Traps & Interceptors Flashcards
1
Q
a fitting that provides a liquid seal which prevents backflow of foul air
A
TRAP
2
Q
that portion of a fixture drain between a trap and vent
A
TRAP ARM
3
Q
maximum vertical depth of liquid that a trap will retain
A
TRAP SEAL
4
Q
vertical distance between the dip and the crown weir of trap
A
SEAL
5
Q
connects the outlet of a plumbing fixture to the trap
A
TAILPIECE
6
Q
retains grease from 1 to 4 fixtures
A
GREASE TRAP
7
Q
separates and retains deleterious, hazardous or undesirable matters
A
INTERCEPTOR (CLARIFIER)
8
Q
at least 3 cu.m serving one or more fixtures and which is remotely located
A
GREASE INTERCEPTOR
9
Q
maximum no. of trap permitted on a trap arm
A
1
10
Q
1 trap may serve _____ single compartment sinks or laundry tubs of the same depth, or _____ lavatories immediately adjacent to each other with their waste outlets ______ apart and the trap is ______ located
A
3; 3; 0.75 m; centrally
11
Q
the vertical distance between a fixture outlet and the trap weir shall be _______
A
as short as possible
12
Q
maximum length of tailpiece
A
0.60m
13
Q
Developed length of trap arm is measured from _______
A
trap weir to the inner edge of vent
14
Q
minimum developed length of trap arm
A
2x the diameter of trap arm
15
Q
a change in direction of trap arm which __________ does not require cleanout
A
does not exceed 90°
16
Q
a change in direction of trap arm greater than ________ is required at the bend for trap arms 76mm in diameter and larger
A
22 1/2°
17
Q
What is the maximum distance to vent of a 32mm diameter trap arm?
A
0.76 m or 2.5 feet
18
Q
what is the maximum distance to vent of a 38mm diameter trap arm?
A
1.07 m or 3.5 ft
19
Q
what is the maximum distance to vent of a 51 mm diameter trap arm?
A
1.52 m or 5 ft
20
Q
what is the maximum distance to vent of a 76 mm diameter trap arm?
A
1.83 m or 6 ft
21
Q
what is the maximum distance to vent of a 102 and larger diameter trap arm?
A
- 05 m or 10 ft
22
Q
what is the maximum developed length between trap of water closet from top of closet ring to inner edge of vent ?
A
1.8 m
23
Q
Each trap, except interceptors, shall be __________
A
Self-cleaning
24
Q
What is the thickness for exposed and readily accessible drawn brass tubing trap, excluding urine?
A
Gauge 17 B&S or 1.1 mm
25
What is the maximum number of **slip joints** on the **outlet side of a trap**?
1
26
what is the depth of **water seals** for traps?
51 mm to 102 mm (2"-4")
27
What is the depth for **Common Seal P-trap**?
5 cm (2")
28
What is the depth of water seal for **Deep Seal P-trap**?
7.5 cm to 10 cm (3" to 4")
29
What is a trap with **5 cm (2")** deep water seal?
common Seal P-trap
30
what is a trap with **7.5 cm to 10 cm (3" to 4")** deep water seal?
Deep Seal P-trap
31
what is the trap used for **extreme heat conditions**, for turbulent atmospheric condition, and where total ventilation cannot be obtained?
Deep Seal P-trap
32
what is a trap intended for **fixtures set on the floor** (like bathtub, foot and sitz bath) and allowed only when permitted by authority?
DRUM TRAP
33
What trap is prohibited to use?
A. Stand trap
B. Crown trap
C. Low Hub
D. Extra Heavy
B. crown trap
34
what **protection** is used for drains or traps subject to **infrequent use**?
TRAP SEAL PRIMER
35
an **automatic device** that injects a small amount of water into the trap every time there is **pressure drop** in the system
TRAP PRIMER
36
what term is use when water Seal escapes from the p-trap?
TRAP SEAL LOSS
37
_______ is the results of **minus pressure** in the drainage system
SIPHONAGE
38
___________ occurs in **unventilated traps** which serves as ovaI bottom fixtures like lavatories and slop sink. It is created when a rapid flow of water passes through the pipe and siphons down the water seal inside the trap with no vent provision
DIRECT SIPHONING OR SELF SIPHONING
39
___________ is the result of **minus pressure** in the pipe created by **heavy discharge of water** from a fixture installed on a **line serving another a fixture at a lower floor**
INDIRECT OR MOMENTUM SIPHONING
40
__________ is caused by **plus pressure**. When a **large amount of water flow drops downward rapidly** forming a slug like, the **air inside the pipe will be compressed downward**
BACK PRESSURE
41
_________ is a minor problem and less probable to drain water inside the trap. This happens on **floor drains not regularly used to admit water.**
EVAPORATION
42
_________ is the wind velocity passing over the top of the soil pipe that may affect the trap seal
WIND EFFECT
43
__________ is the draining of water seal **caused by foreign objects like thread or string suspended**
CAPILLARY ACTION
44
What is the maximum fixture unit for a **32mm diameter** trap pipe?
1 FU
45
What is the maximum fixture unit for a **38mm diameter** trap pipe?
3 FU
46
What is the maximum fixture unit for a **51mm diameter** trap pipe?
4 FU
47
What is the maximum fixture unit for a **76mm diameter** trap pipe?
