Term
6-1 According to the Code, the private sanitary Irainage system does not include:
(a) the pipes installed within the wall line of a the pipes installed within the wall line of a building to receive waste substances in suspension
(B) the building sewer
(C) the pipe which conveys waste substances from a garbage-can wash
(D) the pipes installed to convey waste substances from area drains |
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Definition
Answer: D '
Code response: It is prohibited to drain storm water into sewers intended for sewage only .. |
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Term
6-2 According to the Code, the drainage system is sized by:
(A) the maximum fixture unit load
(B) the minimum fixture unit load
(C) the number of fixtures connected thereto
(D) a state-registered engineer |
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Definition
Answer: A
Code response: The maximum number of fixture units that may be connected to a given size of piping within the drainage system. |
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Term
6-3 According to the Code, when calculating the fixture unit load for a 30-unit apartment building - having 30 bathtubs with shower heads, the shower heads will:
(A) increase the total load by 15 fixture units
(B) increase the total load by 30 fixture units
(C) not increase the total fixture unit load value
(D) Increase the total load by 1/2 fixture unit when in use |
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Definition
Answer: C
Code response: A shower head over a bathtub will not increase the fixture unit load. . |
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Term
6-4 According to the Code, cast-iron no-hub pipe and fittings used in the installation of drainage and -- vent systems shall have the approved standards established by the:
(A) American National Standards Institute, Inc. (ANSI)
(B) American Society of Sanitary Engineering (ASSE) __
(C) American Society for Testing Materials (ASTM)
(D) Cast-Iron Soil Pipe Institute (CISPI) |
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Definition
Answer: D
Code response: Standards given in Table 703, Drainage System Materials, apply to the specific use of certain materials approved as each applies to the drainage system. |
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Term
6-5 According to the Code, a building sewer installed in filled or unstable ground shall be of:
(A) DWV schedule 80
(B) DWV copper-type L
(e) cast-iron pipe
(D) any approved metallic piping and fittings |
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Definition
Answer: C
Code response: A building sewer, when installed i~ filled or unstable ground, shall be of cast-iron pIpe. |
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Term
6-6 Fittings used in a PVC-type DWV drainage system shall:
(A) not be used where combustible construction is ( allowed
(B) conform to the type of pipe used
(C) be schedule 80 only
(D) be of the recessed type |
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Definition
Answer: B
Code response: Fittings on the drainage system shall conform to the type of pipe used. |
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Term
6-7 To meet Code requirements, a 2-inch-diameter waste pipe installed horizontally must fall a minimum , of _ inches every 35 feet.
(A) 5-1/8
(B) 6-5/8
(C) 7-1/4
(D) 8-3/4 |
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Definition
Answer:D
Code response: Horizontal drainage piping of 2-inch diameter shall have a minimum fall of 1/4inch per foot. |
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Term
6-8 According to the Code, _ must discharge their waste through a grease interceptor.
(A) garbage-can washers
(B) commercial food grinders
(C) garage floor drains
(D) acid waste systems |
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Definition
Answer: A
Code response: Garbage-can washers shall be connected through a grease interceptor . |
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Term
6-9 According to Code, horizontal combination waste-and-vent sanitary systems are limited to:
(A) water closets only
(B) floor drains only
(C) floor sinks only
(D) fixtures not adjacent to walls or partitions |
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Definition
Answer: D
Code response: Horizontal combination waste-and- ( vent sanitary systems are limited to fixtures not adjacent to walls or partitions and are limited to sinks, dishwashers, indirect waste receptors, floor drains or similar fixtures. |
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Term
6-10 According to the Code, the smallest pipe diameter for a soil stack that carries no waste from urinals or bedpan washers is _ inches.
(A) 2 .
(B) 2 1/2
(C) 3
(O) 4 |
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Definition
Answer: C
Code response: No water closet shall discharge into a stack unless it has a minimum diameter of 3 inches. |
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Term
6-11 A 4-inch-diameter building drain installed horizontally must have a minimum of _ fall per foot to -' meet the Code.
