Ch6 DWV Systems: Copper and Plastic (PVF College of Product Knowledge)

Question 1

General characteristics to consider

in selecting any DWV components:

Answer 1

Corrosion Resistance, Noise Insulation, Unobstructed Joints and Gentle Bends, Local Code Requirements

Question 2

three
materials commonly used in DWV
systems today:

Answer 2

cast iron, copper and

plastic.

Question 3

Meaning of the term Copper DWV

Answer 3

a copper material used in a
DWV. a specific type of
copper tube, one of the four weight
grades in the category of plumbing
tube («K,”“L,” M,” and “DWV")

Question 4

Which of the 4 types of copper is the lightest?

Answer 4

DWV

Question 5

What process is used to assemble DWV Copper

Answer 5

Soldering (Sweat connections)

Question 6

How do you cut DWV copper to length?

Answer 6

Tubing cutter, Hacksaw, or abrasive wheel

Question 7

What are some differences
in the manner of applying heat to the
DWV joint when soldering?

Answer 7

Use a torch tip that produces a broader flame for distributing the heat evenly for larger diameter DWV Copper when Soldering. Longer lengths of time is also necessary for heating up larger diameter pipe when soldering. Faulty joints in copper
DWV systems are often the result of
“underheating,”

Question 8

There are
two basic types of fittings used with
copper DWV systems:

Answer 8

wrought and

cast.

Question 9

How are wrought fittings made?

Answer 9

made
by reshaping existing sections of
copper tube. Depending on the
configuration of the fitting involved,
this could mean bending the parent
material, enlarging it, or drawing a
branch opening out of one of the
walls.

Question 10

How are cast fittings made?

Answer 10

made of
bronze, poured in a molten state into
a mold, where it cools and hardens
into a basic shape. Bronze is an alloy
largely consisting of copper, with a
smaller percentage of tin added for
hardness. Once cast, the joint areas of
the fittings are machined to precise
dimensions to assure a proper
relationship with the mating tube
ends (or other piping material
involved).

Question 11

What is an elbow called in soil pipe?

Answer 11

Usually a bend; but for copper DWV - it’s same as supply fittings: an Elbow (strange, but true)

Question 12

DWV Copper Elbow angle types

Answer 12

Long turns (long turn & extra long turn - equivalent to 90 degree elbow), Closet bends (water closet),

Question 13

DWV Tees equivalent to what in soil pipe

Answer 13

sanitary tee

Question 14

DWV Double Tee Equivalent

Answer 14

Sanitary cross

Question 15

What is the Sovent Concept:

Answer 15

“the concept permits the elimination
of dual stacks in high rise buildings by
combining the drainage and vent
functions into a common system. The system requires the use of
two special fittings, called the
“aerator” and the “deaerator.”

Question 16

What does the aerator do?

Answer 16

The aerator fitting is located
at each floor level to join the
branches to the main stack. it limits the velocity of both
liquid and air in the stack;
(2) it prevents the stack from filling
with a solid plug of water that could
disturb the water seal in nearby traps;
(3) it efficiently mixes the waste flowing in the branches with air in
the stack.

Question 17

What does the deaerator do?

Answer 17

One deaerator is located at the
base of the stack to separate the air
flow from the liquid, insuring smooth
entry into the building drain and
sewer and relieving pressure at that
point.

Question 18

If ABS and PVC are used in the same system - do they need transition fittings?

Answer 18

Yes - they both require different solvents and primers to join. Same with PP - requires heating (thermal welding)

Question 19

Most DWV plastic pipe is

classified as what thickness (distance between OD and ID):

Answer 19

Schedule 40.. Also, there’s a thinner wall “Schedule 30” PVC
grade designed specifically for DWV
systems.