~ \ 1.) GENERAL a. Definitions: Chapter B Code References (1) Air-break Comm 81.01 (5) (2) Air-gap, drain system Comm 81.01 (6) (3) Flood level rim Comm 81.01(102) (4) sink Comm 81.01(105) (5) Indirect waste piping Comm 81.01(131) (6) Local waste piping Comm 81.01(145) (7) Receptor Comm 81.01 (201) (8) Standpipe Comm 81.01 (235) (9) Waste sink Comm 81.01 (275) b. Materials Comm 82.33(2) and Table 84.30-1 c. Direct or indirect? (1) All plumbing fixtures and appliances shall connect directly to a drain system Comm 82.32 (5) (2) Fixtures & appliances with a public health concern shall discharge to a drain system by means of an air-gap or air break Comm 82.33 (1)(b) 2.) INDIRECT WASTE PIPING a. Size of indirect waste piping (1) More than 30" in length Comm 82.33(3) & Comm 82.30 & Table 82.30-1, -2 & -3 (2) 30" or less in length - permitted to be same size as strainer or drain outlet (3) Refrigerated food display cases Comm 82.33(3)(a) 1" for 20 feet (4) Appliances with pressurized wastes Comm 82.33(3)(b) b. Traps for indirect waste piping (1) Gravity flow wastes more than 30" in length Comm 82.33(5)(a)1. & Comm 82.32(4) (2) Gravity flow wastes 30" or less in length - no trap required (3) Indirect waste piping draining a sterilizer Comm 82.33(5)(a)1. no trap c. Maximum length of indirect waste piping (1) Maximum 30' length horizontally Comm 82.33(6) (2) Maximum 15' length vertically Comm 82.33(6) (3) If both indirect & local waste piping installed - limited to 30' horizontally & 15' vertically combined Comm 82.33(6) d. Installation Comm 82.33(4) 3.) LOCAL WASTE PIPING a. Size of local waste piping (1) More than 30" in length Comm 82.33(3) & Comm 82.30 & Table 82.30-1, -2 & -3 (2) 30" or less in length Comm 82.33(3) & Comm 82.30 & Table 82.30-1, -2 & -3 r' (3) Refrigerated food display cases Comm 82.33(3)(a) 1" for 20 feet b. Traps for local waste piping 81
Code References (1) Local waste piping handling sanitary wastes more than 30" in length Comm 82.33(5)(b) & Comm 82.32(4) (2) Local waste piping handling sanitary wastes 30" or less in length - no trap required c. Maximum length of local waste piping (1) Maximum 30' length horizontally Comm 82.33(6) (2) Maximum 15' length vertically Comm 82.33(6) (3) If both indirect & local waste piping installed - limited to 30' horizontally & 15' vertically combined Comm 82.33(6) d. Local waste may not receive discharge from another local waste Comm 82.33(8)(c) e. Installation Comm 82.33(4) 4.) APPROVED RECEPTORS a. Prohibited use of fixtures as receptors Comm 82.33(8)(d) b. Design (1) Shape & capacity to prevent spilling or splashing Comm 82.33(8) (2) Accessible Comm 82.33(8) c. sinks Comm 82.33(8)(b) d. Waste sinks Comm 82.33(8)(a) e. Standpipes Comm 82.33(8)(a) f. Limited permitted use of fixtures as "other receptors" Comm 82.33(8)(d)1. thru 7. 5.) INDIRECT WASTE PIPING REQUIRED a. Boilers, pressure tanks & relief valves Comm 82.33(9)(a) b. Clear water Comm 82.33(9)(b) c. Clothes washers Comm 82.33(9)(c) ( 1) Residential types Comm 82.33(9)(c)1. (2) Self-service laundries Comm 82.33(9)(c)2. (3) Commercial Comm 82.33(9)(c)3. d. Dishwashers Comm 82.33(9)(d) ( 1) Residential types Comm 82.33(9)(d)1. (2) Commercial Comm 82.33(9)(d)2. e. Drips & drain outlets Comm 82.33(9)(e) f. Elevator drains Comm 82.33(9)(f) 6.) FOOD HANDLING ESTABLISHMENTS a. Bar sink installation (1) Direct connection required if installation permits Comm 82.33(9)(g)1. (2) Indirect & local waste piping not trapped Comm 82.33(9)(g)1.a. (3) Indirect & local waste piping with trap Comm 82.33(9)(g)1.b. 82
(4) (5) Chapter B Code References Venting of bar & soda fountain sink Comm 82.33(9)(g)1.a. Illustrations Appendix Comm 82.33 (6) b. Beer taps, coffee makers, glass fillers & soda dispensers (1) Type of discharge Comm 82.33(9)(g)2. (2) Size of indirect waste piping over 30" in length a) Beer taps Table 82.30-1 b) Coffee maker Table 82.30-1 c) Glass filler Table 82.30-1 d) Soda dispenser Table 82.30-1 c. Ice compartments, dipper wells & novelty boxes (1) Length of indirect waste piping Comm 82.33(9)(g)3.a. (2) Discharge of waste though air-gap Comm 82.33(9)(g)3. (3) Traps on local waste piping Comm 82.33(5)(b) (4) Maximum length of local waste piping with trap Comm 82.33(6) (5) Air-gaps required Comm 82.33(9)(g)3. (6) Size of indirect waste over 30" in length Comm 82.33(3)(a)&(b) & Table 82.30-1 d. Enclosed food processing equipment Comm 82.33(9)(g)5. e. Food preparation Comm 82.33(9)(g)6. 7.) OTHER FIXTURES/APPLIANCES REQUIRING INDIRECT WASTE PIPING a. Sterilizers Comm 82.33(9)(h) b. Cross connection control devices/assemblies Comm 82.33(9)(i) c. Vacuum systems - central units Comm 82.33(9)0) d. Swimming pools Comm 82.33(9)(k) e. Water treatment devices Comm 82.33(9)(i) (1) Waste discharge of water treatment device Comm 82.41 (2) Indirect waste piping or tubing -water distribution material Table 84.30-8 or Table 84.30-11 83
