Plumbing Inspection Section#1 Supply Plumbing Quiz#5

You should have finished Study Session 4 before starting this study session. This study session continues the discussion of supply piping.

The estimated completion time is one hour.

Objectives
At the end of this study session, you should be able to:

• Describe seven problems found with supply piping.

• Question 1

  Needs Grading

  	Briefly describe a cross connection.
  	Selected Answer: Cross connections are a possibility where supply plumbing and solid or liquid waste could coome together.  Correct Answer: A cross connection is a piping arrangement in which waste can back up into the supply piping and contaminate it when the pressure drops on the supply side. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Briefly describe water hammer, and why it occurs.
  	Selected Answer: Water hammer is a loud banging sound in the pipes. It occurs when valves are closed quickly and the water, which is moving with considerable velocity and momentum, has to stop very quickly. Correct Answer: Water hammer is a loud banging sound in the pipes. Water hammer occurs because water moving at several feet per second has to stop abruptly when a valve is turned off. The water bounces off the valve and creates a vacuum as it bounces away from the valve. The vacuum then violently attracts the water back to the low pressure area and the water again bounces off the closed valve. The effect of this is a reverberation, which sounds like someone pounding on metal piping with a hammer. Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List five locations in a house where there may be a cross connection.
  	Selected Answer: 1. Garden hoses left attached to a hose bibb 2. A toilet tank where the fill water enters at the bottom 3. A water softener 4. A humidifier connected to the supply plumbing system 5. A trap primer without an air gap Correct Answer: 1. Fixtures where the faucets spout is below the overflow or flood rim of the fixture 2. Fixtures where hand held showers, extendable faucets or vegetable sprayers can be left in tubs, basins or sinks 3. Garden hoses attached to a hose bibb 4. A toilet tank where the fill water enters at the bottom 5.A dishwasher where a solenoid valve separates the clean water from the gray water 6. A clothes washer discharging into a laundry tub 7. A water softener 8. A humidifier connected to the supply piping 9. A lawn or fire sprinkler system 10. A bidet where water enters at the bottom of the bowl 11. A hot water boiler 12. A swimming pool fill outlet located below the flood level of the pool 13. A trap primer without an air gap. Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List two devices that prevent backflow.
  	Selected Answer: 1. Pressure-type vacuum breaker 2. Reduced-pressure principle device Correct Answer:   1. Double check valve assembly 2. Reduced pressure principle device Response Feedback: [None Given]

• Question 5

  Needs Grading

  	What is the horizontal spacing of supports for copper piping?
  	Selected Answer: 6 to 8 feet Correct Answer:   6 to 8 feet Response Feedback: [None Given]

• Question 6

  Needs Grading

  	What is the horizontal spacing of supports for galvanized steel piping?
  	Selected Answer: 8 to 10 feet Correct Answer:   8 to 10 feet Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What is the implication of improper support on piping?
  	Selected Answer: leaking pipes Correct Answer:   The implication of improper support is leakage. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What vertical support is required for copper piping?
  	Selected Answer: At every floor and no more than about every 24 feet Correct Answer:   At least every ten feet, or every floor level Response Feedback: [None Given]

• Question 9

  Needs Grading

  	Where should the spout from the faucet be mounted on a modern plumbing fixture?
  	Selected Answer: should be above the overflow or flood drain rim of the fixture Correct Answer:   Entirely above the flood rim of the fixture Response Feedback: [None Given]

• Question 10

  Needs Grading

  	Why can plastic pipe not typically be used between units in shared dwellings?
  	Selected Answer: Because they are combustible.  Correct Answer:   Because it is combustible Response Feedback: [None Given]

• Question 11

  0 out of 0 points

  	Can polybutylene piping be used on a hot water recirculating loop?
  	Selected Answer:   No Answers: Yes   No Response Feedback: Good work

• Question 12

  0 out of 0 points

  	Is a vacuum necessary to have backflow at a cross connection?
  	Selected Answer:   No Answers: Yes   No Response Feedback: Good work

• Question 13

  0 out of 0 points

  	Polybutylene piping failures seem to be concentrated most at:
  	Selected Answer:   the crimp rings Answers:   the crimp rings elbows in the pipes horizontal splits in the piping at the connection to fixtures in vertical pipe runs only Response Feedback: Good work

• Question 14

  0 out of 0 points

  	A house with several different styles of crimp rings should be a cause for concern.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work

• Question 15

  0 out of 0 points

  	Plastic piping needs less support than copper piping because it tends to expand more.
  	Selected Answer:  True Answers: True  False Response Feedback: That's not correct

• Question 16

  0 out of 0 points

  	Polybutylene supply piping should not be closer than 18 inches to a water heater.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work

• Question 17

  0 out of 0 points

  	Vertical pipes at ends of runs are one method of correcting water hammer.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work