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Hydralic Theory & Practical Applications Flashcards

1
Q

One cubic ft contains ___ gallons?

A

7.5

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2
Q

One cubic ft of water weighs __ lbs.

A

62.5 lbs

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3
Q

How much doea 1 gallon of fresh water weigh?

A

8.33 lbs

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4
Q

A column of water 1 ft high exerts a pressure of what at its base?

A

.434 psi

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5
Q

50 ft of 1 3/4 contains how many gallons of water?

A

6.24

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6
Q

50 ft of 2 1/2 in hose contains how many gallons of water?

A

12.74

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7
Q

50 ft of 3 in hose contains how many gallons of water?

A

18.35

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8
Q

100 ft of 4in hose contains how many gallons of water?

A

65.25 gallons

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9
Q

Nozzle Pressure for handlines with SMOOTH BORE NOZZLES is ___ but can be increased to ___ psi to achieve higher flow.

A

50 psi, 65 psi

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10
Q

Nozzle Pressure for master streams with SMOOTH BORE NOZZLES is __ psi, but can be increased to __ psi to achieve higher flow rates.

A

80 psi, 100 psi

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11
Q

Akron assault nozzles are designed for a nozzle pressure of what?

And flows ______ or ________

A

50 psi Nozzle Pressure

175 gpm or 185 gpm with breakaway 15/16 slug.

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12
Q

What is the Nozzle pressure for all other Fog Nozzles?

A

100 psi

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13
Q

Define a Centrifugal Pump?

A

Used in All modern fire apparatus, takes advantage of incoming pressure, water enters eye of pump then traveks through one or more impellars.

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14
Q

Define a Primer Pump?

A

Small positive displacement pump used to evacuate air from centrifugal pump housing allow pump to recieve water.

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15
Q

What is the formula to determine the volume for a rectangle or square container in gallons?

A

L’ x W’ x D’ x 7.5

Length x Width x Depth (or average depth) x 7.5

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16
Q

To determine the Volume of a cylinder, pipes, or hose in gallons using what formula?

A

3.14 x radius squared × height or length x 7.5

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17
Q

Theoretical Tip Sizes and GPM for a handline

A 
1/2"  53 GPM
7/8" 161 GPM
15/16" 185 GPM
1 "       210 GPM
1 1/8"  266 GPM
1 1/4"  328 GPM
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17
Q

Theoretical Tip Sizes and GPM for a handline

A 
1/2"  53 GPM
7/8" 161 GPM
15/16" 185 GPM
1 "       210 GPM
1 1/8"  266 GPM
1 1/4"  328 GPM
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18
Q

Fire Ground Calculations
Tip Size and GPM for
Handline

A 
1/2"    50 GPM
7/8"    150 GPM
15/16" 185 GPM
1"         200 GPM
1 1/8"  250 GPM
1 1/4"  325 GPM
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19
Q

Theoretical Tip Sizes and GPM for

Master Stream Operation

A 
1 1/4"    415 GPM
1 3/8"    502 GPM
1 1/2"    598 GPM
1 3/4"    814 GPM
2 "          1,062 GPM
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20
Q

Fire Ground tip sizes and GPM for

Master Streams

A 
1 1/4"    400 GPM
1 3/8"    500 GPM
1 1/2"    600 GPM
1 3/4"    800 GPM
2"           1000 GPM
21
Q

What does each handline/noozle flow?

A

Akron Assault 175 gpm
Mercury Monitor. 500 GPM
Master Stream
Fog Noozle 150-2000 GPM

22
Q

Pump the 1” Forestry Hose at what?

23
Q

What do.you pump the decon shower at? And how many gpms does it produce?

A

270 gpm at 75 psi

24
Piercing Nozzle is pumped at? How many GPM's?
125 gpm @ 100 psi
25
What do.you pump the 2 1/2" in distributor noozle at? Hoe many gpms? What does the 1 1/2" flow, and what pressure?
250 gpm @ 100 psi 95 gpm @ 50 psi
26
2 1/2 " cellar noozle flows how many gpm, and what pressure? 1 1/2" cellar nozzle?
350gpm@ 100 psi 160 gpm @ 100 psi
27
When figuring elevation pressure in your equation, what number do you use?
For every foot up, add .434 For every ft down, subtract .434
28
Formula to calculate PDP?
PDP= NP+FL+AL+EP Nozzle Pressure + Friction Loss+ Appliance Loss + Elevation Pressure
29
What is the max PDP?
250 psi
30
The JS 10 Foam nozzle is rated for ____ gpm at ____ psi at the tip.
100, 100
31
Portable Foam Eductor flows between 95 to 125 gpm with a PDP of _____ at the eductor.
200
32
Eductor must be placed ___ from the pump panel, and within ____ of the nozzle.
50 ft, 200 ft
33
Define an Around the Pump system?
It allows Foam to flow from all discharges, hydralic calculations are the same as water, if being supplied from another source, tank to pump valve must be kept closed. Intake pressure shoukd not exceed 10 psi.
34
Husky Foam System | Define. What percentage do we carry, and what pressure is it pumped?
Direct injection jnto the front bumper discharge, | 0.1%-3% at 150 psi.
35
Minimum amount of foam carried on ALL Fairfax County pumpers?
40 Gallons
36
CAFS has the ability to flow what?
Water, water and Class A/B Foam, Class A foam and Air
37
Tank specs on a CAFS Engine? Water & Foam
750 Gallons of water, 40 Gallons of Class B Foam, 40 Gallons of Class A
38
How long can the air compressor be operated on a CAFS Engine without overheating?
2 hours
39
What does PIERCE recommend as the max size line tk use for CAFS?
250 ft.
40
During Relay operations (Supply) what do you initally charge 4" line at? 3" Line? If a 4" and 3" are together?
50 psi 100 psi 100 psi
41
As a supply pumper DO NOT gate down their?
Discharges
42
Always add ____ psi for residual pressure.
20
43
Friction loss in multiple supply lines: (Coefficents for FL Formula) Two 3" Lines: One 4" and one 3" Line: Two 4" lines:
0. 2 0. 09 0. 05
44
Like Volumes Formula: (SP-RP)×100/SP ``` Percentage Drop: 0-10% __ times available water 11-15% __ times available water 16-25% __ times the original amount Another greaters than 25% Less than original amount ```
3 2 1
45
Standpipe Ops: | After securing water supply, connect one line to FDC and charge to ____?
150 psi
46
Appliance Loss for a standpipe, combination sprinkler system, and master stream?
25 psi
47
Starting pressure for sprinkler system is ____ psi.
150 psi
48
Unlike the standpipe system, if smoke or fire is showing or upon confirmation of a working fire, ________?
Charge the system, standpipe wait for command.
49
Do NOT charge the ladder pipe unless ordered to by?
Truck Driver, Truck Officer, or command
50
Steps to perfrom a draft:
* pick your intake * Ensure pump is air tight, close tank to pump * switch pressure governor to rpm mode * position hard sleeve * increase throttle to 1,000-1,200 rpm * pull primer (no more than 45 seconds) * once pressure develops on master pump gauge, disengage primer, open discharge

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