11 - IFSTA Chapter 11 Flashcards
1
Q
The difference in elevation between the surface of the static water supply and the center of the pump intake is defined as?
A
Lift
2
Q
During the drafting process, how should the intake hose pressure correlate to atmospheric pressure?
A
It must be less than
3
Q
For every 1,000 ft of altitude, how much is the approximate decrease in atmospheric pressure?
A
0.5 psi
4
Q
What is the term referring to the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow?
A
Dependable lift
5
Q
When rating all fire department pumping apparatus, what is the minimum lift generated while drafting from the center of a pump intake to the surface of water?
A
10 ft
6
Q
What devices may draw water as shallow as 1-2 inches?
A
Low-level strainers
7
Q
When drafting from a natural water source, what may be used to support an intake hose and strainer from resting on or near the ground?
A
Ladder
8
Q
What type of hydrants allow for more efficient access to a natural supply source through a pre-piped installation?
A
Dry
9
Q
The formula for determining the capacity of a square/rectangular pool is?
A
C = 7.5 x L x W x D
10
Q
The formula for determining the capacity of a round pool is?
A
C = 7.5 x Pi x r^2 x D
11
Q
When calculating the theoretical lift, what must be done after determining the atmospheric pressure of an area in relation to the water’s pressure per square inch while inside the intake hose?
A
Multiply them
12
Q
After factoring in the surrounding atmospheric pressure and friction loss in the intake hose, how many feet of dependable lift should every properly operating fire pump have?
A
14.7
13
Q
Driver/operators should be able to evaluate conditions that affect static water source accessibility. Which of the following in itself is not a condition for concern?
A
flat water
14
Q
Although it may vary based on atmospheric pressure, how many feet is maximum lift normally?
A
25
15
Q
Since a total vacuum is not attainable using fire department pumpers, this means that pumpers cannot be expected to draft water that is located how many feet below the pumper?
A
33.9
16
Q
Using the formula for determining maximum lift, what is the maximum lift when the intake gauge reads 12 Hg(inches of Mercury)?
A
13.56
17
Q
Regardless of the intake method, what action is required after any pumping operation causing salt or dirty water to be drawn into the pump?
A
Flush with clean, fresh water
18
Q
Which device may be used for water as shallow as one foot?
A
Floating strainer
19
Q
What is the volume capacity of a square/rectangular pool that is 33 feet wide, 110 feet long, and has an average depth of 9 feet?
A
245,025 gallons
20
Q
What is the volume capacity of a round pool that is 25 feet in diameter with an average depth of 8 feet?
A
29,452.43 gallons
21
Q
What is theoretical lift when lifted by atmospheric pressure in a true vacuum ?
A
33.9
22
Q
What is Maximum lift when raised through a section of hard sleeve hose to a pump?
A
25
23
Q
What is dependable lift when friction and pressure loss are added to the suction hose?
A
14.7
24
Q
Which of the following is NOT a problem when determining a static water supply?
A
Hard/Dry Ground
25
Pumpers may not be able to reach the water in all areas regarding drafting operations which of the following is a factor(s)?
All the above
26
Which of the following is the greatest height to which any amount of water may be raised through an intake hose to the pump?
Maximum Lift
27
If water does not rise to the level of the pump intake, drafting:
Will not be possible
28
In general, which of the following is the driver/operator Most concerned with?
Dependable Lift
29
Which of the following must account for all factors that contribute to the amount of work required by a pump to produce a fire stream?
Net pump discharge pressure
30
When evaluating a potential natural water source, what two factors must be considered first?
Adequacy and accessibility
31
Which of the following is most likely to cause a rollover of the fire apparatus?
Operating apparatus on unstable terrain
32
Which of the following is mostly likely to be placed at some natural water sites to create adequate water supply availability?
Dry Hydrants
33
Which of the following is the equation for determining the capacity of a square/rectangular pool?
7.5 x L x W x D
34
Which type of strainer requires 2 feet of water all around the strainer?
Barrel Strainer
35
Which of the following may be used when water is as shallow as 1 foot?