Code References INTENTIONALLY LEFT BLANK 84
Indirect waste piping requirements Definition: indirect waste piping refers to drain piping which connects indirectly with the drain system as per Comm 81.01 (131 ). It should be noted that indirect waste piping connects directly to the fixture/appliance which is being drained. Size: the size of the indirect waste pipe when more than 30" in length is sized using Table 82.30-1 & Table 82.30-2. If the indirect waste pipe is 30 inches or less in length, it is permitted to be the same size as the drain connection on the fixture as per Comm 82.33 (3) (a) & (b). Trap required: gravity flow indirect waste piping more than 30" in length shall be provided with a trap as per Comm 82.33 (5) (a); when the piping is 30" or less, a trap is not required. A trap is required regardless of length if draining a refrigerated food storage room or compartment. Approved material: indirect waste piping more than 30" in length shall be approved materials as per Comm 84. Maximum length: indirect waste piping shall not be longer than 30' horizontally or 15' vertically as per Comm 82.33 (6). Bar Sink Indirect waste piping 30' max horizontally 15' max vertically Local waste piping minimum 1 1/2" outlet of receptor Receptor (floor sink) r---t 2" trap serving 2" receptor outlet 2" receptor = 3 dfu Ice Chest Table 82.30-1 '---...---' 0.5 dfu 3.0 dfu Bar Sink Indirect waste pipe-1--size as per max 30" length w/o trap manufacturer 1" above floor. See _j_ /Air-gap Comm 82.33 (8) (a)- Standpipe receptor min 1 1/2" diameter as per Table 82.30-1 Standpipe receptor min 1 1/2" diameter Table 82.30-1 85
Chapter 8 Local waste piping requirements Bar Sink Appliance/Fixture Indirect waste piping 30" max length without trap 3.0 dfu /Air-gap or air-break Local waste piping 30" max length without trap Air-gap or air-break""- Indirect waste piping with trap minimum 1 1/2" /Air-gap or air-break Trap Definition: local waste piping receives the wastes discharged from indirect waste piping as per Comm 81.01 (145). Local waste does not connect directly with indirect waste piping and does not connect directly with the receptor into which it discharges. Size: all local waste piping shall be sized in accordance with Table 82.30-1 & Table 82.30-2. See Comm 82.33 (3) (a). Trap required: local waste piping handling sanitary wastes and more than 30" in length shall be provided with a trap as per Comm 82.33 (5) (b). Local waste piping 30" or less in length does not require a trap. Approved material: all local waste piping shall be approved materials as per Comm 84. Maximum length: local waste piping handling sanitary wastes shall not be longer than 30' horizontally or 15 feet vertically as per Comm 82.33 (6). Local waste piping with trap minimum 1 1/2" '---Combined length of indirect & local 30' max horizontally & 15' vertically~ /Air-gap or air-break Receptor Trap Maximum length: the combined maximum length permitted for indirect waste piping and local waste piping is 30' horizontally and 15' vertically as per Comm 82.33 (6). 86
Air-gap & Air-Break Air-gap(drain) definition: Comm 81.01 (6). Air-break definition: see Comm 81.01 (5). Air-gap installation: Comm 82.33 (7) (a) 1. & 2. Minimum air-gap: The minimum air-gap for indirect waste pipes 1" or less shall be at least twice the diameter of the indirect waste piping and for pipes larger than 1 ", the air-gap shall be a minimum of 2". See Comm 82.33 (7) (a). Air-break installation: see Comm 82.33 (7) (b). Extend below flood level rim of receptor and terminate above the trap outlet Indirect waste pipe ~ocal waste pipe, I/ Air-gap Receptor Indirect waste pipe size: 3/4" 1" 1 1/4" 1 1/2" 2" 1 1/2"" 2" 2" 2" 2" Measuring the air gap: The air-gap is always measured from the lowest point of the indirect waste piping to the flood level rim of the receptor. ~Indirect waste piping.... V... L.... Air-gap... r.. Receptor Air-gap or Air-break: All indirect & local waste piping shall discharge by means of an air-gap or air-break into a receptor. Comm 82.33 (7) Some fixtures/appliances require "air-gap": Boilers Comm 82.33 (9) (a) Clear water waste Comm 82.33 (9) (b) Coffee urns Comm 82.33 (9) (g) 5. Ice compartments Comm 82.33 (9) (g) 3. Vending machines Comm 82.33 (9) (g) 5. Food-prep sinks Comm 82.33 (9) (g) 6. Some fixtures/appliances require "air-break": Residential automatic clothes washers Comm 82.33 (9) (c) 1. Some fixtures/appliances permit either: Dishwashing machines Comm 82.33 (9) (d) Bar sinks Comm 82.33 (9) (g) 1. Coffee makers Comm 82.33 (9) (g) 2. B7
