PLUMBING Flashcards
What is the rule of thumb for grading a sewer line?
1/4 inch per foot
When a pipeline must cross under a road, the trench must be at least what depth?
4 feet
What weight of pipe is adequate for most Navy base construction?
SV (Extra Heavy Standard)
What tools for cutting CSIP should be used only if the most appropriate tools are not available?
Abrasive cutter
A 1/16th bend changes the direction of a pipeline a total of how many degrees?
22 1/2”
What type of tee should you use to connect lines of different sizes?
Reducing
Which of the following types of 90 degree Y-Branches can be used as an individual vent?
Double
Horizontal 4- inch building drain lines in a straight run should have clean outs places at what minimum intervals?
50 feet
A long hubbed fitting used for insertion into an existing line is called a______?
Sisson
What special fitting should be inserted into a soil branch for use with a water closet?
A closet bend?
If the gas pressure of a propane furnace puts ou the lighter flame, you should____?
Close the fuel valve
To ensure plastic pipe and fittings are thermally balanced you should keep them at the same temperature for what length of time before welding?
60 minutes
What are the four methods of joining plastic pipe?
Fusion Welding
Fillet Welding
Threading
Solvent Welding
What is the most popular test for checking leakage of sewer pipe after the roughing-in is completed?
Water
What action should you take when a pipeline you are testing for leaks, by the air method, does not hold a pressure of 5 psi for 15 minutes?
Apply a soapy water solution to the joints and look for bubbles.
Changes in sizes of sewer lines should be made only at what part of the sewer system?
Manholes
When backfilling sewer systems, you fill to 2 feet above the pipe by hand with clean material. When, if ever, should you tamp the backfill material?
Every 4 inches
What type of above ground pipe has a zinc coating to protect it against acid waste?
Galvanized wrought iron
What type of pipe consists of an alloy of zinc and copper?
Brass
What is the most important function of a trap?
To prevent sewer gases from entering a building.
What does the term “trap seal” mean in plumbing?
The water held in the bent portion of a fixture
What is the purpose of vent piping in a plumbing system?
To maintain the seals of fixture traps.
What portion of the venting system extends above the highest fixture branch?
The main soil and waste vent
What type of vent is used to vent two traps to a single pipe?
Common
What maximum number of fixtures is permitted on a circuit vent system?
Eight
A wet vent that drains five fixture units must have a diameter that is what size in inches?
2
Cast-iron pipe for water supply systems comes in standard lengths of how many feet?
5
What are the three major types of fittings used with cast-iron water pipes?
Tees
Bends
Elbows
A measurement was taken from end of a pipe to the center of a fitting. What type of measurement was used?
End to end
How can you join two pieces of copper tubing?
By soldered or flared fittings
You have hacksawed a piece of copper tubing for flaring. Before making the flare on one end, you should perform which of the following actions?
Slip a flare nut on the copper tubing
How will the kitchen, bathroom, and laundry areas be placed in a well planned building?
Back-to-back
Above each other
Below each other
In an efficient kitchen design, stove, fridge, and sink are placed so that traffic between them forms a tight triangle. The recommended combined distance between the three should not exceed _____ feet.
22
When designing plumbing for a utility room, what four fixtures usually need to be accounted for?
Washer
Water heater
Water softener
Water filter
What has to be selected before rough-in dimensions can be determined?
fixtures
What three systems comprise a typical residential plumbing system?
Drain-waste-vent piping system
Water supply piping system
Storm water piping system
How is the storm drain system piping different from the DWV system piping?
Only collects water that is unpolluted and caries it to the storm sewer.
What determines which type of material will be used for the DWV system?
Local Plumbing code requirements
Cost
Preference of owner
What can happen if the DWV pipe size for a fixture is too small?
Waste will not be permitted to flow properly from the fixture.
During which stage of an estimate will fixtures, faucets, and parts needed for their connection be identified?
Finish stage
What occurs during the FIRST stage of plumbing?
Water supply and sewer lines are extended from the mains (usually in the street) to the building.
What stage of plumbing is when all the plumbing that will be enclosed in the walls are installed?
Second stage
What is considered to be an adequate slope for the horizontal runs on the storm drain and DWV piping systems?
1/8” to 1/2” per foot
How do skilled plumbers try to locate/arrange piping while designing a plumbing system?
Group fixtures in rooms and floors as much as possible
What type of paper is not suitable for use in the DWV system?
Black iron
What is the standard load factor for a flush-valve operated water closet?
8
What codes are used as the FINAL authority for determining size and slope drainage pipe connecting soil stacks to the sewer or septic tank?
Local plumbing codes
What condition is caused when a difference in pressure exists between two piping systems?
Cross-connection
What is the FIRST and one of the most important steps in estimating a plumbing project?
Understanding what is to be accomplished
At a MINIMUM, what information should be identified on a Material and Supply list for a plumbing project?
Description, Quantity, Size
What size water supply pipe is recommended for use on a shower?
1/2”