Floating strainer
36
An underground water storage receptable usually found in an area not serviced by a hydrant system is called?
A cistern
37
Which of the following equations determines the capacity of a round pool?
7.5 x 3.14 x r2 x D
38
Water is supplied through open cannels and portable pipes for:
Agricultural irrigation system
39
Connections similar to a dry hydrant for a quick fire department hook-ups may be available on?
Large indoor or outdoor swimming pools
40
Which of the following must be done after salt and dirty water is drawn into the pump?
Pump must be flushed with clean fresh water
41
What is the difference in elevation between the surface of the static water supply and the center of the pump intake?
Lift
42
What is the definition of theoretical lift?
Scientific height that a column of water may be lifted by atmospheric pressure in a true vacuum
43
How many gallons are in one cubic foot?
7.5
44
What is the definition of maximum lift?
maximum height to which any amount of water may be raised through a hard suction hose to a pump
45
Generally, you will be more concerned with a concept that is defined as, "the height a column of water may be lifted in sufficent quantity to provide a reliable fire flow." what is this concept called?
Dependable Lift
46
What must account for all factors that contribute to the amount of work required by a pump to produce a fire stream?
Net Pump Discharge Pressure
47
When considering a major lake or river, what is generally not a major problem?
Adequacy
48
Two feet of water all around is considered the minimum what type of strainer?
Barrel Strainer
49
Which type of strainer may be used for water as shallow as one foot?
Floating Strainer
50
Which type of strainer is most commonly used to draft from a portable water tank?
Low-Level Strainer
51
What is defined as, "cleaning a fire pump or piping by flowing water through it in the opposite direction of normal flow?"
Back flushing
52
What is the formula for calculating the amount of available water from a rectangular or square pool?
Lengt x Width x Average Depth x 7.5
53
What is the formula for calculating the amount of available water from a round pool?
7.5 x π x r² x Average Depth
54
What is the gallonage of a rectangular pool that is 30' long, 15' wide, 3' deep in the shallow end, and 9' deep in the deep end?
20,250 Gallons
55
What is the gallonage of a ciruclar pool that is 100' across and 8' deep?
471,238 Gallons
56
What should be done after drafting from a static water source that is not a draft pit?
Flush the pump with clean water
57
What is the definition of a cistern?
Water storage recepticle that is usually underground and may be supplied by a well or rainwater runoff
58
What is the constant in the pressure correction formula?
2.3
59
What must be attached to all intake hoses when drafting from a natural water supply source?
Strainer
60
What is a major factor in determining the useability of a static water supply source?
Accessibiilty
61
What capacity is a pump with a 20ft lift?
60%
62
What happens to water to water capacity of a pump, as the lift or friction loss in hard intake hose increases
decreases
63
What are some problems that may impede access to drafting?
wet/soft ground/freezing water/inadequate depth
64
What can be used to supply land based pumpers from fresh or salt water?
fire boats
65
What water sources is man made with similar characteristics as a pond or lake?
ground reservoirs
66
What water source has water in open canals and portable pipes?
agricultural irrigation systems
67
what is the formula to find a round pool capacity? (in gallons)
C= 7.5 x 3.14x r^2 xD
68
what is the formula to find a square pool capacity? (in gallons)
C=7.5xLxWxD
69
what water storage is usually underground and supplied by well or rain water?
cisterns
70
What is something all firefighters need to wear working close to water?
personal flotation device
71
what can be used in a small, fast running stream to raise the level of water?
a ladder and salvage cover
72
What is the depth a floating strainer can be used?
1ft
73
What is the maximum height water can be lifted through a hard suction hose to the pump?
25ft
74
what is the formula for determining maximum lift?
L=1.13Hg
75
What is the maximum height a column can be lifted in a draft? (theoretical)
33.9ft
76
What happens if water does not rise to the level of the pump intake while priming?
draft will not happen
77
What is the difference between elevation from the surface of the static water supply to the center of pump intake called?
lift
78
How many feet is “Dependable lift”?
