Tanks Flashcards
1
Q
Water tanks are constructed of
A
-Steel
-wood
-concrete
-embankment supported rubberized fabric
2
Q
Elevated wood and steel tanks are supported on
A
Steel or reinforced concrete towers
3
Q
What tanks have become less common in fire protection
A
Elevated tanks
4
Q
What tanks have become more common in fire protection
A
Ground level suction tanks, combined with fire pumps
5
Q
Tanks are primarily used to
A
Supplement public water supplies
6
Q
What tanks are used to provide water directly to sprinkler system
A
Elevated gravity tanks
7
Q
Steel Gravity tanks hold how many gallons
A
5,000 to 500,000
8
Q
Wood gravity tanks hold how many gallons
A
5,000 to 100,000 gallons
9
Q
Steel and wooden gravity tanks are generally erected how high
A
75-150 feet
10
Q
Embankment supported fabric tanks capacity
A
100,000 to 1,000,000 gallons
11
Q
Suctions tanks are installed at
A
Ground level to provide water for fire pump installations
12
Q
Steel pressure tanks rarely hold more then
A
9,000 gallons
13
Q
What type of tank furnishes the primary water supply to sprinklers where there is no suitable water supply and gravity tanks can’t be used
A
Pressure tanks
14
Q
What tank is used as a primary supply in light hazard occupancy’s that are remote
A
Pressure tanks
15
Q
Why should wood tanks be put into service promptly after install
A
May shrink if left empty
16
Q
The discharge pipe must be what kind of pipe
A
Flanged cast iron or steel pipe, welded steel or listed corrosion resistant material with flanged or welded connections
17
Q
Three limitations on steel pipe in contact with storage water is
A
1) 6” or larger: Standard wall pipe (SCH 40)
2) 2” to 5”: Extra heavy pipe (SCH 80)
3) Less then 2 inch: not permitted
18
Q
Riser piping must be installed according to
A
Formed Settling basin
19
Q
Minimum depth required for basin in Flat bottom tank
A
4 inches
20
Q
Minimum depth required for basin in suspended bottom tank
A
18 inches
21
Q
Minimum depth required for base of a large steel plate riser
A
36 inches
22
Q
Swing joints in the discharge pipe are for
A
Expansion
23
Q
Concrete tanks have a capacity of
A
10,000 - 1,000,000 gal
24
Q
What is required on all tanks
A
Water level gauge
25
What were the original method of water level gauges
Mercury gauges
26
Discharge pipe is what size on gravity tanks
Sized by hydraulic design and no less then 6”
27
Check valve in discharge pipe on tank is installed in what orientation
Horizontal
28
Check valve in discharge pipe on gravity tank is installed where
In valve pit below tank
29
Where must control valves be installed
Each side of discharge check
30
All tanks must be capable of being filled in
8 hours
31
Tank water level must never be more then ____ below full line
4 inches
32
2 methods of filling gravity tanks are
Bypass around check
Separate filling pump
33
Minimum size bypass around check
2” minimum
34
Minimum size pipe from separate filling pump
2” min
35
Roof vents are required with
Air tight steel roofs
36
Roof vent size
1/2 the area of the discharge or fill pipe whichever is greater
37
Roof vents require a
Screen
38
What cannot be used as a roof vent
Overflow
39
Overflow size
1 pipe size larger then fill pipe but not less then 3”
40
Where is the inlet to the overflow
Top capacity line of tank
41
Inlet to over flow has what on it
Concentric reducer 2” larger then fill pipe
42
Min size tank drain
2”
43
What’s required to automatically drain trapped sections
1/2 ball drip
44
What is put on drain outside
2-1/2” hose connection
45
Minimum water tank temp
42F
46
Water temp switch will send supervisory signal when temp is at
40F
47
Low water level will send supervisory signal when water level is
12” below normal water level
48
2 kinds of gravity tanks are
Pedesphere & Double Ellipsoidal
49
Where is the discharge pipe located in pedesphere tank
Inside the pedestal and extends from the ground up into the tank
50
Pedesphere has what kind of bottom
Suspended bottom
51
Where are manholes located in Pedesphere tank
2 on extreme top
1 on bottom for clean out
52
Each tower needs its own
Valve pit/house
53
What is the clearance around around all equipment in valve house
12”
54
Valve house must be maintained at what temp
42F
55
Most common gravity tank in use is
Double ellipsoidal
56
What eliminates the need for a frost proof casing, insulation, and an expansion joint
3 foot riser from the foundation to the bottom of the tank
57
How is discharge pipe protected from debris
Flanged tee on top (horizontal outlets are made one size smaller)
58
Gravity tanks are usually how far up to fill line
100 ft
59
Min pressure required to fill gravity tank 100’ up
50 psi
60
What can be used to help fill
Fire pump or separate filling pump
61
Overflow pipe is usually what size
3”
62
Tank is drained by
2” outlet at the bottom of the discharge piping near or on base elbow
63
Where is thermometer installed in addition to low temp switch
Cold water return line
64
Tank manufacturer is responsible for
Painting and installing lightning arrestors
65
Discharge pipe in Pedesphere is generally
8” steel piping
66