Approved Receptors - Waste Sinks & Sinks Receptor: "means a fixture or device that receives the discharge from indirect or local waste piping." See Comm 81.01 (201 ). Comm 82.33 (8) requires a receptor to be of a shape & capacity as to prevent spashing or flooding. The receptor must be sized for the maximum discharge from all indirect & local waste pipes discharging into the receptor. Waste sink: "means a receptor for the discharge from indirect or local waste piping installed with its flood level rim above the surrounding floor." See Comm 81.01 (275). Comm 82.33 (8) (a) requires a waste sink serving as a receptor to be installed with its rim one inch above the floor.. Note: A plumbing fixture may not be used as a receptor for indirect or local waste piping. Waste Sink Min 1" _L /abv floor A waste sink shall have its rim at least one inch above the floor. See Comm 82.33 (8) (a). A mop sink without a faucet above may be used as a waste sink. A mop sink with a faucet above is not permitted to be used as a receptor for indirect waste piping. sink: "means a receptor for the discharge from indirect or local waste piping installed with its flood level rim even with the surrounding floor." See Comm 81.01 (105). Comm 82.33 (8) (b) requires a floor sink to be equipped with a removable metal basket or a dome strainer. Indirect waste piping or local waste piping shall not discharge through a traffic grate, but shall terminate over an ungrated portion of the floor sink. Receptor Sink ttl tal Watts FS-730 12" square x 6" deep Watts FS-850 16" square x 12" deep Receptor outlet connection sizes available in 2", 3" & 4" 2" trap & fixture drain used = 3 dfu 3" trap & fixture drain used = 4 dfu 4" trap & fixture drain used = 6 dfu Size of Receptor: Table 82.30-1 refers to receptors of indirect wastes (gravity flow discharge). If a receptor has a 1 1/4" outlet diameter, the minimum trap size required to serve the receptor is 1 1/4" and the drainage fixture unit load assigned to the 1 1/4" receptor is 1 dfu. If a receptor has a 4" outlet diameter, the minimum trap size required is 4" and the dfu load assigned to the 4" receptor is 6. sinks are available in a variety of sizes. Watts FS-730 floor sink measures 12" x 12" x 6" deep. Watts FS-850 is 16" x 16" x 12" deep. The FS-730 is available with a 2", 3" or4" drain outlet connection. In applying Table 82.30-1 the size of a floor sink receptor is determined by the size of the outlet connection, not the size of the floor sink itself. If Watts FS-730 (12" x 12" x 6") is used with 2" drain outlet, a minimum 2" trap & 2" fixture drain are required. The drain load assigned to the 2" receptor is three dfu. If the Watts FS-730 is used with a 4" drain outlet, a 4" trap is required & assigned a drain load of 6 drainage fixture units. 88
Approved Receptors - Standpipes Standpipe: "means a drain pipe serving as a receptor for the discharge wastes from indirect or local waste piping." See Comm 81.01 (235). Comm 82.33 (8) (a) reqires a standpipe serving as a receptor to be installed with its rim one inch above the floor. Minimum~.. Indirect or Local waste piping ~ Air-gapor above floor""'" _l ' 1/Air-break I I I I standpipe receptor above floor Fixture drain T Air-gap or /Air-break trap Receptor Trap A standpipe serving as a receptor shall have its rim at least 1" above the floor. See Comm 82.33(8) (a). Receptor size & Capacity: DFU capacity and trap sizes are listed in Table 82.30-1. Receptor size: shall be large enough and shall be of a shape to prevent splashing or flooding. See Comm 82.33 (8). Size of Receptor (standpipes): Table 82.30-1 refers to receptors of indirect wastes (gravity flow discharge). If a 1 1/4" standpipe receptor is used, the minimum trap size required to serve the receptor is 1 1/4" and the drainage fixture unit load assigned to the 1 1/4" receptor is 1 dfu. If a 4" standpipe receptor is used, the minimum trap size required is 4" and the dfu load assigned to the 4" standpipe receptor is 6. Standpipes must be sized for the maximum discharge of all indirect and local waste piping discharging into the standpipe. To facilitate the discharge from multiple indirect waste pipes, an increaser is often installed in the