Deck 5: Sizing Potable Water Lines and Fuel Gas Piping Systems

Question 1

Peak demand is determined by accounting for full demand from all fixtures in a building simultaneously.

Answer 1

False

Question 2

Major plumbing codes limit velocity to how many feet per second?

A)10 feet per second
B)6 feet per second
C)8 feet per second
D)12 feet per second

Answer 2

C

Question 3

Which of the following vent sizes would be appropriate to connect to a gas appliance with a four-inch outlet?

A)2.5-inch vent
B)3-inch vent
C)5-inch vent
D)2-inch vent

Answer 3

C

Question 4

The National Fuel Gas Code (NFGC)describes category I appliances as producing:

A)flue gases at negative pressure, temperature likely to form condensate
B)flue gases at negative pressure, temperature unlikely to form condensate
C)flue gases at positive pressure, temperature likely to form condensate
D)flue gases at positive pressure, temperature unlikely to form condensate

Question 5

When sizing gas appliance vents, horizontal offset should not exceed:

A)100 percent of vent height
B)50 percent of vent height
C)150 percent of vent height
D)75 percent of vent height

Question 6

According to code, what is the maximum system pressure psi for fixture pressure?

A)80 psi
B)100 psi
C)60 psi
D)40 psi

Question 7

What time period is considered when determining maximum rate of flow for peak demand?

A)1 hour
B)24 hours
C)6 hours
D)12 hours

Question 8

What should be your first step when sizing water service and water distribution layout?

A)prepare a diagram of the distribution system
B)obtain lowest probably pressure delivered at the site from water utility
C)select water pipe sizes
D)determine available pressure drop for pipe friction loss

Question 9

Materials such as PEX or CPVE are less affected by acidic water than copper or galvanized piping.

Question 10

Peak flow at system fixtures considers:

A)duration of use
B)frequency of each use
C)rate of water required
D)all of the above

Question 11

Which of the following pipe-sizing methods most accurately describes segmented loss?

A)includes individual supply lines from each fixture to central supply header
B)considers that friction will result in even pressure loss
C)uses calculations of friction loss for pipe and fittings
D)considers piping material used, and water speed

Question 12

Technicians who are skilled in design should typically defer design decisions to licensed design professionals.

Question 13

Which of the following is NOT a typical pipe-sizing method:

A)velocity
B)parallel loss
C)uniform pressure
D)segmented loss

Question 14

Which of the following is a characteristic of high-efficiency appliances?

A)they contribute to highly positive building pressure
B)they require masonry chimneys
C)they require extra venting
D)they delivery relative cool combustion gases

Question 15

In situations where there are long straight runs for piping, which piping material is likely the best choice?

A)PEX
B)CPVC
C)galvanized piping
D)lead