A. 
Each plumbing fixture or waste inlet shall be separately trapped by a trap integral with the plumbing fixture or by a water-seal trap placed as near to the fixture or waste inlet as possible, except that:
(1) 
A combination fixture may have only one trap, provided that no separate compartment of such fixture is deeper than any other compartment connected to the same trap, and the waste outlets of such compartments are not more than 30 inches apart.
131a 24A1a.tif
Kitchen sinks having two compartments of different levels may have a continuous waste and one trap; the trap and waste line shall be a minimum of 1 1/2 inches in size. Kitchen sinks having three compartments where one or more may be of different levels may have a continuous waste and one trap in accordance with § 131-29A; the trap and waste line shall be a minimum of two inches in size.
131b 24A1b.tif
(2) 
A set of three single-compartment laundry trays may be connected to one trap, provided that the waste outlets are not more than 30 inches apart; and where three fixtures are so installed, the trap is centrally located.
131c 24A2.tif
(3) 
Dishwasher wastes may be discharged through a directional flow fitting located between the sink fixture and the fixture trap or through an approved inlet fitting in a garbage grinder, provided that a fixture drain loop is installed on the dishwasher waste to the highest point below the fixture rim and the distances on center between the waste outlets of the sink and the dishwasher do not exceed six feet.
131d 24A3.tif
B. 
The use or installation of the following types of traps is prohibited:
(1) 
Any trap, the seal of which depends upon the action of movable parts.
(2) 
Any trap with interior partitions, except when integral with vitrified clay plumbing fixtures.
(3) 
Double traps, unless a fresh air inlet is connected to the system between the traps.
(4) 
Crown-vented traps.
C. 
Trap seal. Each fixture trap shall have a water seal.
D. 
Trap cleanouts. Each fixture trap, except those cast integral or in combination with fixtures in which the trap seal is readily accessible or except when a portion of the trap is readily removable for cleaning purposes, shall have an accessible brass or nylon resin trap screw of ample size.
E. 
Trap levels and protection. All traps shall be set true with respect to their water levels and shall be protected from freezing and evaporation and other loss of seal.
F. 
Traps for floor drains. All floor drains, including cellar drains, shall be trapped. Floor drain traps shall be located at such depth below the drain inlet as to be readily accessible for cleaning. A cleanout is not required for a floor drain.
G. 
House traps. An approved house trap shall be installed in each sanitary house drain and each house storm drain located within the property lines of the building they serve and shall be located at the curbline or in the building just inside the foundation wall. There shall be an air inlet for fresh air entering the house drain just inside the water seal of the trap.
The house trap shall be not less in size than the house drainpipe it traps, and in no case less than four inches. In old buildings where the house trap is replaced and it is impossible to conform to these requirements due to the inability to make an approved connection to existing lateral piping, a minimum size of four-inch cast-iron house trap may be used when approved by the Plumbing Inspector. Fresh air inlets shall be four inches in size for five-inch and six-inch drains, six inches in size for eight-inch drains, eight inches in size for ten-inch and twelve-inch drains, 10 inches in size for fifteen-inch drains and 12 inches in size for eighteen-inch drains. For drains larger than 18 inches, the area of the air inlet pipes shall be equal to at least 75% of the area of the trap size. The maximum size of a fresh air inlet shall be 12 inches nominal diameter. If more than one fresh air inlet is required, each fresh air inlet shall not exceed 12 inches nominal diameter.
A. 
Air inlets shall lead to the outer air and shall open at a convenient point on the footway in the front of the building, or they shall be located at the curbline and shall have a cover with openings at least 3/4 of the area of the pipe. They shall be so arranged as to prevent the admission of sticks or other articles that would tend to obstruct the main trap. They shall be at least 1/4 inch in thickness, fastened with brass screws or bolts, in order that the top may be removed if necessary, and the body shall be caulked fast to the upright pipe by a lead joint.
B. 
No form of air inlet shall be used unless it has been approved by the Plumbing Inspector. In no case shall an air inlet open within 10 feet of any door, window or fresh air intake for a heater or ventilation shaft.
Brass traps of lavatories and sinks shall be made of brass having a wall thickness not less than No. 17 of the Brown & Sharpe gauge, and the number of the gauge shall be stamped into the metal for inspection.
Drum traps for bathtubs must have accessible cleanouts. The cleanout plug and cleanout opening of bath traps shall be not less in size than two inches nominal diameter. The body of such traps shall be not less than 2 1/2 inches in diameter, and the trap shall have a water seal of not less than two inches in depth. P traps for bathtubs shall be made of cast brass, cast iron, galvanized durham piping, ABS and PVC. ABS and PVC plastic traps shall conform to the size of the trap and ABS Tubular F409 or PVC Tubular F409 or P Tubular F409 and shall be installed in accordance with § 131-1. The minimum size trap shall be 1 1/2 inches inside nominal diameter and shall have a water seal of not less than two inches and not more than four inches. Cleanouts are not required. Seventeen-gauge traps are not permitted to be used as bath traps. A fourteen-inch-wide and twenty-eight-inch-high trouble door or panel shall be provided to afford access to the bath trap and waste and overflow, and it shall be located on the wall behind the end of the bathtub where the drain outlet is located. The access panel may be 12 inches by 18 inches when located in the ceiling below.
