SEMI FINALS Flashcards
1
Q
Is that portion of the plumbing system that receives discharges of all soil and waste stacks within the building, and conveys the same to the house sewer
A
House drain
2
Q
Sometimes referred to as the Collection Line of a Plumbing System
A
House drain
3
Q
It can be installed underground, or maybe suspended below the floor or inside the ceiling.
A
House drain
4
Q
In large building, it is usually suspended from the basement ceiling to avail of the gravity flow of waste to the main sewer.
A
House drain
5
Q
House drain may be classified into four types
A
- Combine drain
- Sanitary drain
- Storm drain
- Industrial drain
6
Q
Is a type of house drain that receives discharges of sanitary waste as well as storm water
A
Combined drain
7
Q
The oldest form of house drain when public sewers are of the combination design
A
Combined drain
8
Q
The type of house drain that is already phase out and no longer permitted
A
Combined drain
9
Q
This type of house drain receives the discharges of sanitary and domestic waste only.
A
Sanitary drain
10
Q
The waste is conveyed to a public sewer, or septic tank, by the house sewer.
A
Sanitary drain
11
Q
Storm water is not allowed in this drain
A
Sanitary drain
12
Q
Is a house drain that receives discharges from industrial equipment that contain some objectionable acid wastes.
A
Industrial Drain
13
Q
_____ that contains acid waste terminates into a separate drainage basin
A
Industrial drain
14
Q
Conveys all storm clear water, or surface water waste except sanitary wastes.
A
Storm drain
15
Q
It terminates into lake, river, dry run, or natural basin
A
Storm drain
16
Q
Is the most practical method to use in determining the size of a house drain
A
The Unit System
17
Q
It has been formulated from tests conducted by the Uniform Plumbing Code Committee, a body consisting of representatives of management, labor and government standard agencies
A
The Unit System
18
Q
Washbasin being the smallest type of plumbing fixture, would discharge waste approximately ____ in one-minute interval. Volume was found out to be closely one cubic foot of water
A
7 and 1/2 gallons
19
Q
The Code Committee has finally decided to adopt the washbasin discharge as
A
One Fixture Unit
20
Q
One fixture unit represents ____ of water
A
30 liters
21
Q
On house drain, the Plumbing Code provides that no water closet shall discharge into a drain less than
A
75 mm or 3 inches pipe diameter
22
Q
On house drain, the Plumbing Code provides that no more than two water closets shall discharge into any _____ horizontal soil branch, house drain or house sewer
A
75mm
23
Q
The house drain being a _____ must produce the necessary velocity and discharge capacity at a certain inclination, to attain scouring action
A
Horizontal pipeline
24
Q
It must function without abnormal or subnormal pressure in the plumbing system
A
House drain
25
Less than 2% slope is adopted when the depth of the sewer line in relation with the depth of the basement floor is
low
26
Less than 2% slope is adopted when long sewer line would require lower pitch but should not be less than
1%
27
Less than 2% slope is adopted in case the sewer line slope is very slight, installation of the pipe should be guided by leveling instrument for accuracy to prevent
Sags or trapped piping
28
The distance between the house sewer and the elevation of the basement
Total pitch
29
Grade or slope of the house drain could be estimated by dividing ___ in centimeters by the length of the _____ in meter
Total pitch (cm)
Longest branch (m)
30
A pitch or slope more than 2% will increase the _____ and _____ capacity of the pipe
velocity and discharge
31
Greater than 2% slope is a danger that it might _____ the depth of the water that is necessary to create a scouring action
decrease
32
Greater than 2% slope might cause a _____ if the drain is over loaded to a flow capacity
minus pressure
33
All changes in directions of house drain from horizontal to horizontal, or vertical to horizontal flow, should be done with
Long radius fittings
34
What should not be permitted in changes in directions of house drain
