chapter 7

1 2015 MINNESOTA PLUMBING CODE59 Part I Drainage Drainage Piping. Materials for drainage pipingshall be in accordance with one of the referenced standardsin Table except that:(1) Galvanized wrought-iron and galvanized steel pipeshall not be used underground and shall be kept notless than 6 inches (152 mm) aboveground.(2) ABS and PVC DWV piping installations shall beinstalled in accordance with applicable standards refer-enced in Table (3) No vitrified clay pipe or fittings shall be used above-ground or where pressurized by a pump or shall be kept not less than 12 inches (305 mm)belowground.(4) Copper tube for drainage and vent piping shall have aweight of not less than that of copper drainage tubetype DWV.(5) Stainless steel 304 pipe and fittings shall not beinstalled underground and shall be kept not less than 6inches (152 mm) aboveground.(6) Cast-iron soil pipe and fittings shall be listed and testedin accordance with standards referenced in Such pipe and fittings shall be marked withcountry of origin and identification of the originalmanufacturer in addition to markings required by refer-enced Drainage Fittings.

2 Materials for drainage fittingsshall comply with the applicable standards referenced inTable of the same diameter as the piping served, andsuch fittings shall be compatible with the type of pipe Screwed Pipe. Fittings on screwed pipeshall be of the recessed drainage type. Burred endsshall be reamed to the full bore of the Threads. The threads of drainage fittingsshall be tapped so as to allow 1 4inch per foot ( ) Type. Fittings used for drainage shall be ofthe drainage type, have a smooth interior water-way,and be constructed so as to allow 1 4inch per foot ( ) Lead. (See Table ) Sheet lead shall be notless than the following:(1) For safe pans not less than 4 pounds per square footlb/ft2(19 kg/m2) or 1 16of an inch ( mm) thick.(2) For flashings or vent terminals not less than 3 lb/ft2(15 kg/m2) or of an inch ( mm) thick.(3) Lead bends and lead traps shall be not less than 1 8ofan inch ( mm) wall Caulking ferrules shall bemanufactured from bronze or copper and shall be in accor-dance with Table Soldering Bushings.

3 Soldering bushings shall beof bronze or copper in accordance with Table Fixture Unit Trap unit equivalent of plumbing fixturesshown in Table shall be based on the size of the traprequired, and the unit equivalent of fixtures and devices notshown in Table shall be based on the size of trap ortrap drainage fixture units for a fixture trap andtrap arm loadings for sizes up to 4 inches (100 mm) shall bein accordance with Table (a). Intermittent fixture units for inter-mittent flow into the drainage system shall be computed onthe rated discharge capacity in gallons per minute (gpm)(L/s) in accordance with Table (b). Continuous Flow. For a continuous flow into adrainage system, such as from a pump, sump ejector, airconditioning equipment, or similar device, 2 fixture unitsshall be equal to each gallon per minute (gpm) ( L/s)of Size of Drainage Minimum Size.

4 The minimum sizes of vertical,horizontal, or both drainage piping shall be determinedfrom the total of fixture units connected thereto, and addi-tionally, in the case of vertical drainage pipes, in accor-dance with their SIZE(inches)INSIDEDIAMETER(inches)LENGTH (inches)MINIMUM WEIGHT EACH poundsounces221 441 210331 441 2112441 441 228 TABLE FERRULESFor SI units: 1 inch = 25 mm, 1 pound = kg, 1 ounce = kgPIPESIZE(inches)MINIMUM WEIGHT EACHPIPESIZE(inches)MINIMUM WEIGHT EACH poundsouncespoundsounces11 40621 21611 2083202014438 TABLE BUSHINGSFor SI units: 1 inch = 25 mm, 1 pound = kg, 1 ounce = kgCHAPTER 7 SANITARY DRAINAGE602015 MINNESOTA PLUMBING CODESANITARY DRAINAGEMATERIALUNDERGROUNDDRAIN, WASTE,VENT PIPE ANDFITTINGSABOVEGROUNDDRAIN, WASTE,VENT PIPE ANDFITTINGSBUILDING SEWERPIPE ANDFITTINGSREFERENCEDSTANDARD(S) PIPEREFERENCEDSTANDARD(S)FITTINGSABS (Schedule 40)XXXASTM D 1527,ASTM D 2661,ASTM D 2680*,ASTM F 628 ASTM D 2661,ASTM D 2680*Asbestos-Cement XASTM C 14*,ASTM C 428* Brass X ASTM B 43 Cast-IronXXXASTM A 74,ASTM A 888,CISPI 301 ASME ,ASTM A 74,ASTM A 888,CISPI 301Co-Extruded ABS (Schedule40)XXXASTM F 1488 ASTM D 2661,ASTM D 2680*Co-Extruded PVC (Schedule40)XXXASTM F 891,ASTM F 1488 ASTM D 2665,ASTM F 794*,ASTM F 1866 Copper (Type DWV)