Roof styles for ground storage tanks are
Concial, dome or ellipsoidal
67
Most ground storage tanks are
Welded
68
Ground storage tanks require coating
On the bottom
69
2 kids of coatings on ground storage tanks are
-2 coats of paint on bottom
-Oil saturated sand cushion
70
Oil saturated sand cushion is saturated to a depth of what (ground storage tanks)
Depth of 3” with heavy petroleum based oil
71
Do not attempt any repairs on tank unless water is
2 feet below repair
72
Ground storage tank is placed on
Concrete ring wall
73
Concrete ring wall for ground storage tanks is how thick
At least 10” thick and extends 6” to 12” above grade
74
All concrete shall have a compressive strength of
3000psi
75
Inner part of concrete ring foundation filled with
Crushed stone or granular base at least 3” mixed w/ oil and laid on grade
76
Immersed steam coils are made of
1 1/4” brass or copper
2” steel pipe
77
Min pressure in immersed steam coils is
10psi
78
Reservoirs are usually put up where
Just above or below grade
79
Reservoirs have how much head pressure
Minimal
80
Reservoirs are generally used for
Fire pump suction water supply
81
Embankment support rubberized tank is a
Collapsible container, lightweight, and durable
82
Embankment support rubberized tank is made of
Rubber coated fabric
83
Pressure tanks are best installed
Top of buildings (above piping they are supplying)
84
Most common size of pressure tanks are
6000-9000 gal
85
Pressure tanks usually operate at
125psi
86
Pressure tanks installation clearances
-Non combustible areas at least 3ft from the floor
-18” clearance is required around all parts of tank
87
Pressure tank water supply pipe min size
1 1/2” (preferred non corrosive)
88
Water fill pump for pressure reservoir must be capable of delivering
65gpm against operating pressure
89
Must be able to fill pressure tank within how long
4 hours
90
Water supply (filling pump) in pressure tank requires a relief valve
-1 1/2” in size
-Brass
-set to keep pressure from rising 10% above the pressure existing at its location
91
Air compressor must have a capacity of (7500 gal tanks and less)
16 C.F.M
92
Min discharge pressure for air compressor
5 psi
93
Air compressor must have a capacity of (tanks with more turn 7500 gal)
20 C.F.M
94
Airline piping shall be a minimum size of
1”
95
Relief valve for air compressor on pressure tanks is
3/4” brass set to 10% above operating pressure
96
Discharge pipe in pressure tank is how far from bottom
2” from bottom of tank
97
Pressure tank minimum discharge pipe size
4”
98
Minimum drain size for pressure tanks
1 1/2”
99
Air pressure gauge on pressure tank min size and kind
4 1/2” double spring gauge
100
Rang of pressure gauge on pressure tank
2x pressure working against it
101
Size of water level gauge in pressure tank
3/4”
102
Nameplate on pressure tank should indicate
-air operating pressure
-name and address of manufacturer
-year tank was made
-length and diameter
-total capacity
-max permitted water pressure
103
Pressure tanks should be painted with
2 costs of metal protective paint
104
Pressure tanks are generally kept how full
2/3 of water
1/3 of air
105
Pressure tanks are designed to have how much air left
15psi of air left after water has discharged
106
What is used to control water flow in a pressure tank
Globe valve with renewable disc and a Swing check valve
107
Rules for steel plate on discharge pipe
-Extends at least 4 inches beyond the outside diameter of the pipe
-Clearance of at least 6 inches must be provided between all portions of the flanges
108
After the base of a steel plate riser is in its final position what is done
Grouted
109
When can a pipe riser be rigidly connected
When the distance between the tank bottom and the base elbow or supporting hanger is less then 30ft
110
Tanks with flanged or welded pipe risers 12 inch or less have what
Approved expansion joint
111
Packing in expansion joint consists of
Asbestos wicking saturated with rape oil and graphite
112
Packing in packing space must be
At least 2” deep, 1/2” thick
113
Discharge pipe must be supported by
Double flanged base elbow resting on concrete or masonry
114
What is needed if discharge pipe is 30ft or more
Four elbow swing joint
115
An offset must be supported at
-offsetting elbows
-not over 12’ apart
116
When a tank is used as a suction source for a fire pump what must be equipped on discharge outlet
Vortex plate
117
Size of vortex plate
-At least 2x the diameter of the outlet on elbow fitting from tank wall
-1/2 diameter out of outlet =
Distance above bottom of tank (never less then 6”)
118
When overflow can’t be stubbed outside, where does it go
Down through the tank bottom and inside a frost proof casing or steel plate riser
119
If overflow is in tank, what kind of pipe is it required to be
Brass, flanged cast iron, or steel
120
Bracing on inside overflow pipe cannot be more then how far apart
25 feet
121
If over flow discharge is exposed, the exposed length must not exceed
4 feet and avoid the entrance of the valve pit or house
122
What is provided in the saucer plate, outside the frost proof casing at the bottom of an elevated steel tank w/ suspended bottom
