Among the most common and serious problem being

encountered in a drainage system is the ____.

_____ can be attributed to inadequate ventilation

of the trap and the subsequent minus and plus pressures

inside the system.

_____ is the result of minus pressure in the drainage system. If the trap of a common seal is open and exposed to the atmosphere, both the inlet and the outlet orifices will be under balance atmospheric pressure. As such, the tendency of water seal to move is remote.

When the water seal escape from

the P-trap, it is called ____

_____ occur in unventilated traps ,which serves as oval bottom fixtures like lavatories or slop sink. Self siphonage is created when a rapid flow of water passing through the pipe siphon down the water seal inside the traps with no vent provision.

____ is the result of a minus pressure in the pipe created by heavy discharge of water from a fixture installed on a line serving another fixture at a lower floor.

_____ is caused by plus pressure. When large

amount of water flow drops downward rapidly forming a

slug like, the air inside the pipe will be compressed

downward.

In the absence of adequate ventilation, the

compressed air will be forced to find its away out through a weaker point. The trap seal being the weakest point, will give way and blow out of the fixture

This process is considered a minor problem and is less probable to drain the water inside the trap.

however, happen only on floor drain which are not regularly used to admit water, but exposed to extreme temperature.

A wind velocity passing over the top of

the soil pipe may affect the trap seal. This kind of trap seal

loss is one improbable thing to happen by removing the

entire water seal inside the P-irap.

This kind of trap seal loss also seldom happen and is rarely experienced by homeowners.

this action is draining of the water seal caused by foreign objects like thread or string suspended and extended over the outlet arm of the trap.

The vent pipe used to ventilate the soil and waste

pipes are the _____

The main vent and other subsidiary form of relief vents, are classified according to the functions they perform, and they are called _____

This type of ventilation, only serve the fixture trap indirectly. Their main function is to maintain the balance atmospheric pressure inside the waste pipe system.

“ All roof exiensions of soil or waste stack shall run full

size at least _____ above the roof and when the

roof is used for other purposes than weather protection,

such extension shall not be less than _____ the

roof... the roof terminal of any stack or vent, if within 3.00

The main vent is that potion of the vent pipe system,

serving as terminal for the smaller forms of individual and

grouped fixture trap ventilation. It is sometimes referred to

as______

The_____ is a combination of waste pipe,

vent pipe, and water supply. The efficiency of one is dependent on the other.

Individual vent is sometimes referred to as _____.

It is that portion of the vent pipe system that serves as a single trap. It is connected closer to the trap directly underneath and back of the fixture, and reconnected into the main vent above the overflow line of the fixture it serves.

So far, _____, is the most effective means

of venting fixture trap to prevent minus or plus pressure.

No trap seal shall be placed more than _____

horizontal developed length from its vent.

The vent opening from the soil or waste pipe, except for _____ and similar fixtures, should not be the dip of the trap.

individual vent for

individual vent for

“No vent shall be less than 38 min (1 1/2") diameter except for a 32 mm (1%") diameter _____.

The vent pipe shall be of the same diameter size as the waste pipe, and in no case must a branch or main vent have a diameter less than 1/2 that of the soil or waste pipe served, nor shall the length of a branch vent of given diameter

exceed the maximum length permitted for the main vent

serving the same size of _____.”

the vent pipe must rise vertically or at angle ___ to the vertical up io the point of 15 centimeters above the fixture it is venting before offsetting

horizontally or connecting to the branch main waste or

soil vent”

is defined as; that portion of a vent pipe system that ventilates two fixture traps that discharges into a sanitary cross with deflectors.

It is classified as another form of individual vent, with identical form of back venting, having the same principles in functions. This type of venting is common to fixture trap serving apartment and hotel toilet particularly, on fixtures with identical position and measurements.

_____ is employed where two or more

fixture traps are installed on a horizontal soil or waste

branch. Generally, the use of circuit vent reduces the cost

of plumbing installation. This type of ventilation is com-

monly used in buildings with more facilities, and battery

of fixtures.

On Circuit Vent for a battery of water closets, the

Code says that:

“No more than 8 water closets or other

fixtures shall be allowed on any circuit or loop vent. If

there are 14 or 16 water closets which are to be vented,

two pieces of ____ pipe should be installed.”

For Circuit or Loop Vents, the Code also provides that:

Circuit or Loop Vent is permitted provided that a branch

soil or waste pipe to which two and not more than ______, pedestal urinals, trap standard slop sinks, or shower stalls are connected in a series, may be vented by

a circuit or loop vent, which should be taken off in front of

the last fixture connection.

_____ is installed to ventilate the soil and waste

pipe and the connecting branches rather than the fixture traps.

Waste branches which are circuit vented, shall be

provided with ____

The base of the soil stack on tall building installation is susceptible to back pressure, due to the large volume of water rushing down inside the pipe.

Hence, a ____ in this portion of the installa-

tion is necessary.

may be installed at interval on the soil

pipe having changes in directions.

On long vertical soil pipe, a Relief Vent is installed

at 3 to 5 floor intervals. In this manner of installation, the relief vent is sometimes referred to as

_______

Relief Vent serving a circuit vented branch, should

have at least _____the diameter of the said

soil pipe, but in no case, be less than 38 mm diameter.

For instance, if the soil pipe is 100 mm. the

relief vent is____ but in no case, be less than 38

mm diameter.

Yoke Vent between the main vent and the soil pipe

at 5 floor intervals must have equal pipe diameter,

as the ____.

_____ is one type of ventilation use on fixtures

in a room away from partitions. This is common to beauty parlor, barber shop, dental clinic and operating room. The use of looped vent is not practical, but sometimes tolerated, only when other methods of ventilation could not be

possible.

The size of looped vent is also determined in the same manner as that of the ____.

is defined as that portion of the vent-pipe system where liquid waste regularly flows.