5 XXXASTM B 75,ASTM B 251,ASTM B 302,ASTM B 306 ASME ,ASME Malleable Iron X ASME Steel X ASTM A 53 Polyethylene XASTM F 714 ASTM D 2683,ASTM D 3261,ASTM F 1055,ASTM F 2206 PVC (Schedule 40)XXXASTM D 1785,ASTM D 2665,ASTM F 794*ASTM D 2665,ASTM F 794*,ASTM F 1866 Stainless Steel 304 X ASME Steel 316 LXXXASME Clay (Extrastrength) XASTM C 700 ASTM C 700 TABLE FOR DRAIN, WASTE, VENT PIPE AND FITTINGS* For building sewer MINNESOTA PLUMBING CODESANITARY DRAINAGETABLE FIXTURE UNIT VALUES (DFU)For SI units: 1 inch = 25 mmNotes:1 Indirect waste receptors shall be sized based on the total drainage capacity of the fixtures that drain therein to, in accordance with Table (b).2 Provide a 2 inch (50 mm) minimum refrigerators, coffee urns, water stations, and similar low commercial sinks, dishwashers, and similar moderate or heavy having a clothes-washing area with clothes washers in a battery of three or more clothes washers shall be rated at 6 fixture units each forpurposes of sizing common horizontal and vertical drainage sizes shall not be increased to the point where the fixture discharge is capable of being inadequate to maintain their self-scouring [See Minnesota Rules, chapter 1305, International Building Code].

6 PLUMBING APPLIANCES, APPURTENANCES, OR FIXTURESMINIMUM SIZE TRAPAND TRAP ARM6(inches)PRIVATEPUBLICASSEMBLY7 Bathtub or Combination Bath/Shower11 Bidet11 Bidet11 Clothes Washer, domestic, Unit, cuspidor11 4 , domestic, with independent drain211 Fountain or Water Cooler11 Waste Grinder, commercial2 Drain, emergency2 Drain (for additional sizes see Section ) , single-head , each , single11 , in sets of two or three11 2 Home, Receptor, indirect waste1,311 2 See footnote1,3 Receptor, indirect waste1,42 See footnote1,4 Receptor, indirect waste13 See footnote1 Sinks Bar11 Bar211 2 with food waste211 2 pot or scullery2 Purpose211 Purpose3 , domestic2(with or without food waste grinder, dishwasher, or both) 11 Laundry2(with or without discharge from a clothes washer)11 or Mop Basin2 or Mop Basin3 , flushing rim3 , each set of faucets , integral trap , integral trap greater than , exposed trap211 Closet, GPF Gravity Closet, GPF Flushometer Closet, GPF Flushometer Closet, greater than GPF Gravity Closet, greater than GPF Flushometer Maximum Number of Fixture shows the maximum number of fixture units allowedon a vertical or horizontal drainage pipe, building drain, orbuilding sewer of a given size; the maximum number offixture units allowed on a branch interval of a given size;and the maximum length (in feet and meters) of a verticaldrainage pipe of a given Sizing per Appendix alternate method ofsizing drainage piping, see Appendix C.

