This chapter shall govern the materials, design, and installation of traps and interceptors.
Each plumbing fixture, shall be
separately trapped by an approved type of liquid seal trap.
This section shall not apply to fixtures with integral traps.
Not more than one trap shall be permitted on a trap arm. Food waste disposers installed with a set of restaurant, commercial,
or industrial sinks shall be connected to a separate
trap. Each domestic clothes washer and each laundry tub
shall be connected to a separate and independent trap,
except that a trap serving a laundry tub shall be permitted to
also receive the waste from a clothes washer set adjacent
thereto. The vertical distance between a fixture outlet and
the trap weir shall be as short as practicable, but in no case
shall the tailpiece from a fixture exceed 24 inches (610 mm)
in length. One trap shall be permitted to serve a set of not
more than three single compartment sinks or laundry tubs
of the same depth or three lavatories immediately adjacent
to each other and in the same room where the waste outlets
are not more than 30 inches (762 mm) apart and the trap is
centrally located where three compartments are installed.
Each plumbing fixture trap, except as
otherwise provided in this code, shall be protected against
siphonage, backpressure, and air circulation shall be
assured throughout the drainage system by means of a vent
pipe installed in accordance with the requirements of this code.
Each fixture trap shall have a protecting
vent so located that the developed length of the trap
arm from the trap weir to the inner edge of the vent shall be
within the distance given in Table 1002.2, but in no case
less than two times the diameter of the trap arm.
For SI units: 1 inch = 25.4 mm
Notes:
1 Maintain 1⁄4 inch per foot slope (20.8 mm/m).
| TRAP ARM PIPE DIAMETER (inches) | DISTANCE TRAP TO VENT MINIMUM (inches) | LENGTH MAXIMUM (inches) |
|---|---|---|
| 1¼ | 2½ | 30 |
| 1½ | 3 | 42 |
| 2 | 4 | 60 |
| 3 | 6 | 72 |
| 4 | 8 | 120 |
| Exceeding 4 | 2 x Diameter | 120 |
Notes:
1 Maintain 1⁄4 inch per foot slope (20.8 mm/m).
2 The developed length between the trap of a water closet or similar fixture (measured from the top of the closet flange to the inner edge of the vent) and its vent shall not exceed 6 feet (1829 mm).
A trap arm shall be permitted
to change direction without the use of a cleanout where
such change of direction does not exceed 90 degrees (1.57
rad). Horizontal changes in direction of trap arms shall be
in accordance with Section 706.3.
Exception: For trap arms 3 inches (80 mm) in diameter and larger, the change of direction shall not exceed 135 degrees (2.36 rad) without the use of a cleanout.
Exception: For trap arms 3 inches (80 mm) in diameter and larger, the change of direction shall not exceed 135 degrees (2.36 rad) without the use of a cleanout.
The vent pipe opening from a
soil or waste pipe, except for water closets and similar fixtures,
shall not be below the weir of the trap.
Each trap, except for traps
within an interceptor or similar device shall be self cleaning.
Traps for bathtubs, showers, lavatories, sinks, laundry tubs,
floor drains, urinals, drinking fountains, dental units, and
similar fixtures shall be of standard design, weight and shall
be of ABS, cast-brass, cast-iron, lead, PP, PVC, or other
approved material. An exposed and readily accessible
drawn-copper alloy tubing trap. not less than 17 B & S
Gauge (0.045 inch) (1.143 mm), shall be permitted to be
used on fixtures discharging domestic sewage.
Exceptions:
Exceptions:
- Drawn-copper alloy tubing traps shall not be used for 1 urinals. Each trap shall have the manufacturer's name stamped legibly in the metal of the trap, and each tubing trap shall have the gauge of the tubing in addition to the manufacturer's name. A trap shall have a smooth and uniform interior waterway.
- [HCD 1 & HCD 2] Non-water supplied urinals conforming to ASME A112.19.19-2006, Standard for Vitreous China Nonwater Urinals, or reference standards in Table 1701.1 for non-vitreous ceramic or plastic urinal fixtures.
