You are viewing an archived code
Loading...
A hair and lint catcher or strainer shall be installed on the suction side of the circulation pump to prevent hair, lint and other extraneous material from reaching the pump filters. Hair and lint catchers shall be so designed that they can be easily dismantled for cleaning and inspection and shall be so located as to be easily accessible for cleaning. The design features shall be as follows: Water passes through the strainer from the outside; the strainer is made of non-corrosive material; the width or diameter of the miner openings is not more than 1/8 inch (3 mm); the area of the strainer openings shall be at least five times the cross sectional area of the inlet pipe to the strainer.
Recirculating systems shall contain rapid pressure filters. Sufficient filter area shall be provided to filter the entire contents of the pool in six hours at the rate of not more than 3 gallons per square foot (11.4 L/.09 m
2
) filter area per minute. The filter backwashing facilities shall be sufficient to backwash at the rate of 15 gallons per minute (12.5 L/0.09 m
2
) filter area. All backwash water and effluents shall be discharged to the sewer through an indirect connection. Pressure filters shall be equipped with readily accessible air relief valves, loss of head or pressure gauges on the inlet and outlet pipes, and an access head or hole large enough to permit inspection, maintenance and repair work. Sight glasses that can be easily removed for cleaning shall be provided in the effluent line from the filter units.
Equipment shall be provided for the disinfection of all pool water. Any disinfection method using materials other than chlorine compounds shall be subject to the approval of the board of health. Disinfection equipment installed for the use of chlorine compounds shall have sufficient capacity to maintain a minimum free chlorine residual of 0.5 parts per million. The disinfectant shall be introduced into the recirculation system ahead of the filters.
All electrical installations provided for, installed and used in conjunction with private residential swimming pools shall be in conformance with Title 14E.
(Amend Coun. J. 9-6-17, p. 55278, Art. II, § 65)
Article 13. Referenced Standards
NOTE: Add the prefix 18-29- to all cited sections and tables
This article lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section 18-29-102.8.
ANSI | American National Standards Institute 11 West 42nd Street New York, NY 10036 | |
Standard Reference Number | Title | Referenced in code section number |
Z21.22-86 | Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems – with 1990 Addendum | |
Z124.1-95 | Plastic Bathtub Units | |
Z124.2-95 | Plastic Shower Receptors and Shower Stalls | |
Z124.3-95 | Plastic Lavatories | |
Z124.4-86 | Plastic Water Closet Bowls and Tanks | |
Z124.6-90 | Plastic Sinks | |
Z358.1-98 | Emergency Eyewash and Shower Equipment | |
ARI | Air-Conditioning & Refrigeration Institute 4301 N. Fairfax Drive, Suite 425 Arlington, VA 22203 | |
Standard Reference Number | Title | Referenced in code section number |
1010-94 | Self-Contained, Mechanically-Refrigerated Drinking-Water Coolers |
ASME | American Society of Mechanical Engineers 345 East 47th Street New York, NY 10017 | |
Standard Reference Number | Title | Referenced in code section number |
A13.1-81 | Scheme for the Identification of Piping Systems | |
A112.1.2-91 | Air Gaps in Plumbing Systems | Table 608.1 |
A112.6.1-88 | Supports for Off-the-Floor Plumbing Fixtures for Public Use | |
A112.14.1-75 | Backwater Valves | |
A112.18.1M-94 | Brass Plumbing Fixture Units – with 1995 Errata | |
A112.19.1M-94 | Enameled Cast Iron Plumbing Fixtures | |
A112.19.2-95 | Vitreous China Plumbing Fixtures – with 1996 Errata | |
