1 Flashcards
1
Q
One cubic foot contains…….inches
A
1728 cubic inches
2
Q
One cubic foot contains……..gallons
A
7.5
3
Q
One cubic foot of fresh water weighs…….pounds
A
62.5
4
Q
One gallon contains………….. cubic inches
A
231
5
Q
One gallon of fresh water weighs
A
8.33 pounds
6
Q
A column of water 1’ high exerts a pressure of …………… at its base
A
O.434 psi
7
Q
A column of water 2.304’ high exerts a pressure of………… at its base
A
1 psi
8
Q
50’ length of 1.75” hose contains……..of gallons of water
A
6.24
9
Q
50’ length of 1.88” hose contains…………..gallons of water
A
7.20
10
Q
50’ length of 2.5” hose contains…………gallons of water
A
12.74
11
Q
50” length of 3” hose contains…………gallons of water
A
18.35
12
Q
100’ length of 4” hose………… gallons of water
A
65.25
13
Q
100’ length of 5” hose contains…………… gallons of water
A
101.94
14
Q
Nozzle pressure for hand lines with smooth bore nozzles
A
50 psi, can be increased to 65 psi to achieve higher flow
15
Q
Nozzle pressure for master stream with smooth bore nozzles
A
80 psi, can be increased to 100 to achieve higher flow
16
Q
Akron assault nozzles are designed to flow……… at what psi………
A
175 GPM at 50 psi
15/16” slug flows 185 GPM at 50 psi
17
Q
Nozzle pressure for all other fog nozzles
A
100 psi
18
Q
Formula for determine volume for a rectangular or square shaped container
A
LxWxDx 7.5(number of gallon in a cubic foot)
LxWx average depth x 7.5 Average depth ( a+a)/2
19
Q
Formula to determine the volume of a cylinder, pipe, or hose
A
3.14 x r squared x H (or L) x7.5
20
Q
Smooth bore nozzle discharge formula
A
29.7 x d squared x square root nozzle pressure
21
Q
1/2” tip for a hand-line @ 50psi
A
Theoretical =53
Foreground =50
22
Q
7/8” tip for hand line @ 50 psi
A
Theoretical = 161
Fireground= 150
23
Q
15/16” tip for a hand line @ 50psi
A
Theoretical = 185
Fireground= 185
24
Q
1” tip for hand line @ 50psi
A
Theoretical = 210
Fireground = 200
25
1 1/8” tip for a hand line @ 50 psi
Theoretical =266
Fireground = 250
26
1 1/4 tip for hand line @ 50 psi
Theoretical =328
Fireground= 325
27
1 1/4 tip for master stream @ 80psi
Theoretical =415
Fireground = 400
28
1 3/8” tip for a master stream@ 80 psi
Theoretical =502
| Fireground = 500
29
1 1/2” tip for master stream @ 80psi
Theoretical =598
Fireground= 600
30
1 3/4” tip for master stream @ 80 psi
Theoretical =814
Fireground= 800
31
2” tip for master stream @ 80 psi
Theoretical = 1062
Fireground= 1000
32
1” adjustable gallonage fog nozzle is an adjustable flow nozzle that delivers
12-60 GPM
33
1 1/2” Akron assault nozzle flows
175 GPM
34
2 1/2” Akron assault nozzle is an adjustable flow nozzle that can deliver
125-250 GPM
35
Master stream fog nozzles have an operating range of
150-2000 GPM
36
Usually are 150’ long, can flow between 12-60gpm with 100 psi nozzle pressure
Booster reels
37
1” forestry hose
Comes in 50’ and 100’ sections
Flows between 12- 60 GPM
Red fog nozzles flows 22 gpm
Used at 100 psi
38
Decon shower
270 GPM at 75 psi
39
Piercing nozzle
Flows 125 GPM at 100 psi
40
Distributer nozzle
2 1/2” flows 250 GPM at 100 psi
1 1/2” flows 95. GPM at 50 psi
41
Cellar nozzle
2 1/2” flows 350 GPM at 100 psi
1 1/2 flows 160 GPM at 100 psi
42
Three different types of monitors used in Fairfax county
Fixed- permanently attached to the pumper
Portable- mercury monitor
Combination- fixed to engines but can be removed and connected to a ground mount
Smooth bore nozzle flows between
500-1000gpm at 80 psi
Fog nozzle flows between 350-1250 at 100psi
43
Smooth bore break away nozzle
Tip 1 3/8 1 1/2 1 3/4 2
Flow 500 600 800 1000
Psi 110 110 110 120i
Flows between 500-1000 GPM
44
Task force tip automatic nozzle
Flows between 150- 1250 GPM
Flow 500 750 1000 1250
Psi 90 110 120 140
45
Akron adjustable flow nozzle
Flows between 500- 1250 GPM
Flow 500 750 1000 1250
Psi 100 110 130 140
46
Nozzle pressure for hand lines with smooth bore nozzles
50 psi, can be increased to 65 psi to achieve higher flow
47
Nozzle pressure for master stream with smooth bore nozzles
80 psi, can be increased to 100 to achieve higher flow
48
Akron assault nozzles are designed to flow......... at what psi.........