7 **Appendix C, Alternate Plumbing Systems, has not been adoptedas part of this code. Alternate Systems shall be approved by theAdministrative Fixture Connections (Drainage). Inlet piping shall be providedwith approved inlet fittings for fixture connections,correctly located according to the size and type of fixtureproposed to be Single Vertical Drainage fixtures setback-to-back, or side-by-side, within the distance allowedbetween a trap and its vent shall be permitted to be servedby a single vertical drainage pipe provided that each fixturewastes separately into an approved double-fixture fittinghaving inlet openings at the same Commercial Dishwashing Machines sinks, scullery sinks, commercial kitchen sinks,beverage service sinks, dishwashing sinks, silverwaresinks, commercial dishwashing machines, silverware-washing machines, and other similar fixtures shall beconnected directly to the drainage system.

8 A floor drainconstructed without backwater valves shall be providedadjacent to the fixture. The fixture shall be connected onthe sewer side of the floor drain trap and no other drainageline shall be connected between the floor drain wasteconnection and the fixture drain. The fixture and floor drainshall be trapped and vented in accordance with this Joints and ABS and ABS Co-Extruded Plastic Pipe methods for ABS plastic pipe and fittingsshall be installed in accordance with the manufacturer sinstallation instructions and shall comply with through Section Mechanical joints shallbe designed to provide a permanent seal and shall be ofthe mechanical or push-on joint. The push-on jointshall include an elastomeric gasket in accordance withASTM D 3212 and shall provide a compressive forceagainst the spigot and socket after assembly to providea permanent Solvent Cement cementjoints for ABS pipe and fittings shall be clean from dirtand moisture.

9 Pipe shall be cut square and shall bedeburred. Where surfaces to be joined are cleaned andfree of dirt, moisture, oil, and other foreign material,solvent cement in accordance with ASTM D 2235 shallbe applied to all joint surfaces. Joints shall be madewhile both the inside socket surface and outsidesurface of pipe are wet with solvent cement. Hold jointin place and undisturbed for 1 minute after Threaded shall complywith ASME A minimum of Schedule 80 shallbe permitted to be threaded. Molded threads on adapterfittings for transition to threaded joints shall bepermitted. Thread sealant compound shall be applied tomale threads, insoluble in water, and nontoxic. Thejoint between the pipe and transition fitting shall be ofthe solvent cement type. Caution shall be used duringassembly to prevent over tightening of the ABScomponents once the thread sealant compound hasbeen Pipe and for asbestos-cement pipe and fittings shall beinstalled in accordance with the manufacturer s installationinstructions and shall comply with Section Mechanical joints shallbe of the same composition as the pipe and sealed withan approved elastomeric gasket or joined by a listedcompression type coupling.

10 Elastomeric gaskets shallcomply with ASTM D 1869. The coupling grooves,pipe ends, and elastomeric gaskets shall be gaskets shall be positioned in the recommended by the manufacturer shall beapplied to the machined end of the pipe. Lubricant shallnot be applied to the elastomeric gasket or groove,unless specifically recommended by the MINNESOTA PLUMBING CODESANITARY DRAINAGEGPMFIXTURE UNITSUp to 71 2 Equals 1 Fixture UnitGreater than 71 2to 15 Equals 2 Fixture UnitsGreater than 15 to 30 Equals 4 Fixture UnitsGreater than 30 to 50 Equals 6 Fixture UnitsTABLE (b)DISCHARGE CAPACITY IN GALLONS PER MINUTEFORINTERMITTENT FLOW ONLY*For SI units: 1 gallon per minute = L/s* Discharge capacity exceeding 50 gallons per minute ( L/s) shall bedetermined by the Authority Having OF TRAP AND TRAP ARM(inches)DRAINAGE FIXTURE UNIT VALUES(DFU)11 41 unit11 23 units24 units36 units48 unitsFor SI Units: 1 inch = 25 mm*Exception.