A112.19.3-87 | Stainless Steel Plumbing Fixtures (Designed for Residential Use) | |
A112.19.4M-94 | Porcelain Enameled Formed Steel Plumbing Fixtures | |
A112.19.5-79 | Trim for Water-Closet Bowls, Tanks, and Urinals | |
A112.19.6-95 | Hydraulic Performance Requirements for Water Closets and Urinals | |
A112.19.7-95 | Whirlpool Bathtub Appliances | |
A112.19.8-87 | Suction Fittings for Use in Swimming Pools, Wading Pools, Spas, Hot Tubs, and Whirlpool Bathtub Appliances | |
A112.19.9-91 | Non-Vitreous Ceramic Plumbing Fixtures | |
A112.21.1-91 | Floor Drains | |
A112.21.2-91 | Roof Drains | |
B1.20.1-83 | Pipe Threads, General Purpose (inch) | |
B16.3-92 | Malleable Iron Threaded Fittings | |
B16.4-92 | Cast Iron Threaded Fittings | |
B16.9-93 | Factory-Made Wrought Steel Buttwelding Fittings | |
B16.11-91 | Forged Steel Fittings, Socket-Welding and Threaded | |
B16.12-91 | Cast-Iron Threaded Drainage Fittings | |
B16.15-85 | Cast Bronze Threaded Fittings | |
B16.18-84 | Cast Copper Alloy Solder Joint Pressure Fittings | |
B16.22-95 | Wrought Copper and Copper Alloy Solder Joint Pressure Fittings | |
B16.23-92 | Cast Copper Alloy Solder Joint Drainage Fittings (DWV) – with 1994 Errata | |
B16.26-88 | Cast Copper Alloy Fittings for Flared Copper Tubes | |
B16.28-94 | Wrought Steel Buttwelding Short Radius Elbows and Returns | |
B16.29-94 | Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings – DVW | |
B16.32-92 | Cast Copper Alloy Solder Joint Fittings for Solvent Drainage Systems | |
ASSE | American Society of Sanitary Engineering 28901 Clemens Road Westlake, OH 44145 | |
Standard Reference Number | Title | Referenced in code section number |
1001-90 | Performance Requirements for Pipe Applied Atmospheric Type Vacuum Breakers | |
1002-86 | Performance Requirements for Water Closet Flush Tank Ball Cocks | |
1003-95 | Performance Requirements for Water Pressure Reducing Valves for Domestic Water Supply Systems | |
1004-90 | Performance Requirements for Commercial Dishwashing Machines | |
1005-86 | Performance Requirements for Water Heater Drain Valves – with 1986 Revision | |
1006-89 | Performance Requirements for Residential Use (Household) Dishwashers | |
1007-92 | Performance Requirements for Home Laundry Equipment | |
1008-89 | Performance Requirements for Household Food Waste Disposer Units | |
1009-90 | Performance Requirements for Commercial Food Waste Grinder Units | |
1010-82 | Performance Requirements for Water Hammer Arresters – with 1982 Revision | |
1011-95 | Performance Requirements for Hose Connection Vacuum Breakers | |
1012-95 | Performance Requirements for Backflow Preventers with Intermediate Atmospheric Vent | |
1013-95 | Performance Requirements for Reduced Pressure Principle Backflow Preventers | |
1014-90 | Performance Requirements for Handheld Showers | |
1015-93 | Performance Requirements for Double Check Backflow Prevention Assembly – with 1993 Revision | |
1016-90 | Performance Requirements for Individual Thermostatic, Pressure Balancing and Combination Control Valves for Bathing Facilities | |
1017-90 | Temperature Actuated Mixing Valves for Primary Domestic Use | |
1018-86 | Performance Requirements for Trap Seal Primer Valves. Water Supply Fed – with 1986 Revision | |
1019-95 | Performance Requirements for Wall Hydrants, Freezeless, Automatic Draining, Anti-Backflow Types | |
1020-90 | Performance Requirements for Pressure Vacuum Breaker Assembly | Table 608.1 |
1022-96 | Backflow Preventer for Carbonated Beverage Machines | |
1024-94 | Performance Requirements for Dual Check Valve Type Backflow Preventers (for Residential Supply Service or Individual Outlets) | Table 608.1 |
1025-78 | Performance Requirements for Diverters for Plumbing Faucets with Hose Spray, Anti-Siphon Type, Residential Applications | |
