part 2

Question 1

There are two main methods which can be used for grading pipes:

Answer 1

9-inch level, Adjustable Grade Level

Question 2

A straight piece of wood 12 inches long with a 1/4 inch strip of wood attached to one
end can be used to set the 9-inch level on. A correct level reading will indicate that
the waist pipe or drain has grade of 1:50 (1/4 inch to one foot)

Answer 2

9-inch level

Question 3

This type of level is especially
designed for grading waste
pipes. It has an adjustable
level which can be moved to
the required grade and then
locked in place.

Answer 3

adjustable grade level

Question 4

connection of the upper end

Answer 4

termination

Question 5

can be connected to a vent stack:

Answer 5

fixtures

Question 5

vent pipes to the vent stack ):
“The upper end of every vent pipe shall be above the flood level rim of the highest
fixture it serves before connecting to another vent pipe.

Answer 5

connection

Question 5

Each vent pipe or stack through roof
(SVTR) shall extend its flashing all around and
the stack vent shall terminate vertically not less
than 15 cm above the roof nor less than 0.3
meter from any vertical surface nearby

Answer 5

vent termination

Question 5

the vent through roof (VSTR) shall be
increased 1 pipe size above the reconnection
point of stack vent and horizontal vent.

Answer 5

vent termination

Question 6

Every waste pipe shall be installed and back
vented at the same time

Answer 6

individual vent

Question 7

must be connected above the
horizontal center line of the fixture drain
(nominally horizontal soil or waste pipe );

Answer 7

back vent

Question 7

the maximum length of a fixture outlet pipe of any fixture is 900 mm”.
There is no minimum length requirements for a fixture outlet pipe. This means that
two different fixtures may be dual vented and connect at the same level with a
double Y and two 450 elbows.

Answer 7

dual vent

Question 7

Is a type of
group venting where one
vent protects two fixture
traps

Answer 7

dual vent

Question 7

The size of the vertical drainage piping serving
a dual vent is determined by the size of outlet
pipes of the dual vented fixtures and the total
fixture unit load.

Answer 7

drain pipe sizing

Question 8

A dual vent is sized as a branch vent
according to Section 910.

Answer 8

vent pipe sizing

Question 9

means a waste
pipe that also serves as
a vent pipe.

Answer 9

wet vent

Question 10

not more than 2 fixtures are
connected to the vent pipe:
and where 2 fixtures are
connected to the vent pipe, the
connection is done with
a

Answer 10

double fitting

Question 10

means a waste
pipe that also serves as
a vent pipe.

Answer 10

circuit vent

Question 10

arrangement of group
venting when fixture
traps are vented
through the soil stack
which terminates into
a header or open air
and no additional
venting is required.

Answer 10

stack vent

Question 11

means a stack venting
arrangement where the
stack vent above the
connection of the highest
stack vented fixture is
reduced in diameter.

Answer 11

modified stack vent

Question 12

means a vent pipe
that is connected at its lower
end to a soil or waste stack and
its upper end to a vent stack or
a branch vent that is connected
to a vent stack.

Answer 12

yoke vent

Question 13

offer a substitute for
running vent pipes to the outside of
buildings. These valves open automatically
to let fresh air into the sanitary system if
there is a decrease in air pressure within
the system. The valves close automatically,
to avoid the discharge of foul air, whenever
the pressure in the system is equal to or
greater than the external pressure.

Answer 13

air admittance valve

Question 13

Its purpose is to maintain
atmospheric pressure in the
soil, waste and vent stacks

Answer 13

yoke vent

Question 14

You can use air admittance valves for:

Answer 14

trap vent, group vent, stack vent, branch drain