Ch7 Special Pipe and Fittings

Question 1

What do these specialty products all have in common

Answer 1

common.They all serve
to connect the products we have
discussed up to this point in the
course—piping materials—with the
ones we’ll be examining in
succeeding sections—faucets, valves,
and later, fixtures.

Question 2

What are tubular goods?

Answer 2

“tubular goods” is the
industry term commonly used for the
drain components that connect sinks,
lavatories and laundry tubs to the
DWV system.

Question 3

purpose of a fixture trap

Answer 3

to prevent gasses (and possibly
vermin) from entering a building
through the fixtures. The trap
accomplishes this by maintaining a
seal of water in the low-bend portion
of its configuration. Such protection
is not only desirable, it is required by every local code in the country.

Question 4

Explain the slip joint method of joining tubular goods

Answer 4

brings the mating
components together in a
“telescoping” relationship.A threaded
nut on the female end compresses a
gasket ring around the inserted male
tube end when tightened, resulting in
a watertight seal. While it does not
provide an extremely strong
mechanical joint, the seal is adequate
for non-pressure applications.

Question 5

Explain the Union (Washer Type Or Ground

Joint) connection

Answer 5

Unlike a slip
joint, this type of connection provides
a tighter, more mechanically secure attachment of components. In this
case, a nut catches the shoulder of one
component, drawing the joint tight
by screwing onto the threads of the
other component.

Question 6

Explain the two types of union connections - the “washer” version and the
“ground joint.”

Answer 6

The washer type of
union involves the mating of two flat
surfaces that “sandwich” a washer-like
gasket in-between. The ground joint
type is really very similar to the union
of the same name used with supply
fittings—the end of one component
has a spherical shape that relates to a
mating socket on the other
component. Both basic types are
drawn tight by means of the nut
provided.

Question 7

Explain the Threaded joint connection method:

Answer 7

Certain tubular
components are offered with
threaded connections for making
joints to threaded waste fittings (to
link the trap components with the
DWV system).

Question 8

What is the solder sweat connection method used for:

Answer 8

For making joints
to connect to a copper DWV system,
this type is used.

Question 9

What is the solvent weld connection method used for:

Answer 9

used in relation
to a plastic DWV system (must be a
like material).

Question 10

explain Tailpiece for Kitchen sink

Answer 10

The tailpiece is the
component that attaches in “union” fashion directly to the strainer assembly of the sink Each tailpiece has a flange on the
very top that is caught by the lower
nut of the strainer, sealing it against a
sandwiched gasket.

Question 11

explain “trap” for kitchen sink

Answer 11

When the word “trap” is used
with a tubular line, it usually means
more than one part: a “J” bend, a connecting waste arm or elbow, and
sometimes, a flange for the wall or
floor. In other words, a tubular trap is
not a “part,” it is a set of parts—an
assembly. The type of arm or elbow
supplied determines the basic type of
trap it is—”P,”“S” or “sink.”The

Question 12

Functional differences between “P” and “S” traps

Answer 12

In function, the “P” trap
connects to a stack or waste line back
in the wall, whereas the “S” variety
routes the water down through the
floor to connect to the DWV system
somewhere below. In general
practice, the “S” type is not allowed
by most codes today, since it does not
provide as good a venting capability
as the “P” type.

Question 13

explain the sink traps

Answer 13

The third basic style of trap, called
the “sink” type, looks like a “P” trap
with a short waste arm. Actually, the
sink trap uses an elbow, rather than a
tubular arm, that attaches to the “J”
bend as either a washer or ground
joint union. It is important to
understand that sink traps do not
share precisely the same style of “J”
bend with the “P” and “S” traps,
however. The direction of the union
attachment is reversed on sink traps,
with the nut threading onto the

Question 14

what is important to know about J-bends?

Answer 14

There’s a different type of J-bend needed for P, S, and Sink traps

Question 15

What is the waste connection

Answer 15

The final
component in our linkage of the sink
to the waste line this part makes the transition
from the type of connections used
with tubular components to those
connections used with the waste line
of the DWV system.