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Int. > Underground > Flashcards

Underground Flashcards

(115 cards)

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1
Q

Standard for the installation of private fire service mains

A

NFPA 24

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2
Q

What determines minimum earth cover on water mains

A

Frost line and surface load conditions

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3
Q

Excavation must conform with

A

Federal, Provincial, and municipal regulations

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4
Q

Once the frost line has been determined, the top of pipe shall be

A

1’ below the frost line

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5
Q

In areas where frost is not a factor, where shall the top of pipe be

A

Top of pipe 2’-6” below grade

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6
Q

Piping underneath driveways shall be buried a minimum of

A

3’ to the top of the pipe

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7
Q

Any pipe crossing underneath railroad tracks shall be a minimum of

A

4’ to top of pipe

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8
Q

Depth cover map is read from the

A

Top down

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9
Q

Why do fire mains require a deeper depth then city water mains

A

Because they are mostly static for there daily service

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10
Q

Trench bottom must be

A

True and even to fully support pipe

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11
Q

Trench bottom can be improved by adding crushed stone how big

A

3” in diameter (should be compacted)

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12
Q

Where rock sub grade or stones larger then 1 1/2 are encountered, how much bedding shall be used on top

A

4”

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13
Q

Flat bottom is defined as

A

Un-disturbed earth

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14
Q

Loose soil or select material is defined as

A

Native soil excavated

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15
Q

Type 1 laying condition is

A

Flat bottom

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16
Q

Type 2 laying condition is

A

Flat bottom, backfill lightly to centreline of pipe

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17
Q

Type 3 laying condition

A

Pipe bedded in 4” minimum loose soil, backfill to top of pipe

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18
Q

Type 4 laying condition

A

Pipe in sand, gravel, or crushed stone to depth of 1/8” of pipe diameter. 4” minimum

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19
Q

Type 5 Laying condition

A

Pipe bedded to its centreline in compacted granulated material, 4” min under pipe

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20
Q

Ductile iron pipe can be cut using

A
  • abrasive cut off saw
  • rotary wheel cutter
  • guillotine saw
  • milling saw
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21
Q

What saw is used for out of trench cuts/quick cuts

A

Abrasive cut off saw

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22
Q

Rotary wheel cutter can cut pipe up too what size

A

30”

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23
Q

Guillotine saw can cut pipe up to what size

A

16”