A maximum of one approved
slip joint fitting shall be permitted to be used on the outlet
side of a trap, and no tubing trap shall be installed without a
listed tubing trap adapter. Listed plastic trap adapters shall
be permitted to be used to connect listed metal tubing traps.
The size (nominal diameter) of a trap for a
given fixture shall be sufficient to drain the fixture rapidly,
but in no case less than nor more than one pipe size larger
than given in Table 702.1. The trap shall be the same size as
the trap arm to which it is connected.
No form of trap that depends for its seal
upon the action of movable parts shall be used. No trap that
has concealed interior partitions, except those of plastic,
glass, or similar corrosion-resisting material, shall be used.
"S" traps, bell traps, and crown-vented traps shall be prohibited.
No fixture shall be double trapped. Drum and bottle
traps shall be installed for special conditions. No trap shall
be installed without a vent, except as otherwise provided in this code.
Bladders, check valves or other
type of devices with moveable parts shall be prohibited to
serve as a trap.
Each fixture trap shall have a liquid seal of
not less than 2 inches (51 mm) and not more than 4 inches
(102 mm), except where a deeper seal is found necessary by
the Authority Having Jurisdiction. Traps shall be set true
with respect to their liquid seals and, where necessary, they
shall be protected from freezing.
Floor drains shall connect into a trap so
constructed that it can be readily cleaned and of a size to
serve efficiently the purpose for which it is intended. The
drain inlet shall be so located that it is in full view. Where
subject to reverse flow of sewage or liquid waste, such
drains shall be equipped with an approved backwater valve.
Floor drain or similar traps directly connected
to the drainage system and subject to infrequent use
shall be protected with a trap seal primer, except where not
deemed necessary for safety or sanitation by the Authority
Having Jurisdiction. Trap seal primers shall be accessible
for maintenance.
Building traps shall not be installed except
where required by the Authority Having Jurisdiction. Each
building trap where installed shall be provided with a
cleanout and with a relieving vent or fresh-air intake on the
inlet side of the trap, which need not be larger than one-half
the diameter of the drain to which it connects. Such relieving
vent or fresh-air intake shall be carried above grade and
terminate in a screened outlet located outside the building.
Interceptors (clarifiers) (including
grease, oil, sand, solid interceptors, etc.) shall be
required by the Authority Having Jurisdiction where they
are necessary for the proper handling of liquid wastes containing
grease, flammable wastes, sand, solids, acid or alkaline
substances, or other ingredients harmful to the building
drainage system, the public or private sewer, or to public or
private sewage disposal.
The size, type, and location of each
interceptor (clarifier) or separator shall be approved by the
Authority Having Jurisdiction. Except where otherwise
specifically permitted, no wastes other than those requiring
treatment or separation shall be discharged into an interceptor
(clarifier).
Interceptors (clarifiers) for sand and similar
heavy solids shall be so designed and located as to be readily
accessible for cleaning and shall have a water seal of not
less than 6 inches (152 mm).
Interceptors (clarifiers) shall be so
designed that they will not become air-bound where closed
covers are used. Each interceptor (clarifier) shall be properly
vented.
Each interceptor (clarifier) cover shall be
readily accessible for servicing and maintaining the interceptor
(clarifier) in working and operating condition. The
use of ladders or the removal of bulky equipment in order
to service interceptors (clarifiers) shall constitute a violation
of accessibility. Location of interceptors (clarifiers) shall be
shown on the approved building plan.
Interceptors shall be
maintained in efficient operating condition by periodic
removal of accumulated grease, scum, oil, or other floating
substances and solids deposited in the interceptor.
The waste pipe from oil and sand interceptors
shall discharge as approved by the Authority
Having Jurisdiction.
A fish, fowl, and animal slaughterhouse or
establishment; a fish, fowl, and meat packing or curing
establishment; a soap factory, tallow-rendering, fat-rendering,
and a hide-curing establishment shall be connected to
and shall drain or discharge into an approved grease interceptor
(clarifier).