14.7ft
79
What can fire dept do to ensure access to drafting sites?
pre incident planning
80
What is it called when you clean a fire pump or piping by flowing water through it in opposite direction of normal flow?
back flushing
81
This is the difference in elevation between the surface of the static water supply and the center of the pump.
Lift
82
What is the device that exhausts air from an intake hose and fire pump when drafting?
Priming Device
83
The process of creating a pressure difference between the inside of the pump, the intake hose, and the atmosphere is called what?
Priming
84
Because the pressure outside the intake hose is higher than the pressure in the hose, water does what?
Water is forced in until the pressure within the pump equals atmospheric pressure
85
The maximum height of the lift when drafting is affected by what?
The amount of vacuum that the priming device can produce and the existing atmospheric pressure
86
This is the scientific height that a column of water may be lifted by atmospheric pressure in a true vacuum.
Theoretical Lift
87
For every 1,000 feet, atmospheric pressure decreases by approximately how many psi?
0.5 psi
88
What is the height to which any amount of water may be raised through a hard suction in to a pump?
Maximum Lift
89
In most circumstances, what is the maximum lift of a pump?
25 ft
90
Determine the maximum height ot which water will be lifted when the intake gauge reads 10 Hg.
11.3 ft
91
When determining maximum lift, what is the variable L in the maximum lift formula?
Height of lift in feet
92
What is the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow?
Dependable Lift
93
How many feet is dependable lift usually considered to be?
14.7 feet
94
All fire department pumping apparatus are rated when drafting to a minimum of how many feet of lift through 20 feet of hard intake hose?
10 feet
95
All fire department pumping apparatus are rated when drafting with a minimum 10 feet through how many feet of hard intake hose?
20 feet
96
As the lift or friction loss in hard intake hose is increased, the water supply capability of the pump does what?
Decreases
97
Smaller natural water sources are more susceptible to what than large bodies of water?
Fluctuations in adequecy during droughts
98
Which of the following would not negatively affect a DPOs ability to access a natural static water source?
A boat ramp
99
If necessary a DPO can place a floating pump in a water source if they cannot access it with their apparatus. Floating pumps can develop and maintain a flow of up to what?
500 gpm
100
Although lesser depths may be suitable, how much clearance is generally considered the minimum amount for a barrel-type strainer?
24"
101
How does Irrigation system generally supply water?
Via open canals and portable pipes
102
What water system may require special threaded adapters or other tools to operate the system?
Agricultural Irrigation system
103
What is the costumary formula to determine the capacity of a round pool?
C=7.5x3.14xr²xD
104
This type of artificial water source typically contain many millions of gallons of water:
Ground reservoir
105
What are ground reservoirs similar to?
Pond or lake
106
Which type of water source FD may require owner to equip these with appropriate connections?
Private water storage tanks
107
What artificial water source may be stored at ground level or elevated?
Private water storage tanks
108
An underground water storage receptacle that is usually found in areas not serviced by hydrant system is?
Cistern
109
What is a method of gaining access to static water supplies during freezing weather?
Fill barrels with antifreeze
110
What can help to avoid problems with silt and debris?
Install dry hydrants
111
If an adequate draft can't be established due to clogging, What can be done?
Back flush with tank water
112
Which device may draw water as shallow as 1 to 2 inches but will not provide required flow?
Low level strainer
113
What is the minimum depth for a barrel type strainer?
2 fet
114
Which type of deice may be used for water as shallow as 1 foot?
Floating strainers
115
The floating pumps can develop and maitain a flow up to how may gpms?
500gpm
116
When may be necessary to position portable pumps at a supply source?
Fire apparatus can't make the require approach
117
A 1,000gpm pumper operating from draft has a PDP OF 120psi, a lift of 9 feet and a total intake friction loss of 6. What is the NPDP?
126psi
118
What is the customary formula for Pressure correction
PC=Lift+total intake hose friction loss/2.3
119
What is the concept where the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow?
Dependable lift
120
Net pump discharge pressure formula is?
PDP + PC
121
According to theoretical lift what is the maximum height water can be lifted in a true vacuum?
33.9 feet
122
For every 1,000 feet of elevation gain, the atmospheric pressure decreases by approximately how much?
