Potable Water 301F

Front 1

What are the two basic types of water Distribution Systems?

Back 1

Gravity and forced.

Front 2

Define pressure head, and how is it measured by

Back 2

Pressure available at some point in the water system, it is measured by the depth of the column of water above the point where the measurement is taken.

Front 3

How many psi are in 1 foot of water column?

Back 3

.433 PSI

Front 4

A column of water how high, will produce a pressure of 1 psi?

Back 4

2.31 ft

Front 5

TEL stands for?

Back 5

Total equivalent length

Front 6

Friction loss in piping is also referred to as?

Back 6

Head loss

Front 7

Piping material being used is measured in what length?

Back 7

Per hundred feet of piping material

Front 8

When low water pressure is experienced, the engineer has several methods to use to increase the pressure. What are two of the most common methods?

Back 8

Gravity systems and

pressure or Force systems

Front 9

Gravity or tank systems are generally used when?

Back 9

The incoming water pressure is too low or sometimes too high.

Front 10

Hanger spacing for CPVC?

Back 10

1 m

Front 11

The gravity system requires an additional expense what is it?

Back 11

An additional expense for a tank.

Front 12

What is the advantage of providing a storage water tank in a gravity system?

Back 12

It can act as a reserve Supply.

Front 13

What device is used to to regulate the supply to a water tank?

Back 13

Ball float valve

Front 14

What is the name of the cover for a curb cock?

Back 14

Buffalo box or

burry box extension

Front 15

The size of a roof tank is determined by?

Back 15

The volume of water in (Gpm) gallons per minute that will be used in a given time.

Front 16

What is the disadvantage of a roof tank system in a gravity system?

Back 16

Periodic cleaning required to maintain taste free water.

Front 17

What is the source of supply in a forced Street pressure system?

Back 17

The city water under pressure.

Front 18

In a forced water system what are some disadvantages?

Back 18

Excessive pressure and low pressure.

Front 19

What does excessive pressure cause in a forced water system?

Back 19

Increased leakages in piping or fixtures.

Front 20

In a forced system what happens if the pressure is too low or variable?

Back 20

The water will not flow properly requiring pumps to maintain adequate pressure.

Front 21

In a combination of main pressure and booster pump pressure systems, how is the hot water pressure controlled?

Back 21

Through pressure-reducing valves (PRV).

Front 22

Up feed booster pump systems are recommended for what buildings?

Back 22

Buildings that are only a few stories High where City pressure can't reach.

Front 23

What is the simplest water delivery system?

Back 23

Upfeed booster system.

Front 24

Why is the up feed booster system the simplest to install?

Back 24

Because only one main and one Riser are used.

Front 25

And up feed booster system is set to operate at what PSI?

Back 25

100 to 110 PSI

Front 26

An upfeed boost system is adequate for buildings up to how many stories High?

Back 26

Up to 20 stories High.

Front 27

What is the maximum static pressure at any fixture?

Back 27

550 kPa / 80 psi

Front 28

In a down feed booster system where are the supply mains located? And where is the booster pump located?

Back 28

The mains are at the top of the building and the booster pump is at ground level

Front 29

In down feed booster systems all water passes through where?

Back 29

Booster pumps

Front 30

In downfeed booster systems where is the boiler room and hot water storage tank usually located?

Back 30

At the top of the building.

Front 31

What must be installed in a very tall buildings where the height of the building causes the pressure to be too high on the lower floors?

Back 31

Pressure reducing valve (PRV)

Front 32

In a prv downfeed booster system how many hot and cold Maine Supply and branches are required?

Back 32

It requires only one Hot and Cold Supply system of mains and branches

Front 33

In a combination upfeed/down feed prv system how are the risers ran?

Back 33

Upfeed risers Supply the lower floors and down feed risers Supply the upper floors

Front 34

In a combination

upfeed/down feed prv system cold water for the lower floors is fed from?

Back 34

Directly from the municipal Supply

Front 35

In a combination upfeed main pressure and booster system with hot pressure reducing valve, what two systems are required?

Back 35

Lower floor at Main pressure and Upper Floor at a booster pressure.

Front 36

For a Combination Upfeed Main pressure and booster system with hot pressure reducing valve, At the lowest floor level the sections that are supplied by booster pumps require a?

Back 36

Pressure reducing valve (PRV)

Front 37

Placing automatic air vents at high points does what in a water system

Back 37

Eliminates airlocks

Front 38

What is required whenever a water line is hooked up to a plumbing system when there's no air gap protection?