A. 
Except for fixtures with integral traps, the size of a trap for a given fixture shall not be smaller than specified in the following table:
Fixture Trap and Fixture Drain Dimensions
Fixture
Minimum Size of Trap and Fixture Drain
(inches)
Bathtub (with or without shower)
1 1/2
Bidet
1 1/4
Combination fixture (not over 2 compartments on same level)
1 1/2
Domestic washing machine
1 1/2
Drinking fountain
1 1/4
Floor drain
3
Fountain cuspidor (dental chair)
1 1/4
Laundry tray (1 or 2 compartments)
1 1/2
Laundry tray (3 compartments)
2
Lavatory
1 1/4
Shower stall (1 shower head and body sprays)
1 1/2
Shower stall (2 or 3 shower heads)
2
Shower stall receptor receiving discharge from:
4 to 5 shower heads
3
Over 5 shower heads
4
Dishwasher, commercial
2
Sink, dishwasher, residence
1 1/2
Sink, kitchen, residence, single or double compartment
1 1/2
Sink, kitchen, residence, 3 compartments
2
Sink pot or scullery, hotel or public
2
Sink, soda fountain or bar
1 1/4
Sink, service or mop receptor
3
Urinal, stall
2
Urinal, through
1 1/2
Urinal, wall
1 1/2
Wash fountain
2
Wash sink, 6 feet
1 1/2
Wash sink, more than 6 feet
2
B. 
No trap or fixture drain shall be less than 1 1/4 inches, except as provided for in § 131-84E.
C. 
The fixture drains for water closets, trap standard service sinks, pedestal urinals and other fixtures with integral traps shall be not smaller than the fixture outlet, and for pedestal urinals, drains shall be not less than three inches and for water closets, not less than three inches.
D. 
Each fixture trap shall have a water seal of not less than 1 1/2 inches and not more than four inches. When a trap is required on a rainwater conductor, the seal shall be not less than four inches.
A. 
An easily accessible cleanout shall be provided at or near the foot of each vertical waste or soil stack. A test fitting with an iron-pipe-size screw opening as prescribed in § 131-119 may serve as a cleanout.
B. 
Any bolted or screwed floor or wall connection of a fixture trap shall be regarded as a cleanout.
C. 
Cleanouts in horizontal drainage lines of four-inch nominal diameter or less shall be not more than 50 feet apart and not more than 100 feet apart for larger pipe sizes. Cleanouts as required in Subsection A may be used in lieu of cleanouts in horizontal drainage lines as required in this subsection.
D. 
Material and design. The bodies of cleanout ferrules shall conform in thickness to that required for pipe and fittings of the same metal and shall extend not less than 1/4 inch above the hub. For new work, the cleanout plug shall be of heavy brass, not less than 1/8 inch thick, or nylon resin and shall be provided with raised nut or recessed socket for removal. Both the ferrule and plug shall have American National tapered pipe threads. Heavy lead plugs may be used for repairing a cleanout where necessary.
E. 
Size. Cleanouts shall be of the same nominal size as the pipes into which they are installed, up to four inches, and not less than four inches for larger pipes.
F. 
Accessibility. All required cleanouts shall be located so as to be readily accessible.
(1) 
The openings of all underground or below-floor cleanouts in a building shall be flush with or, preferably, above the floor, or shall be accessible in manholes or through access doors.
(2) 
Exterior underground cleanouts shall be extended to the surface or otherwise made accessible.
(3) 
Cleanouts concealed in or in back of walls or ceilings shall either be extended to the exposed surface of such walls or ceilings or shall be accessible through access doors.
(4) 
Cleanouts on four-inch or larger pipes shall be so installed that there is a clearance of not less than 18 inches for rodding.
(5) 
Cleanouts smaller than four inches shall have not less than six-inch clearance.
A. 
Whenever the waste discharged into a drainage system contains or is likely to contain substances which hinder sewage disposal, such as nonsoluble, flammable or hazardous substances, an approved interceptor shall be installed which effectively prevents such substances from entering the public sewer.
B. 
Interceptors shall not be required for fixtures installed in dwelling houses or dwelling units.
C. 
All interceptors shall be so designed that they will not become air-bound or permit siphonage. They shall be located so as to be readily accessible for cleaning and inspection.
D. 
The flow rate through an interceptor shall not exceed its rated capacity, and the interceptor shall operate at a minimum overall efficiency of 90% while draining the fixture in two minutes.
E. 
Grease interceptors shall have a flow-control fitting with an external cleaning device.
F. 
No interceptor shall be considered a trap unless the outlet is at least 1 1/2 inches above the inlet.
G. 
All fixture outlets shall be individually trapped, all traps shall be properly vented, and a fresh air inlet or vent shall be installed on the house side of the interceptor.
H. 
The outlet of the interceptor shall have a vacuum breaker or vent.
131e 31H.tif
A. 