Short tees, 1/4 bends, and short turn L fittings
35
Soil branch should be run ____ to the main
Right Angle
36
_____ must run at right angle to the branch
Fixture connection
37
The house drain shall be provided with adequate number of cleanouts to prevent breaking of the floor, in case of
drain stoppage
38
The location of the _____ depends upon the good judgment of the plumber where it is readily accessible, in case of line trouble
cleanout
39
Any branch of the house drain terminating at a floor drain or fixture, shall be provided with ____, extended at least ____ above the floor inserted in a ______ Y branch in the direction of the drain flow
100mm diameter pipe
2 inches
45 degrees
40
The cleanout shall be equipped with _______ provided with a raised head that could be removed easily with a wrench
threaded screw cover
41
A cleanout extended above the floor, shall not be utilized as a
floor drain
42
The trap of a floor drain shall be placed not more than ____ below the finished floor line, to facilitate cleaning in case of line trouble
50 centimeters
43
A cleanout shall be installed at every ____ interval distance, and also at the base of all soil and waste stack
20 meters
44
What are the house drain appliances
1. House Trap
2. Area Drain
3. Floor Drain
4. Yard Catch Basin
5. Garage Catch BAsin
45
Things under House Trap
a. House trap assembly
b. Back flow valves
c. Balanced valve
d. Unbalanced valve
46
Garage Catch Basins includes
a. Drain tile receptor
b. Sewage ejector
c. Automatic water siphon
d. Sump pit
e. Grease basins
47
Is defined as a device installed in the house drain immediately inside the foundation wall of the building
House Trap
48
It serves as a barrier and prevents the gases coming from the public sewer or septic tank in circulating through the plumbing system
House Trap
49
Considering the different gases being produced inside the public sewer and septic tank, Sanitary Authorities advocating for the use of ____ that is installed on the house drain
house trap
50
Is a device used in a drainage system to prevent the reversal of flow.
Back Flow Valve
51
It is installed in a house drain or branches of the house drain that are subjected to reversal flow of liquid.
Back Flow Valve
52
Is installed on the house drain, just near the foundation wall or near the toilet room under floor
Back Flow Valve
53
It is set in a level position to attain its full effectiveness
Back Flow Valve
54
Two patterns of Back Flow
1. The Balance Valve
2. The Unbalanced Valve
55
Is the most preferred patterm of back flow, because it has the characteristics of non-interferences in the movement of air inside the drainage system.
The Balance Valve
56
The interior mechanism consists of a brass-seat into which fitted a gate counter balanced with an adjustable cast iron weight
The Balance Valve
57
Similar to balanced valve, but is not preferred because of its recorded poor performance in the past
The Unbalanced Valve
58
The _____ assembly consists of a running trap installed under the basement floor to protect it from freezing.
Area drain
59
The trap is equipped with a cleanout
Area drain
60
The minimum size of an area drain is _____ to drain basement entryways, loading platforms, or driveways
10 mm or 4'' pipe
61
Is defined as; a receptacle used to receive water to be drained from the floor into the plumbing system
Floor drain
62
Sanitary Authorities recognized this as plumbing fixture properly designed and located where to receive liquid floor waste
Floor Drain
63
An average residence is provided with ____ floor drains
two
One located near the heating equipment, and the other in the vicinity of the laundry.
64
In most instances, one floor drain is provided to serve the entire
basement
65
Every room where laundry equipment is used, shall be provided with adequate
Floor drain
66
It must be located where the overflowing water will not travel a great distance over the floor before it enters the drain
Drain proper
67
It is recommended that the floor drain be located at one end of the
laundry tub
68
Every floor drain shall be supplied with _____ from a fixture located nearby.