-Standard handhole minimum dimension of 3”
-or manhole
123
Clean out is a minimum size of
2”
124
How big is drain pipe in all tanks except pressure tanks
2” min
125
If the drain is piped to sewer what do you need
A sight glass or 3/4” test valve on the underside of pipe
126
If the tank is on a tower where is the control valve on discharge
In valve pit
127
If the tank is located over a building where is the discharge control valve
Under the roof near the point where the discharge enters the building
128
Suction tanks the control valve shall be
As close to the tank as possible
129
What kind of valve is in bypass
OS&Y gate valve
130
What “health regulation” is generally used when using potable water to fill tank
Fill line is above the tank overflow, this creates an “air break”
131
Heater water circulating pipes for wood and steel tanks are to be a minimum size of
2”
132
Relief valve location on water circulation pipes
Between the hot and cold water valves
133
Thermometer in cold water return pipe must go as low as
30F
134
What kind of pipe for hot water pipe
Copper tubing
Steel pipe (SCH 80 if in water)
Brass pipe (85% copper)
135
Pressure tanks shall be tested how
Hydrostatic test of 150 psi for 2 hours 0 loss
OR
Filling it to the proper level with water and applying air at operating pressure
Cannot lose more then 1/2 psi in 24hrs
136
Water level gauge on pressure tank is where and what size
3/4” and at each end
137
Water level gauge glass max size on horizontal pressure tanks
12”
138
Water level gauge glass max size on vertical pressure tanks
18”
139
All fittings and nipples to water level gauge must be
Brass, not less then 3/4”
EXCEPT the nipple that goes in the tank, it may be 1/2”
140
How is the glass water gauge usually protected
3/16 Brass rods
141
What must be provided between the valve and pressure gauge on pressure tanks
1/4” plugged outlet for inspectors gauge
142
Embankment supported rubberized tanks are made of
Nylon fabric coated with elastomer compound
143
What does the inlet/outlet have in ESCF tank
Vortex plate
144
What supplies the liquid level gauge in ESCF tank
Drain fitting
145
Water level gauge in ESCF tank is made of
2-3/8” clear acrylic tubing
146
Overflow pipe in ESCF tank is
2 inches larger then fill line
147
The 4” porous perimeter on ESCF tanks does what
Ensures drainage of melted snow and rain from inside the dike
(Also serves as leak detector for tank)
148
Earthen embankment has a slop ratio of
1.5:1
149
If ESCF tanks are located where temp is below _____ what is required
5F, and a water recirculating system
150
Recirculating pipe cannot be less then ___ (ESCF tank)
2”
151
Ground storage tanks require railings for tanks over
20ft high
152
Where are ladders for ground storage tanks
Inside and outside
153
Bedding for ESCF tank
3” of pea gravel and 6” of sand or soil
154
What is at the top of ESCF tank
Cement lined gutter
155
ESCF dike is how far above dam
1ft
156
Break tanks size
Based on 150% of fire pump capacity for 15 minutes
157
Break tank shall have
(Fill line requirements)
3 fill lines
2 Auto
1 Manual
158
Break tank Automatic fill is activated when water level reaches
4” below overflow
159
Gravity tank heating method
Gravity circulation
Elec. immersion heater
160
Suction tank heating method
-Steam heated vertical radiator
-Immersed steam coil
-Elec. immersion heater
161
ESCF heating method
Water Recirculation w/ heat exchanger
162
Gravity circulation pipe size
Not less then 2”
163
Direct discharge of steam pipe size
1” brass or copper
164
Direct discharge of steam pipe location
3-4” below water level
165
Pressure tanks range of size
300-30,000gal
166
Pressure tanks are permitted for use with
Sprinkler systems
Standpipe systems
Water spray fixed systems
167
When will low water switch send signal (pressure tank)
When water is 3” below normal level
168
When will pressure tank send air alarm
10psi less then full
10psi more then full
169
Concrete tanks test is
Filled with max water and left for 24 hours, over 72 hours water level cannot have dropped a measurable amount
170
Wood tanks test
Filled and tested for tightness for 48hrs
171
Water level and temp inspected (supervised)
Quarterly
172
Water level and water temp inspected (unsupervised)
Monthly
173
Exterior shall be inspected
Quarterly
174
Interior shall be inspected
5 years
175
Steel tanks without corrosion protection interior inspection
3 years
176
What test determines wall thickness
Ultra-sounds
177
What test is used to determine the integrity of the coating
Wet-sponge test
178
Where shall tanks with flat bottoms be vacuum tested
Bottom seams
179
What test is used to test coating adhesion
Cross hatch test
180
Level indicators shall be tested every
5 years for freedom of movement
181
Low/high water temp sensors shall be tested prior too
Heating season & Annually
182
Valve pit is to be a minimum height of
7 feet
183
PIV gate valve and on discharge to be a minimum of how far from side of valve house (outside)
3ft
184
ESCF settling basin is
3”
185
Hot water tank pipe extends how far into tank
1/3
