Sanitary Waste & Vent TS Friday 9:00am 12:00pm Peter Kraut PE

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1 Sanitary Waste & Vent TS Friday 9:00am 12:00pm Peter Kraut PE

2 Waste & Vent Part 1 October 28, :00 10:30 AM

3 Peter A. Kraut, P.E. B.S. Architectural Engineering Technology Wentworth Institute of Technology, Boston Professional Engineer, Mechanical State of California Arizona, Connecticut, Hawaii, Indiana, Maryland, Nevada, New Jersey, New York, North Carolina, Oregon, Pennsylvania, Texas, Virginia, Washington, Wisconsin Over 15 years experience designing plumbing systems South Coast Engineering Group, Inc., 2001

4 Introduction Definitions Materials Engineering Layout Waste Vent

5 Introduction Uniform Plumbing Code International Plumbing Code National Standard Plumbing Code State Plumbing Codes

6 Drawings can be confusing

7 Definitions

8 Cleanout Cleanout Wall cleanout Floor Cleanout Cleanout to grade

9 Cleanout

10 Cleanout Size shall be equal to pipe diameter up to 4 inch. For larger pipe diameters 4 inch cleanouts are adequate Cleanouts shall be provided at the following locations: Upper end of each horizontal branch pipe At intervals not to exceed 100 feet Every change of direction greater than 135 degrees Cleanouts are recommended at the following locations: Every change of direction greater than 90 degrees Base of all stacks Where Building Drain joins Building Sewer

11 Cleanout Cleanouts are not required at the following locations Horizontal drain lines less than 5 feet except those serving sinks and urinals Horizontal pipe installed on a slope of 72 degrees or less from the vertical angle Above the first floor except the building drain and its horizontal branches Where a two way building sewer cleanout can serve as the upper terminal cleanout

12 Fixture Unit (fu) A measure of the probable discharge into the drainage system by various types of plumbing fixtures. Introduced in 1923 by Dr. Roy B. Hunter

13 Trap Tailpiece Vertical pipe from the fixture to the trap Trap Weir Crown Seal Trap Arm Horizontal pipe from the trap to the vent

14 Trap a fitting or device that provides a liquid seal to prevent the emission of sewer gas back through the fixture

15 Trap Horizontal Distance of Trap Arms 1 1¼ ½ and larger ¼ per foot slope 2 includes closet flange to vent

16 Trap Integral Trap Water Closets Siphon Jet Blow Out Wash Out

17 Trap Traps are subject to positive and negative pressures Deeper traps withstand greater pressures Proper trap arm lengths prevent self siphoning

18 Stack Stack Vertical (waste) pipe pp Vent Stack Vertical vent pipe Stack Vent Vent off the top of the waste stack

19 Vent Individual Vent Branch Vent Horizontal One or more fixtures Common Vent More than one

20 Vent Circuit Vent Connects to vent stack Loop Vent Connects to stack vent

21 Vent Island Vent

22 Vent Relief Vent

23 Coordination is key

24 Vent Wet Vent

25 Waste Building Sewer Building Drain Branch

26 Waste Branch of the Building Drain Exterior Wall 2 feet Building Sewer Building Cleanout Building Drain

27 Materials

28 Pipe Hubless Cast-Iron ASTM A 74; CISPI 301

29 Pipe

30 Pipe Copper (Type K,L, or DWV) ASTM B 75; ASTM B 88

31 Pipe (PVC) Polyvinyl Chloride ASTM D 2665; ASTM D 2949

32 Pipe PVC expands and contracts PVC Thermal Expansion and Contraction Change in Length (inches) versus change in Temperature Coefficient of Linear Expansion, e = 2.9 x 10-5 in/in ºF Length (feet) 40ºF 50ºF 60ºF 70ºF 80ºF 90ºF 100ºF