standpipe. In the lower left example below, a 3" x 6" increaser is installed. In applying Table 82.30-1 the size of a standpipe receptor is determined by the size of the standpipe outlet(3"), not the increaser(6"). If a 6" standpipe receptor size were required to receive the anticipated flow, a 6" trap & fixture drain would be required and a reduction in size would not be permitted. Indirect or Local waste piping ~ ~ Air-gap or Minimum~ 11/Air-break above floor""' _l Receptor 3" x 6" increaser - 3" standpipe Receptor 3" fixture drain 3" trap min required 3" receptor = 4 dfu Table 82.30-1 (3" receptor) r-~11/4"for40' 4 dfu 89 Indirect or Local waste piping ~ ~ Air-gap or Minimum~ 11/Air-break above floor""' _l 8 dfu 1 1/2" for 150' r:z-t 6" fixture drain 6" trap min required 6" receptor = 8 dfu Table 82.30-1
"Other Receptors" Kitchen sink: The indirect waste piping of a portable dishwasher or water treatment device serving one or 2 outlets may discharge into a kitchen sink of a dwelling unit or to a branch tailpiece serving a kitchen sink. See Comm 82.33 (8) (d) 1. Laundry tray: The indirect waste piping of an automatic clothes washer or water treatment device may discharge into a laundry tray. See Comm 82.33 (8) (d) 2. Branch tailpiece of a laundry tray: The indirect or local waste piping serving a cross connection control device or assembly, water treatment device, air conditioner, humidifier or furnace condensate may discharge into a branch tailpiece serving a laundry tray. See Comm 82.33 (8) (d) 3. drain riser: The local waste piping serving a water heater temperature and pressure relief valve, water treatment device, cross connection control device or assembly, humidifier, sterilizer, or a furnace or air conditioner may discharge into the riser of a floor drain when installed in accordance with sub. (7) (b). See Comm 82.33 (8) (d) 4. KS ow Indirect w ste Indirect waste piping~ Minimum 1, Drain 1 above floor _l_ Kitchen sink (branch tailpiece) & indirect waste local waste piping- 1 1/4" min 30" maximum length w/o trap drain riser Water Treatment Device EJ Indirect waste piping~ Minimum 1, J above floor Drain _l_ Laundry tray with indirect waste local waste piping- 1 1/4" min 30' max horizontally with trap drain riser B 10
"Other Receptors" served by floor drain: The indirect or local waste piping serving a water heater temperature and pressure relief valve, water treatment device, cross connection control device or assembly, or a furnace or air conditioner may discharge to a floor served by a floor drain so as not to create a health or safety hazard. See Comm 82.33 (8) (d) 5. Clear water sump: The indirect or local waste piping serving a water heater temperature and pressure relief valve or water treatment device may discharge through the cover of a clear water sump so as to not to adversely affect floats by means of a fixed air gap installed in accordance with subs. (7) (a) 2. and (8). See Comm 82.33 (8) (d) 6. Laboratory sink: The indirect waste piping serving a dental mold grinder may discharge into the riser of a trap serving a laboratory sink that is provided with a plaster trap and is installed within 3 feet of the mold grinder. See Comm 82.33 (8) (d) 7. lndirec waste piping approved water materials Table 84.30-87,11- ) Water Heater Indirect waste piping approved water distribution materials Table 84.30-8 Water Treatment Device -Sump pump discharge Drain Air /gap served by floor drain Clear water sump & pump Model Trimmer air-break Sink with plaster trap must be installed within 3 feet of the dental mold grinder Plaster trap Lab Sink & Dental Mold Grinder B 11
Sizing Receptors(Gravity Flow- Intermittent Flow) Identifying receptor size: The size of a floor sink receptor, waste sink receptor and standpipe receptors is identified by the size of the drain outlet connection chosen. A floor sink or waste sink with a 3 inch outlet is considered a 3" receptor & listed as 4 dfu (Table 82.30-1 ). A floor sink or waste sink with a 2 inch drain outlet is considere.d a 2" receptor & listed as 3 dfu. Selecting an adequate size for receptors: Table 82.30-1 lists the minimum trap size and dfu for commonly used fixtures and appliances. For an ice chest, the minimum size trap and fixture drain is listed as 1 1/2"; for a food prep sink the minimum size trap and fixture drain is 2". When selecting a receptor to receive the indirect waste from a single fixture/appliance, the minimum size permitted must be at least the minimum trap size listed in Table 82.30-1. An ice chest requires a minimum 1 1/2" diameter