BS: Lesson 2 - Water Supply & Drainage Systems Flashcards

1
Q

What are the 3 types of plumbing systems

A

supply systems - pressurized system

sanitary system - gravity feed system

storm water system - gravity feed system

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2
Q

In regards to water supply, what are the 4 concerns for water

A

acidity

hardness

carcinogens

disease

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3
Q

Water that has a pH of 7 is

A

neutral

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4
Q

In terms of acidity, rain water that falls from the sky is, which one:

  1. has no acidity
  2. is slightly acidic
  3. highly acidic
A

slightly acidic

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5
Q

In terms of acidity, water with a pH between 7 and 14 is what?

A

A basic alkaline solution

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6
Q

What happens when rain water mixes with the bi-products of combustion in the air?

A

It forms sulfuric acid and nitric acid rain

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7
Q

What causes sulfuric acid rain

A

Rain water mixing with sulfuric acid from combustion air

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8
Q

What causes nitric acid rain

A

Rain water mixing with nitrogen compounds from combustion air

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9
Q

Why is acid rain a problem

A

It corrodes metal pipes

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10
Q

In terms of water supply and potability, what process results in “hard water”

A

Rain water seeping into the ground and disolving minieral like limestone (CaCo3), calcium and/or magnesium.

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11
Q

Does water hardness interfere with the cleaning and lathering capabilities of detergents and soaps

A

Yes

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12
Q

What four factors effect water pressure

A

Lift

Friction

Thermal expansion

Static head

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13
Q

In regards to water supply, the presence of bacteria and viruses in water are a result of what

A

Improper disposal of human and animal waste.

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14
Q

If water pressure from the main is insufficient to supply the upper floors of a building, what can be installed to increase the pressure

A

downfeed system

pneumatic tank system

tankless system

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15
Q

In regards to a downfeed system, what is the greatest height water can be sucked up

A

33 feet

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16
Q

Will pushing or sucking water in a downfeed system achieve the greatest height if trying to supply water to upper floors of a building over 3 storys

A

Pushing - water can be pushed up from below to just about any height

17
Q

Friction loss is a function of what?

A

Flow rate and diameter of the pipe.

Valves, tanks and other similar devices.

18
Q

In regards to hot water heaters and usage, the most cost effective way to conserve energy is to

A

Insulate the hot water pipes

19
Q

Arrange the following pipe materials in order of highest to least amount of thermal expansion: copper, PVC, steel, cast iron

A

PVC - greatest - coefficient of 35
copper - coefficient of 9.8
steel - coefficient of 6.5
cast iron - lowest - coefficient of 5.6

20
Q

In sanitary drains, what do sanitary vents do

A

Relieve pressure in the system and break the suction or siphoning action that occurs when water passes down thru the system

21
Q

When are soil lines and soil stacks referred to as waste lines and waste stacks

A

when a toilet is added

22
Q

What is the minimum diameter of a sanitary vent

A

1-1/4” or half the diameter of the drain it serves; which ever is greater.

23
Q

Per ANSI A117, what is the minimum size of a HCAP accessible restroom stall

A

48” wide by 56” deep

24
Q

At what height is the toilet seat of a HCAP accessible toilet

25
At what height should grab bars be above the finished floor
33" - 36"
26
What are the minimum lengths of HCAP restroom grab bars
36" and 42"
27
Height of drinking fountains for adults is?
36" - 39"
28
The problem of insufficient water retention for wells and springs and excessive runoff and flooding can be improved by intelligent designing of what?
Storm drainage
29
When or where would you use a gate valve
Petroleum lines, heavy liquid lines or lines with high flow rates
30
What are 2 of the solutions for resolving water hammer?
1. install a shock arrestor or surge arrestor | 2. install an air chamber - a length of pipe vertically with nothing but air