175 GPM at 50 psi
15/16” slug flows 185 GPM at 50 psi
49
Nozzle pressure for all other fog nozzles
100 psi
50
Formula for determine volume for a rectangular or square shaped container
LxWxDx 7.5(number of gallon in a cubic foot)
```
LxWx average depth x 7.5
Average depth ( a+a)/2
```
51
Formula to determine the volume of a cylinder, pipe, or hose
3.14 x r squared x H (or L) x7.5
52
Smooth bore nozzle discharge
29.7 x d squared x square root nozzle pressure
53
1/2” tip for a hand-line @ 50psi
Theoretical =53
Foreground =50
54
7/8” tip for hand line @ 50 psi
Theoretical = 161
Fireground= 150
55
15/16” tip for a hand line @ 50psi
Theoretical = 185
Fireground= 185
56
1” tip for hand line @ 50psi
Theoretical = 210
Fireground = 200
57
1 1/8” tip for a hand line @ 50 psi
Theoretical =266
Fireground = 250
58
1 1/4 tip for hand line @ 50 psi
Theoretical =328
Fireground= 325
59
1 1/4 tip for master stream @ 80psi
Theoretical =415
Fireground = 400
60
1 3/8” tip for a master stream@ 80 psi
Theoretical =502
| Fireground = 500
61
1 1/2” tip for master stream @ 80psi
Theoretical =598
Fireground= 600
62
1 3/4” tip for master stream @ 80 psi
Theoretical =814
Fireground= 800
63
2” tip for master stream @ 80 psi
Theoretical = 1062
Fireground= 1000
64
1” adjustable gallonage fog nozzle is an adjustable flow nozzle that delivers
12-60 GPM
65
1 1/2” Akron assault nozzle flows
175 GPM
66
2 1/2” Akron assault nozzle is an adjustable flow nozzle that can deliver
125-250 GPM
67
Master stream fog nozzles have an operating range of
150-2000 GPM
68
Usually are 150’ long, can flow between 12-60gpm with 100 psi nozzle pressure
Booster reels
69
1” forestry hose
Comes in 50’ and 100’ sections
Flows between 12- 60 GPM
Red fog nozzles flows 22 gpm
Used at 100 psi
70
Decon shower
270 GPM at 75 psi
71
Piercing nozzle
Flows 125 GPM at 100 psi
72
Distributer nozzle
2 1/2” flows 250 GPM at 100 psi
1 1/2” flows 95. GPM at 50 psi
73
Cellar nozzle
2 1/2” flows 350 GPM at 100 psi
1 1/2 flows 160 GPM at 100 psi
74
Three different types of monitors used in Fairfax county
Fixed- permanently attached to the pumper
Portable- mercury monitor
Combination- fixed to engines but can be removed and connected to a ground mount
Smooth bore nozzle flows between
500-1000gpm at 80 psi
Fog nozzle flows between 350-1250 at 100psi
75
Smooth bore break away nozzle
Tip 1 3/8 1 1/2 1 3/4 2
Flow 500 600 800 1000
Psi 110 110 110 120i
Flows between 500-1000 GPM
76
Task force tip automatic nozzle
Flows between 150- 1250 GPM
Flow 500 750 1000 1250
Psi 90 110 120 140
77
Akron adjustable flow nozzle
Flows between 500- 1250 GPM
Flow 500 750 1000 1250
Psi 100 110 130 140
78
All variables being the same, friction loss will vary directly with the length of hose or pipe. Example: 2 1/2 “ line stretching 100’ long, flowing 250 gpm will have a friction loss of 25 psi. The same line extended an additional 100’ will have a friction loss of 50psi.
1st principle
79
All variables the same,the friction loss varies approximately with the square of the increase in the velocity of flow. If the flow rate is doubled the friction loss will be four times greater
2nd principle
80
When the flow remains constant the friction loss in a hose will decrease when the diameter of the hose is increased.mathematically, friction loss varies inversely to the 5th power as the diameter of the hose.
