A. 
General. Wastes from certain fixtures as defined herein shall discharge to the building drainage system through an approved air break or air gap except that an air gap is required where the indirect waste pipe may be subject to vacuum (less than atmospheric pressure).
B. 
Air gaps and air breaks.
(1) 
Methods of providing an air gap. The air gap between the indirect waste and the building drainage system shall be at least twice the effective diameter of the drain served and shall be provided by one of the following methods.
(a) 
To a Receptor: Extend the indirect waste pipe in an open accessible individual waste sink, receptor, or other suitable and acceptable fixture which is properly water supplied, trapped and vented. The indirect waste shall terminate a sufficient distance above the flood level of the receiving fixture to provide the required air gap in the drain connection in accordance with this Code.
(b) 
To the inlet side of a trap: Provide an air gap in the drain connection on the inlet side of the trap which receives the waste from the indirect waste.
(2) 
Methods of providing an air break. A piping arrangement in which a drain from a fixture, appliance, or device discharges indirectly into a fixture, receptacle, or interceptor at a point below the flood level rim of the receptacle.
C. 
Food handling. In the case of food handling establishments engaged in the storage, preparation, selling, processing, or otherwise handling food, indirect waste piping shall be provided for certain fixtures, a list appears in § 860-129G. Dishwashing sinks and culinary sinks are excluded from this requirement unless such receptacle is used for soaking or washing ready to serve food. The indirect waste shall discharge over a properly installed and vented safe waste receptor, service sink or other fixture which may be approved by the Administrative Authority, or through an air gap or air break on the inlet side of a properly waste and vented trap.
D. 
Connections from water distribution system. Indirect waste connections shall be provided for drains, overflows, or relief vents from water distribution system by means of an air gap or air break in accordance with the provisions of Subsection B.
E. 
Sterilizers. Appliances, devices, or apparatus such as stills, sterilizers and similar equipment requiring waste connections and used for sterile materials shall be indirectly connected by means of an air gap in accordance with the provisions of Subsection B.
F. 
Dishwashing machines and potato peelers. Residential dishwashing machines, those in private living quarters or dwelling units, shall be indirectly connected by means of an air break, except where the manufacturer has provided a built in air gap or air break no additional air gap or air break will be required. When a commercial dishwashing machine or potato peeler is located adjacent to a floor drain, the waste from the dishwashing machine or potato peeler may be connected direct on the sewer side of the floor drain trap, provided that the drain line from the dishwashing machine or potato peeler is properly trapped and vented.
G. 
Clear water wastes. Water lifts, expansion tanks, cooling jackets, sprinkler systems, drip or overflow pans, or similar devices which waste clear water only, when emptying into the building drainage system, shall discharge through an indirect waste by means of an air gap in accordance with the provisions of Subsection B.
H. 
Pressure tanks, boilers and relief valves. The drains from pressure tanks, boilers, relief valves and similar equipment before connecting to the drainage system shall discharge through an indirect waste by means of an air gap by terminating such drains over a floor drain or other acceptable receptor.
I. 
Swimming pools. Pipes carrying waste from swimming or wading pools including pool drainage, back wash from filters, water from scum gutter drains shall be installed as an indirect waste. Floor drains serving walks around pools may be connected directly to the drainage system provided they are properly trapped and vented.
(1) 
Where wastes from swimming pools can drain by gravity to building drainage system, they shall discharge by an indirect connection (air break) to a proper trapped and vented receptor.
(2) 
Where gravity drainage is not possible, the circulation pumps may be utilized to lift the waste water to the gravity drainage system. The connection to the drainage system shall be through an air break to a properly trapped and vented receptor.
(3) 
Where gravity drainage is not possible, and the circulation pumps are not used to lift waste water, pool drainage shall discharge indirectly to a sump or receiving tank. The contents of said sumps or tanks shall be automatically lifted and discharged into the building gravity drainage system, (refer to State Regulations and Requirement). A back water valve and gate valve shall be installed in the discharge line of such sump or tank. The construction of said sump or tank shall be as required for all clear water sumps, as outlined in Article XIV, § 860-166, of this Code.
(4) 
Swimming pools shall be provided with at least one drain outlet so located that the entire pool can be emptied, and the drain shall be equipped with a readily accessible gate valve. All pool drain outlets shall be equipped with gratings having an area of not less than four times the cross-sectional area of the outlet pipe. The grating shall be of such design so as they can not be removable by bathers and will not injure bathers fingers. The drain outlet and the drain piping shall be of such size as to permit the pool to be completely drained, but shall be not less than three inches in size. Water drained from pools shall not be discharged to the sewer system during periods of rain or storms or when the system is under heavy use. At no time shall the rate of drain water discharge exceed a flow of 250 gallons per minute. Recirculation lines from scum gutters and pools shall be of a material acceptable to the Administrative Authority, but shall not be less in quality than materials which are unaffected by chlorine or either compounds or chemicals used in water treatment in swimming pools.
A. 
Installation. Waste receptors serving indirect waste pipes shall not be installed in any toilet room, nor in any inaccessible or unvented space such as a closet or a store room.
B. 
Cleanout location. If the trap of the indirect waste receptor is not readily accessible or is set below floor level, it shall be equipped with running trap adjacent thereto with the trap cleanout brought level with the floor.
C. 