Back 38

Vacuum breakers.

Front 39

What is the spacing for an air gap?

Back 39

2 pipe diameters or 1 in

Front 40

What does RP stand stand for?

Back 40

Reduced-pressure principle backflow preventer

Front 41

What's two different types of vacuum breakers can there be?

Back 41

Physical air gap or mechanical air separation.

Front 42

Shock absorbers should be located at what spacing on a branch?

Back 42

At least every 20 feet.

Front 43

Every potable water system shall be able to withstand a water pressure of?

Back 43

700 kPa or at least equal to the maximum pressure to which they are subjected.

Front 44

The lavatory of 8.3 LPM has a fixture unit rating of?

Back 44

.7 fixture units

(note. Do not confuse the fixture unit used for sizing water systems with the fixture units used for drainage waste and vent)

Front 45

When sizing for small commercial building water Distribution Systems , A water service pipe is measured from where?

Back 45

The property line or private water supply system to the entry point in the building usually the building isolation valve or water meter

Front 46

For small commercial buildings water Distribution Systems, water distribution system pipe is measured from?

Back 46

From the entry point in the building, the valve or water meter, to the furthest fixture served

Front 47

When should a hot water distribution system require a recirc line or self regulating heat tracing?

Back 47

Developed length greater than 30 m, or is more then 4 stories High

Front 48

What is the newest and most commonly used water meter in small residential applications?

Back 48

The positive displacement meter

Front 49

The rotating disc meter is commonly used for commercial buildings where the size of the building service was?

Back 49

2" trade size or smaller

Front 50

What water meter is designed for installations we're freezing might occur?

Back 50

Cast iron base meter

Front 51

The split case water meter is designed for?

Back 51

Installations in warm areas only.

Front 52

What do the two sections of a turbine meter consist of?

Back 52

Main case and

measuring chamber

Front 53

What does the cast iron base meter do if Frozen?

Back 53

The base or bottom is constructed of weak material that will fracture keeping the more expensive Parts safe.

Front 54

Compound meters are designed to read what water flows?

Back 54

Large water flows are registered on the turbine meter portion and small flows on the positive displacement disc meter portion

Front 55

When a large meter is installed what circuit should be provided and why?

Back 55

A bypass circuit should be provided so the meter maintenance can be accomplished without service interruptions

Front 56

When large meters are installed in a vault what Provisions should be made?

Back 56

At least 20" of clearance to the vertical Vault walls in 24" of headspace from the highest point on the meter to the Vault cover

Front 57

Buildings with more than one meter must have a metal or plastic tag securely attached where?

Back 57

To the control valve handle of the meter it serves

Front 58

Bypass valves max distance from floor, and main pipe alignment minimum distance from any wall partition fixture or other piping?

Back 58

66" Max from floor. 18" from any wall partition fixture or other piping.

Front 59

Min shut offs for a meter bypass?

Back 59

3

Front 60

The loop bypass design is popular where?

Back 60

Where it's not practical to use the offset bypass design

Front 61

Two common types of insulation for water piping?

Back 61

Fiberglass and flex rubber.

Front 62

Most common type of pipe insulation?

Back 62

Fiberglass pipe insulation

Front 63

What is flex rubber insulation also known as?

Back 63

Dual temperature insulation

Front 64

Flex rubber insulation / dual temperature insulation is effective at what temperatures?

Back 64

-40°F to 220°F

Front 65

Fiberglass insulation strap spacing?

Back 65

450mm

Front 66

Can you interconnect private Water Supplies with Public Water Supplies?

Back 66

Nopadope

Front 67

Every water supply shall be sized according to what? And what is the minimum size?

Back 67

Size according to Peak demand flow. Not less than 3/4" nominal size

Front 68

Define velocity and

Back 68

Velocity is The rate that fluid flows and pressure is the force exerted on the pipe walls

Front 69

What is the term to describe water piping inside a building?

Back 69

Distribution piping

Front 70

What is the primary use for a turbine meter?

Back 70

Used as a monitoring device for large flow volumes

Front 71

Do water meters have to be electrically grounded?

Back 71

Yes

Front 72

How far must a water meter be from an entrance, wall or grade Wall?

Back 72

12"

Front 73

How much water should be distributed to each urinal from a flush tank?

Back 73

An equal amount