1032-80 | Performance Requirements for Dual Check Valve Type Backflow Preventers; for Carbonated Beverage Dispensers – Post Mix-Types | |
1035-95 | Performance Requirements for Laboratory Faucet Backflow Preventers | |
1037-90 | Performance Requirements for Pressurized Flushing Devices for Plumbing Fixtures | |
1044-86 | Performance Requirements for Trap Seal Primer Valves; Drainage Type | |
1047-95 | Performance Requirements for Reduced Pressure Detector Assembly Backflow Preventers | Table 608.1 |
1048-95 | Performance Requirements for Double Check Detector Assembly Backflow Preventer | |
1052-94 | Performance Requirements for Hose Connection Backflow Preventers | |
1056-93 | Back Siphonage Vacuum Breaker | Table 608.1 |
5010-1013-1-91 | Field Test Procedure for Reduced Pressure Principle Assembly Using a Differential Pressure Gauge | |
5010-1015-1-91 | Field Test Procedure for a Double Check Valve Assembly Using a Duplex | |
5010-1015-2-91 | Field Test Procedure for a Double Check Valve Assembly Using a Differential Pressure Gauge – High- and Low-Pressure Hose Method | |
5010-1015-3-91 | Field Test Procedure for a Double Check Valve Assembly Using a Differential Pressure Gauge – High-Pressure Hose Method – with August 1992 Revisions | |
5010-1015-4-91 | Field Test Procedure for a Double Check Valve Assembly Using a Sight Tube | |
5010-1020-1-91 | Field Test Procedure for a Pressure Vacuum Breaker Assembly | |
5010-1047-1-91 | Field Test Procedure for a Reduced Pressure Detector Assembly Using A Differential Pressure Gauge | |
5010-1048-1-91 | Field Test Procedure for a Double Check Detector Assembly Using a Duplex Gauge | |
5010-1048-2-91 | Field Test Procedure for a Double Check Detector Assembly Using a Differential Pressure Gauge – High- and Low-Pressure Hose Method | |
5010-1048-3-91 | Field Test Procedure for a Double Check Detector Assembly Using a Differential Pressure Gauge – High-Pressure Hose Method | |
5010-1048-4-91 | Field Test Procedure for a Double Check Detector Assembly Using a Sight Tube | |
ASTM | American Society for Testing and Materials 100 Barr Harbor Drive West Conshohocken, PA 19428-2959 | |
Standard Reference Number | Title | Referenced in code section number |
A 53-94 | Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless | |
A 74-94 | Specification for Cast Iron Soil Pipe and Fittings | |
A 377-99 | Standard Index of Specifications for Ductile-Iron Pressure Pipe | |
A 733-89 | Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples | |
A 888-95 | Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste and Vent Piping Application | |
B 32-94 | Specification for Solder Metal | |
B 42-93 | Specification for Seamless Copper Pipe, Standard Sizes | |
B 43-94 | Specification for Seamless Red Brass Pipe, Standard Sizes | |
B 75-95a | Specification for Seamless Copper Tube | |
B 88-93a | Specification for Seamless Copper Water Tube | |
B 152-94 | Specification for Copper Sheet, Strip Plate and Rolled Bar | |
B 251-93 | Specification for General Requirements for Wrought Seamless Copper and Copper-Alloy Tube | |
B 302-92 | Specification for Threadless Copper Pipe | |
B 306-95a | Specification for Copper Drainage Tube (DWV) | Table 702.1, Table 1102.4 |
B 447-93 | Specification for Welded Copper Tube | |
B 687-96 | Specification for Brass, Copper, and Chromium-Plated Pipe Nipples | |
B 813-93 | Standard Specification for Liquid and Paste Fixtures for Soldering Applications of Copper and Copper Alloy Tube | |
B 828-92 | Practice for Making Capillary Joints by Soldering of Copper and Copper Alloy Tube and Fittings | |
C 4-95 | Specification for Clay Drain Tile | |