33 Pipe (ABS) Acrylonitrile Butadiene Styrene ASTM D 2661

34 Pipe ABS expands and contracts even more ABS Thermal Expansion and Contraction Change in Length (inches) versus change in Temperature Coefficient of Linear Expansion, e = 5.5 x 10-5 in/in ºF Length (feet) 40ºF 50ºF 60ºF 70ºF 80ºF 90ºF 100ºF `

35 Pipe Allow for expansion with bends, offsets, expansion loops and expansion fittings where necessary Do not strap pipe tight to structural members

36 Pipe It is often less expensive to install all 2 pipe in commercial projects than to carry, install and make transitions to 1½ and 1¼ fittings Not true in residential projects 2½ and 5 cast iron pipe are not commercially available in most locations

37 Fittings Quarter Bend Eight Bend Sixteenth Bend Long Sweep

38 Fittings Bends are named for the number of fittings to make a full circle. Divide into 360 to get the angle. Examples: quarter bend = 360/4 = 90 degrees Sixth bend = 360/6 = 60 degress Use 45 degree and 90 degree bends when laying out waste and vent systems Perpendicular lines are easier to lay out and follow lines of structure

39 Fittings Combination Wye and Eight Bend Double Combination Sanitary Tee Double Quarter Bend

40 Fittings Sanitary Tees can only be used in horizontal to vertical transitions Double Wyes (or Combinations) can only be used in horizontal to vertical transitions

41 Engineering

42 Drainage Gravity accelerates all mass 32 ft/sec 2 DOWN

43 Slope is a dangerous thing

44 Drainage Assumes parallel flow and atmospheric pressure Waste pipe is sized to flow half full Air circulates in the upper half Velocity should be maintained at a minimum of 2 feet per second

45 Drainage The flow of sewage in an open channel is governed by the Manning formula: Where: 149 V = 1.49 R 2/3 h n 2/3 S 1/2 V = velocity in feet per second n = roughness coefficient of the pipe R h = hydraulic radius in feet S = slope in feet/foot

46 Drainage Slope (inches per foot) Values of S and S 1/2 S (feet per foot) S 1/2 1/ / /

47 Drainage The hydraulic radius, R h is equal to the cross sectional area of flow divided by the wetted perimeter. With partially filled pipes, it can be difficult to calculate When half full, it is equal to D/4 When full, it is also equal to D/4

48 Drainage Values of R h, R h 2/3 and A for Half-full Flow Pipe Size R h = D/4 R 2/3 h A (inches) (feet) (square feet) 1 ½ ½

49 Drainage For a 6 cast iron pipe flowing half full at 1% slope the velocity is: V = / /2 = 2.6 For a 6 cast iron pipe flowing full at 1% slope the velocity is the same V = / /2 = 2.6

50 Drainage To calculate flow rate from velocity: Where: q = V A q 449 V A q = flow rate in gallons per minute V = velocity in feet per second A = area of the flow in square feet

51 Drainage A 6 cast iron pipe flowing half full at 2.6 feet per second will convey: q = ( / 2) = A 6 cast iron pipe flowing half full at 2.6 feet per second will convey twice as much

52 Drainage Uniform Flow Velocity and Flow Rate of Drains at ¼ per foot Slope Pipe Size Full or Half Full, V Half Full, q Full, q (inches) (feet per second) (gallons per min.) (gallons per min.) 1 ½ ½

53 Drainage The flow of sewage in a vertical pipe is governed by the stack formula: Q = 27.8 r 5/3 d 8/3 Where: Q = flow rate in gallons per minute r = area ratio of water to stack d = diameter in inches 7 / ths 24 full

54

55 Engineering Terminal Velocity is approximately feet per second and occurs at a terminal length of feet beyond the point of entry into the stack.