0.5 psi
123
Mximum lift is approximately how many feet?
25 feet
124
Which of the following is not a variable that affects maximum lift
Condition of the engine
125
What is the formula for determining maximum lift?
L = 1.13Hg
126
Dependable lift is usually considered to be how many feet?
14.7
127
What is dependable lift?
Height a column of water may be lifted in sufficient quantity to provide a reliable fire flow
128
All fire department pumping apparatus are rated when drafting a minimum lift of what?
10 feet
129
What is the pressure correction formula?
PC = Lift + Total intake hose friction loss / 2.3
130
What is the formula for Net Pump Discharge Pressure when at a draft?
NPDP(Draft) = PDP + PC
131
Which of the following is not a natural water supply source
Cistern
132
Floating pumps placed in an adequate water source can maintain a flow of up to how many GPM's?
500
133
What depth can floating strainers still be utilized?
1 foot
134
What device can be used to draft water as shallow as 1 to 2 inches?
Low level strainer
135
What is the typical size range for a cistern?
10,000 to 100,000 gallons
136
What is the formula for finding the capacity of a rectangular pool?
C = 7.5 x L x W x D
137
What is the formula for finding the capacity of a round pool?
C = 7.5 x TT x r2 x D
138
Irrigation systems can flow in excess of how many gallons?
1,000 gpm
139
What determines maximum lift?
Ability of the pump to create a vacuum
140
Which of the following is not obtainable using a fire service pumper
Theoretical lift
141
Which of the following options is not considered to be a static water source?
On board water
142
How is "lift" measured in regards to static water sources?
The elevation difference between the surface of the static water supply and the center of the pump intake
143
What must be completed in order for an engine company to establish a draft?
air must be exhausted from the intake hose and fire pump
144
The pressure difference between the intake hose and normal atmospheric pressure is :
lower
145
According to the principles of theoretical lift for every 1000 feet in elevation above sea level, atmospheric pressure:
decreases by .5 psi
146
The maximum lift achievable by fire apparatus is approximately:
25 feet
147
The result of water being forced into the hose and pump during drafting operations is due to the pumps ability to:
create a partial vacuum
148
Every fire pump that is operating properly should have a dependable lift of at least:
14.7 feet
149
How is theoretical lift calculated?
atmospheric pressure X water pressure (per square foot kPa)
150
What is the minim depth needed to rate drafting capabilities of fire department apparatus?
3 feet
151
What is the minim depth a barrel strainer be submerged in order to operate?
2 feet
152
Which lift variant should the driver/operator be more concerned with?
dependable lift
153
Which of the following static water supply sources is the largest?
ground reservoir
154
A typical residential swimming pool typically:
supplies enough water for a fire in a single family dwelling
155
How is the capacity of a swimming pool determined?
7.5 X L X W X D
156
Which of the following water systems is supplied by using open canals and portable pipes?
agricultural irrigation systems
157
What is the total pump capacity If the lift used during drafting is increased to 15 feet?
70 percent
158
What is the total pump capacity If the lift used during drafting is increased to 20 feet?
60 percent
159
How is the vacuum reading measured on the intake gauge?
inches of mercury
160
Which of the following is the maximum theoretical lift at which pumpers cannot be expected to draft water?
33.9 feet
161
Agricultural systems can flow in excess of how many gpms?
1,000 gpm
162
What is the formula to determine the capacity of a round pool?
C = 7.5 x TT x r2 x D
163
What is the formula to determine the capacity of a rectangular pool?
C = 7.5 x L x W x D
164
What type of water storage receptacle is usually underground and can be supplied by rainwater runoff?
Cistern
165
Cisterns can vary in size, but typically range between how many gallons?
10,000 to 100,000 gallons
166
What do you do to back flush a fire pump?
Flow water in the opposite direction of normal flow
167
Which of the following is NOT an artifical static water supply source?
Water tower
168
When drafting from a natural water supply source, what is important for all intake hoses to have?
Strainer
169
What is the minimum depth of water that is needed all around a barrel strainer?
2 feet
170
Low level strainers can draw water from as shallow as what depth?