C 14-95 | Specification for Concrete Sewer, Storm Drain, and Culvert Pipe | Table 702.3, Table 1102.4 |
C 76-95a | Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe | Table 702.3, Table 1102.4 |
C 425-95 | Specification for Compression Joints for Vitrified Clay Pipe and Fittings | |
C 428-92 | Specification for Asbestos-Cement Nonpressure Sewer Pipe | Table 1102.4 |
C 443-94 | Specification for Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets | |
C 508-94 | Specification for Asbestos-Cement Underdrain Pipe | Table 1102.5 |
C 564-95a | Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings | |
C 700-95 | Specification for Vitrified Clay Pipe, Extra Strength, Standard Strength, and Perforated | |
C 1053-95 | Specification for Borosilicate Glass Pipe and Fittings for Drain, Waste, and Vent (DWV) Applications | |
C 1173-97 | Specifications for Flexible Transition Couplings for Underground Piping Systems | |
C 1277-98 | Standard Specification for Shielded Couplings Joining Hubless Cast-iron Soil Pipe and Fittings | |
D 1869-95 | Specification for Rubber Rings for Asbestos-Cement Pipe | |
D 2564-93 | Specification for Solvent Cements for Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings | |
D 2661-96 | Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe and Fittings | Table 1102.4 |
D 2665-96 | Specification for Poly (Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings | |
D 2729-96 | Specification for Poly (Vinyl Chloride) (PVC) Sewer Pipe and Fittings | Table 1102.4, 1102.5 |
D 2751-96 | Specification for Acrylonitrile-Butadiene-Styrene (ABS) Sewer Pipe and Fittings | Table 1102.4 |
D 2846-96 | Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Hot and Cold Water Distribution Systems | |
D 2855-96 | Standard Practice for Making Solvent-Cemented Joints with Poly (Vinyl Chloride) (PVC) Pipe and Fittings | |
D 2949-96 | Specification for 3.25-in Outside Diameter Poly (Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings | Table 702.1 |
D 3034-96 | Specification for Type PSM Poly (Vinyl Chloride) (PVC) Sewer Pipe and Fittings | Table 1102.4 |
D 3212-96 | Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals | |
D 3311-94 | Specification for Drain, Waste and Vend (DWV) Plastic Fittings Patterns | Table 702.4 |
D 4551-96 | Specification for Poly (Vinyl Chloride) (PVC) Plastic Flexible Concealed Water-Containment Membrane | |
F 437-96 | Specification for Threaded Chlorinated Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80 | Table 605.6 |
F 438-93 | Specification for Socket-Type Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 40 | Table 605.6 |
F 439-93a | Specification for Socket-Type Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80 | Table 605.6 |
F 441-94 | Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80 | Table 605.5 |
F 442-94 | Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe (SDR- PR) | Table 605.5 |
F 477-96 | Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe | |
F 493-93a | Specification for Solvent Cements for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe and Fittings | |
F 628-96 | Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40 Plastic Drain, Waste and Vent Pipe with Cellular Core | Table 1102.4 |
F 656-96 | Specification for Primers for Use in Solvent Cement Joints of Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings | |
F 891-96 | Specification for Coextruded Poly (Vinyl Chloride) (PVC) Plastic Pipe with a Cellular Core | Table 1102.4, Table 1102.5 |
F 1412-99 | Specification for Polyolefin Pipe and Fittings for Corrosive Waste Drainage Systems | |
AWWA | American Water Works Association 6666 West Quincy Avenue Denver, CO 80235 | |
Standard Reference Number | Title | Referenced in code section number |
C 104-95 | Cementmortar Lining for Ductileiron Pipe and Fittings for Water | |