Drainage
and plumbing systems shall meet the requirements of
Section 724.0.
Each floor drain shall be equipped with
a deep-seal trap.
The plumbing shall be installed so as to prevent
sewage from backing up and flooding the floor.
Exception: Floor drains in areas not regularly washed down will be acceptable with deep-seal traps, provided that such drains are connected to secondary drainage systems discharging into a safe sink or basin (air gap) that is properly trapped and vented, and that such drains accomplish the objectives and intent of this section.
Exception: Floor drains in areas not regularly washed down will be acceptable with deep-seal traps, provided that such drains are connected to secondary drainage systems discharging into a safe sink or basin (air gap) that is properly trapped and vented, and that such drains accomplish the objectives and intent of this section.
Interceptor traps which are connected with
the sewer system shall not be near any edible products
department or in any area where products are unloaded
from or loaded into vehicles. To facilitate cleaning,
such traps shall have inclined bottoms and be provided
with suitable covers.
All drains
shall be properly installed with adequate deep-sealed traps
of the conventional "P," "U" or "S" type and vents.
There shall be an efficient drainage and plumbing system
for the establishment and premises. All drains and gutters
shall be installed with traps and vents approved by the
Department.
There shall be an
efficient drainage and plumbing system for the plant and
premises.
All drains and gutters
shall be properly installed with approved traps and
vents. The drainage and plumbing system must permit
the quick runoff of all water from plant buildings, and
of surface water around the plant on the premises, and
all such water shall be disposed of in such a manner as
to prevent a nuisance or health hazard.
The sewer system
have adequate slope and capacity to remove readily all
waste from the various processing operations and to
minimize, or if possible, prevent stoppage and surcharging
of the system. When the sewage disposal system
is a private system which is required to be
approved by a state or local health authority, the applicant
shall furnish the administrator a letter from the
proper health authority indicating that the sewage disposal
system is acceptable to such authority.
A private or public wash rack, or floor or
slab used for cleaning machinery or machine parts shall be
adequately protected against storm or surface water and shall
drain or discharge into an approved interceptor (clarifier).
Laundry equipment in commercial and
industrial buildings that does not have integral strainers
shall discharge into an interceptor having a wire basket or
similar device that is removable for cleaning and that will prevent passage into the drainage system of solids ½ of an
inch (12.7 mm) or larger in maximum dimension, such as
string, rags, buttons, or other solid materials detrimental to
the public sewerage system.
Bottling plants shall discharge their process
wastes into an interceptor that will provide for the separation
of broken glass or other solids, before discharging
liquid wastes into the drainage system.
Where it is determined by the Authority
Having Jurisdiction that waste pre-treatment is required, an
approved type of grease interceptor(s) in accordance with
ASME A112.14.3, ASME A112.14.4, CSA B481, PDI G-101, or PDI G-102, and sized in accordance with Section
1014.2.1 or Section 1014.3.6, shall be installed in accordance
with the manufacturer's installation instructions to
receive the drainage from fixtures or equipment that produce
grease-laden waste located in areas of establishments
where food is prepared, or other establishments where
grease is introduced into the drainage or sewage system in
quantities that can affect line stoppage or hinder sewage
treatment or private sewage disposal systems. A combination of hydro-mechanical, gravity grease interceptors, and
engineered systems shall be allowed in order to meet this
code and other applicable requirements of the Authority
Having Jurisdiction where space or existing physical constraints
of existing buildings necessitate such installations.
A grease interceptor shall not be required for individual
dwelling units or for private living quarters. Water closets,
urinals, and other plumbing fixtures conveying human
waste shall not drain into or through the grease interceptor.
The Authority Having
Jurisdiction is the individual official, board, department or
agency authorized to administer and enforce the sewage
treatment system in the area of the location of the health
facility.
Grease interceptors shall
not be installed in food preparation area of the kitchens.
Grease interceptors shall be
installed outside of the kitchen area in location affording
ease of maintenance and servicing.