3rd principle
81
For any given flow velocity, friction loss is independent of pressure. The velocity of water through a hose line, not pressure, causes friction loss.
4th principle
82
Friction loss coefficient for 1”
150
83
Coefficient for 1 3/4”
10 FFX County, 15.5 ifsta
84
Coefficient for 2”
8
85
Coefficient for 2 1/2”
2
86
Coefficient for 3”
0.8
87
Coefficient for 3 1/2”
0.34
88
Coefficient for 4”
0.2
89
Coefficient for 5”
0.08
90
Formula for calculating friction loss
FL= C x Qsquared x L
91
Less than 350 GPM, appliance loss is
0
92
Over 350 GPM, appliance loss is
10
93
Appliance loss in ladder pipes
25 psi
94
Appliance loss in master streams, except mercury monitor
25 psi
95
Appliance loss in standpipes
25 psi
96
A column of water at a height of 10’ will exert a pressure of
4.34 psi
97
Basic pump operators formula
PDP= NP+TPL
TPL = FL+ AL+ EP
98
National foam JS-10 nozzle
Has a rating of 100 GPM at 100psi at the tip
Must be fully open or closed
Not equipped with bale
99
Fairfax County Portable Foam Eductor
Flow 95 to 125 GPM with discharge pressure of 200psi at eductor
Must be placed 50’ from pump panel and within 200’ of nozzle
Nozzle should be no higher than 5 above pump panel
100
Is a bypass proportioning system. An in-line eductor pre-piped into the front bumper discharge.
Line must be pumped 200 psi at the eductor
Akron truck mount foam system
101
System allows foam solution to flow from all discharges
Intake pressure should not exceed 10 psi
If pumper is equipped with direct tank fill, use that connection
Waterous around the pump proportioner
102
Is an electronic direct injection foam system that injects foam into the front bumper discharge
Capable of injecting 0.1% to 3% with a rated capacity of 3gpm of foam concentrate at 150 psi
Husky foam system
103
All Fairfax County pumpers carry a minimum of
40 gallons of foam
104
County CAFS pumpers each hold
```
750 gallons of water
40 gallons of class B foam
40 gallons of class A foam
```
105
CAFS for fire attack
Application consist of 2/3 water and 1/3 air with a foam application rate 0.3%
106
CAFS for overhaul and exposure protection
Application consists of 2/3 air and 1/3 water with a class A foam application rate of0.5%
107
Amount of water required to create an effective stream is decreased by
25%
108
Pierce recommends that CAFS only be used in line up to......... in length for maximum effectiveness
250’
109
Relays are defined as
Two or more pumpers that are in line between water source and the nozzle
110
4” supply lines should be charged to what initially
50 psi
111
3” supply lines should be charged to what initially
100 psi
112
If 4” and 3” supply line are used together, they should be charged to
100 psi
113
Fairfax County pumpers are rated at
1500 GPM at 150 psi pump pressure
114
If pump pressure is increased to 200 psi, the maximum flow decreases to
1050 GPM
115
Maximum flow from a pressurized water source
Incoming static pressure + 150 psi
Pump is able to pump 100% of its rated capacity as long as water source can supply it
116
Friction loss in multiple supply lines
Two 3” line = 0.2
One 4” and one 3” line = 0.09
Two 4” lines= 0.05
117
Like volumes
0-10% = 3 times original amount
11-15%= 2 times original amount
16-25%= 1 times original amount
Greater than 25= less than one of the original amount
SP-RP x 100 / SP
118
Starting PDP for sprinkler systems
150 psi
119
Charge sprinkler systems when there is.................. or ..............
Smoke or fire showing, upon confirmation of a working fire
120
Combination systems should be considered as a standpipe and ..........., start pressure is..........
Charged immediately upon arrival on scene without orders, 150 psi
121
Aerial devices should be supplied with their own ...... if possible
Pumpers
122
What should be used to supply the aerial device
Minimum of one LDH or two 3” supply line
123
Starting pressure for aerial device
150 psi
124
Nozzle reaction for smooth bore
1.57 xD2 xNP
125
Nozzle reaction for a fog nozzle
.0505 xQ x square root of NP
126
Maximum flows that can be expected from a pumper at draft using the following inlets to the pump
Side intake= 1750 GPM
Rear intake= 1500-1750 GPM
Front intake= 900 GPM
127
When I coming pressure exceeds ........., the pump shall be operated in pump gear
50 psi
128
Operate on the principle of diverting the excess water back to the intake side of the pump or on the ground
Relief valves
129
If pump pressure is increased to 250 psi the maximum flow decreases to
750 GPM