(A) 1/16-inch
(B) 1/8-inch
(C) 1/4-inch
(D) 1/2-inch |
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Definition
Answer: B
Code response: Horizontal building drains 4 inches in diameter or larger shall have no less than 1 IS-inch fall per foot. |
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Term
6-12 Fixture unit equivalents not commonly listed in fixture unit tables, according to Code, must be based '..!!J on the:
(A) type of fixture
(B) trap size
(C) location of fixture
(D) discharge capacity of fixture |
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Definition
Answer: B
Code response: The unit equivalent of fixtures not listed shall be based on the fixture trap size. |
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Term
6-13 Of the following drainage piping materials used within a building, the one prohibited by Code for underground installation is:
(A) DWV copper piping .
(B) lead piping
(C) steel piping
(D) brass piping |
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Definition
Answer: C
Code response: None. |
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Term
6-14 Fittings used within a drainage system, according to Code, must:
(A) be constructed of cast iron
(B) have a drainage pattern from horizontal to horizontal
(C) have a smooth interior waterway .
(O) have a drainage pattern of not less than 45 degrees |
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Definition
Answer: C
Code response: Fittings which offer abnormal obstruction to flow shall not be permitted in a drainage system. |
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Term
6-15 The minimum size vertical waste pipe required by Code for a service sink having a 2-inch diameter !!J trap is:
(A) 1 1/2 inches
(B) 2 inches
(e) 2 1/2 inches
(D) 3 inches |
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Definition
Answer: B
Code response: A trap shall not be larger than the waste pipe to which it is connected. |
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Term
6-16 Assume that waste is discharged from a building at a rate of 630 gallons per minute. The rate of flow , in terms of fixture units is:
(A) 62
(B) 76
(C) 84
(D) 108 |
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Definition
Answer: C
Code response: A lavatory is considered 1 fixture unit. A fixture unit flow rate shall be deemed 7.5 gallons of water per minute.
Note: Here's the solution: 630 gpm + 7.5 gpm = 84 |
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Term
6-17 Of the following factors. the one that is NOT!! required by Code for determining the size of a drainage pipe is:
(A) the grade of the piping
(B) the type of piping material used
(C) the type of fixtures used
(D) the length of run |
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Definition
Answer: B
Code response: This Code does not address this particular question as presented. |
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Term
6-18 The minimum sizes of horizontal drainage piping, according to Code, are determined by:
(A) the waste outlet size of fixtures connected thereto
(B) the number and type of fixtures connected thereto
(C) the length of run and pitch per foot
(D) the total of all fixture units connected thereto |
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Definition
Answer: D
Code response: The minimum sizes of horizontal drainage piping shall be determined from the total of all fixture units connected thereto. |
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Term
6-19 In the case of vertical drainage piping, the minimum sizes, according to Code, are determined by the total of all fixture units connected thereto, and by:
(A) any offsets in the stack
(B) their length
(C) the minimum vent piping size required
(D) the largest fixture opening at the highest level |
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Definition
Answer: B
Code response: The minimum sizes of vertical drainage piping shall be determined from the total of all fixture units connected thereto and, in addition, in accordance with their length. |
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Term
6-20 Where there is a continuous flow from an air-conditioning unit into a building drainage system, each gpm of flow, according to Code, must equal _ fixture units).
(A) 1/2
(B) 1
(C) 1 1/2
(D) 2 |
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Definition
Answer: D
Code response: For a continuous flow into a drainage system, such as from air-conditioning equipment, 2 fixture units shall be allowed for equipment, 2 fixture units shall be allowed for each gallon per minute of flow. |
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Term
6-21 Assume the flow from a pump ejector in a building is 66 gallons per minute. According to Code, this would add a total of _ fixture units to the building drainage system.
(A) 123
(B) 128 .
(e) 132
(D) 137 |
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Definition
Answer: C
Code response: A pump ejector shall be allowed 2 fixture units (F U) for each gallon per minute of flow.
Note: Here's the solution: 66 gpm x 2 F U = 132 F U |
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Term
6-22 Any part of a piping system that extends horizontally at an approved grade, with or without vertical extensions from the main to plumbing fixtures, is called a _ in the Code.
