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ARE Building Systems > Kaplan- Lession 2: Water Supply & Drainage Systems > Flashcards

Kaplan- Lession 2: Water Supply & Drainage Systems Flashcards

1
Q

Supply systems are under ______, and thus must be sealed.

A

Pressure

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2
Q

What is the pH of neutral water?

A

7

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3
Q

Does the pH number go up or down with acidity?

A

Down.

Up is a basic or alkaline solution.

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4
Q

A piece of metal called a(n) _____ is inserted in a water tank to divert the deposition (from hard water minerals) rather than allowing it to form on the heat exchanger.

A

Anode

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5
Q

One psi is capable of lifting a column of water _____ high.

A

2.3 feet

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6
Q

If pressure in a water main is insufficient to supply the upper stories in a building what other 3 systems must be employed?

A

Downfeed system
Pneumatic tank system
Tankless system

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7
Q

T/F Water can be pushed up from below to almost any height.

A

True.

Water can never be sucked up from above to any height greater than 33 feet.

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8
Q

What is the disadvantage of a downfeed system?

A

The considerable weight added to the roof for the tank used to supply water to the upper stories. This adds structural costs especially in earthquake regions.

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9
Q

A ______ system uses a pressurized tank in the basement to supply water to higher levels.

A

pneumatic tank

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10
Q

A ______ system requires one or more variable speed pumps which constantly turn on or off or run at varying speeds to provide sufficient pressure at whatever demand rate the building requires.

A

tankless

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11
Q

What is the formula for thermal expansion of a pipe?

A

ΔL = Lk (T2 – T1)

ΔL = change in length
L = length
k = coefficient of expansion
T1 = original temperature
T2 = final temperature
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12
Q

Pipes should be supported every….
____ for plastic
____ for copper
____ for steel

A

4 feet for plastic
6 feet for copper
12 feet for steel

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13
Q

What are the two categories of sanitary lines?

A

Soil lines and Waste Lines

Soil lines carry water from toilets, urinals, etc.
Waste lines carry all other waste water.

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14
Q

What material is most often used for sanitary lines?

A

Cast Iron Pipe

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15
Q

How many gallons of water does the average toilet use per flush?

A

3-5 gallons

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16
Q

What is the best height for a handicapped toilet?

A

1’-7” which is the height of a wheelchair seat

17
Q

How high should grab bars be set at?

A

2-9” to 3’-0” (33”-36”)

18
Q

What height should a standard drinking fountain be set at?

What height should a handicapped drinking fountain be set at?

A

36”- 39”

32”- 36”

19
Q

What is designed to catch grease, hair, oil, string, rags, money, toothbrushes, etc. in a sanitary system?

A

An interceptor

20
Q

What is a cleanout?

A

A cleanout is a y-shaped segment of pipe that has a plug screwed into the end allowing the system to be cleaned out.

21
Q

What are manholes and how often should they be placed?

A

Manholes are the equivalent of cleanouts for large lines, ten inches in diameter and greater. They occur at 150’ intervals and wherever a new line is joined to an existing one.

22
Q

Which of the following statements is correct?

I. Rain water is slightly acidic?
II. Rain water is slightly alkaline?
III. Rain water tends to corrode metal pipes.
IV. Rain water is often less healthful than ground water.

A. I & III
B. II only
C. I, III, & IV
D. II, III, & IV

A

C. I, III, & IV

23
Q

Which of the following statements is correct?

A. Ground water is naturally soft.
B. Hard water is often hazardous to humans.
C. Ground water is naturally hard.
D. Hard water can be controlled by the use of acid neutralizers.

A

C. Ground water is naturally hard.

24
Q

Which of the following statements is correct?

A. Acidic water causes deposition, so pipes should be oversized.

B. Acidic water can be controlled by using zeolite or ion exchange process.

C. PVC pip is appropriate for supply piping in exposed locations above ground.

D. Copper and PVC are resistant to corrosion and therefore appropriate where water is acidic.

A

D. Copper and PVC are resistant to corrosion and therefore appropriate where water is acidic.

25
Q

Which of the following represents an extremely acidic pH reading?

A. pH = 5
B. pH = 7
C. pH = 9
D. pH = 17

A

A. pH = 5

26
Q

Which of the following piping materials is heated when two pieces are joined?

A. Steel
B. Copper
C. Iron
D. Plastic

A

B. Copper

27
Q

If the street main provides 100 psi, and there is a loss of 10 psi due to friction between the street and the building, a faucet can be placed ______ feet high if the require pressure at the fixture is 10 psi.

A

184’

2.3’= 1 psi
100-10-10 = 80 psi
80psi x 2.3’ = 184’

28
Q

A down feed system is different from a pneumatic system in that a down feed system

I. is necessary only when the street main pressure would not supply the upper floors.

II. is not pressurized

III. has no storage tank

A. I only
B. II only
C. III only
D. I & III

A

B. II only

is not pressurized

29
Q

Why is it necessary to keep storm drainage separate from sanitary sewage?

I. Storm drainage is more polluted than sanitary sewage.
II. Storm drainage tends to flow at high volumes, which are not treatable by the sewage plant.
III. Storm drainage is not pressurized but sanitary drainage is.

A. I only
B. II only
C. III only
D. II & III

A

B. II only

Storm drainage tends to flow at high volumes, which are not treatable by the sewage plant.

30
Q

The purpose of a sanitary trap is to

A. catch valuable objects before they enter the sewage system.

B. catch dangerous chemicals before they enter the sewage system.

C. keep storm drainage and sanitary sewage separate.

D. keep sewer gas from backing up into the building.

A

D. keep sewer gas from backing up into the building.

31
Q

What is a catch basin?

A. An inlet into the drainage system for surface runoff.

B. A device which keeps grease and other waste matter out of the sewer system.

C. A type of cleanout which provides access for inspection and maintenance.

D. A lined chamber into which sewage collects.

A

A. An inlet into the drainage system for surface runoff.

32
Q

How often should a cleanout be placed?

A

50’ in pipes 4” in diameter
100’ in larger pipes
and at every corner where the pipe changes direction more than 45 degrees.

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