6 FU
48
What is the maximum fixture unit for a **102mm diameter** trap pipe?
8 FU
49
What is the diameter of trap pipe for **1 FU**?
32 mm
50
What is the diameter of trap pipe for **2 FU**?
38 mm
51
What is the diameter of trap pipe for **4 FU**?
51 mm
52
What is the diameter of trap pipe for **6 FU**?
76mm
53
What is the diameter of trap pipe for **8 FU**?
102mm
54
________ are needed for fish, fowl, and animal slaughter, meat packaging on curing establishments, etc.
INTERCEPTOR
55
Each **interceptor or clarifier** shall be **readily accessible** ________
without ladders
56
_______ may be installed in restaurants, cafes, lunch counters, hotels, factory or school kitchens, etc.
GREASE TRAP
57
what is the rate of flow of individual grease trap?
1.3L/s to 3.4L/s
58
________ shall be installed in the visible location such as the fixture's tailpiece on drain outlet connected to grease trap.
FLOW CONTROL
59
What is the maximum fixtures to be discharged into 1 grease trap?
4 fixtures
60
What is the maximum horizontal distance between the fixture outlet and the grease trap?
1.2m
61
What is the depth of **water seal for grease trap**?
51 mm
62
What is the maximum **vertical tailpiece** or drain between fixture outlet and the grease trap?
0.75 m
63
What is the required **rate of flow** for a grease trap with a retention capacity of **18 kg**?
76 L/m
64
What is the required **rate of flow** for a grease trap with a retention capacity of **23 kg**?
95 L/m
65
What is the required **rate of flow** for a grease trap with a retention capacity of **32 kg**?
132 L/m
66
What is the required **rate of flow** for a grease trap with a retention capacity of **45 kg**?
189 L/m
67
What is the grease retention capacity required for a **76 L/m** rate of flow?
18 kg
68
What is the grease retention capacity required for a **95 L/m** rate of flow?
23 kg
69
What is the grease retention capacity required for a **132 L/m** rate of flow?
32 kg
70
What is the grease retention capacity required for a **189 L/m** rate of flow?
45 kg
71
How many **fixtures** can an **18 kg** grease retention capacity carry?
1
72
How many **fixtures** can a **23 kg** grease retention capacity carry?
2
73
How many **fixtures** can a **32 kg** grease retention capacity carry?
3
74
How many **fixtures** can a **45 kg** grease retention capacity carry?
4
75
___________ are required whenever the discharge may contain **solids-heavier than water** that we be harmful to drainage system
SAND INTERCEPTOR
76
___________ floor drains may discharge into 1 sand interceptor
MULTIPLE
77
What is the minimum inlet and outlet pipe size for sand interceptors?
76 mm (3")
78
What is the minimum number of **baffle openings** for sand interceptor?
2
79
what is the minimum dimension of inIet section of sand interceptors?
0.2 sqm
80
what is the minimum depth under the invert of the outlet pipe for sand interceptors?
610mm
81
the outlet section of the sand interceptor shall have a minimum area of _______ of the inlet section
50%
82
What is the depth of **water seals for interceptors for sand** and similar heavy solids?
152 mm
83
what is the minimum compartments for interceptors?
2 compartments
84
where should interceptors be located?
as close to source as possible
85
**No individual grease trap** shall be installed for a facility that has an approved rate of flow of ______
1.3 L/s - 3.4 L/s
86
Any **equipment connected to a grease trap** shall be provided with an approved type ______
Flow control or restricting device
87
The total capacity of fixtures discharging into such grease trap shall not exceed _____ the certified liters per minute flowrate of the grease trap
2 1/2
88
Grease trap shall have a water seal of ______ whichever is greater
51mm depth or equivalent to its outlet diameter
89
How many floor drains may discharge into one sand interceptors?
Multiple floor drains
90
How many sand interceptors can multiple floor drains discharge into?
One
91
Sand interceptors shall be built of what materials?
Brick or concrete
Prefab coated steel
Other watertight material
92
The interceptors shall have an interior baffle for full separation of the interceptor into ______
2 sections
93
How much is the size of outlet pipe for oil interceptor?
Same size as the inlet pipe
94
What is the minimum inlet and outlet pipe size for oil interceptors?
76 mm
95
How many opening shall interceptor baffles have?
2 openings
96
The openings in interceptor baffles shall be _____ so that there cannot be a straight line flow between any inlet and outlet pipe
Staggered
97
Area of sand interceptor is to be increased by 0.09 sqm for each ________
18.9 L/m - 75.7 L/m
98
For each 18.9 L/m flow or fraction thereof over 75.7 L/m, the area of sand interceptor inlet section is to be increased by ______
0.09 sqm
99
What is the minimum area of the outlet section of a sand interceptor?
1/2 or 50% of the inlet section
100
The outlet section of a sand interceptor shall be covered by ______ set flush with the finished floor
Solid removal cover
101
The inlet section of a sand interceptor shall have ______ set flush with the finished floor
Open grating
102
The inlet section of a sand interceptor shall have ______ set flush with the finished floor
Open grating
103
A term used to the scientific principle that **water at rest tends to seek a level and maintain it**
RE-SEAL
104
Type of trap used in fixtures that discharges **substantial amount of water** intended for **fixtures that are set on the floor** like bathtub, foot and sitz bath, and other similar fixtures
DRUM TRAP
