- A combination fixture having 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.
- Kitchen sinks with two compartments of different levels and having a continuous waste and one trap. The
trap and waste line shall be 1-1/2 inches minimum.
- Kitchen sinks with three compartments, where one or more may be of different levels and having continuous waste and one trap. In accordance with Section P-506.1, the trap and waste line shall be 2 inches minimum.
- A set of three single compartment laundry trays which are connected to one trap, provided that the waste
outlets are no more than 30 inches apart, and the trap is centrally located.
- Dishwasher wastes which are discharged through a directional flow fitting located in the sink fixture trap or
in the garbage grinder, provided a fixture drain loop is installed on the dishwasher waste to the highest point
below the fixture rim and the distance on center between the waste outlets of the sink and the dishwasher
does not exceed 6 feet.
- Buildings of Use Group R-1.
- Buildings of Use Group R-2 containing more than 8 stories of dwelling units.
- Where trap joints are soldered, solvent cemented or screwed so as to form a solid connection.
|Fixture||Minimum Size of Trap & Fixture Drain
|Bathtub (with or without shower)||1 1/2|
|Combinations Fixture (not over 2 compartments on the same level)||1 1/2|
|Domestic Washing Machine||1 1/2|
|Drinking Fountain or Electric Water Cooler||1 1/4|
|Fountain Cuspidor (Dental chair)||1 1/4|
|Laundry Tray (1 or 2 compartments)||1 1/2|
|Laundry Tray (3 compartments)||2|
|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
over 5 shower heads
|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, Service or mop receptor||3|
|Sink, Soda Fountain or Bar||1 1/4|
|Urinal, Trough||1 1/2|
|Urinal, Wall||1 1/2|
|Wash Sink, 6 ft.||1 1/2|
|Wash Sink, more than 6 ft.||2|
- Commercial garages, auto repair shops, service stations, trucking docks, and any other place where gasoline or other flammable liquid with flash-point less than 90° F is dispensed or regularly used in connection with the work performed or processes employed;
- Dry cleaners or dyers using solvents;
- Paint, lacquer, or varnish factories;
- Printing in manufacturing plants.
- Reinforced concrete with the base, baffle wall and exterior walls not less than 6-inches thick; or
- 8-inch sewer brick parged to a smooth finish on the interior walls; or
- 8-inch 75% solid concrete block parged to a smooth finish on the interior walls; or
- Other materials as approved by the Department.
- All wastes in meat preparation areas, pot sinks, dishwashing machines and can washers for public eating places, institutions, and schools;
- Slaughterhouses and meat-packing or meat-processing plants;
- Rendering plants;
- Soap factories.
- Commercial, institutional, hotel, club or other laundries equipped with commercial-type laundry equipment;
- Beauty parlors and beauty operator training schools having 6 or more lavatories draining to a common house drain;
- Dry cleaning establishments;
- Hide or fur processing plants;
- Establishments having laundry equipment on the premises for public use.
- Manually-operated rising stem type;
- Swinging disk back pressure type; or
- Any other type of back pressure valve approved by the Department.