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SPS 382.31(5)(a)(a) Vents serving offsets of 30 to 45° in drain stacks.
SPS 382.31(5)(a)1.1. Except as permitted in subd. 2., where a horizontal branch connects to a drain stack within 2 feet above or below an offset with a change of direction of 30 to 45° from the vertical and the offset is located below 5 or more branch intervals, the offset shall be vented in accordance with par. (b) 1. to 3.
SPS 382.31(5)(a)2. 2. Where the drain stack and offset are sized as building drain as per Table 382.30–3, the vents serving the offset of 30 to 45° in a drain stack are not required.
SPS 382.31(5)(b) (b) Vents serving offsets of more than 45o in drain stacks. Offsets of more than 45o in drain stacks shall be vented where 5 or more branch intervals are located above the offset. The offset shall be vented by venting the upper and lower section of the stack.
SPS 382.31(5)(b)1. 1. `Upper section.' The upper section of the stack shall be vented as a separate stack with a vent stack connection installed in accordance with sub. (4). The offset shall be considered the base of the stack.
SPS 382.31(5)(b)2. 2. `Vent connection above offset.' The vent stack shall connect with a wye pattern fitting above the stack offset and at or below the lowest drain branch above the offset.
SPS 382.31(5)(b)3. 3. `Lower section.' The lower section of the stack shall be vented by a yoke vent connecting below the offset above or at the next lower horizontal branch.
SPS 382.31(5)(b)3.a. a. Except as provided in subd. 3. b., the connection of the yoke vent to the drain stack shall be by means of a wye pattern fitting.
SPS 382.31(5)(b)3.b. b. The yoke vent connection may be a vertical extension of the stack.
SPS 382.31(5)(b)3.c. c. The connection of the yoke vent to another vent shall not be less than 38 inches above the next higher floor level where plumbing fixtures are installed that discharge into the drain stack.
SPS 382.31(6) (6)Relief vents for stacks of more than 10 branch intervals.
SPS 382.31(6)(a)(a) Drain stacks of more than 10 branch intervals shall be provided with a relief vent at each tenth interval installed.
SPS 382.31(6)(b) (b) The lower end of the relief vent required in par. (a) shall connect to the stack by use of a wye pattern fitting below the horizontal branch serving that floor.
SPS 382.31(6)(c) (c) The upper end of the relief vent required in par. (a) shall connect to the vent stack not less than 38 inches above the next higher floor level where plumbing fixtures are installed that discharge into the drain stack.
SPS 382.31(7) (7)Relief vents for building drains. A building drain with a change in elevation of 12 feet or more and at an angle of 45° or more from the horizontal shall be provided with a relief vent.
SPS 382.31(7)(a) (a) The connection of the relief vent to the building drain shall be by means of a wye pattern fitting installed within 2 feet upstream of the top of the change in elevation.
SPS 382.31(7)(b) (b) The connection of the relief vent to another vent shall be not less than 38" above the next higher floor level where plumbing fixtures are installed that discharge through the building drain.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(8) (8)Vents for sanitary sumps.
SPS 382.31(8)(a)(a) Interior sanitary sumps. Sanitary sumps shall be provided with a vent connecting either to the sump above the drain inlet or to the drain inlet within 12" of the sump.
SPS 382.31(8)(b) (b) Exterior sanitary sumps. Sanitary sumps shall be provided with a vent that terminates in accordance with sub. (16) (h).
SPS 382.31(9) (9)Fixture vents.
SPS 382.31(9)(a)(a) Developed length between vent and trap. Each fixture trap shall be protected with a vent located in accordance with the provisions of subds. 1. and 2.
SPS 382.31(9)(a)1. 1. Each fixture trap which is not an integral part of the fixture shall be protected with a vent so located that the developed length of the fixture drain piping from the trap weir to the vent connection is within the limits set forth in Table 382.31-1.
SPS 382.31(9)(a)2. 2. Each fixture trap which is an integral part of the fixture shall be protected with a vent so located that the developed length of the fixture drain piping from fixture outlet to the vent connection is within the limits set forth in Table 382.31-1. For a floor outlet water closet or similar fixture, the point where the fixture drain piping turns horizontal shall be considered as the fixture outlet.
SPS 382.31(9)(b) (b) Minimum distance. A vent shall not connect to a fixture drain within the distance equal to 2 diameters of the drain piping from the weir of a trap.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material. - See PDF for table PDF
SPS 382.31(10) (10)Circuit venting. In lieu of providing individual vents, a horizontal drain to which at least 2 but not more than 8 wall outlet fixtures or at least 2 but not more than 8 floor outlet fixtures, other than blowout type fixtures and wall-outlet carrier type water closets, are connected to the same horizontal branch drain, may be vented by a circuit vent in accordance with pars. (a) to (e).
SPS 382.31(10)(a) (a) The circuit vent shall connect to the horizontal drain at a point between the 2 most upstream fixtures.
