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Chapter 10 - Traps, Interceptors and Separators.pdf

Chapter 10 - Traps, Interceptors and Separators.pdf

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TRAPS, INTERCEPTORS AND SEPARATORS

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1003.3 Grease traps and grease interceptors. Grease traps
and grease interceptors shall comply with the requirements of
Sections 1003.3.1 through 1003.3.4.2.
1003.3.1 Grease traps and grease interceptors required.
A grease trap or grease interceptor shall be required to receive the drainage from fixtures and equipment with
grease-laden waste located in food preparation areas, such
as in restaurants, hotel kitchens, hospitals, school kitchens,
bars, factory cafeterias, or restaurants and clubs.
1003.3.2 Food waste grinders. Where food waste grinders
connect to grease traps, a solids interceptor shall separate
the discharge before connecting to the grease trap. Solids interceptors and grease interceptors shall be sized and rated
for the discharge of the food waste grinder.
1003.3.3 Grease trap and grease interceptor not required. A grease trap or a grease interceptor shall not be required for individual dwelling units or any private living
quarters.
1003.3.4 Grease traps and grease interceptors. Grease
traps and grease interceptors shall conform to PDI G101,
ASME A 112.14.3 o r ASME A112.14.4 and shall be installed in accordance with the manufacturer's instructions.
1003.3.4.1 Grease trap capacity. Grease traps shall have
the grease retention capacity indicated in Table 1003.3.4.1
for the flow-through rates indicated.
TABLE 1003.3.4.1
CAPACITY OF GREASE TRAPS

TOTAL
FLOW-THROUGH
RATING (gprn)

GREASE
RETENTION
CAPACITY
(pounds)

4

8

6

12

7

14

9

18

10

20

12

24

14

28

15

30

18

36

20

40

25

50

35

70

50

100

For SI: 1 gallon per minute = 3.785 Urn, 1 pound = 0.454 kg.

1003.3.4.2 Rate of flow controls. Grease traps shall be
equipped with devices to control the rate of water flow so
that the water flow does not exceed the rated flow. The
flow-control device shall be vented and terminate not less

than 6 inches (152 mm) above the flood rim level or be
installed in accordance with the manufacturer's instructions.

1003.4 Oil separators required. At repair garages,
carwashing facilities with engine or undercarriage cleaning capability and at factories where oily and flammable liquid
wastes are produced, separators shall be installed into which all
oil-bearing, grease-bearing or flammable wastes shall be discharged before emptying in the building drainage system or
other point of disposal.
1003.4.1 Separation of liquids. A mixture of treated or untreated light and heavy liquids with various specific gravities shall be separated in an approved receptacle.
1003.4.2 Oil separator design. Oil separators shall be designed in accordance with Sections 1003.4.2.1 and
1003.4.2.2.
1003.4.2.1 General design requirements. Oil separators
shall have a depth of not less than 2 feet (610 mm) below
the invert of the discharge drain. The outlet opening of the
separator shall have not less than an 18-inch(457 mm) water seal.
1003.4.2.2 Garages and service stations. Where automobiles are serviced, greased, repaired or washed or
where gasoline is dispensed, oil separators shall have a
minimum capacity of 6 cubic feet (0.168 m3) for the first
100 square feet (9.3 rn2) of area to be drained, plus 1 cubic
foot(0.28m3) for each additional 100 square feet (9.3 m2)
of area to be drained into the separator. Parking garages in
which servicing, repairing or washing is not conducted,
and in which gasoline is not dispensed, shall not require a
separator. Areas of commercial garages utilized only for
storage of automobiles are not required to be drained
through a separator.
1003.5 Sand interceptors in commercial establishments. Sand
and similar interceptors for heavy solids shall be designed and located so as to be provided with ready access for cleaning, and shall
have a water seal of not less than 6 inches (152 mm).
1003.6 Laundries. Commercial laundries shall be equipped
with an interceptor with a wire basket or similar device, removable for cleaning, that prevents passage into the drainage system of solids 0.5 inch (12.7 mm) or larger in size, string, rags,
buttons or other materials detrimental to the public sewage system.
1003.7 Bottling establishments. Bottling plants shall discharge process wastes into an interceptor that will provide for
the separation of broken glass or other solids before discharging waste into the drainage system.
1003.8 Slaughterhouses. Slaughtering room and dressing
room drains shall be equipped with approved separators. The
separator shall prevent the discharge into the drainage system
of feathers, entrails and other materials that cause clogging.
1003.9 Venting of interceptors and separators. Interceptors
and separators shall be designed so as not to become air bound
where tight covers are utilized. Each interceptor or separator
shall be vented where subject to a loss of trap seal.
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TRAPS, INTERCEPTORS AND SEPARATORS