56 Engineering

57 Engineering Hydraulic Jump Suds Pressure Zones

58 Engineering trap

59 Layout

60 Layout Considerations Installation Cost Maintenance Finished Appearance

61 Installation Cost Layout at 90 degrees to structure for easy field reference and even hanger spacing When turning odd angles, roll in from the top at 45 degrees Elevation loss Swing joints (2 elbows) require a cleanout Piping from smaller loads towards larger loads will keep pipe sizes to a minimum i Minimize pipe slope

62 Maintenance Maximize pipe slope Faster velocities Do NOT oversize pipe Slower velocities Provide cleanouts everywhere In back-of of-house areas Locate cleanouts above urinals

63 Finished Appearance Locate cleanouts below urinals Careful with ADA Indicate all necessary access panels, cleanouts, etc. Group trap primers with water hammer arrestors and valves Coordinate pipe chases

64 Layout

65 Layout

66 Layout

67 Layout Check wall dimensions Avoid shear walls Look for signs of beams above and below

68 Layout Avoid venting across beams 24 max tailpiece Beam penetrations may be allowed in the middle 1/3 of the structural member Check with Structural Engineer

69 Layout Avoid Wall and Column Footings Follow Codes Check with structural engineer Sleeve Footings where necessary

70 Layout

71 Check what s below

72 Layout Grease waste ¼ per foot slope Grease producing fixtures only Heat trace if necessary Provide additional cleanouts

73 Layout National Electric Code Stay out of the electric room! Avoid passing over any equipment where leakage may cause damage

74 National Electric Code Depth of Working Space. The depth of the working space in the direction of access to live parts shall not be less than indicated. Distances shall be measured from the live parts if such are exposed or from the enclosure front or opening if such are enclosed.

75 National Electric Code Width of Working Space. The width of the working space in front of the electric equipment shall be the width of the equipment or 30 in. (762 mm), whichever is greater. In all cases, the work space shall permit at least a 90 degree opening of equipment doors or hinged panels.

76 National Electric Code Height of Working Space. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 ½ ft (1.98 m). Where the electrical equipment exceeds 6½ ft (1.98 m) in height, the minimum headroom shall not be less than the height of the equipment.

77 National Electric Code The space equal to the width and depth of the equipment and extending from the floor to a height ht of f6ft(183 ft (1.83 m) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. No piping, ducts, or equipment foreign to the electrical installation shall be located in this zone.

78 National Electric Code

79 Damn electrical engineers!

80 Waste Drainage Fixture Unit Values Fixture Min. Branch Private Public Assembly Bathtub 1 ½ ClothesWasher Dishwasher 1 ½ DrinkingFountain 1¼ Floor Drain Shower Kitchen Sink 1 ½ Mop Sink Urinal Water Closet

81 Waste Maximum Loading and Length of Waste Piping Pipe Size (inches) 1 ¼ 1 ½ 2 2 ½ Fixture Units - ¼ per foot slope /8 per foot slope n/a n/a n/a n/a n/a vertical Length (feet) - horizontal unlimited - vertical except sinks, urinals, dishwashers 2 except water closets 3 maximum 3 water closets 4 maximum 4 water closets

82 Waste Discharge Capacity (for intermittent flow) Flow Rate (gallons per min) Load (fixture units) Up to 7 ½ Maximum Trap Loading Pipe Size Loading (inches) (fixture units) ¼ 1 For continuous flow, allow 2 fixture units for each gallon per minute 1 ½

83

84

85 Vent

86 Vent Sized based on load in fixture units and total developed length Distance from the vent connection at the waste system to the open air

87 Vent Maximum Loading and Length of Vent Piping Pipe Size (inches) 1 ¼ 1 ½ 2 2 ½ Fixture Units Length (feet) total horizontal Fixture Units (unlimited length) n/a

88 Vent Vents must rise vertically a minimum of 6 inches above flood level rim of fixture before they turn horizontal Flat vent Vent pipes slope back to fixtures Terminate through roof 10 feet minimum from air intakes

89 Vent Vents shall be at least one-half the diameter of the drain served Vent shall not be less than 1¼ inches in diameter (IPC) Every Building shall have a main vent sized not less than half the building drain and not less than 2 inches (UPC) The total cross sectional area of all vents shall be equal to or greater than the total cross sectional area of the building sewer