receptor. The minimum size receptor for a food prep sink is 2". Discharge from multiple fixtures: All receptors must have sufficient capacity to prevent splashing or flooding. The combined dfu load of all fixtures and/or appliances involved must be used to select the proper size receptor. Table 82.30-2 may be used as criteria for selecting the receptor size. The horizontal portion of the receptor's fixture drain would be limited by the capacity identified for "horizontal drain piping". As an example, a total discharge of 8 dfu would require a 3" diameter receptor, 3" trap & 3" fixture drain (Table 82.30-2 limits 1 1/2" horizontal drains to a maximum of 3 dfu, limits a 2" drain to 6 dfu and a 3" drain to a maximum of 20 dfu). fr2 dfu appliance 1 dfu fixture~ ~fu appliance... I I 4 df -d-.-h--.-._t t ;_...;..::._;;,.;_ 1 1/4" min u tsc argtng tn o recep or Sink 3 dfu Sink receptor with 2" diameter outlet capable of receiving 4 dfu as per Table 82.30-2 r---~ 2" trap = 3 dfu Table 82.30-1 (2" receptor) i Ice chest 0.5 dfu~ Commercial bar sink 3 dfu/ min 1 1/2" Food prep sink 3 dfu fixture 9.5 dfu discharging into receptor 3" diameter receptor capable of receiving 9.5 dfu as per Table 82.30-2 Sink r---~ 3" trap = 4 dfu Table 82.30-1 (3" receptor) 1 1/4" min ""-~ dfu 812
Sizing Receptors Another option for selecting the size of a receptor is provided in the appendix of chapter Comm 82. A-82.30 (4)- 2. Receptor Design. A table is given that lists the gpm & dfu that can be expected to readily flow through a given size trap with a specified height. Using this table, a total of 8 dfu discharging into a receptor would require a 4" trap & fixture drain. Note: the Feb, 2009 Appendix dfu values do not reflect the "intermittent" or "continuous" gpm to dfu equivalents identified in Comm 82.30(3)(a)2. & (b) gpm/dfu load l H J Fixture drain gpm/dfu load 1 J H Trap sized by Trap sized by Table 82.30-1 based on Table 82.30-1 based on Receptor size chosen DFU values identified in Receptor size chosen Appendix have not been updated ~ Receptor Trap Drainage ' Fixture Size H Units (in inches) (in inches) GPM (dfu) 1 1/2 2 3 4 5 6 8 12 14 15 17 20 22 25 4 8 12 40 70 120 250 2 4 6 20 35 60 125 Ice chest 0.5 dfu~ Commercial bar sinki 3 dfu/ min 1 1/2" Food prep sink 3 dfu fixture Bar sink 3 dfu/ min 1 1/2" 9.5 dfu discharging into receptor 4" diameter receptor capable of receiving 9.5 dfu as per Appendix 82.30 (4)- 2 1 1/2" min Sink ""\:.~ dfu r---~ 4" trap = 6 dfu Table 82.30-1 (4" receptor) B 13
Sizing Receptors & Related Piping Receptors of indirect waste, pressurized discharge: The load on drain piping downstream from a receptor serving fixtures/appliances with pressurized waste is determined by the dfu value of the fixtures/appliances discharging into the receptor. For example, a standpipe receptor for a residential clothes washer is required to be a minimum 2" diameter. The residential clothes washer is assigned a dfu value of 4. The load on the drain & vent piping downstream of the 2" standpipe receptor is 4. The dfu of a 2" receptor identified in Table 82.30-1 is not used to determine the size or load on drain & vent piping associated with the residential clothes washer. 2" standpipe receptor 2"/4 dfu 12 dfu I 3" horizontal piping hoirzontal piping B 14
Ice Compartments, Novelty boxes & Ice Cream Dipper Wells Ice Compartment/Novelty Box Table 82.30-1 0.5 dfu Indirect waste pipe--11--size as per max 30" length required manufacturer 1" above floor. See j_ /Air-gap Comm 82.33 (8) (a)- Standpipe receptor min 1 1/2" diameter as per Table 82.30-1 Dipper well Table 82.30-1 '--...--' 1. 0 dfu 2 dfu Size: the size of the indirect waste piping may be the same size as the drain connection on the fixture as per Comm 82.33 (3) Size: the size of any local waste piping shall be sized in accordance with Comm 82.30, specifically Table 82.30-1 & Table 82.30-2. See Comm 82.33 (3) Trap not required: Indirect waste piping for ice compartments, novelty boxes and ice cream dipper wells shall not exceed 30" in length as per Comm 82.33 (9) (g) 3. a. For these fixtures, a trap is not required. Any local waste piping less than 30" in length does not require a trap as per Comm 82.33 (5) (b) Maximum length: indirect waste piping serving these specific fixtures shall not exceed 30" in length as per Comm 82.33 (9) (g) 3. Any local waste piping not provided with a trap serving these fixtures may not exceed 30" in length; otherwise, local waste piping provided with a trap is permitted a maximum length of 30 feet horizontally and 15 feet vertically. See Comm 82.33 (5) (b) & (6). Standpipe receptor min 1 1/4" diameter as per Table 82.30-1 Refrigeration unit Indirect waste Max 30" w/o trap Condensate from Refrig coils Air-gap required: indirect waste piping from these types of fixtures shall discharge by means of an air-gap as per Comm 82.33 (9) (g) 3. See page 83 concerning air-gap. Separation of discharge wastes: indirect waste piping from novelty box or ice compartment may not discharge or connect to indirect waste piping or local waste piping of any other fixture other than another novelty tray or ice compartment. See Comm 82.33 (9) (g) 3. b. Ice Machine Indirect waste piping. Size based on manufacturer. 