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A- General Engineering License > Underground Utilities > Flashcards

Underground Utilities Flashcards

1
Q

What type of piping reduces in cross sectio by folding for insertion?

A

Thermo Formed Pipe

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2
Q

When should in-line replacement by considered (ILR)?

A

When the capacity of a pipeline is found to be inadequate

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3
Q

Three main categories for trenchless construction methods:

A
  1. Horizontal Earth Boring
  2. Pipe Jacking
  3. Utility Tunneling
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4
Q

The steeper the slope of a gravity pipe the ___

A

higher the possibility that pipe segments deteriorate

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5
Q

Depending on the size of the pipe and the nature of the lining being applied, the recycled content for DI pipe can exceed ____%

A

90%

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6
Q

Steel building LEED Credit: use materials with recycled content such that the sum of post-consumer recycled content plus one-half of the post industrial content constitutes?

A

5% of the total value of the materials in the project.

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7
Q

List Pipe Weld Positions:

A

1g horizontal rolled position
2g vertical position
5g horizontal fixed position
6g inclined position - 45 degrees

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8
Q

What is PBT?

A

Polybutylene is a flexible (grey or black) plastic pipe which is attached with barbed fittings and secured in place with a copper clamp

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9
Q

Galvanized CSP can provide a service lift of?

A

50 years

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10
Q

What is HOBAS Pipe?

A

HOBAS is a manufacturer of glass fiber reinforced plastic

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11
Q

How many miles of interstate and instrastate transmission NG piplines are there?

A

300,000 miles of NG pipeline

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12
Q

Why does the slope of a gravity pipe have an impact on the condition of the pipe?

A

The steeper the slope the higher the possibility that pipe segments will deterorate.

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13
Q

What is a sonde and what test system is it used with?

A

Specially constructed electrode used with the FELL test - Frequency location - pinpoint blockages or pipeline defects when used with video inspection systems

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14
Q

What type of paints use varnish as a vehicle?

A
  1. Resing Based Paints
  2. Oil Based Paints
  3. Enamels
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15
Q

Vinyl alkyd resin is used to control corrosion on what surface?

A

Steel

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16
Q

What is the millimeter thickness for a single coat polymer on underground applications?

A

40 to 250 mm

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17
Q

What are the burn temperatures for a:

  1. Propane/Air Flame
  2. Propane/ Oxygen Flame
  3. Acetylene/Oxygen Flame
A
  1. 2,000 C (3,630 F)
  2. 2,500 C (4,350 F)
  3. 3,500 C (6,330 F)
    * T(F) = T(C)*1.8 + 32
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18
Q

What is the most common method of mechanized brazing?

A

Torch brazing

19
Q

What is a semi-automatic or automatic arc welding process that requires a continuously fed consumable tubular electrode containing a fluz and a constant voltage?

A

FCAW = Flux-cored arc welding

20
Q

When not welding, Arc welding involves open circuit voltages of?

A

20 - 100 volts

21
Q

What is vacuum aluminum brazing?

A

A high purity process and, inlike drip-brazing, there are no residual salts left on the surfaces or trapped within the recess features of the components to be brazed.

22
Q

A three-carbon alkane with the molecular formula C3H8 is?

A

Propane

23
Q

What is a high vapor pressure, unsuitable for vacuum brazing?

A

Maganese

24
Q

What is the difference between MIG & TIG Welding?

A

MIG = wire feed- metal inert gas - GMAW = Gas Metal Arc Welding

TIG = heli-arc - tungsten inert gas - GTAW = Gas Tungsten Arc Welding

25
Q

Water hydrants - connecting a line to main should be no less than?

A

6” per AWWA Manual M-17

26
Q

A water hydrant should have what size and type of pit to prevent freezing?

A

2 x 2 x 2’ coarse gravel drainage pit to a depth of 6” above the hydrant openings.

27
Q

Average cure time for thrust blocks?

A

At least 2,000 psi at 28 days and with a minimum cure time of 5 days

28
Q

What is the flush velocity and pressure test of ductile iron water lines?

A

Flush velocity at 3 FPS

P-test at 1.5 times the stated working pressure for at least 2 hours

29
Q

What are the three methods of chlorine cleaning piping?

A
  1. Continuous feed
  2. Tablet
  3. Slug AWW C51
    25mg/L feee chlorine and retained at least 24 hours and tested - 1fps
30
Q

Ductile iron service tap requirements?

A

For 6” and larger DI pipe -> 1” direct taps located at 10 or 2. Taps staggered around circumference at least 12 inch apart. Do not drill in a straight line.

-> dissimilar metals at connections - 3’ clear distance of dielectric tape

31
Q

Temperature growth of DI pipe?

A

100F, 20’ length at 0.15 inches.

32
Q

Wall penetration recommendation?

A

Locate flexible joint about 18” from wall:

33
Q

Cover requirements for a NG main and pipeline?

A

Main -> not less than 24”

Pipeline -> 24” - 36”

34
Q

Clearance between NG mains and pipelines and other underground structures?

A

Main -> 6”

Pipeline -> 2”

35
Q

Spacing between valves for NG pipeline dependent on location class?

A

Class 1 = 20 miles
Class 2 = 15 miles
Class 3 = 10 miles
Class 4 = 5 miles

36
Q

Class location definitions for NG pipeline?

A

Class 1 = 10 homes are fewer
Class 2 = more than 10 but fewer than 46 homes
Class 3 = 46 or more homes
Class 4 = high rises/ urban

37
Q

Formula guideline for maximum width of trench for concrete pipe?

A

1.25D + 1 foot

38
Q

How should you lay concrete pipe?

A

the bell end typically should point upstream and the spigot or tongue should point downstream

39
Q

Minimum Flattened Polyethylene Tube Widths for Push-on Joint* pipe?

A

Approximately 1.25OD + 12”

40
Q

What are the three devices used for compaction and the type of soil they compact best?

A

The steel wheeled roller is best suited for compacting coarse aggre- gate such as slag, coarse gravel and graded rock aggregates.
The sheepsfoot roller is best for co- hesive clays or silts, but is not suitable for use on granular soils.
Specially designed rubber tired roll- ers, which provide both static weight and kneading action, are applicable to many soils from clays to sand.

41
Q

To perform the infiltration test on concrete pipe, the water table should be at least what height over the crown of the pipe?

A

2 feet

42
Q

What is the minimum thickness of the base course, aggregate size and layer thickness for a culvert?

A

3” minimum base layer with 2” layers and 1-1/2” sized aggregate

43
Q

How should boxes be placed?

A

start at the outlet end of the line of box sections. The bell end should point upstream and the spigot or tongue should point downstream.

A- General Engineering License (13 decks)

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