1003.10 Access and maintenance of interceptors and separators. Access shall be provided to each interceptor and separator for service and maintenance. Interceptors and separators
shall be maintained by periodic removal of accumulated
grease, scum, oil, or other floating substances and solids deposited in the interceptor or separator.
SECTION 1004
MATERIALS, JOINTS AND CONNECTIONS
1004.1 General. The materials and methods utilized for the
construction and installation of traps, interceptors and separators shall comply with this chapter and the applicable provisions of Chapters 4 and 7. The fittings shall not have ledges,
shoulders or reductions capable of retarding or obstructing
flow of the piping.

2003 INTERNATIONAL PLUMBING CODE@

2003 INTERNATIONAL PLUMBING CODE@

CHAPTER 11

STORM DRAINAGE

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SECTION 1101
GENERAL
1101.1 Scope. The provisions of this chapter shall govern the
materials, design, construction and installation of storm drainage.
1101.2 Where required. All roofs, paved areas, yards, courts
and courtyards shall drain into a separate storm sewer system,
or a combined sewer system, or to an approved place of disposal. For one- and two-family dwellings, and where approved,
storm water is permitted to discharge onto flat areas, such as
streets or lawns, provided that the storm water flows away from
the building.
1101.3 Prohibited drainage. Storm water shall not be drained
into sewers intended for sewage only.
1101.4 Tests. The conductors and the building storm drain
shall be tested in accordance with Section 3 12.
1101.5 Change in size. The size of a drainage pipe shall not be
reduced in the direction of flow.
1101.6 Fittings and connections. All connections and
changes in direction of the storm drainage system shall be made
with approved drainage-type fittings in accordance with Table
706.3. The fittings shall not obstruct or retard flow in the system.
1101.7 Roof design. Roofs shall be designed for the maximum
possible depth of water that will pond thereon as determined by
the relative levels of roof deck and overflow weirs, scuppers,
edges or serviceable drains in combination with the deflected
structural elements. In determining the maximum possible
depth of water, all primary roof drainage means shall be assumed to be blocked.
1101.8 Cleanouts required. Cleanouts shall be installed in the
storm drainage system and shall comply with the provisions of
this code for sanitary drainage pipe cleanouts.
Exception: Subsurface drainage system.
1101.9 Backwater valves. Backwater valves installed in a storm
drainage system shall conform to Section 715.
SECTION 1102
MATERIALS
1102.1 General. The materials and methods utilized for the
construction and installation of storm drainage systems shall
comply with this section and the applicableprovisions of Chapter 7.
1102.2 Inside storm drainage conductors. Inside storm
drainage conductors installed above ground shall conform to
one of the standards listed in Table 702.1.
1102.3 Underground building storm drain pipe. Underground building storm drain pipe shall conform to one of the
standards listed in Table 702.2.