30" maximum length as per Comm 82.33 (9) (g) 3. Refrigerated ice bin requires trap as per Comm 82.33 (5) 2. 2" receptor outlet size 1 1/2" min for ice chest Table 82.30-1 2"@ 1/4" r-~ 1 1/4" min 2" receptor outlet = 3 dfu All downstream drain & vent piping sized based on 3 dfu B 15
Bar Sink Installation Options: If the bar sink is located in an area that prevents a direct connection & vented as specified in Comm 82.31, the sink drain shall discharge through indirect waste piping. Size: indirect waste piping more than 30 inches in length shall be sized by Tables 82.30-1 & 82.30-2; otherwise the indirect waste pipe may be the same size as the drain connection on the fixture as per Comm 82.33 (3) (a) & (b). Chapter B Bar Sinks 3.0 Dfu Bar Sink Indirect waste pipe-11-size as per max 30" length w/o trap manufacturer 1" above floor. See j_ /Air-gap Comm 82.33 (8) (a)- Trap required: gravity flow indirect waste piping more than 30 inches in length shall be provided with a trap as per Comm 82.33 (5) (a). Indirect waste piping 30" or less does not require a trap. Standpipe receptor min 1 1/2" diameter Table 82.30-1 Air gap: an air-gap is required when the indirect waste pipe is not trapped; otherwise, an air-break is permitted. Comm 82.33 (9) (g) 1. a. Bar Sink Maximum length: indirect waste piping shall not be longer than 30 feet horizontally nor 15 feet vertically as per Comm 82.33 (6). Receptor size: the minimum size receptor selected must reflect the criteria in Comm 82.30. The minimum size listed in Table 82.30-1 for a fixture or appliance is also the minimum size permitted for the receptor. Once a receptor size is determined, all downstream drain & vent piping is sized based on the dfu of the receptor, not the fixtures/appliances discharging into the receptor. See B 12 for more detail. Air-break permitted Standpipe receptor min 1 1 /2" diameter as per Table 82.30-1 1 1/2" trap min 2 dfu/ Table 82.30-1 Indirect waste piping minimum 1 1/2" Bar Sink Local waste piping, minimum 1 1/2" indirect & local combined may not exceed 30 feet horizontally & 15 feet vertically Note: sinks may be installed flush with the floor provided a removable, metal basket or a dome strainer is installed in the floor sink. See Comm 82.33 (8) (b). Note: A floor mounted janitor service sink which is provided with a water supply is not considered a legal receptor for indirect or local wastes. sink receptor 2" receptor outlet chosen r---? 2" trap serving 2" receptor outlet 2" receptor = 3 dfu B 16
Bar Sinks, Beer Taps & Ice Chest Beer tap wastes: the drip pan from a beer tap shall discharge to the sanitary system through indirect waste piping by means of an air-break or air-gap as per Comm 82.33 (9) (g) 2. When the indirect waste pipe is over 30 inches long it must be trapped as per Comm 82.33 (5) (a) and shall be sized according to Table 82.30-1. If the indirect waste pipe is not over 30 inches long, it does not require a trap and may be the same size as the drain connection of the fixture. Ice Compartments: shall drain independently to the sanitary drainage system through an indirect waste pipe 30 inches maximum and terminate with an air-gap. The indirect waste pipe may drain into a local waste pipe by means of an air-gap. That local waste pipe may then drain into a receptor by means of an air-break or air-gap. See Comm 82.33 (9) (g) 3. a. & b. Bar sinks: where possible a bar sink shall be directly connected to the sanitary drainage system. However, if it is not practical to do so, it may discharge to the sanitary system through indirect waste piping by means of an air-gap or air-break. See Comm 82.33 (9) (g) 1. b. Approved Receptors: for information on minimum sizes and other requirements, see B12. 0.5 dfu Beer Tap 0.5 dfu Ice Chest 3.0 dfu 4 Compartment Bar Sink Max.30"Q Air-break,ll-L ' Air-gap 1 1/2" 2" standpipe receptor 1 1/4" min-5--, Air-break 30 feet maximum horizontally 15 feet maximum vertically 2"@ 1/4" 2" trap serving 2" receptor = 3 dfu B 17