SPS 382.31(10)(b)1.1. A circuit vented horizontal drain into which 4 or more fixtures discharge shall be provided with a relief vent. The relief vent shall connect to the circuit vented horizontal drain downstream of the most downstream fixture drain which is vented by the circuit vent and upstream of any other drain connections.
SPS 382.31(10)(b)2. 2. Two circuit vented horizontal drains serving a total of 8 fixtures, 4 on each branch, shall be provided with at least one relief vent, unless the horizontal drains connect to a drain stack with no other drain connections located above the circuit vented horizontal drains. One relief vent may serve both horizontal drains, if installed downstream of the point where the 2 horizontal drains are joined.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(10)(c) (c) A horizontal drain served by a circuit vent may not diminish in size from the most downstream fixture drain connection vented by the circuit vented drain to the circuit vent connection. Where a relief vent is installed, the horizontal drain served by the circuit vent shall not diminish in size from the relief vent connection to the circuit vent connection.
SPS 382.31(10)(d) (d) Fixture drains served by a circuit vent shall conform to the provisions of sub. (9). The connection of the fixture drain to the branch drain served by the circuit vent shall be considered as the vent connection.
SPS 382.31(10)(e) (e) Additional wall outlet fixtures with a drainage fixture unit value of one or less which are served by individual vents or common vents may discharge into a horizontal drain served by a circuit vent.
SPS 382.31(11) (11)Common vents. In lieu of providing individual vents, fixtures may be common vented in accordance with pars. (a) and (b).
SPS 382.31(11)(a) (a) Vertical drains. A common vent may serve a maximum of 2 fixtures where both fixture drains connect to a vertical drain at the same elevation. Where this connection is by means of a sanitary tee fitting with a side inlet, the centerline of the side inlet opening may not be below the centerline of the larger opening. The drain connection of a blowout type fixture or a kitchen sink served by a common vent may not be by means of a double sanitary tee fitting.
SPS 382.31(11)(b) (b) Horizontal branches. The fixture drains from 2 wall-outlet fixtures, each with a drainage fixture unit value of one or less, or the fixture drains from 2 traps serving a kitchen sink with or without a dishwasher may connect to a horizontal branch without individual vents provided a common vent connects to the branch drain downstream of both fixture drains. Both fixture drains shall be of the same diameter. The developed length of the drain from the vent to the farthest trap shall conform to sub. (9).
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(12) (12)Return vents. Plumbing fixtures may be vented in accordance with pars. (a) to (d).
SPS 382.31(12)(a) (a) Wall outlet fixtures may be vented by extending an individual vent, vertical wet vent or a common vent as high as possible under the fixture enclosure and returning the vent vertically downward and connecting the vent to the fixture drain or branch drain by means of a wye pattern fitting.
SPS 382.31(12)(b) (b) Horizontal vent piping shall connect to the vertical section of the fixture vent and extend to a point where it can extend vertically to a vent terminal in accordance with sub. (16) or connect to another vent in accordance with sub. (15).
SPS 382.31(12)(c) (c) Drainage fittings shall be used on all sections of the vent pipe below the floor level and a minimum slope of 14" per foot to the drainage point shall be provided.
SPS 382.31(12)(d) (d) Cleanouts shall be provided on the vent piping in accordance with s. SPS 382.35.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(13) (13)Wet venting. In lieu of providing individual vents, fixtures may be wet vented in accordance with pars. (a) to (c).
SPS 382.31(13)(a) (a) Vertical wet vents.
SPS 382.31(13)(a)1.1. Where 2 wall outlet fixtures are located on the same floor level with their fixture drains connecting to the same vertical drain pipe at different elevations, the lower fixture drain may be wet vented in accordance with subd. 1. a. to e.
SPS 382.31(13)(a)1.a. a. No other fixtures may discharge into the vertical drain pipe above or between the 2 wall outlet fixtures. Additional fixtures may discharge into the vertical drain pipe below the 2 wall outlet fixtures.
SPS 382.31(13)(a)1.b. b. A branch vent shall connect to the vertical drain pipe immediately above the higher fixture drain connection.
SPS 382.31(13)(a)1.c. c. The drain between the 2 fixtures shall be at least one pipe size larger than the upper fixture drain, but not smaller than 2" in diameter.
SPS 382.31(13)(a)1.d. d. Both fixture drains shall conform to sub. (9). The connection of the lower fixture drain to the vertical drain shall be considered as the vent connection.
SPS 382.31(13)(a)1.e. e. The higher fixture drain may not serve a water closet.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(13)(b) (b) Horizontal wet vents. A drain from a lavatory or lavatories which are either provided with individual vents or a common vent may serve as the wet vent for not more than 2 bathtubs or showers and not more than 2 water closets in accordance with subds. 1. to 7. No other fixtures may discharge into or be served by the wet vent.
