100 ft

Answer 19

15

Question 20

What brand are the 1 3/4 combo nozzles

Answer 20

Akron

Question 21

Static pressure less residual pressure/static pressure

Answer 21

% drop

Question 22

0-10% drop, 11-15% drop, and 16-25% drop

Answer 22

3 more like volumes, 2 more like volumes, 1 more like volumes

Question 23

100 PSI static drops to 90 PSI residual= 10% drop or

Answer 23

3 more like volumes

Question 24

pressure loss for in line foam eductor

Answer 24

100 psi

Question 25

Appliance pressure loss is this when flowing over 350 gpm

Answer 25

10 psi

Question 26

How much pressure loss for a dry manual standpipe connection when the combined outlet flows are over 350 gpm

Answer 26

25 PSI

Question 27

When pumping into an activated sprinkler system, the system is supplied by city water pressure only, pump at ____ psi

Answer 27

150

Question 28

When relay pumping, determine the GPM being discharged by the attack engine to figure friction loss for the hose layout. Next identify your hydrant residual pressure and add that pressure to your friction loss pressure to set ....

Answer 28

Your pump discharge pressure

Question 29

What are % of Silv-Ex?

Answer 29

.1 and .3%

Question 30

To determine friction loss in 5"

Answer 30

Use 3-3" hose table

Question 31

Always figure out the pump problem from the ___ back to the pump

Answer 31

nozzle

Question 32

Proper sequence for calculating.

Answer 32

Nozzle, appliance near the tip(if flow is over 350gpm add 10 psi), Determine friction loss of hoses, Head,head, Add 10 PSI for appliance over 350 gpm, manual standpipe (25PSI)

Question 33

One 2 1/2 line 100 ft, wyed into two 1 3/4 lines 100 ft each with fog tips, going up hill 20 ft

Answer 33

NP 75 (fog nozzle) FL1 25 (100ft 1 3/4) FL2 15 (100ft 2 1/2 H 10 (20 ft uphill) A: 0 SP:0 125PSI

Question 34

Single stage pumps should only be involved in tandem pumping if they are..

Answer 34

The water supply source engine

Question 35

Two stage pumpers can pump in either pressure (series) or ....

Answer 35

volume (parallel)

Question 36

A two stage pumper should always be in ___ when pumping to a master stream

Answer 36

volume

Question 37

Never change from volume to pressure above 75PSI. The change -over should always be performed with the engine at idle. This could ___ the existing pressure

Answer 37

Double

Question 38

How is pump rated?

Answer 38

Drafting water through 20 ft of hard suction, the water source 10 ft below the eye of the impeller

Question 39

Each engines pump is able to supply 1500 GPM at ___PSI

Answer 39

150

Question 40

Pump operators should always keep at least ___ PSI on their intake gauge to avoid cavitation

Answer 40

20

Question 41

If pump wont go into gear, what is the last thing to do?

Answer 41

Shut apparatus down

Question 42

Priming the pump ____ be necessary unless there is cavitation or the need for drafting occurs

Answer 42

Should not

Question 43

A normal priming should only take ____ seconds. After ___ seconds and it has not primed, there is an airleak or the pump is defective

Answer 43

10-20 seconds, 45 seconds

Question 44

Procedure where two or more engines share a single water source

Answer 44

Dual pumping

Question 45

Operation where several engines are in a series to overcome distance, head or friction loss problems

Answer 45

Dual pumping

Question 46

Shorter relay pumping operation where the goal is to achieve higher pressures

Answer 46

Tandem

Question 47

Trucks 1/8 are preplumbed and need...... to reach 2000 gpm

Answer 47

2 engines

Question 48

Number of gallons of water in a cubic feet of water

Answer 48

7.5

Question 49

To find the area of the base of a cylinder, use the formula .______

Answer 49

.7854xd2

Question 50

Shortcut formula approximate capacity of a round tank

Answer 50

d2x6xL