90 Vent Assuming 200 fixture units, the building sewer is 6 Ø sq.in. (3) 3 Ø vents might work for fixture units, but (3) 3 Ø sq.in. Separate some fixtures to a fourth 3 Ø vent or Increase two vents to 4

91

92

93 Waste & Vent, Part 1

94 Bibliography Alfred Steele, P.E., Advanced d Plumbing Technology, Construction Industry Press, Elmhurst, IL 1984 Alfred Steele, P.E., Engineered Plumbing Design, Second edition, Construction Industry Press, Elmhurst, IL, 1982 American Society of Plumbing Engineers, Sanitary Drainage And Vent Piping Systems, Chicago, IL, 2006 Cast Iron Soil Pipe Institute, Cast Iron Soil Pipe & Fittings Specifier s Guide, Chattanooga, TN International Association of Plumbing and Mechanical Officials, Uniform Plumbing Code Illustrated Training Manual, Walnut, CA, 1997 International Association of Plumbing and Mechanical Officials, 2006 Uniform Plumbing Code, Ontario, CA 2006 International Code Council Inc., 2006 International Plumbing Code, Country Club Hills, IL, 2006 National Fire Protection Association, National Electrical Code, Quincy, MA, 2001

95 Questions

96 Waste & Vent Part 2 October 28, :45 12:1512:15 AM

97 Introduction Indirect Waste Combination Waste and Vent Wet Venting Alternative Venting Backwater Valves Interceptors Septic Systems Sewage Ejectors

98 Indirect Waste

99 Indirect Waste A waste pipe that does not connect directly with the drainage system, but that discharges into the drainage system through an air break or air gap into a trap, fixture, receptor or interceptor

100 Indirect Waste Minimum 1, except refrigeration coils and ice machines Minimum Condensate Pipe Size Equipment Capacity (tons) Minimum Diameter (inches) Up to 20 ¾ ¼ ½ Ice machines ¾ Food equipment drains ½

101 Indirect Waste Maximum length 15 Or, trapped but not necessarily vented Bar sinks 5 Food handling fixtures may not be combined Cleanouts

102 Air Break A physical separation which may be a low inlet into the indirect waste receptor from the fixture, appliance, or device indirectly connected

103 Air Gap The unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe, plumbing fixture, appliance, or appurtenance conveying waste to the flood-level level rim of the receptor

104 Indirect Waste Receptors Readily accessible (no access panel) No toilet room, closet, cupboard or storeroom Condensate to a sink or lavatory tailpiece must discharge in the area controlled by the same person controlling the air conditioning unit

105 Access is important

106 Combination Waste and Vent

107 Comb Waste and Vent Only where structural conditions prevent conventional venting Must be approved by AHJ No water closets or urinals Additional vent required for branches longer than 15

108 Comb Waste and Vent Waste pipes two (2) pipe sizes larger than code 2 2 ½ No vertical pipe except tailpieces 24 maximum tailpieces 45 degree vertical offsets allowed in branch piping, only

109 Comb Waste and Vent

110 Wet Venting

111 Wet Venting A vent that vents a particular fixture and at the same time serves as a waste to receive the discharge from other fixtures Fixtures must be located on the same floor Examples: high low drinking fountains, bathroom groups, lavatory to water closet Check local codes

112 Wet Venting

113 Wet Venting

114 Alternative Venting

115 Alternative Venting Air Admittance Valve Prevents self- siphoning Individual fixtures Air flows in not out

116 Alternative Venting Aerator Disrupts stack action

117 Backwater Valves

118 Backwater Valves A device or valve installed in the building drain or sewer pipe where a sewer is subject to backflow, and which prevents drainage or waste from backing into a low level or fixtures and causing a flooding condition. Required for fixtures below the next upstream manhole Not allowed on fixtures above the next upstream manhole

119 Backwater Valves

120 Backwater Valves

121 It looked good in plan view

122 Interceptors

123 Interceptors A device designed and installed to separate and retain for removal, by automatic or manual means, deleterious, hazardous or undesirable matter from normal wastes, while permitting normal sewage or wastes to discharge into the drainage system by gravity, but that discharges into the drainage system through an air break or air gap into a trap, fixture, receptor or interceptor Grease Oil Solids Lint