An approved oil interceptor shall be installed in the drainage systems of the buildings or other structures and parts of buildings or other structures and premises of the following uses or occupancies:
(1) 
Commercial garages, repair shops, service stations, trucking docks and any other place where gasoline or other flammable liquid with a flash point less than 90° F. is dispensed or regularly used in connection with the work performed or processes employed.
(2) 
Dry cleaners or dyers using solvents.
(3) 
Paint, lacquer or varnish factories.
(4) 
Printing ink manufacturing plants.
B. 
Oil interceptors shall be constructed so as to be oiltight and shall have easily removable, water and gastight covers.
C. 
Every oil interceptor shall have a separate vent on the terminal end of the inlet piping and a fresh air inlet on the sewer side of the interceptor tank to relieve vapor. The size of the fresh air inlet shall be not less than two inches in size, connected to the interceptor tank, extended to the outer air in accordance with § 131-26 or to any location approved by the Plumbing Inspector.
D. 
Construction. If the construction is of masonry type, it shall be of reinforced concrete and the base, baffle wall and exterior walls shall be not less than six inches thick; or construction may be of eight-inch sewer brick parged to a smooth finish on the interior walls; or construction may be of eight-inch, 75% solid concrete block parged to a smooth finish on the interior walls. Other materials may be used when approved by the Plumbing Inspector. Adequate access to each compartment of the intercepting tank shall be provided by an eighteen-inch manhole and removable cover. Manhole covers shall be cast iron or precast reinforced concrete set into a retaining ring, and each cover shall weigh not less than 63 pounds. Manholes shall be brought up to grade and shall be watertight and gastight.
131f 32D.tif
A. 
An approved grease interceptor shall be installed wherever grease, as a product or by-product, may be introduced into a drain system in sufficient quantity to cause line stoppage or hinder sewage disposal, and they shall be installed in connection with the following uses or occupancies:
(1) 
All wastes in meat preparation areas, pot sinks, dishwashing machines and can washers for public eating places, institutions and schools.
(2) 
Slaughterhouses and meat packing or processing plants.
(3) 
Rendering plants.
(4) 
Soap factories.
B. 
When a grease interceptor is installed, it shall be located as near as possible to the fixture or fixtures served and shall be readily accessible for cleaning.
C. 
Grease interceptors shall be constructed of impervious materials capable of withstanding shock from hot and cold water, shall be watertight and shall be equipped with easily removable, watertight and gastight covers.
D. 
The trap seal on grease interceptors shall be not less than four inches and shall conform to § 131-24B.
An approved hair or lint interceptor shall be installed wherever hair or lint, in sufficient quantity to cause line stoppage, may be introduced into the drainage system, and they shall be installed in connection with the following uses or occupancies:
A. 
Commercial, institutional, hotel, club or other laundries equipped with commercial-type laundry equipment.
B. 
Beauty parlors and training schools for operators having six or more lavatories draining to a common house drain.
C. 
Dry-cleaning establishments.
D. 
Hide- or fur-processing plants.
E. 
Establishments having laundry equipment on the premises for public hire.
Sand and similar interceptors shall be designed and located so as to be readily accessible for cleaning and shall have a trap seal of not less than six inches.
A. 
The wastes from stables, barns, stable yards, barn yards, manure pits and subsurface drainage pipes shall pass through an intercepting catch basin before entering the house drain, lateral or public sewer.
B. 
Floor drains shall be equipped with removable basket strainers wherever necessary to prevent solids which might cause line stoppage from entering the drainage lines.
A. 
The efflux from a domestic grinder when in operation shall be carried off by and through a trap and waste pipe of at least 1 1/2 inches inside diameter. The efflux from a commercial grinder when in operation shall be carried off by and through a trap and waste pipe of at least two inches inside diameter. The waste pipe from a domestic garbage grinder and the waste pipe from a commercial garbage grinder shall not exceed in length more than 12 feet from a vented soil or waste connection. Garbage grinders shall not be installed on a waste where an interceptor is required under § 131-33A.
B. 
Domestic garbage grinders may be installed when the drainage system is connected to a Borough sewer or sewers which are in turn so arranged as to discharge this sewage into a sewage treatment plant. Commercial garbage grinders shall be connected to a separate system sanitary sewer leading to a sewage treatment plant. Whenever such public sewers are unavailable, domestic garbage grinder drainage and commercial garbage grinder drainage shall be in accordance with Article XIV.
(1) 
Identification. When applying for a permit to install a domestic garbage grinder or a commercial garbage grinder, the model number and manufacturer's name shall be permanently identified by a plate or by indented marking on each grinder installed.
(2) 
Testing and approval. The testing and approval of all garbage disposal units shall be authorized by and under the jurisdiction of the Plumbing Inspector.
A. 
Sewer gate valves shall be of the manually operated, nonrising stem type or may be of the swinging disk, back-pressure type or any other type of back-pressure valve approved by the Plumbing Inspector.
B. 
Sewer gate valves shall be constructed of corrosion-resistant material.
C. 
Sewer gate valves, when fully open, shall have a free-opening cross section not less than the pipe in which they are installed.
131g 37C.tif