Site Utilities and Plumbing

Question 1

Utilities are piped below ground up to _ feet from the building

Answer 1

5

Question 2

If cast iron fittings are used, they must be _ lined

Answer 2

cement-mortar

Question 3

Fire hydrants will be _, depending on freezing conditions, and installed with _.

Answer 3

wet or dry barrel, protective posts

Question 4

Common materials include cast iron soil pipe, clay, concrete, or plastic up to _ inches in diameter.

Answer 4

15

Question 5

Manholes are installed in sewer and drain piping to permit _ of the pipes.

Answer 5

inspection and maintenance

Question 6

Straight runs of pipe will have manholes about _ feet apart.

Answer 6

500

Question 7

Manholes more than _ feet deep will include a permanent ladder and be eccentric in shape.

Answer 7

12

Question 8

Storm drain piping will carry only surface run-off water and underground seepage water by means of _.

Answer 8

gravity flow

Question 9

A single conductor, #_ AWG (American Wire

Gauge) wire with type TW insulation, is installed alongside plastic pipe to aid in locating the gas pipe.

Answer 9

14

Question 10

Gas steel pipe will be _ except at control valves, and coated as specified at the factory.

Answer 10

welded

Question 11

Gas pipe joints are coated in the field with _.

Answer 11

factory supplied materials

Question 12

Plastic pipe must be below ground, _ pounds per square inch gauge (psig) or less, and restricted to temperatures as specified in the contract.

Answer 12

100

Question 13

Excavated material must be at least _ feet away from the edge of the trench.

Answer 13

2

Question 14

Trenching more than _ feet deep may require bracing support, depending on the type of soil and
amount of moisture.

Answer 14

5

Question 15

Ladders are required in trenches over _ feet deep, within _ feet of workers, and must extend _ feet above the ground surface.

Answer 15

4, 25, 3

Question 16

The trench bed width is limited by specifications and extends from the bottom of the trench to _ foot above the pipe.

Answer 16

1

Question 17

Depressions called _ must be dug in the trench bottom to accommodate the _ of the pipe and to provide space for making the joint.

Answer 17

bell holes, bell joints

Question 18

The backfill material is specified by the contract. It gives the maximum rock size permitted, thickness
of each layer, compaction density, and _.

Answer 18

moisture content

Question 19

Bell ends must face _hill.

Answer 19

up

Question 20

Water lines must be _ feet horizontally from sewage lines, or at least _ feet if the water pipe is _ foot above the sewage line.

Answer 20

10, 6, 1

Question 21

Thrust blocks or tie rods are required at all bends of _ degrees or greater and at all caps, plugs, tees, and fire hydrants.

Answer 21

22-½

Question 22

Concrete thrust blocks should harden _ days prior to applying water pressure.

Answer 22

5

Question 23

Sewer lines that cross over water lines should be encased in _ inches of concrete for _ feet on each side of the water line.

Answer 23

4, 10

Question 24

Force mains must always cross _ feet beneath water lines.

Answer 24

2

Question 25

There are three methods of testing for leakage in sanitary sewer lines: ,,_.

Answer 25

exfiltration, infiltration,

and the air test

Question 26

When the trench has been backfilled to at least the _ (midpoint) of the pipe and the joints are still exposed, the pipe line must be tested for leakage by _.

Answer 26

spring line, exfiltration

Question 27

Each pipe section between manholes is then tested by _ it at the lower end. The pipe is then filled with water and a _-foot head imposed on the upper end.

Answer 27

plugging, 2

Question 28

The amount of water required to maintain it’s head during a _-hour period is measured.

Answer 28

2

Question 29

The leakage must not exceed _ gallons per inch diameter, per _ feet of pipe, per hour.

Answer 29

0.2, 100

Question 30

If the water table is above the top of the pipe, then the pipe must be tested by _.

Answer 30

infiltration

Question 31

The Infiltration method measures for leakage by a _ (or dam) at the lower end.

Answer 31

V-notch weir

Question 32

The third method used to test for sanitary sewer leakage, but one that is seldom used in Corps contracts, is a _ of vitrified clay pipe line (3 to _ inches).

Answer 32

low-pressure air test, 18

Question 33

The sewer section is plugged at each end and pressurized with air to _ pounds per square inch gauge (psig) and the time noted for the pressure to drop to _ psig.

Answer 33

3.5, 2.5

Question 34

This method can be used to locate a leak quickly and accurately by moving a pair of _ through the pipe and pressurizing the section between the _.

Answer 34

inflatable plugs, plugs.

Question 35

A _ test is conducted when the trench has been backfilled _ feet above the top of the sewer pipe.

Answer 35

Displacement, 2

Question 36

Each section between manholes is examined by _ into one end and observing the straightness of the pipe from the other end.

Answer 36

shining a light

Question 37

Flexible sewer pipe, such as single-wall plastic, is inspected for _ after the trench is completely backfilled.

Answer 37

deflection

Question 38

A plug of hard material having a diameter of _% of the actual inside diameter of the pipe is pulled through the
sewer section from one manhole to the other.

Answer 38

95%

Question 39

If the plug will not pass freely through the pipe, then the sewer section is not satisfactory because the overburden has deformed the pipe more than _% of its diameter

Answer 39

5%

Question 40

When watertight joints are required, a test is performed on each type of joint in the system before the pipe is installed. Two lengths of pipe are joined, and the joint is subjected to _
psi (pounds per square inch) hydro-static pressure for _ hours.

Answer 40

10, 24

Question 41

The contractor is required to apply a pressure test and a leakage test to the water piping, usually at _ psi or _ times the working pressure.

Answer 41

200. one-and-a-half

Question 42

n the pressure test, the water pressure is held for _ hour(s), and the exposed joints and
piping are examined for leaks.

Answer 42

1

Question 43

In the leakage test, the pressure is held for _ hour(s) and the leakage is measured by
recording the amount of water added to the system to maintain the pressure.

Answer 43

2

Question 44

Pipe made of concrete or asbestos cement, or which is cement-lined or has mortar joints, should be filled with water _ before the test to permit these materials to absorb water.

Answer 44

several hours

Question 45

The hydro-static pressure test for water piping that supplies fire protection systems must be at least _ psi and _ psi in excess of the maximum static pressure.

Answer 45

200, 50

Question 46

Fire hydrants must be tested as specified in _.

Answer 46

NFPA 24

Question 47

Natural gas system mains and service lines must be tested with air at _ psi or _% of the operating pressure, whichever is greater.

Answer 47

75 psi, 150%

Question 48

Natural gas tests must continue for at least _ hours between the times of initial and final readings of temperature and pressure.

Answer 48

24

Question 49

The sterilizing dosage of chlorine must be at least _ parts per million (ppm).

Answer 49

50

Question 50

Chlorine compounds must be _ in water

before they are fed into plastic pipelines.

Answer 50

Dissolved

Question 51

85 of 208

Answer 51

1