Running water
69
If the fixture is less than ____ from the drain, it should be tapped but not necessarily vented
1.50 meters
70
It should be connected to the house side and never to the sewer side of the trap, which supply water to a floor drain
Fixture drains
71
One of the causes of water on the floor is the presence of ____ accumulated inside the P-trap
sand and other objectionable wastes
72
Installing a _____ P-trap is too small for a human hand or tools to clean
50mm or 2inches
73
Problem occurs when P-trap installed might have been too _______ despite of its being small in size
below the floor line
74
The plumbing layout as _____ must be kept for future reference in case of trouble, otherwise hit and miss repair would be very difficult and costly
Built-in Plan
75
Plumber should not install P-trap smaller than ____ on floor drain
75mm diameter
76
Is usually installed on basement floor, near the heating equipment, below the kitchen sink, and vicinity of the laundry
Floor Drain
77
_______ P-trap is recommended minimum size for floor drain. It should be installed not more than ______ below the floor line
75 mm or 3''
20 centimeters
78
It should be deep seal type
P-Trap
79
The _____ P-trap is commonly used as floor drain
Low inlet hub pattern
80
Shall connect into a trap so constructued that it can readily be cleaned and of a size to serve the purpose efficiently for which it is intended
Cellar or basement floor drains
81
When subjected to back flow pressure, such drains shall be equipped with an adequate ____
Back Flow Valve
82
Is defined as a receptacle used to catch surface water drained from cemented courts, driveways, and yards
Yard catch basin
83
It could be a terminal for drain tile installations used to drain water from athletic fields
Yard Catch Basin
84
Is a device designed to convey wastes from garage, wash rack, grease pits, and repair floors into the house drain.
Garage catch basin
85
Wastes coming from these areas contain objectionable elements like grease, oil, grit and gasoline that are detrimental to the drainage installation as well as the sewage disposal system
Garage catch basin
86
Oil and grease adhere to the ______ used in the treatment of sewage
Mechanical devices
87
Its function is to retain these noxious materials and discharge the associated water into the house drain
Garage basin
88
Use this to overcome stoppage in plumbing system cause by grease and oil
Grease Basins
89
It shall be installed as close to the fixtures as possible
Grease trap
90
More than one fixture can be discharge into the same trap, provided that the waste pipe is not very long and the trap has sufficient size
Grease trap
91
A _____ placed on the ground is earth cooled.
Grease trap
92
Is used on large installation and is most desirable type in installing the grease basin
Earth-Cooled Grease Trap
93
The grease basin width should not be less than ______
60 centimeters
94
The length of greese basin should be from ______ its width to attain smooth and non-agitated flow
3 to 4 times
95
The minimum depth of concrete grease trap should not be less than ______ below the outlet invert
120 cm
96
The size of a grease trap is measured through the ______ to be discharge
volume of fixture unit
97
Grease trap could be sized according to the number of meals served estimated at ________ capacity for each meal
4 to 5 gallons
98
They estimated double the actual volume of waste to which the grease trap will serve
Experienced sanitarians
99
Is defined as, that portion of the horizontal drainage system, which start from the outer face of the building and terminate at the main sewer in the street or septic tank.