Each fixture discharging
into a grease interceptor shall be individually
trapped and vented in an approved manner.
Grease interceptors shall be
maintained in efficient operating condition by periodic
removal of the accumulated grease and latent material.
No such collected grease shall be introduced into
drainage piping or a public or private sewer. Where the
Authority Having Jurisdiction determines that a grease
interceptor is not being properly cleaned or maintained,
the Authority Having Jurisdiction shall have the authority
to mandate the installation of additional equipment or
devices and to mandate a maintenance program.
No food waste disposer or dishwasher
shall be connected to or discharge into a grease interceptor.
Commercial food waste disposers shall be permitted
to discharge directly into the building's drainage
system.
Exception: Food waste disposers shall be permitted to discharge to grease interceptors that are designed to receive the discharge of food waste.
Exception: Food waste disposers shall be permitted to discharge to grease interceptors that are designed to receive the discharge of food waste.
Plumbing fixtures or equipment connected to a Type A and B
hydromechanical grease interceptor shall discharge through
an approved type of vented flow control installed in a readily
accessible and visible location. Flow control devices
shall be designed and installed so that the total flow through
such device or devices shall at no time be greater than the
rated flow of the connected grease interceptor. No flow
control device having adjustable or removable parts shall be
approved. The vented flow control device shall be located
such that no system vent shall be between the flow control
and the grease interceptor inlet. The vent or air inlet of the
flow control device shall connect with the sanitary drainage
vent system, as elsewhere required by this code, or shall terminate
through the roof of the building, and shall not terminate
to the free atmosphere inside the building.
Exception: Listed grease interceptors with integral flow controls or restricting devices shall be installed in an accessible location in accordance with the manufacturer's installation instructions.
Exception: Listed grease interceptors with integral flow controls or restricting devices shall be installed in an accessible location in accordance with the manufacturer's installation instructions.
The total capacity in gallons (gal)
(L) of fixtures discharging into a hydromechanical
grease interceptor shall not exceed two and one-half
times the certified gallon per minute (gpm) (L/s) flow
rate of the interceptor in accordance with Table
1014.2.1.
For the purpose of this section, the term "fixture" shall mean and include each plumbing fixture, appliance, apparatus, or other equipment required to be connected to or discharged into a grease interceptor by a provision of this section.
For SI units: 1 inch = 25 mm, 1 gallon per minute = 0.06 L/s
Notes:
EXAMPLE 1014.2.1
SIZING HYDROMECHANICAL GREASE INTERCEPTOR(S) USING FIXTURE CAPACITY
Step 1: Determine the flow rate from each fixture.
[Length] X [Width] X [Depth] / [231] = Gallons X [.75 fill factor] / [Drain Period (1 minute or 2 minutes)]
Step 2: Calculate the total load from fixtures that discharge into the interceptor.
For SI units: 1 inch = 25.4 mm, 1 gallon per minute = 0.06 L/s, 1 gallon = 3.785 L
For the purpose of this section, the term "fixture" shall mean and include each plumbing fixture, appliance, apparatus, or other equipment required to be connected to or discharged into a grease interceptor by a provision of this section.
| DIAMETER OF GREASE WASTE PIPE (inches) |
MAXIMUM FULL PIPE FLOW (gpm)2 |
SIZE OF GREASE INTERCEPTOR |
|
| ONE-MINUTE DRAINAGE PERIOD (gpm) |
TWO-MINUTE DRAINAGE PERIOD (gpm) |
||
| 2 | 20 | 20 | 10 |
| 3 | 60 | 75 | 35 |
| 4 | 125 | 150 | 75 |
| 5 | 230 | 250 | 125 |
| 6 | 375 | 500 | 250 |
Notes:
1 For interceptor sizing by fixture capacity see the example below.
2 ¼ inch slope per foot (20.8 mm/m) based on Manning's formula with friction factor N =.012.
SIZING HYDROMECHANICAL GREASE INTERCEPTOR(S) USING FIXTURE CAPACITY
Step 1: Determine the flow rate from each fixture.
