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PFR week 2 > Fireground hydraulics and pump operation > Flashcards

Fireground hydraulics and pump operation Flashcards

1
Q

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

A

Hydraulics

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2
Q

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

A

Approximate gallons per minute

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3
Q

PDP

A

Pump Discharge pressure

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4
Q

H

A

Head or height

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5
Q

NP

A

nozzle pressure

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5
Q

NP

A

nozzle pressure

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6
Q

Boiling temp of water

A

212

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7
Q

Weight of water per cubic foot

A

62.5

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8
Q

How much does a gallon of water weigh?

A

8.33

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9
Q

of gallons contained in one cubic foot of water

A

7.5

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10
Q

GPM of 2 1/2 with a fog tip

A

250

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11
Q

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?

A

.5 or 1/2 pound per foot

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12
Q

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

A

Height or head

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13
Q

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

A
  1. example 5th floor 20 psi
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14
Q

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

A

50 PSI. 80 PSI

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15
Q

Fog Nozzle pressure at tip (hand and master stream)

A

75 and 100 psi

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16
Q

FL for 1 3/4 fog per 100 ft

A

25

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17
Q

FL for 15/16 smooth bore per 100 ft

A

35

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18
Q

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

A

10

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19
Q

1 1/4 smooth bore FL per 100 ft

A

15

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19
Q

1 1/4 smooth bore FL per 100 ft

20
Q

What brand are the 1 3/4 combo nozzles

21
Q

Static pressure less residual pressure/static pressure

22
Q

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

A

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

23
Q

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

A

3 more like volumes

24
Q

pressure loss for in line foam eductor

25
Q

Appliance pressure loss is this when flowing over 350 gpm

26
Q

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

27
Q

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

28
Q

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 ….

A

Your pump discharge pressure

29
Q

What are % of Silv-Ex?

A

.1 and .3%

30
Q

To determine friction loss in 5”

A

Use 3-3” hose table

31
Q

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

32
Q

Proper sequence for calculating.

A

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)

33
Q

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

A

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

34
Q

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

A

The water supply source engine

35
Q

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

A

volume (parallel)

36
Q

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

37
Q

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

38
Q

How is pump rated?

A

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

39
Q

Each engines pump is able to supply 1500 GPM at ___PSI

40
Q

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

41
Q

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

A

Shut apparatus down

42
Q

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

A

Should not

43
Q

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

A

10-20 seconds, 45 seconds

44
Q

Procedure where two or more engines share a single water source

A

Dual pumping

45
Q

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

A

Dual pumping

46
Q

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

47
Q

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

48
Q

Number of gallons of water in a cubic feet of water

49
Q

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

50
Q

Shortcut formula approximate capacity of a round tank

PFR week 2 (5 decks)

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