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24
Q

Miling wheel saw can cut pipe up too

A

6” or larger

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25
Cast iron cut ends should be
Beveled to 30 degrees and 1/8” back from the edge
26
Time required for mechanical cutting of ductile iron is
1 minute per 1” of diameter
27
Gauge lines on PVC pipe indicate
If the pipe is in the bell socket
28
4 parts of mechanical joint for ductile are
Flange with bell, rubber gasket, a gland, and tee head bolts
29
Ductile iron pipe lengths are
18 feet
30
18 foot lengths of ductile iron (3-12” pipe) can be deflected how much
12-19” per joint
31
18 foot lengths of ductile iron (14-42” pipe) can be deflected how much
11” per joint
32
PVC max deflection is
1 degree
33
Thrust forces are created when pipeline
Changes direction
34
Soil under streets must be compacted
To the street sub grade
35
Soil under streets are generally compacted in
6-12” lifts
36
When can frozen backfill be used
Never
37
Underground acceptance test consists of
200 psi for 2 hours or 50 psi above system pressure, whichever is greater. Allowed up to 5 psi loss
38
Tested for underground must occur where
-At the lowest elevation point of the system (no hydrants) -hydrant outlet
39
Flushing must produce a flow of at least
10ft/Sec (3m/sec)
40
Incoming spigot can be no higher then
24”
41
What is used to anchor fittings
Pipe clamps Tie rods Thrust blocks
42
Concrete mixture for thrust blocks is
1 part cement 2 1/2 parts sand 5 parts stone
43
Cast iron pipe first made in
1600’s western Germany
44
Asbestos cement pipe is commonly used in areas with
Corrosive soil conditions
45
Rubber gaskets in mechanical joints should be
Dipped in water or dipped in glycerine if in sub freezing weather
46
Steel pipe that is externally wrapped and internally Galv can be used
Between FDC and check valve
47
All pipe in underground shall be rated for a max system working pressure of not less then
150psi
48
Underground pipe shall be permitted to extend into a building (wall or slab) no more then
24”
49
Fittings shall be rated too no less then
150 psi
50
All connections of copper tube shall be
Brazed or joined using pressure fittings
51
2 dissimilar pipe types are joined, what is required
Insulated against the passage of electric current
52
The depth of pipe shall be measured from the
Top of the piping to final grade
53
Mains under large piles of heavy commodities or subject to heavy vibrations shall be buried at a minimum depth of
4 feet
54
Mains above ground shall be protected with
Bollards or other means approved by AHJ
55
Fire mains to extend no further than ____ under the building
10 feet/3 metres (measured from outside wall to centre of pipe going vertical)
56
Piping shall be a minimum of ___ from foundation or footings
12 inches
57
All joints shall be
Mechanically restrained
58
A valve shall be installed before the piping enters the building within ____ from the building
24”
59
Fire mains shall be restrained against movement at
Changes in direction
60
Thrust blocks shall be placed so that
Joints are accessible for repair
61
Clamps for pipe 4-6”
1/2 x 2”
62
Clamps for pipe 8-10”
5/8 x 2 1/2”
63
Clamps for 12” pipe
5/8 x 3”
64
Diameter of a bolt hole in clamps shall be
1/8” bigger then the bolt
65
Bracing Rods shall not be less then
5/8”
66
Rods must be
Symmetrically spaced
67
Clamp bolts 4-8”
5/8
68
Clamp bolts for 10”
3/4”
69
Clamp bolts 12”
7/8”
70
Washers shall be
Cast iron or steel, round or square
71
When using bolting rods, the diameter of the mechanical joint bolts cannot be bigger then
3/4”
72
Bell ends shall be installed facing
Uphill
73
Type 1&2 sloping
1:1 with max of 4’ from ground
74
Type 3 sloping
1:1 starting from the bottom
75
Type 4 sloping
1:3 starting from bottom
76
Angle for sloping
45 degrees
77
Type 1 soil
Hard ground, difficult to drive pick axe into
78
Type 2 soil
Soft ground, easy to drive pick axe into
79
Type 3 soil
Previously excavated
80
Type 4 soil
Material containing high moisture
81
Ladders to be no more then ___ apart in trenches
25 feet
82
Cathodic protection is
Anode welded to pipe, will corrode instead of pipe
83
Copper underground can only be what type
type k
84
PVC comes in lengths of
20 feet
85
HDPE stands for
High density polyethylene
86
Bend radius for high density polyethylene pipe
25x the pipe diameter
87
What pipe uses a form of fusion
HDPE (high density polyethylene)
88
What size pipe is minimum for supplying hydrants
6”
89
Non-Metallic pipe requires trace wire ___ above it for trace purposes
1 foot
90
Caution tape is out how far below finish grade
2 feet
91
Incoming main for pipe scheduled system shall be no smaller then
The riser feeding the system
92
Ductile iron has what kind of joint
Tyton
93
Cast iron has what kind of joint
Poured led
94
PVC has what kind of joint
Push on
95
4-24” pipe has what size bolts and what is the Torque
3/4 bolts, 75-90ft/lbs
96
Joints that do not require restraint are
-threaded -grooved -welded -heat fused -chemical or solvent
97
Asbestos cement joining method
AC couplings
98
HDPE joining method
Fusion or victualic
99
Concrete pressure pipe is for sizes ____ and up
16”
100
Formula for hydrostatic allowance loss is
L=SD✔️P divided by 148000 S=length of pipe D=Diameter of pipe P=pressure test of system
101
Washers to be used on pipe that are which size
3-12”
102
Most common thrust block
Bearing
103
Bearing thrust block is used where on fitting
On outside of fitting
104
Gravity thrust block is used when
There is a change in elevation in the trench
105
Thrust blocks shall be installed in
Stable soil
106
Minimum size pipe for underground
6 inch
107
6” GPM to achieve 10ft/sec
880Gpm
108
8” GPM to achieve 10ft/sec
1560gpm
109
10” GPM to achieve 10ft/sec
2440gpm
110
12” GPM to achieve 10ft/sec
3520gpm
111
Peto tube measures
Velocity
112
Gauge of wire for tracer wire is
10-14 gauge
113
AWWA means
American water works association
114
Hydrants to be installed how far from building
40 feet
115
Hydrants outlets are how far above the ground and how far above the floor in hose houses
18” and 12”

Int. (7 decks)

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