[Length] X [Width] X [Depth] / [231] = Gallons X [.75 fill factor] / [Drain Period (1 minute or 2 minutes)]
Step 2: Calculate the total load from fixtures that discharge into the interceptor.
| FIXTURES |
COMPARTMENTS | LOAD (gallons) |
SIZE OF GREASE INTERCEPTOR ONE- MINUTE DRAINAGE PERIOD (gpm) |
TWO-MINUTE DRAINAGE PERIOD (gpm) |
|---|---|---|---|---|
| Compartment size |
- | - | - | - |
| 24 inches x 24 inches x 12 inches |
2 | 44.9 | - | - |
| Dydrant | - | 3 | - | - |
| Rated Appliance |
- | 2 | - | - |
| - | - | 49.9 | 50 | 25 |
A vent shall be installed downstream of
hydromechanical grease interceptors in accordance
with the requirements of this code.
Required gravity
grease interceptors shall comply with the provisions of
Section 1014.3.1 through Section 1014.3.7.
Waste discharge
in establishments from fixtures and equipment
which contain grease, including but not limited to,
scullery sinks, pot and pan sinks, dishwashers, soup
kettles, and floor drains located in areas where grease containing
materials exist, shall be permitted to be
drained into the sanitary waste through the interceptor
where approved by the Authority Having Jurisdiction.
Toilets, urinals,
and other similar fixtures shall not drain through
the interceptor.
Waste shall enter the interceptor
through the inlet pipe.
Gravity interceptors shall be constructed
in accordance with the applicable standard in
Table 1701.1 or the design approved by the Authority
Having Jurisdiction.
Each grease interceptor shall be so
installed and connected that it shall be easily accessible
for inspection, cleaning, and removal of the intercepted
grease. A gravity grease interceptor in accordance with
IAPMO Z1001, shall not be installed in a building where
food is handled. Location of the grease interceptor shall
meet the approval of the Authority Having Jurisdiction.
Interceptors shall be
placed as close as practical to the fixtures they
serve.
Each business
establishment for which a gravity grease interceptor
is required shall have an interceptor which shall
serve that establishment unless otherwise approved
by the Authority Having Jurisdiction.
Each gravity grease interceptor
shall be located so as to be readily accessible to the
equipment required for maintenance.
Gravity grease
interceptors shall be designed to remove grease from
effluent and shall be sized in accordance with this section.
Gravity grease interceptors shall also be designed
to retain grease until accumulations can be removed by
pumping the interceptor. It is recommended that a sample
box be located at the outlet end of gravity grease
interceptors so that the Authority Having Jurisdiction
can periodically sample effluent quality.
The volume of the interceptor
shall be determined by using Table 1014.3.6. Where
drainage fixture units (DFUs) are not known, the interceptor
shall be sized based on the maximum DFUs
allowed for the pipe size connected to the inlet of the
interceptor. Refer to Table 703.2, Drainage Piping,
Horizontal.
For SI Units: 1 gallon = 3.785 L
Notes:
1 The maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor.
2 This size is based on: DFUs, the pipe size from this code; Table 703.2; Useful Tables for flow in half-full pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition, 1992). Based on 30-minute retention time (ref.: George Tchobanoglous and Metcalf & Eddy. Wastewater Engineering Treatment, Disposal and Reuse, 3rd Ed. 1991 & Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems, 1998). Rounded up to nominal interceptor volume.