1 to 2 inches
171
Floating pumps placed in an adequate water source can maintain flows of up to how many gpms?
500 gpm
172
What is a major determining factor in the usability of a static water supply source?
Ability of apparatus to access and set up effective drafting operation
173
What is the pressure correction formula?
PC = Lift + Total intake hose friction loss / 2.3
174
When at draft net pump discharge pressure is the sum of what?
Pump discharge pressure and intake pressure correction
175
All fire department pumping apparatus are rated when drafting a minimum lift of what from the center of the pump?
10 feet
176
Every fire pump that is operating properly should have a dependable lift of at least what?
14.7 feet
177
What is the formula for determining maximum lift?
L = 1.13Hg
178
Maximum lift is approximately what?
25 feet
179
Pumpers can not expect to draft water that is located what distance below the pump?
33.9 feet
180
For every 1,000 feet of altitude atmospheric pressures decreases approximately how many psi?
0.5 psi
181
What is the difference in elevation between the surface of the static water supply and the center of the pump intake called?
Lift
182
What would decrease as altitude above sea level increases?
Theoretical lift
183
For every 1,000 feet of altitude, the atmospheric pressure decreases by approximately how much?
0.5 PSI
184
What is defined as the greatest height to which any amount of water may be raised through an intake hose to the pump called?
Maximum lift
185
In most circumstances, maximum lift is approxamately what?
25 feet
186
What is the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow called?
Dependable lift
187
Every fire pump that is operating properly should have a dependable lift of at least what?
14.7 feet
188
All fire department pumping apparatus are rated when drafting with a minimum lift of what from the center of a pump intake to the surface of water through 20 feet of hard intake hose?
3 feet
189
Natural static water supply sources include everything except what?
Quarry
190
A major factor in determining the usability of a static water supply source is the ability of fire apparatus to what?
Set up an effective drafting operation at the site
191
Fire departments can ensure access at particular sites by doing what?
Using preincident planning
192
Floating pumps placed in an adequate water source can develop and maintain a flow of up to what?
500 GPM
193
Cleaning a fire pump or piping by flowing water through it in the opposite direction of normal flow is called what?
Back flushing
194
Floating strainers may be used for water as shallow as what?
12 inches
195
What type of hydrant are at predertimed static water supply sources and may help expedite drafting operations?
Dry
196
Driver/operators should take precautions so that intake strainers do not what?
Come in contact with the bottom of the water source
197
Firefighters should maintain situational awareness when preforming what?
Ice cutting operations
198
What is a water storage receptacle that is usually underground and may be supplied by a well or rainwater shutoff.
Cistern
199
Some pools may be difficult to use due to what?
Backyard location / Fence
200
Agricultural irrigation systems in some jurisdictions may flow in excess of what?
1,000 GPM
201
What is the difference in elevation between the surface of the static water supply and the center of the pump intake called?
Lift
202
What happens to the pressure in the hose and in the pump when drafting?
Drops lower that the atmosferic pressure
203
What affects the maximum height of the lift?
Amout of negative pressure
204
For every 1,000 feet of altitude, what psi does the atmospheric pressure decreases?
.5 psi
205
What is the theoretical lift when a true vacuum is achieved?
33.9 feet
206
This is defined as the greatest height to which any amount of water may be raised through an intake?
Maximum lift
207
Which is the approximate maximum lift in most cases?
25 feet
208
Which formula represents L=1.13 Hg?
Maximum lift
209
How deep is a strainer submerged in a water depth of at least 4 feet?
2 feet
210
What is dependable lift?
14.7 eet
211
Choose the most accurate about, all pumping apparatus are rated when drafting with a minimum of:
10' of lift and 20' of hard intake hose
212
What most account for all factors to contribute the amount of work required by a pump to produce a fire sttream?
Net pump discharge pressure
213
This formula, =lift+total intake hose friction loss/2.3 is used to detemine what?
Pressure correction
214
When evaluating a potential water supply source, what needs to be determined first?
Adequacy and accessibility
215
What should a driver be aware of about small natural sources compared to larger ones?