1102.4 Building storm sewer pipe. Building storm sewer pipe
shall conform to one of the standards listed in Table 1102.4.
TABLE 1102.4
BUILDING STORM SEWER PIPE

1102.5 Subsoil drain pipe. Subsoil drains shall be
open-jointed, horizontally split or perforated pipe conforming
to one of the standards listed in Table 1102.5.
TABLE 1102.5
SUBSOIL DRAIN PIPE
MATERIAL

Asbestos-cement pipe

STANDARD

Cast-iron pipe

ASTM C 508
ASTM A 74; ASTM A 888;
CISPI 301

Polyethylene (PE) plastic pipe

ASTM F 405

Polyvinyl chloride (PVC)
Plastic pipe (type sewer pipe,
PS25, PS50 or PS100)

ASTM D 2729; ASTM F 891;
CSA-B 182.2;
CANICSA-B182.4

Vitrified clay pipe
Stainless steel drainage
Systems, Type 3 16L

ASTM C 4; ASTM C 700
ASME A112.3.1

1102.6 Roof drains. Roof drains shall conform to ASME
A112.21.2M orASMEA112.3-1.

STORM DRAINAGE

1102.7 Fittings. Pipe fittings shall be approved for installation
with the piping material installed, and shall conform to the respective pipe standards or one of the standards listed in Table
1102.7. The fittings shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping.
Threaded drainage pipe fittings shall be of the recessed drainage type.
TABLE 1102.7
PIPE FITTINGS

SECTION 1104
CONDUCTORS AND CONNECTIONS
1104.1 Prohibited use. Conductor pipes shall not be used as
soil, waste or vent pipes, and soil, waste or vent pipes shall not
be used as conductors.

1104.2 Combining storm with sanitary drainage. The sanitary and storm drainage systems of a structure shall be entirely
separate except where combined sewer systems are utilized.
Where a combined sewer is utilized, the building storm drain
shall be connected in the same horizontal plane through a single-wye fitting to the combined sewer at least 10 feet(3048
mm) downstream from any soil stack.
1104.3 Floor drains. Floor drains shall not be connected to a
storm drain.
SECTION 1105
ROOF DRAINS

1105.1 Strainers. Roof drains shall have strainers extending
not less than 4 inches (102 mm) above the surface of the roof
immediately adjacent to the roof drain. Strainers shall have an
available inlet area, above roof level, of not less than one and
one-half times the area of the conductor or leader to which the
drain is connected.

opper or copper alloy

1105.2 Flat decks. Roof drain strainers for use on sun decks,
parking decks and similar areas that are normally serviced and
maintained shall comply with Section 1105.1 or shall be of the
flat-surface type, installed level with the deck, with an available inlet area not less than two times the area of the conductor
or leader to whlch the drain is connected.
1105.3 Roof drain flashings. The connection between roofs
and roof drains which pass through the roof and into the interior
of the building shall be made water tight by the use of approved
flashing material.

SECTION 1103
TRAPS

1103.1 ~ a i trap.
n
~ e a d e r sand storm drains c~nnectedto a
combined sewer shall be trapped. IndividualstomwatertraPs
shall be installed on the storm water drain branch serving each
conductor, or a single trap shall be installed in the maindrain just before its connection with the combined buil&ng
sewer or the public sewer.
1103.2 Material. Storm water traps shall be of the same material as the piping system to which they are attached.
1103.3 Size. Traps for individual conductors shall be the same
size as the horizontal drain to which they are connected.
1103.4 Cleanout. An accessible cleanout shall be installed on
the building side of the trap.
80

SECTION 1106
SIZE OF CONDUCTORS, LEADERS
AND STORM DRAINS
1106.1 General. The size of the vertical conductors and leaders, building storm drains, building storm sewers, and any horizontal branches of such drains orsewers shall be basedon the
100-year hourly rainfall rate indicated in Figure 1106.1 or on
other rainfall rates determined from approved local weather

+,,I,

uaia.

1106.2 Vertical conductors and leaders. Vertical conductors
and leaders shall be sized for the maximum projected roof area,
in accordance with Table 1106.2.
1106.3 Building storm drains and sewers. The size of the
building storm drain, building storm sewer and their horizontal
branches having a slope of one-half unit or less vertical in 12
units horizontal (4-percent slope) shall be based on the maximum projected roof area in accordance with Table 1106.3. The
minimum slope of horizontal branches shall be one-eighth unit
vertical in 12 units horizontal (1-percent slope) unless otherwise approved.
2003 INTERNATIONAL PLUMBING CODEQ

STORM DRAINAGE

For SI: 1 inch = 25.4 mm.
Source: National Weather Service, National Oceanic and Atmospheric Administration, Washington D.C

2003 INTERNATIONAL PLUMBING CODEQ

STORM DRAINAGE

FIGURE 1106.1--continued
100-YEAR, 1-HOUR RAINFALL (INCHES)
CENTRAL UNITED STATES

For SI: 1 inch = 25.4 mm.
Source: National Weather Service, National Oceanic and Atmospheric Administration, Washington D.C.