3 Where the flow rate of directly connected fixture( s) or appliance( s) have no assigned DFU values, the additional grease interceptor volume shall be based on the known flow rate (gpm) (L/s) multiplied by 30 minutes.
| DRAINAGE FIXTURE UNITS 1,3 (DFUs) |
INTERCEPTOR VOLUME2 (gallons) |
|---|---|
| 8 | 500 |
| 21 | 750 |
| 35 | 1000 |
| 90 | 1250 |
| 172 | 1500 |
| 216 | 2000 |
| 307 | 2500 |
| 342 | 3000 |
| 428 | 4000 |
| 576 | 5000 |
| 720 | 7500 |
| 2112 | 10000 |
| 2640 | 15000 |
Notes:
1 The maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor.
2 This size is based on: DFUs, the pipe size from this code; Table 703.2; Useful Tables for flow in half-full pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition, 1992). Based on 30-minute retention time (ref.: George Tchobanoglous and Metcalf & Eddy. Wastewater Engineering Treatment, Disposal and Reuse, 3rd Ed. 1991 & Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems, 1998). Rounded up to nominal interceptor volume.
3 Where the flow rate of directly connected fixture( s) or appliance( s) have no assigned DFU values, the additional grease interceptor volume shall be based on the known flow rate (gpm) (L/s) multiplied by 30 minutes.
Abandoned grease interceptors shall be pumped and
filled as required for abandoned sewers and sewage
disposal facilities in Section 722.0.
The purpose of this section is to provide
the necessary criteria for the sizing, application, and installation
of FOG disposal systems designated as a pretreatment
or discharge water quality compliance strategy.
FOG disposal systems, including components, materials, and
equipment necessary for the proper function of the system,
shall be in accordance with ASME A112.14.6.
FOG disposal systems shall be sized and installed in accordance with the manufacturer's installation instructions.
FOG disposal systems shall produce
an effluent quality not to exceed 5.84 grains per gallon
(gr/gal) (100 mg/L) FOG in accordance with ASME
A112.14.6.
Grease interceptors shall not
be installed in food preparation area of kitchens.
Grease interceptors shall be
installed outside of the kitchen area in location affording
ease of maintenance and servicing.
EXAMPLE 1014.3.6
GRAVITY GREASE INTERCEPTOR SIZING EXAMPLE
Given: A restaurant with the following fixtures and equipment.
One food preparation sink; three floor drains - one in the food prep area, one in the grill area, and one receiving the indirect waste from the ice machine and a mop sink.
Kitchen Drain Line DFU Count (from Table 702.1):
Using Table 1014.3.6, the grease interceptor will be sized at 750 gallons (2389 L).
GRAVITY GREASE INTERCEPTOR SIZING EXAMPLE
Given: A restaurant with the following fixtures and equipment.
One food preparation sink; three floor drains - one in the food prep area, one in the grill area, and one receiving the indirect waste from the ice machine and a mop sink.
Kitchen Drain Line DFU Count (from Table 702.1):
| 3 floor drains at 2 DFUs each | = | 6 DFUs |
| Mop sink at 3 DFUs each | = | 3 DFUs |
| Food prep sink at 3 DFUs each | = | 3 DFUs |
| Total | = | 12 DFUs |
Using Table 1014.3.6, the grease interceptor will be sized at 750 gallons (2389 L).
Where the discharge of a fixture or drain
contain solids or semi-solids heavier than water that would
be harmful to a drainage system or cause a stoppage within
the system, the discharge shall be through a sand interceptor.
Multiple floor drains shall be permitted to discharge
into one sand interceptor.
Sand interceptors
are required where the Authority Having Jurisdiction deems
it advisable to have a sand interceptor to protect the
drainage system.
Sand interceptors shall be
built of brick or concrete, prefabricated coated steel, or
other watertight material. The interceptor shall have an interior
baffle for full separation of the interceptor into two sections.
The outlet pipe shall be the same size as the inlet pipe
of the sand interceptor, the minimum being 3 inches (80
mm), and the baff1e shall have two openings of the same
diameter as the outlet pipe and at the same invert as the outlet
pipe. These openings shall be staggered so that there
cannot be a straight line flow between the inlet pipe and the
outlet pipe. The invert of the inlet pipe shall be no lower
than the invert of the outlet pipe.
The sand interceptor shall have a minimum dimension of 2 square feet (0.2 m2) for the net free opening of the inlet section and a minimum depth under the invert of the outlet pipe of 2 feet (610 mm).