House Sewer
100
Portion of the horizontal drainage system, which starts 90cm from the outer face of the building
House Sewer
101
House sewer is sometimes called
Building Sewer
102
Is financed and maintained by the government
Main Sewer
103
Those houses along the street with main sewer line are required to connect their house sewers to the
Public sewer line
104
Efficiency of a drainage installation depends upon the performance of the
house sewer
105
The house sewer is connected to the main sewer by boring a small hole through the concrete pipe, using a
sharpened steel chisel or electric drill
106
The house sewer pipe is connected to the main sewer entering at _____ or directly from the top
45 degrees angle
107
Secure permits from the
sewerage authority
108
The depth is found by measuring the length of the _____ of the house drain multiplied by the pre-planned ______ per meter
longest branch
pitch
109
Add the required ______ ground coverings from the top of the concrete floor or _____ of ground covering without concrete floor
30cm
40cm
110
The grade of the house sewer could be found through the difference between the
House sewer and the depth of the main sewer
111
Additional grade can be made with the use of _____ considered as the most practical method of establishing grade
1/8 bend
112
The old practice of the size of house sewer is to use _______ diameter cement or ________ pipe for house sewer
150mm or 6 inches
vitrified clay
113
If plastic pipe or its interior surface texture equivalent is used, the diameter can be reduce to ____
100mm diameter
114
Is that unit of the plumbing system that conveys rain or storm water to a suitable terminal
Storm drain
115
It is not permitted to discharge into a septic tank or to the main sewer line
Storm Drain
116
Problem of storm water will create a settlement of the structure cause by _______ or washing away the soil from the foundation
erosion
117
Problem of storm water will subject the basement floor and walls to unnecessary _________ and possible leakage
ground water pressure
118
Problem of rundown water may create walls and window _____
leakage
119
Problem with water coming from roof may _______ water on people passing by or approaching entry door
spill
120
Problem with water coming from the roof will ____ the surrounding grounds and cause disfiguring of the landscape areas
Erode
121
The trend is to provide a _______, to serve not only the commercial and industrial establisments, but also residential houses in disposing off storm water
storm sewer line
122
Is a collector of water coming down from the downspout leading the accumulated water away from the house at a relatively low rate of flow
Splash pan
123
3 classification of storm drain
1. The Inside storm drain
2. Outside storm drain
3. Overhead storm drain
124
Is sometimes located under the basement floor or within walls of the building
Inside storm drain
125
This type of storm drain is commonly found in buildings constructed along congested business district, or building that occupies the entire frontage of the lot.
Inside storm drain
126
Is installed outside the foundation wall of the building.
Outside Storm Drain
127
This type of drainage is possible on location where the lot is not totally occupied by the building.
Outside storm drain
128
Is adopted when the street drainage is higher in elevation that the basement floor of the building
Overhead storm drain
129
The pipe is well fitted and suspended inside the ceiling by suitable hangers spaced at closer intervals
Overhead storm drain
130
The size of storm drain is determined by gauging the rainfall over a given period, whether it is constant or exceedingly heavy shower of ___
short duration
131
Water drain faster on a _____ roof, thus required a larger drainage pipe than that of a flat roof
high pitch
132
The _____ of the building contribute largely to the velocity of water falling inside a vertical pipe conductor
height
133
The use of _______ will affect the flow of water
improper fittings and short offsets
134
The conservative estimate of maximum rainfall in the Philippines is about _______ interval
20mm in a 5 minutes
135
A combination of ____ fitting is appropriate for any change in direction
Y and 1/8 bend or long radius
136
Is popularly known as water conductor or downspout either concealed or exposed type
Roof Leader
137
Is a device scientifically designed to prevent the back flow of gases coming from the septic tank or sewer line passing through the outlet of the fixture
Trap
138
These gases are identified as _________ considered dangerous to human health
Hydrogen
Hydrogen Sulfide
Methane
Carbon Dioxide
Carbon Monoxide
139
The basic function of the trap in a drainage system is to prevent those ____ from entering the plumbing system
objectionable gases
140
Tests of traps showed that, the most practical form ever developed is the
P-Trap
141
Originally, this P-trap was called ______ attributed to its form like the neck of a goose
Gooseneck
142
The column of water that is retained between the overflow and the dip of the trap is called
Trap Seal
143
Trap Seal is sometimes referred to as
Water Seal
144
Water sealed P-trap is classified into two
The common seal
The deep seal
145
It has 5 cm deep water seal between the overflow and the dip, that will offer resistance against abnormal conditions, only to the amount of pressure a 5cm water will develop
Common Seal P-trap
146
Has from 7.5 to 10 cm column of liquid content between the overflow and the dip
Deep Seal P-Trap
147
This trap may be used under normal condition, but it is purposely design for abnormal conditions
Deep Seal P-Trap
148
Deep Seal P-trap is designed for abnormal situations such as
a. Extreme heat condition in the area
b. Increase and decrease of atmospheric condition
c. Circumstances where total ventilation cannot be obtained
149
One advantage of the Deep Seal over the Common Seal is its
Greater resealing quality
150
Is a term used to the scientific principle that water at rest tends to seek a level and maintain it
Re-seal
151
When the liquid content of a deep seal is disturbed, the water tends to ______ sufficiently to seal the trap even partially.