(A) lateral
(B) continuous pipe
(C) branch drain
(D) branch |
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Definition
Answer: D
Code response: A branch is any part of the piping system other than a main, riser, or stack. |
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Term
6-23 Any part of a drainage system that extends horizontally at a slope from a soil or waste stack, with or , without lateral or vertical extensions, on two or more floors, is defined by Code as a:
(A) horizontal branch
(B) horizontal pipe
(C) fixture drain
(D) combination fixture drain |
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Definition
Answer: A
Code response: A horizontal branch is a drain pipe extending laterally from a soil or waste stack, with or without vertical sections or branches. |
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Term
6-24 To connect a 3-inch vertical stack to a 4-inch horizontal drainage line, the acceptable fitting, by Code, - IS a:
(A) 4-inch by 4-inch by 3-inch sanitary tee
(B) 4-inch by 3-inch by 4-inch combination
(C) 4-inch by 3-inch by 4-inch sanitary tee
(D) 4-inch by 4-inch by 3-inch combination |
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Definition
Answer: D
Code response: Vertical stacks connecting to a horizontal drainage line shall be made by the appropriate use of a combination of (or equivalent fittings to provide a 45-degree branch. |
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Term
6-25 The fitting shown in Figure 6-1, according to Code, may be used in a drainage system:
(A) to provide a horizontal-to-vertical change of direction
(B) to provide a horizontal-to-horizontal change of direction
(e) both "A" and "B"
(D) none of the above |
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Definition
Answer: D
Code response:
A straight tee branch shall not be installed as a drainage fitting in a plumbing drainage system. |
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Term
6-26 The fitting shown in Figure 6-2, according to Code, may be used in a drainage system when the direction of flow is from the:
(A) horizontal to vertical
(B) horizontal to horizontal
(C) vertical to horizontal
(D) none of the above |
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Definition
Answer: A
Code response: Sanitary tees may be used in drainage lines where the direction of flow is from the horizontal to the vertical. |
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Term
6-27 The Code generally requires that piping with a high percentage of silicon be installed to convey:
(A) backwash waste from swimming pools
(B) waste containing acid
(e) waste from industrial plants
(D) waste from hospital operating rooms |
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Definition
Answer: B
Code response: Acid waste piping shall be constructed of a high-silicon cast-iron pipe. |
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Term
6-28 A 4-inch sewer pipe, according to Code, must have a fall no less than _ inches every 50 feet.
(A) 5.5
(B) 6
(C) 6.25
(D) 6.75 |
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Definition
Answer: C
Code response: Horizontal drainage piping 3 inches and larger shall be installed with a fall of not less than 1 IS-inch per foot.
ote: Remember that 1/8-inch is the same as 0.125 inch. HI O.125-inch per foot = 6.25 inches. |
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Term
6-29 Building sewer "A" in Figure 6-3 would have an accumulative fixture unit load value of _, accord ing to Code.
(A) 14
(B) 22
(C) 27
(D) 29 |
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Definition
Answer: C
Code response: Check fixture units per fixture, as listed in the fixture table. |
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Term
6-30 Building drain "B" in Figure 6-3 would have an accumulative fixture unit load value of , !J according to Code.
(A) 13
(B) 16
(C) 19
(D) 23 |
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Definition
Answer: D
Code response: Check fixture units per fixture, as Code response: Check fixture TAble. |
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Term
6-31 Building drain "e" in Figure 6-3 would have an accumulative fixture unit load value of , ----according to Code.
(A) 6
(B) 8
(C) 10
(D) 12 |
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Definition
Answer: B
Code response: Check fixture units per fixture, as listed in the fixture table. |
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Term
6-32 Using 1.6 GPF, the gravity tank water closets for soil stack D" in Figure 6-3 would have a cumulative fixture unit load value of ____, according to Code.
(A) 13
(B) 15
(C) 18
(D) 22 |
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Definition
Answer: A
Code response: Check fixture units per fixture, as listed In the fixture table. |
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