Periods of drought
216
How can fire departments ensure access at particular sites?
By using preincident planning
217
What do some jurisdictions use to allow the utilization of static water supplies that are located a modest distance?
Water eductors
218
What is the ideal position for a strainer when securing at the bottom of water source?
Horizontally to bottom of water source
219
What may restrict the volume of water to draft, but allow for better access to a natural supply source?
Dry hydrants
220
What makes difficult to keep a strainer submerged ?
Strong currents
221
What is the difference in elevation between the surface of the static water supply and the center of the pump intake?
Lift
222
According to theoretical lift, for every 1,000 feet of altitude, the atmospheric pressure decreases by approximately how much?
.5 psi
223
What is defined as the greatest height to which any amount of water may be raisd through an intake hose to the pump?
Maximum lift
224
Which of the following is not a variable affecting maximum lift?
Water depth
225
In most circumstances, what is the approximate maximum lift?
25 feet
226
What is the term for the height a column of water may be liftd in sufficient quantity to provide a reliable fire flow?
Dependable lift
227
What is the minimum lift for a fire department pumper when being rated when drafting?
10 feet
228
How much water needs to surround a strainer submerged in water when apparatus is being rated at draft?
2 feet
229
Lakes, ponds, streams, rivers and oceans are what kind of water source?
Natural static water supply
230
Floating pumps placed in an adequate water source can develop and maintain a flow of up to how much GPM?
500 GPM
231
What uncommon type of fire apparatus can be used to supply land based pumpers from fresh or salt water sources?
Fire boat
232
How much water is generally considered the minimum water all around barrel-type strainers?
2 feet
233
Floating strainers may be used for water as shallow as?
1 foot
234
Low-level strainers are most commonly used to draft from portable water tanks and my draw water as shallow as?
1 to 2 inches
235
What is the term describing cleaning a fire pump or piping by flowing water through it in the opposite direction of normal flow?
Back flushing
236
If an adequate draft cannot be established due to clogging at the strainer, what could be done to help dislodge the debris?
Back flushing
237
What is an underground water storage receptacle that is usually found in no hydrant areas and recieves thier water from a well or rainwater runoff?
Cistern
238
What is the formula to determine the capacity of a square/rectangular water source such as a pool?
7.5 x L x W x D
239
What is the formula to determine the capacity of a cylindrical container or round pool?
7.5 x 3.14 x R^2 x D
240
After factoring surrounding atmospheric pressure and friction loss in the intake hose, every fire pump that is operating properly should have a dependable lift of at least how much?
14.7 feet
241
Which of the following is the level at which pumpers cannot be expected to draft water?
33.9
242
Which of the following is closest to decribe maximum lfit in most situations?
25
243
What is dependable lift when friction and pressure loss are added to the suction hose?
14.7
244
Which of the following is NOT a problem when determining a static water supply?
Hard/Dry Ground
245
Pumpers may not be able to reach the water in all areas regarding drafting operations which of the following is a factor(s)?
All the above
246
Which of the following is the greatest height to which any amount of water may be raised through an intake hose to the pump?
Maximum Lift
247
If water does not rise to the level of the pump intake, drafting:
Will not be possible
248
In general, which of the following is the driver/operator Most concerned with?
Dependable Lift
249
Which of the following must account for all factors that contribute to the amount of work required by a pump to produce a fire stream?
Net pump discharge pressure
250
When evaluating a potential natural water source, what two factors must be considered first?
Adequacy and accessibility
251
Which of the following is most likely to cause a rollover of the fire apparatus?
Operating apparatus on unstable terrain
252
Which of the following is mostly likely to be placed at some natural water sites to create adequate water supply availability?
Dry Hydrants
253
Which of the following is the equation for determining the capacity of a square/rectangular pool?
7.5 x L x W x D
254
Which type of strainer requires 2 feet of water all around the strainer?
Barrel Strainer
255
Which of the following may be used when water is as shallow as 1 foot?
Floating strainer
256
An underground water storage receptable usually found in an area not serviced by a hydrant system is called?
A cistern
257
Which of the following equations determines the capacity of a round pool?
