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Residential Plumbing Inspector (CAP)
Lesson 2
Utilities
Base on 2014 OPSC
1 Updated: June 2015
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Sewers
305.0 Every building in which plumbing fixtures are
installed shall have a connection to a public or
private sewer.
308.0 Except as otherwise provided in this code, no
plumbing system, drainage system, building sewer,
private sewage disposal system, or parts thereof shall
be located in any lot other than the lot that is the site
of the building, structure, or premises served by such
facilities.
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713.2 When no public sewer intended to serve any lot or
premises is available in any thoroughfare or right of way
abutting such lot or premises, drainage piping from any
building or works shall be connected to an approved
private sewage disposal system.
713.4 The public sewer shall be permitted to be
considered as not being available when such public
sewer or any building or any exterior drainage facility
connected thereto is located more than two-hundred
(200) feet from any proposed building or exterior
drainage facility on any lot or premises that abuts and is
served by such public sewer.
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713.3 Within the limits prescribed by Section 713.4 hereof,
the rearrangement or subdivision into smaller parcels of a lot
that abuts and is served by a public sewer shall not be
deemed cause to permit the construction of a private sewage
disposal system, and plumbing or drainage systems on any
such smaller parcel or parcels shall connect to the public
sewer.
713.4 The public sewer shall be permitted to be considered
as not being available when such public sewer or any
building or any exterior drainage facility connected thereto
is located more than two-hundred (200) feet from any
proposed building or exterior drainage facility on any lot or
premises that abuts and is served by such public sewer.
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Sewers
312.0 The drainage system of each new building and of new work installed in any existing building shall be separate and independent from that of any other building, and, when available, every building shall have an independent connection with a public or private sewer.
Exception: where one building stands in the rear of another building on an interior lot, and no private sewer is available or can be constructed to the rear building through an adjoining court, yard, or driveway, the building drain from the front building shall be permitted to be extended to the rear building.
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TABLE 7-1
Materials for Drain, Waste, Vent Pipe and Fittings
Material Underground Drain, Waste,
Vent Pipe and Fittings
Above ground Drain,
Waste, Vent Pipe and
Fittings
Building Sewer Pipe and
Fittings
Referenced Standard(s)
Pipe Referenced Standard(s) Fittings
ABS (Schedule40) X X X
ASTM D1527, ASTM
D2661, ASTM D26801 ,
ASTM F628
ASTM D2661, ASTM D26801
Asbestos-Cement X
ASTM C4281 , ASTM C141
Brass
X
ASTM B43
Cast-Iron X X X ASTM A74, ASTM A888,
CISPI 301
ASME B16.12, ASTM A74, ASTM A888, CISPI 301
Co-Extruded ABS
(Schedule40) X X X ASTM F1488 ASTM, D2661, ASTM D26801
Co-Extruded PVC
(Schedule40) X X X ASTM F1488, ASTM F891
ASTM D2665, ASTM F7941 , ASTM F1866
Copper
(Type DWV) X X X
ASTM B75, ASTM B251,
ASTM B302, ASTM B306 ASME B16.23, ASME B16.29
Galvanized Malleable Iron
X
ASME B16.3
Galvanized Steel
X
ASTM A53
PVC
(Schedule 40) X X X
ASTM D1785, ASTM
D2665, ASTM F7941 ASTM D2665, ASTM F7941 , ASTM F1866
Stainless Steel 304 X
ASME A112.3.1 ASME A112.3.1
Stainless Steel 316L X X X ASME A112.3.1 ASME A112.3.1
Vitrified Clay (Extra
strength)
X ASTM C700 ASTM C700
1 For Building Sewer applications.
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Clay Pipe
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PVC DWV Pipe
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ABS Pipe
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SDR Pipe
ASTM-D-3034
This product is listed per chapter 14
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Concrete
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Cast Iron Sewer Pipe
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718.3 No building sewer or other drainage piping or part thereof, which is constructed of materials other than those approved for use under or within a building, shall be installed under or within five (5) feet of any building or structure, or part thereof, nor less than one (1) foot below the surface of the ground. The provisions of this subsection include structures such as porches and steps, whether covered or uncovered; breezeways; roofed porte cocheres; (po rt-k-sher) roofed patios; carports; covered walks; covered driveways; and similar structures or appurtenances.
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Trenching
315.0 Trenches deeper than the footing of any
building or structure and paralleling the same
shall be not less than 45 degrees
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Backfill
315.3 Excavations shall be completely backfilled as
soon after inspection as practicable. to such piping.
Trenches shall be backfilled in thin layers to twelve
(12) inches above the top of the piping with clean
earth, which shall not contain stones, boulders,
cinder fill, frozen earth, construction debris, or other
materials that would damage or break the piping or
cause corrosive action.
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Water & Sewer
720.1 Building sewers or drainage piping of
clay or materials that are not approved for use
within a building shall not be run or laid in the
same trench as the water pipes unless both of
the following requirements are met:
(1) The bottom of the water pipe, at points,
shall be not less than twelve (12) inches above
the top of the sewer or drain line.
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(2) The water pipe shall be placed on a solid shelf
excavated at one (1) side of the common trench with
a clear horizontal distance of not less than twelve
(12) inches from the sewer or drain line. Water
pipes crossing sewer or drainage piping constructed
of clay or materials that are not approved for use
within a building shall be laid not less than twelve
(12) inches above the sewer or drain pipe.
Note: For the purpose of this section, within the
building shall mean within the fixed limits of the
building foundation.
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718.1 Building sewers shall be run in practical alignment and at a uniform slope of not less than one-fourth (1/4) of an inch per foot toward the point of disposal.
Exception: When approved by the building official and where it is impractical, due to the depth of the street sewer or to the structural features or to the arrangement of any building or structure, to obtain a Slope of one-fourth (1/4) of an inch per foot, any such pipe or piping four (4) inches through six (6) inches shall be permitted to have a slope of not less than one-eighth (1/8) inch per foot and any such piping eight (8) inches and larger shall be permitted to have a slope of not less than one-sixteenth (1/16) of an inch per foot.
Take a look at table 7-5 FN 5
Slope
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718.3 No building sewer or other drainage piping or
part thereof, which is constructed of materials other
than those approved for use under or within a
building, shall be installed under or within five (5)
feet of any building or structure, nor less than one (1)
foot below the surface of the ground.
Depth
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Size of Sewer
717.1 The minimum size of any building sewer shall
be determined on the basis of the total number of
fixture units drained by such sewer, in accordance
with Table 7-8. No building sewer shall be smaller
than the building drain.
Rule of thumb;
3-bath house minimum 3 sewer
4-bath house minimum 4 sewer 26
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Table 7-5
Maximum Unit Loading and Maximum Length of Drainage and Vent Piping
Size of Pipe, inches
(mm)
1-1/4
(32)
1-1/2
(40)
2
(50)
2-1/2
(65)
3
(80)
4
(100)
5
(125)
6
(150)
8
(200)
10
(250)
12
(300)
Maximum Units
Drainage Piping1
Vertical 1 22 16
3 32
3 48
4 256 600
1,38
0 3,600 5,600 8,400
Horizontal 1 22
83 14
3 35
4,5 216
5 428
5 720
5 2,640
5 4,6805
8,2005
Maximum Length
Drainage Piping
Vertical, feet 45 65 85 148 212 300 390 510 750
(m) (14) (20) (26) (45) (65) (91) (119) (155) (228)
Horizontal (unlimited)
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Table 7-5 Footnote