DWV Water Distribution and Fixtures for Residential Installation 060403c

Question 1

How should piping in a trench be supported?

Answer 1

Throughout its entirety

Question 2

How much cover should be placed over piping in a trench?

Answer 2

12” (300mm)

Question 3

What is the industry standard for spacing between pipes and the foundation/footing or wall to allow for movement?

Answer 3

6”

Question 4

Can copper DWV tubing be used underground?

Answer 4

No

Question 5

What type of copper tube may be used for underground drainage?

Answer 5

Types K and L hard temper

Question 6

What is the minimum hanger spacing for copper tube less than 1”?

Answer 6

3m (10’)

Question 7

What is the minimum hanger spacing for copper tube greater than or equal to 1”?

Answer 7

2.5m (8’)

Question 8

When installing a clevis hanger where should the yoke be located?

Answer 8

On the outside of the U-strap

Question 9

What form of backflow protection is acceptable on a branch?

Answer 9

Normally closed back water valve

Question 10

If a pump provides a flow of 10 imperial gallons per minute into a building drain, how many fixture units must you asign to the pump?

Answer 10

10 imp gallons/min x 4.54 litres/imp gallon = 45.4 litres/min

(45. 4 litres/min) / 60 sec/min = 0.76 l/sec
0. 76 litres/sec x 31.7 FU/litre/sec = 24 FU

IF PUMPING INTO COMBINED BUILDING SEWER MULTIPLY BY 900

Question 11

What is the minimum pressure for a smoke test on DWV?

Answer 11

1” WC

Question 12

What is the minimum pressure test requirment on potable water in a residential application?

Answer 12

100psi for 2 hours

Question 13

What is the maximum operating pressure for PVC pipe?

Answer 13

140°F (60°C)

Question 14

What is the minimum SCH PVC that may be threaded?

Answer 14

SCH80

Question 15

What is the minimum weight(crush strength) for a cast iron soil pipe used in alberta?

Answer 15

18kN (4000lb)

Question 16

How is polyethylene aluminum polyethylene (PE/AL/PE) or Kitec piping joined?

Answer 16

Insert fittings and crimp rings or kitec compression fittings

Question 17

What is a 1/4 bend cast iron pipe fitting?

Answer 17

90° elbow

Question 18

Mixing tin and copper produces what copper alloy?

Answer 18

Bronze (90% copper 10% tin)

Question 19

How is copper tube sized?

Answer 19

Approximate ID or NPS (nominal pipe size)

Question 20

How is copper tubing sized?

Answer 20

Exact OD

Question 21

How is copper pipe sized?

Answer 21

Approximate ID or NPS up to 12”

OD 14” and over

Question 22

How is soft temper type K or type L joined?

Answer 22

Brazed, compression or flared

Question 23

What copper type shall not be bent?

Answer 23

M (red)

Question 24

What joint type used on copper or brass fittings has the highest pressure capability? Which is the lowest?

Answer 24

Flared is highest

Solder is lowest

Question 25

What piping material has the greatest rate of expansion?

Answer 25

Plastics (ABS or PVC)

Question 26

What is the fixture unit value of a pump that produces a volume of 15 GPM and discharges into a building drain?

Answer 26

15GPM x 4.54litres/gal = 68.1 l/min

(68. 1 l/min) / (60sec/min) = 1.135 litre/sec
(1. 135 l/sec) x 31.7 FU/l/sec =
35. 98 FU

Question 27

What is the minimum trap size for a bidet?

Answer 27

11/4”