2003 INTERNATIONAL PLUMBING CODE@

STORM DRAINAGE

FIGURE 1106.1--continued
100-YEAR, 1-HOUR RAINFALL (INCHES)
WESTERN UNITED STATES

For SI: 1 inch = 25.4 mm.
Source: National Weather Service, National Oceanic and Atmospheric Administration, Washington D.C.

2003 INTERNATIONAL PLUMBING CODE@

STORM DRAINAGE

FIGURE 1106.1--continued
100-YEAR, 1-HOUR RAINFALL (INCHES)

ALASKA

For SI: 1 inch = 25.4 mm.
Source: National Weather Service, National Oceanic and Atmospheric Administration, Washington D.C.

2003 INTERNATIONAL PLUMBING CODEQ

-

-

-

-

-

-

STORM DRAINAGE

FIGURE 1106.1--continued
100-YEAR, 1-HOUR RAINFALL (INCHES)
HAWAII

For SI: 1 inch

= 25.4 mm.

Source: National Weather Service, National Oceanic and Atmospheric Administration, Washington D.C.

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STORM DRAINAGE

TABLE 1106.2
SlZE OF VERTICAL CONDUCTORS AND LEADERS

For SI: 1 inch = 25.4mm, 1 square foot = 0.0929m2.
a. Sizes indicated are the diameter of circular piping. This table is applicable to piping of other shapes provided the cross-sectional shape fully encloses acircle of
the diameter indicated in this table.
TABLE 1106.3
SlZE OF HORIZONTALSTORM DRAINGE PIPING
SIZE OF
HORIZONTAL
PIPING
(inches)

HORIZONTALLY PROJECTED ROOF AREA (square feet)
Rainfall rate (inches per hour)
1

2

3

4

5

6

657
1,504
2,672
4,280
9,200
16,580
26,650
47,600

548
1,253
2,227
3,566
7,600
13,800
22,200
39,650

928
2,120
3,776
6,040
13,040
23,350
37,600
67,250

773
1,766
3,146
5,033
10,866
19,450
31,350
56,000

1,310
3,010
5,320
8,580
18,400
33,150
53,200
95,300

1,096
2,500
4,450
7,140
15,320
27,600
44,400
79,250

'18 unit vertical in 12 units horizontal (I-percent slope)

3
4
5
6
8
10
12
15

3,288
7,520
13,360
21,400
46,000
82,800
133,200
218,000

3
4
5
6
8
10
12
15

4,640
10,600
18,880
30,200
65,200
1 16,800
188,000
336,000

1,644
3,760
6,680
10,700
23,000
41,400
66,600
109,000

1,096
2,506
4,453
7,133
15,330
27,600
44,400
72,800

822
1,800
3,340
5,350
11,500
20,700
33,300
59,500

% unit vertical in 12 units horizontal (2-percent slope)

2,320
5,300
9,440
15,100
32,600
58,400
94,000
168,000

1,546
3,533
6,293
10,066
21,733
38,950
62,600
1 12,000

1,160
2,650
4,720
7,550
16,300
29,200
47,000
84,000

% unit vertical in 12 units horizontal (4-percent slope)

3
4
5
6
8
10
12
15

6,576
15,040
26,720
42,800
92,000
171,600
266,400
476,000

3,288
7,520
13,360
21,400
46,000
85,800
133,200
238,000

2,295
5,010
8,900
13,700
30,650
55,200
88,800
158,800

1,644
3,760
6,680
10,700
23,000
41,400
66,600
1 19,000

For SI: 1 inch = 25.4mm, 1 square foot = 0.0929m2.

2003 INTERNATIONAL PLUMBING CODE@