Splashing to be prevented. All plumbing receptors receiving the discharge of the indirect waste pipes, shall be of such shape and capacity as to prevent splashing or flooding.
D. 
Domestic or culinary fixtures prohibited as receptors. No plumbing fixture which is used for domestic or culinary purposes shall be used to receive the discharge of an indirect waste except that in a residence a kitchen sink is acceptable for use as a receptor for portable dishwashers and similarly a laundry tray as a receptor for a clothes washing machine.
E. 
Stand-pipe receptors. The stand-pipe receptor for an automatic clothes washer shall be individually trapped and vented, and the top of the stand pipe shall be 36 inches above finished floor level, or not less than 18 inches above its trap, however, when the trap is located under the floor, the stand-pipe shall extend a like distance above the floor. When the trap is located under the basement or cellar floor, a clean out of the same trap size will be required and the stand pipe shall be two inches in diameter above the floor or a running trap with a full size clean out and a two inch diameter stand pipe will be located within two feet of its intended use.
F. 
Installation requirements for indirect waste piping.
(1) 
Except as hereinafter provided, the size and construction of indirect waste piping shall be in accordance with other sections of this Code applicable to drainage and vent piping. Vertical indirect waste stacks, rising two or more branch intervals shall extend separately to the outside air. No vent from indirect waste piping shall combine with any sewer connected vent.
(2) 
Indirect waste pipe exceeding two feet in length shall be trapped, but such traps need not be vented. Indirect waste pipes less than two feet in length need be no larger in diameter than the drainage outlet or tailpiece of the fixture, appliance or equipment served, but in no case less than 1/2 inch in size. Changes of direction in indirect waste pipes shall be provided with clean outs.
(3) 
Appliances which discharge only clear water wastes as defined in Section § 860-128G and are not involved with food handling or storage need not be trapped at the point of reception and may be drained to a common safe waste receptor.
G. 
Indirect Waste Table — Appendix A.
Trap Size
Fixture Unit
Type of Fixture
2"
2
Bain-Marie (Steam Table)
3/4"
1/2
Beer Dispenser
1 1/2"
2
Chinese Range (Water cooled top)
3/4"
1/2
Coffee Urn
3/4"
1/2
Cold Pan
1"
1
Dipper Well
2" or 3"
3 or 5
Dishwasher
3/4"
1/2
Egg Boiler
1"
1
Food Display Cases — meat-poultry-fish salad and vegetables)
3/4"
1/2
Food Warmer
1"
1
Hood Washer
3/4"
1/2
Ice Bin
3/4"
1/2
Ice Box
1"
1
Ice Cream Dispenser (soft serve)
3/4"
1/2
Ice Making Machine
2"
3
Potato Peeler
3/4"
1/2
Refrigerator Coil
1 1/2"
2
Rinsing Sink (Bar Sink)
1"
1
Soda Fountain
1 1/2"
2
Steam Kettle
1"
1
Waitress Station (glass filler)
4"
5
Walk-in Refrigerator
Below Ground
3"
4
Above Ground
A. 
Condenser tanks. No steam pipe shall connect to any part of a drainage or plumbing system, nor shall any water above 140° F. be discharged into any part of a drainage system except where cooling methods are provided which automatically cool the discharge to 140° F. or less, before being discharged to the building drainage system. If potable water is used with a direct connection to the cooling apparatus, a backflow preventer shall be installed in the potable water supply. Where condensate or blow-off tanks are used to lower temperatures, the tank shall be sized to a capacity of 1/3 the total water capacity of the vessel or vessels discharging into the tank. The tank shall be vented independently through the roof with a galvanized wrought iron vent pipe not less than two inches in size. The overflow or discharge from the tank shall be properly trapped and vented before connecting to the building drainage system. The trap shall be not less than 1 1/2 inches in size, or larger when warranted, based on gallon per minute discharged or each GPM being equal to one fixture unit, when the overflow or discharge pipe is submerged inside the tank forming its own integral trap an additional trap will not be required, but the integral trap shall be vented by a proper size vent.
B. 
Acid or chemical wastes.
(1) 
In no case shall corrosive liquids, spent acids, strong alkalies, or other chemicals which might destroy or injure a drain, soil, waste or vent pipe, or which might create noxious fumes, be discharged into the regular sanitary drainage system. Such chemicals shall be discharged through an independent acid-resisting drainage system. When conditions permit, as deter-mined by the Administrative Authority, the complete building acid waste system shall drain into a neutralizing tank before connecting into the sanitary system, and the owner must submit a cleaning and inspection schedule to the Administrative Authority when the plans are filed.
(2) 
When a plan is filed the Administrative Authority shall notify the appropriate Sewage Treatment Plant Authority. Where means are provided for the dilution or neutralization of such chemicals by passage through an approved dilution or neutralization device for which adequate maintenance is assured, such treated wastes may be discharged into the regular sanitary drainage systems. Acid or chemical waste and vent piping shall be of material resistant to the corrosive action of chemicals and fumes as approved in Article V, § 860-66.
C. 
Installation requirements for acid or special wastes. Acid or chemical installations shall be sized, drained, vented and installed in a like manner as any other sanitary drainage system contained in this Code. Cup sinks on chemical laboratory tables may be assigned a one-half fixture unit value for determining pipe sizes.
Indirect waste fixtures or appliances, acid or special wastes not covered in this chapter will be considered individually by the Administrative Authority.