SPS 382.31(13)(b)1. 1. All of the fixtures shall be located in nonpublic bathroom groups.
SPS 382.31(13)(b)2. 2. The lavatories and bathtubs or showers shall have a common horizontal drain with the drain for the lavatories serving as a wet vent for the bathtubs or showers.
SPS 382.31(13)(b)3. 3. Where 2 bathtubs or showers are served by the same wet vent, their fixture drains shall connect independently to the common horizontal drain downstream of the vertical drain serving the lavatory or lavatories.
SPS 382.31(13)(b)4. 4. Where 2 bathtubs or showers and 2 water closets are served by the same wet vent a relief vent shall be provided, unless the wet vented horizontal drain connects to a drain stack with no other drain connections located above the wet-vented horizontal drain. The relief vent shall connect to the horizontal drain at a point downstream of the fixture drains for the water closets and upstream of any other fixture drain connections.
SPS 382.31(13)(b)5. 5. One or 2 water closets may connect to the common horizontal drain with the drain from the lavatories and bathtubs or showers also serving as a wet vent for the water closets. Where 2 water closets are served by the same wet vent, their fixture drains shall connect independently to the common horizontal drain at the same point.
SPS 382.31(13)(b)6. 6. The wet vent shall be at least 2" in diameter. No more than 4 drainage fixture units may discharge into a 2" diameter wet vent.
SPS 382.31(13)(b)7. 7. A branch vent shall connect immediately above the highest fixture drain connection and shall be sized in accordance with sub. (14).
SPS 382.31(13)(c) (c) Other types of wet vents. An individual vent serving a floor outlet fixture, a common vent serving floor outlet fixtures, a circuit vent, a relief vent serving a circuit vented drain or a relief vent serving a wet vented horizontal drain may serve as a wet vent in accordance with subds. 1. to 4.
SPS 382.31(13)(c)1. 1. No more than 2 wall outlet fixtures, each fixture with a drainage fixture unit value of one or less, may have their fixture drains connected into the individual vent, common vent, circuit vent or relief vent.
SPS 382.31(13)(c)2. 2. The wet vent shall be at least 2" in diameter.
SPS 382.31(13)(c)3. 3. The branch vent to which the wet vent connects shall be sized in accordance with sub. (14). The branch vent may serve the wall outlet fixtures in lieu of individual vents or a common vent.
SPS 382.31(13)(c)4. 4. The fixtures discharging into the wet vent shall be located on the same floor level as the fixtures served by the wet vent.
SPS 382.31 Note Note: For explanatory material refer to ch. SPS 382 Appendix A-382.31 (13).
SPS 382.31(14) (14)Vent size.
SPS 382.31(14)(a)(a) Stack vents and vent stacks. Stack vent and vent stack pipe sizes shall be determined in accordance with Table 382.31-2 on the basis of developed length and the diameter of the drain stack at its base.
SPS 382.31(14)(a)1. 1. The developed length of the stack vent shall be measured along the vent pipe, from the highest drain branch connection to the vent terminal or to the connection to a vent header.
SPS 382.31(14)(a)2. 2. The developed length of the vent stack shall be measured along the vent pipe from the vent stack base connection to the vent terminal or to the connection to a vent header.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(b) (b) Vent headers.
SPS 382.31(14)(b)1.1. Vent header pipe sizes shall be determined in accordance with Table 382.31-3 with the number of drainage fixture units being the sum of the fixture unit loads of the stacks vented through that portion of the header. The diameter of a vent header shall not be less than any vent connecting to it.
SPS 382.31(14)(b)2. 2. The developed length of the vent header shall be measured along the pipe from the most distant vent stack or stack vent base connection to the vent terminal.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(c) (c) Branch vents. Branch vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the branch vent shall be measured along the pipe from the furthest fixture drain served by the branch vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(d) (d) Individual vents. Individual vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of an individual vent shall be measured along the vent pipe from the fixture drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(e) (e) Common vents. Common vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of a common vent shall be measured along the vent pipe from the drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to the vent terminal. - See PDF for table PDF - See PDF for table PDF
SPS 382.31(14)(f) (f) Circuit vents. Circuit vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the circuit vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31(14)(g) (g) Relief vents. Relief vents shall be sized in accordance with the provisions of subds. 1. to 3. The developed length of a relief vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31(14)(g)1. 1. `Circuit vented branch drain.' The diameter of a relief vent for a branch drain served by a circuit vent shall be at least one half the diameter of the branch drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(g)2. 2. `Building drain.' The diameter of a relief vent serving a building drain, as required in sub. (7), shall be at least one half the diameter of the building drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(g)3. 3. `Horizontal wet vent.' The diameter of a relief vent serving a horizontal wet vent shall be at least 11 2". The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(h) (h) Yoke vents. A yoke vent serving a drain stack shall be sized as a vent stack in accordance with par. (a).
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.