124 Interceptors

125 Interceptors Drainage Fixture Units Grease Interceptor Sizing , , , , , , , , ,500 Interceptor Volume (gallons)

126 Interceptors Drainage Fixture Units Hydromechanical Grease Interceptor (HGI) Sizing Interceptor Volume (gallons)

127 Septic Systems

128 Septic systems Estimated Sewage Flows Churches 5 gpd per seat Hospitals 250 gpd per bed Hotels (excludes kitchen) 60 gpd per (2 person) bed Offices (schools, stores, etc.) 20 gpd per employee Restaurants 6 gpd per meal - toilet 7 gpd per customer School, Elementary 15 gpd per student School, Intermediate and High 28 gpd per student Service Station, 1 bay gpd each additional bay Store 1 gpd per 10 square feet Theater 5 gpd per seat

129 Septic systems Single Family 1 (bedrooms) Capacity of Septic Tanks Multi-Family 2 (1 bedroom units) Other 3 (fixture units) , , ,500 1 Each additional bedroom, add 150 gallons 2 Each additional unit, add 250 gallons 3 Each additional fixture unit, add 25 gallons , , ,500

130 Septic systems Leach Field Dimensions Minimum Maximum Leach 100 ft Lines Width 18 in 36 in Spacing 6 ft Depth 12 in Grade Level 3 in /100 ft Filler 12 in Under Filler Over 2 in Square Feet of Leaching Area / 100 gal Septic Maximum Septic Tank Size (gallons)

131 Septic systems

132 Septic systems

133 Septic systems Design Criteria of Five Typical Soils Type of Soil Square Feet of Leaching Area / 100 gal Maximum absorption (gal /sf /24 hr) Septic Coarse Sand or Gravel Fine Sand Sandy Loam or Sandy Clay Clay with Considerable Sand or Gravel Clay with Little Sand or Gravel

134 Septic systems Location of Sewage Disposal System Distance from Sewer Septic Tank Leach Field Seepage Pit Structure 2 ft 5 ft 8 ft 8 ft Property Line Clear 5 ft 5 ft 8ft Water Well 50 ft 50 ft 100 ft 150 ft Stream 50 ft 50 ft 100 ft 150 ft Tree 10 ft 10 ft Seepage Pit 5 ft 5 ft 12 ft Leach Field 5 ft 4 ft 5 ft Water Pipe 1 ft 5 ft 5 ft 5 ft Distribution Box 5 ft 5 ft Public Water Pipe 10 ft 10 ft 10 ft 10 ft

135 Sewage Ejectors

136 Sewage Ejectors A device (pump) for lifting sewage automatically up into the gravity drainage system Simplex Duplex 100% / 100% Required for commercial installations 50% / 50% Some protection during pump failure

137 Sewage Ejectors Fiberglass Basins Anti-Floatation flange keeps basin from floating when the groundwater rises Concrete Pits Reinforcement holds back weight of earth on side walls

138 Sewage Ejectors How many things can go wrong with one installation? ti

139 Sewage Ejectors Trash cans are not an approved material Pits must be water proof Ejector pits must be located away from foundation loads

140 Sewage Ejectors Conduits must be sealed The inlet must be higher than the working volume The pump stop must be high enough to keep the pump wet Discharge pipes require shut off valves and check valves

141 Sewage Ejectors Duplex pumps must share the same volume of water Pump basins should be sized for 3 minute run time Basin must be vented

142 Sewage Ejectors Flow rate of pump = peak flow rate of sewage coming in Multiply fixture units by 0.5 to get gallons per minute or Convert fixture units to gallons per minute using Hunter s Curve

143 Sewage Ejectors Head is a measure of resistance 1 psi = 2.31 feet of head Pump head = suction head + friction head + lift Suction head = 0 for submersible pumps Friction head = resistance in pipe + resistance in fitting Lift = elevation change from the bottom of the basin to the discharge