level itself
152
The P-trap is the most common and practical shape available in various sizes from _______
32mm to 50mm diameter
153
P-trap (32-50mm diameter) are used for these fixtures
1. Lavatories
2. Sinks
3. Shower bath with less amounth of water discharge
4. Urinals
5. Drinking fountain
154
Various forms of water sealed trap classification
Permissible Traps
Objectionable Traps
155
Types of Permissible Traps
Stand trap
High Hub trap
Low Hub
Extra Heavy Type
Brass trap
Sink or Lavatory Type
156
The Permissible Type of Traps
P-trap
Drum-Trap
157
Objectionable traps that are found defective
1. The full size S and the 3/4 S traps
2. The bag traps
c. Mechanically sealed traps
4. Light Metal partition traps
158
All traps shall be ____. That is, capable of being completely flushed each time the trap operates and no sediments will remain inside to decompose
self-cleaning
159
P-trap shall be installed as near the fixture as practical not to require ______ between the trap and the fixture proper
too long vertical leg
160
It eliminates high velocity of water discharge that creates siphone, the major cause of trap seal loss
Short vertical leg
161
P-trap shall be installed within _____ of fixture it serve.
60 cm
162
P-trap shall be acceddible for cleaning through the botton opening closed by a
screw plug
163
All traps are subject to stoppage, hence, shall be provided with ____ so designed that could be assembled and disassembled with little efforts
cleanout
164
Could be used only near the drain of the floor area or yarn
Long Run Horizontal Pipe
165
Long Run Horizontal pipe is also called ____ not provided with hand-hole cleanout
Running Trap
166
The dip portion of the trap shall be as short as possible to avoid
retarded flow of water
167
The horizontal leg connection to the waste pipe shall be reasonably short for _____
effective ventilation
168
___ from fixture shall be connected to the inlet side of the trap
Overflow pipe
169
Two laundry trays and a kitchen sink connected to a
single trap
170
Not more than ____ using one trap
3 laundry tray
171
_____ on a single trap
3 lavatories
172
Is also classified as water seal device, name was derived from its size being large in diameter
Drum Trap
173
Drum trap is intented for fixtures that are set on the floor like
Bathtub
Foot and sitz bath
174
Drum trap is used on fixtures that discharges substantial amount of water, effective where _______ is more prevalent due to the velocity of the flow in short interval
trap-seal loss
175
Drum trap can also serve as terminal for ____ and any type of indirect waster
soda fountain
bar wastes
176
2 types of drum trap
100mm x 125mm
100mm x 200mm
177
Advantage of drum trap where greater amount of water may pass through it in a short interval without the danger of
trap seal loss
178
It has a higher resealing quality than the P-trap
Drum trap
179
Disadvantages of drum trap
1. It is large and cumbersome
2. It is unsightly if the installation is exposed to view
3. Cleanout cover mechanism is above the water seal
4. To clean the drum trap needs lubricant and a fiber washer at the joint between the cover and the body of the trap
180
Each fixture shall be separately trapped by a water sealed trap placed as possible to the fixture except that a set of similar fixture consisting of not more than 3 wash basins
Traps where required
181
Like fixtures in residential houses, apartment and private bathroom of hotels and similar installation
Class 1 - For Private Use
182
Applied to fixtures in office buildings, factories, dormitories ang the like, for occupant's use only
Class 2 - For Semi-Public Use
183
such as schools, gymnasiums, hotels, railroad and bus terminals, public comfort rooms, and other installation where several fixtures are installed for unrestricted use
Class 3 - For Public Use
184
Continued discharge of greasy wastes reduces the
diameter of the pipe