7.5 x 3.14 x r2 x D
258
Water is supplied through open cannels and portable pipes for:
Agricultural irrigation system
259
Connections similar to a dry hydrant for a quick fire department hook-ups may be available on?
Large indoor or outdoor swimming pools
260
Which of the following must be done after salt and dirty water is drawn into the pump?
Pump must be flushed with clean fresh water
261
is the difference in elevation between the surface of the static water supply and the center of the pump intake
Lift
262
The maximum height of the lift is affected by
the length of the intake hose
263
The maximum height of the lift is affected by
by the amount of negative pressure (vacuum) that the priming device can produce
264
The maximum height of the lift is affected by
the existing atmospheric pressure
265
Scientific height that a column of water may be lifted by atmospheric pressure in a true vacuum.
Theoretical lift
266
Can be calculated by determining the atmospheric pressure of an area and multiplying that number by the water’s pressure per square inch (kPa) while it is in the intake hose.
Theoretical lift
267
the greatest height to which any amount of water may be raised through an intake hose to the pump.
Maximum lift
268
Maximum Lift (Customary)
L= 1.13 Hg
269
Maximum Lift (Metric)
L= 0.01356 Hg
270
Height a column of water may be lifted in sufficient quantity to provide a reliable fire flow
Dependable lift
271
After factoring in the surrounding atmospheric pressure and friction loss in the intake hose, every fire pump that is operating properly should have a dependable lift of at least
14.7 feet
272
must account for all factors that contribute to the amount of work required by a pump to produce a fire stream
Net pump discharge pressure
273
PC =
| Lift + Total Intake Hose Friction Loss/2.3
(Customary) Pressure Correction
274
PC =
| Lift + Total Intake Hose Friction Loss/0.1
(Metric): Pressure Correction
275
NPDPDraft = PDP + PC
(Customary and Metric): Net Pump Discharge Pressure at Draft
276
When evaluating a potential water supply source, first determine its
adequacy and accessibility
277
Floating pumps placed in an adequate water source can develop and maintain a flow of up to
500 gpm
278
How many feet of water all around a barrel-type strainer is generally considered the minimum for that type of equipment?
2 ft
279
Floating strainers may be used for water as shallow as
1 ft
280
These devices may draw water as shallow as 1 to 2 inches (
Low-level strainers
281
Lift is the difference between?
The surface of the water and the center of the pump.
282
What happens to the inside of the pump and the intake hose during drafting?
Lower atmospheric pressure.
283
The theoretical scientific height that a Colum of water may be lifted by atmospheric pressure in a true vacuum at sea level is?
33.9'
284
For every 100 feet in elevation how much atmospheric pressure is lost?
0.5 PSI
285
In most circumstances, maximum lift is approximately how many feet?
25
286
The height to which any amount of water may be raised through a hard suction hose to a pump; determined by the ability of the pump to create a vacuum is called?
Maximum lift
287
Dependable lift is usually considered to be what?
14.7 feet
288
All fire department pumping apparatus are rated when drafting with a maximum height of?
10 feet
289
What is dependable lift considered to be?
14.7 feet
290
To clean a fire pump or piping by flowing water in the opposite direction is called?
Back flushing
291
A water storage receptacle usually underground supplied by rain or well is called?
Cistern
292
Why dose the strainer need to be 24" away from all surfaces?
Silt, air, water debris
293
This is installed in rural area's in a static water supply. It should be inspected yearly.
Dry hydrant
294
When working in close proximity to water, firefighters must have what?
Personal floatation devises and safety line
295
Cisterns, private water storage, ground reservoirs, swimming pools are all examples of what?
Artificial static water supply's
296
What is a concern with private water storage tanks?
There availability when needed
297
Drivers should be aware of what in regards to responsibility's for dry hydrants maintained?
Policy's
298
In the formula for square/rectangular capacity's what does the 7.5 represent?
Gallons per cubic foot
299
When looking at depth of a pool, what is used for that number?
Average depth
300
When done drafting from a swimming pool, why must the pump and piping be flushed?
Chlorine residual