144 Sewage Ejectors Total Developed Length = Pipe length + Equivalent fitting length (depends on pipe material) Diameter of fitting (in) 45 bend (ft) 90 bend (ft) Gate valve (ft) check valve (ft)

145 Sewage Ejectors Example 60 of 3 straight pp pipe (3) 3 45 bends (2) 3 90 bends (1) 3 gate valve (1) 3 check valve x(6) + 2x(10) = 116 feet, equivalent length

146 Sewage Ejectors Example 250 GPM in a 3 pipe Friction = 6.5 psi per 100 feet of pipe 6.5 x 116 / 100 = 7.54 psi Convert psi to feet = 7.54 x 2.31 ft/psi = 17.4 feet Note: 10 ft/sec

147 Sewage Ejectors Pump head = suction head + friction head + lift Example Elevation of discharge = 167 Elevation of sump cover = 148 Depth of basin 8 (assumed) Lift = = 27 feet

148 Sewage Ejectors Pump Head = 0, suction head 17.4, friction head 27, lift 44.4 total head 250 gpm at head is difficult to find Use duplex pumps (50% / 50%) at 125 gpm each

149 Sewage Ejectors

150 Sewage Ejectors Pump curves represent the performance When the operating point does not fall on the curve Trim the impeller Actual operating point 125 gpm 44.4 ft head 2.8 HP 58% efficient

151 Sewage Ejectors

152 Sewage Ejectors Extend the system curve Actual operating point gpm Changes may affect basin sizing ft head Changes may affect pipe material HP 2.9 Changes may affect motor selection 58% efficient Changes may affect economics of operation

153 Sewage Ejectors

154 Sewage Ejectors Submersible H x = pump stop, see manufacturer H min = working volume: Q in gpm x 60 / number of starts per hour (typically Q x 3, see manufacturer) H lag = 2nd pump delay: typically 2 in, see manufacturer H res = reserve: typically 2 Vent must be above inlet

155 Sewage Ejectors Basins and Pits Duplex pumps p need 3 diameter minimum Fiberglass basins are usually round Concrete pits are usually square Working volume, V min V min = 60 / pump starts per hr. x flow rate V min = 60 / 20 x 125 V min = 375 gallons

156 Sewage Ejectors Working depth, H min 36 x 36 pit 375 gallons x ft 3 /gal = 50 ft 3 50 ft 3 / 9 ft 2 = ft deep working volume Pump stop, H x = 4 = Pump lag, H lag =2 = Pump res, H res = 2 = Invert = 18 = 1.5 Basin Depth = ft deep

157 Sewage Ejectors Each pump requires independent Check Valve Gate Valve, check local codes for ball valves Locate valves outside of pits Valve box Wall mounted Backwater valves may be required when combining fixtures at different elevations

158 Sewage Ejectors Check Flow rate - basin size Cover traffic rating Pit vent per local codes Pressure pipe material Velocity pipe material Discharge effect on sewer

159 Core drill carefully

160 Bibliography Alfred Steele, P.E., Advanced d Plumbing Technology, Construction ti Industry Press, Elmhurst, IL 1984 Alfred Steele, P.E., Engineered Plumbing Design, Second edition, Construction Industry Press, Elmhurst, IL, 1982 American Society of Plumbing Engineers, Sanitary Drainage And Vent Piping Systems, Chicago, IL, 2006 Cast Iron Soil Pipe Institute, Cast Iron Soil Pipe & Fittings Specifier s Guide, Chattanooga, TN International Association of Plumbing and Mechanical Officials, Uniform Plumbing Code Illustrated t Training i Manual, Walnut, CA, 1997 International Association of Plumbing and Mechanical Officials, 2006 Uniform Plumbing Code, Ontario, CA 2006 International Code Council Inc., 2006 International Plumbing Code, Country Club Hills, IL, 2006 Submersible Wastewater Pump Association, Submersible Sewage Pumping Systems (SWPA) Handbook, Second Edition, Glenview, IL, 1997

161 Questions

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