Bar Sinks, Beer Taps & Ice Chest Size: the minimum size of indirect waste pipe over 30 inches in length shall be sized as per Table 82.30-1. If 30 inches or less in length, the pipe may the same size as the connection at the fixture/appliance. The minimum size of all local waste piping shall be as per Table 82.30-1 & 82.30-2. Trap: indirect waste piping over 30 inches in length requires a trap; otherwise if 30 inches or less in length, a trap is not required. Local waste piping handling sanitary wastes and longer than 30 inches requires a trap; otherwise if the local waste is 30 inches or less in length, a trap is not required. Length: some fixtures/appliances (novelty box, ice chest, etc.) have a maximum indirect waste pipe length of 30 inches; otherwise the maximum length of all indirect waste pipe and local waste pipe is 30 feet horizontally and 15 feet vertically. Bar sinks: where possible a bar sink shall be directly connected to the sanitary drainage system. However, if it is not practical to do so, it may discharge to the sanitary system through indirect waste piping by means of an air-gap or air-break. See Comm 82.33 (9) (g) 1. b. Novelty Box 0.5 dfu 4 Camp Bar Sink 3.0 dfu Ice Chest 0.5 dfu Indirect waste piping 4.5 dfu into receptor.../.:11/4" )-, 2" standpipe receptor Local waste piping Non-refrigerated Ice compartment Non-refrigerated Ice compartment May be same size as tapping on equipment '---...---' Indirect waste pipe 30" maximum pipe length 1 1/2" min Standpipe receptor 1 1/2" min= 2 dfu B18
Bar Sinks, Beer Taps & Coffee Makers Size: the minimum size of indirect waste pipe over 30" in length shall be sized as per Table 82.30-1. If 30" or less in length, the indirect waste piping may the same size as the connection at the fixture or appliance. The minimum size of all local waste piping shall be as per Table 82.30-1 & 82.30-2. Trap: indirect waste piping over 30" in length requires a trap; otherwise, a trap is not required. Local waste piping handling sanitary wastes and longer than 30" requires a trap. Length: some fixtures/appliances (novelty box, ice chest, etc.) have a maximum indirect waste pipe length of 30 inches; otherwise the maximum length of all indirect waste pipe and local waste pipe is 30 feet horizontally and 15 feet vertically. Bar sinks: where possible a bar sink shall be directly connected to the sanitary drainage system. However, if it is not practical to do so, it may discharge to the sanitary system through indirect waste piping by means of an air-gap or air-break. See Comm 82.33 (9) (g) 1. b. Glass fillers Soda Dispensers Beer Taps Coffee makers 4 Compartment Bar Sink Maximum length of indirect 8 ~ ~ waste pipe is 30" when there is no trap installed Air-break Local waste pipe --t---1 1/4" 1 1/2" 1 1/2" 1 1/2" 30 feet maximum horizontally 15 feet maximum vertically Combined 3.5 dfu ~into receptor 'l' 11/4" min-i 3 dfu I 2" Waste sink receptor 2" outlet diameter serving 3.5 dfu 2" trap serving 2" receptor 2" receptor = 3 dfu B 19
Food Service Bar with Four Compartment Bar Sink Wash Rinse Sanitize Drain board Indirect waste piping maximum 30" long if not trapped Air-gap or air-break """ ~-,_11/4" min Standpipe receptor/ min 1 1/2" 1 1/2"@ 1/4" 1 1/2" trap serving 1 1/2" receptor/2 dfu This four compartment bar sink is required when: (1) replacing sinks at existing bars, (2) for all new installations and (3) when pre-packaged food is sold at the bar. The minimum size bar sink compartment shall be able to hold 50% of the largest utensil being used. The first compartment next to the drain board may be used for a hand wash sink. The hand wash sink may also be used for rinsing counter cloths, liquid waste & disposal, provided there is a hands-free faucet with hot & cold water. All new sinks shall meet NSF approval or equivalent. The sink corners must have a smooth "ground weld" to 1/8" minimum radius horizontal and 1/4" radius vertical. Drain board Hand Sink Drain board Drain board 1 1/2" 1 1/2" 3 dfu Standpipe receptor 2" receptor serving 6 dfu 2" trap serving 2" standpipe receptor 2" recptor = 3 dfu A three compartment sink is shown above along with an added single compartment sink. This option may be used in the same manner as the four compartment bar sink shown above. B20
