DWV Water Distribution and Fixtures for Residential Installation 060403c Flashcards
How should piping in a trench be supported?
Throughout its entirety
How much cover should be placed over piping in a trench?
12” (300mm)
What is the industry standard for spacing between pipes and the foundation/footing or wall to allow for movement?
6”
Can copper DWV tubing be used underground?
No
What type of copper tube may be used for underground drainage?
Types K and L hard temper
What is the minimum hanger spacing for copper tube less than 1”?
3m (10’)
What is the minimum hanger spacing for copper tube greater than or equal to 1”?
2.5m (8’)
When installing a clevis hanger where should the yoke be located?
On the outside of the U-strap
What form of backflow protection is acceptable on a branch?
Normally closed back water valve
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?
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
What is the minimum pressure for a smoke test on DWV?
1” WC
What is the minimum pressure test requirment on potable water in a residential application?
100psi for 2 hours
What is the maximum operating pressure for PVC pipe?
140°F (60°C)
What is the minimum SCH PVC that may be threaded?
SCH80
What is the minimum weight(crush strength) for a cast iron soil pipe used in alberta?
18kN (4000lb)
How is polyethylene aluminum polyethylene (PE/AL/PE) or Kitec piping joined?
Insert fittings and crimp rings or kitec compression fittings
What is a 1/4 bend cast iron pipe fitting?
90° elbow
Mixing tin and copper produces what copper alloy?
Bronze (90% copper 10% tin)
How is copper tube sized?
Approximate ID or NPS (nominal pipe size)
How is copper tubing sized?
Exact OD
How is copper pipe sized?
Approximate ID or NPS up to 12”
OD 14” and over
How is soft temper type K or type L joined?
Brazed, compression or flared
What copper type shall not be bent?
M (red)
What joint type used on copper or brass fittings has the highest pressure capability? Which is the lowest?
Flared is highest
Solder is lowest
What piping material has the greatest rate of expansion?
Plastics (ABS or PVC)
What is the fixture unit value of a pump that produces a volume of 15 GPM and discharges into a building drain?
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
What is the minimum trap size for a bidet?
11/4”