For each 5 gpm (0.3 L/s) flow or fraction thereof over 20 gpm (1.26 L/s), the area of the sand interceptor inlet section is to be increased by 1 square foot (0.09 m2). The outlet section shall at all times have a minimum area of 50 percent of the inlet section.
The outlet section shall be covered by a solid removable cover, set flush with the finished floor, and the inlet section shall have an open grating, set flush with the finished floor and suitable for the traffic in the area in which it is located.
The sand interceptor shall have a minimum dimension of 2 square feet (0.2 m2) for the net free opening of the inlet section and a minimum depth under the invert of the outlet pipe of 2 feet (610 mm).
For each 5 gpm (0.3 L/s) flow or fraction thereof over 20 gpm (1.26 L/s), the area of the sand interceptor inlet section is to be increased by 1 square foot (0.09 m2). The outlet section shall at all times have a minimum area of 50 percent of the inlet section.
The outlet section shall be covered by a solid removable cover, set flush with the finished floor, and the inlet section shall have an open grating, set flush with the finished floor and suitable for the traffic in the area in which it is located.
Sand and similar interceptors for
every solid shall be so designed and located as to be readily accessible for cleaning, shall have a water seal of not less
than 6 inches (152 mm), and shall be vented.
Repair garages and gasoline
stations with grease racks or grease pits, and factories that
have oily, flammable, or both types of wastes as a result of
manufacturing, storage, maintenance, repair, or testing processes,
shall be provided with an oil or flammable liquid
interceptor that shall be connected to necessary floor drains.
The separation or vapor compartment shall be independently
vented to the outer air. Where two or more separation or
vapor compartments are used, each shall be vented to the
outer air or shall be permitted to connect to a header that is
installed at a minimum of 6 inches (152 mm) above the spill
line of the lowest floor drain and vented independently to
the outer air. The minimum size of a flammable vapor vent
shall be not less than 2 inches (50 mm), and, where vented
through a sidewall, the vent shall be not less than 10 feet
(3048 mm) above the adjacent level at an approved location.
The interceptor shall be vented on the sewer side and shall
not connect to a flammable vapor vent. Oil and flammable
interceptors shall be provided with gas tight cleanout covers
that shall be readily accessible. The waste line shall be not
less than 3 inches (80 mm) in diameter with a full-size
cleanout to grade. Where an interceptor is provided with an
overflow, it shall be provided with an overflow line [not less
than 2 inches (50 mm) in diameter] to an approved waste oil
tank having a minimum capacity of 550 gallons (2082 L)
and meeting the requirements of the Authority Having
Jurisdiction. The waste oil from the separator shall flow by
gravity or shall be pumped to a higher elevation by an automatic
pump. Pumps shall be adequately sized and accessible.
Waste oil tanks shall have a 2 inch (50 mm) minimum
pump-out connection at grade and a 1½ inch (40 mm) minimum
vent to atmosphere at an approved location not less
than 10 feet (3048 mm) above grade.
Each manufactured interceptor
that is rated shall be stamped or labeled by the manufacturer
with an indication of its full discharge rate in gpm
(L/s). The full discharge rate to such an interceptor shall be
determined at full flow. Each interceptor shall be rated
equal to or greater than the incoming flow and shall be provided
with an overflow line to an underground tank.
Interceptors not rated by the manufacturer shall have a depth of not less than 2 feet (610 mm) below the invert of the discharge drain. The outlet opening shall have not less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows: Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m3), and 1 cubic foot (0.03 m3) of capacity shall be added for each vehicle up to 10 vehicles. Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required. Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m3) for each 100 square feet (9.29 m2) of surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m3).
Interceptors not rated by the manufacturer shall have a depth of not less than 2 feet (610 mm) below the invert of the discharge drain. The outlet opening shall have not less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows: Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m3), and 1 cubic foot (0.03 m3) of capacity shall be added for each vehicle up to 10 vehicles. Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required. Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m3) for each 100 square feet (9.29 m2) of surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m3).