1. Question: 2. Question: 3. Question: 4. Question: 5. Question: 6. Question: 7. Question: 8. Question: 9. Question: Chapter B Questions & Answers May any fixture/appliance utilize indirect or local waste piping? No. Comm 82.32 (5) requires all plumbing fixtures or appliances discharging wastes to connect directly to a drain system. The exception to that rule involves fixtures & appliances having a public health concern, which are required to discharge their wastes by means of an air-gap or air break to a drain system. Refer to Table 82.33-1 for a list of fixtures/appliances that are a public health concern. What is an indirect waste pipe? It is a pipe that connects directly to a fixture or an appliance and does not connect directly to the drainage system. What type of connection is made to the drainage system with an indirect waste pipe? It is either an air-gap or air-break connection depending on the fixture being discharged. How is the minimum size of an indirect waste determined? It is usually determined by the opening or tapping on the fixture or appliance if it is 30" or less. If it is over 30" long, then Table 82.30-1 shall be used to determine the correct size. What are examples of sizes of indirect waste pipes? A 3/8" indirect waste for a coffee brewer or a 2" indirect waste for a dump type dishwasher are some examples. There are various sizes scattered somewhere in between the above sizes but also sizes that may be smaller or larger. What is a local waste? It is a pipe which receives the discharge from indirect waste piping. A local waste does not connect directly to the drainage system but does discharge to the drainage system through an air-break or an air-gap. What type of connection is made between an indirect waste pipe discharging into a local waste pipe? The connection may be an air-gap or an air-break. If the connection between the indirect waste pipe and the local waste pipe is by means of an air-gap, the connection to the drainage system may be by means of an air break or air-gap. What is the maximum length of an indirect waste pipe? The maximum length of an indirect waste pipe which is not trapped is 30" measured both horizontally and vertically. What is the maximum length of an indirect waste pipe which is trapped? The maximum length is 30' horizontally and 15' vertically. B 21
10. Question: 11. Question: 12. Question: 13. Question: 14. Question: 15. Question: 16. Question: 17. Question: Chapter B Questions & Answers Does a pan with a drain outlet installed under a water heater have a drainage fixture unit? How is it connected? A water heater "pan" installed for the purpose of minor leakage from the water heater is not considered a receptor. If the discharge pipe from a T&P valve discharges to the "pan", the drain piping from the "pan" is considered local waste piping and the "pan" is considered a "receptor". The pan would then need to meet all the requirements of an approved receptor (material, etc.), and the minimum size local waste permitted is 1 1/4". For dfu values see question #17. Some bar sinks have a 1" basket strainer. If the indirect waste pipe is 30" or less in developed length, what size must the indirect waste pipe be? Indirect waste piping 30" or less in length is permitted to be the size of the strainer. Some bar sinks have a 1" basket strainer. If the developed length of the indirect waste piping is over 30 inches, the indirect waste piping is required to be 1 1/2" in diameter. Where should the increase from 1" to 1-1/2" be made? The increase from 1" to 1-1/2" should be made immediately under the 1" strainer. Does a drain from a glass washer installed in a bar need to discharge through a grease interceptor? No! A glass washer in a bar does not need to discharge through a grease interceptor provided that greasy dishes are not being washed in the appliance. When are grease interceptors required in a bar which serves food? If the food is served on paper plates or in baskets and the spatula is only used for frying food, a grease interceptor is not required. For fixtures & appliances discharging by means of indirect waste piping, must each compartment be separately trapped? No, compartments of a combination plumbing fixture are permitted to be installed on one trap as long as the requirements of Comm 82.32 (3) (a) are met. What is the difference between a waste sink & a floor sink? In some instances, a waste sink is the same product as a floor sink but simply installed a minimum 1" above the surrounding floor area. How should local waste serving a T&P relief valve be sized? The size receptor chosen dictates the dfu value for sizing local waste piping. Table 82.30-1 identifies a 1 1/4" receptor is 1 dfu, a 1 1/2" receptor is 2 dfu. 822