C 110-93 | Standard for Ductile-Iron and Gray-Iron Fittings, 3 Inch through 48 Inches, for Water and Other Liquids | |
C 111-95 | Rubber Gasket Joints for Ductile Iron Pressure Pipe and Fittings | |
C 115-99 | Flanged Ductile-Iron Pipe with Ductile-Iron or Gray-Iron Threaded Flanges | |
C 151-91 | Standard for Ductile-Iron Pipe, Centrifugally Cast for Water or Other Liquids | |
C 153-00 | Ductile-Iron Compact Fittings for Water Service | Table 605.6 |
C 510-95 | Double Check Valve Backflow-Prevention Assembly | |
C 511-92 | Reduced-Pressure Principle Backflow-Prevention Assembly | |
CSA | Canadian Standards Association 178 Rexdale Blvd. Rexdale (Toronto), Ontario, Canada M9W IR3 | |
Standard Reference Number | Title | Referenced in code section number |
A257.1-92 | Circular Concrete Culvert, Storm Drain, Sewer Pipe and Fittings | Table 702.3, Table 1102.4 |
A257.3-92 | Joints for Circular Concrete Sewer and Culvert Pipe, Manhole Sections, and Fittings Using Rubber Gaskets | |
B45.1-94 | Ceramic Plumbing Fixtures | |
B45.2-94 | Enameled Cast-Iron Plumbing Fixtures | |
B45.3-94 | Porcelain Enameled Steel Plumbing Fixtures | |
B45.4-94 | Stainless-Steel Plumbing Fixtures | |
B45.5-94 | Plastic Plumbing Fixtures | |
B64.7-94 | Vacuum Breakers, Laboratory Faucet Type (LFVB) | Table 608.1 |
B64.10-94 | Manual for the Selection, Installation, Maintenance and Field Testing of Backflow Prevention Devices | |
B79-79 | Floor, Area and Shower Drains, and Cleanouts for Residential Construction | |
B137.6-83 | CPVC Pipe, Tubing and Fittings for Hot and Cold Water Distribution Systems | Table 605.5 |
B181.1-96 | ABS Drain, Waste, and Vent Pipe and Pipe Fitting | Table 702.1 |
B182.2-95 | PVC Sewer Pipe and Fittings (PSM Type) | |
CAN/CSA-A257.2-92 | Reinforced L Circular Concrete Culvert, Storm Drain, Sewer Pipe and Fittings | Table 702.3, Table 1102.4 |
CAN/CSA-B64.1.1-94 | Vacuum Breakers, Atmoshperic Type (AVB) | |
CAN/CSA-B64.2-94 | Vacuum Breakers, Hose Connection Type (HCVB) | |
CAN/CSA-B64.2.2-94 | Vacuum Breakers, Hose Connection Type (HCVB) with Automatic Draining Feature | |
CAN/CSA-B64.3-94 | Backflow Preventers, Dual Check Valve Type with Atmospheric Port (DCAP) | |
CAN/CSA-B64.4-94 | Backflow Preventers, Reduced Pressure Principle Type (RP) | |
CAN/CSA-B125-94 | Plumbing Fittings | |
CAN/CSA-B137.3-93 | Rigid Poly (Vinyl Chloride) (PVC) Pipe for Pressure Applications | |
CAN/CSA-B181.1-96 | ABS Drain, Waste, and Vent Pipe and Pipe Fittings | |
CAN/CSA-B181.2-90 | PVC Drain, Waste, and Vent Pipe and Pipe Fittings | |
CAN/CSA-B182.1-92 | Plastic Drain and Sewer Pipe and Pipe Fittings | |
CAN/CSA-B182.2-83 | PVC Sewer Pipe and Fittings (PSM Type) | |
CAN/CSA-B182.4-92 | Profile PVC Sewer Pipe and Fittings | Table 1102.4, Table 1102.5 |
CAN/CSA-B602-90 | Mechanical Couplings for Drain, Waste, and Vent Pipe and Sewer Pipe | |
CSA-B45-88 | (Supplement 1) – Hydromassage Bathtubs | |
CISPI | Cast Iron Soil Pipe Institute Suite 419 5959 Shallowford Road Chattanooga, TN 37421 | |
Standard Reference Number | Title | Referenced in code section number |
301-95 | Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste and Vent Piping Applications | |
310-95 | Specification for Coupling for Use in Connection with Cast-Iron Soil Pipe and Fittings for Sanitary and Storm Drain Waste and Vent Piping Applications |
FS | Federal Specification General Service Administration 7th & D Streets Specification Section, Room 6039 Washington, DC 20407 | |
Standard Reference Number | Title | Referenced in code section number |
TT-P-1536a-75 | Federal Specification for Plumbing Fixture Setting Compound |
NSF | National Sanitation Foundation 3475 Plymouth Road P.O. Box 130140 Ann Arbor, MI 48113-0140 | |
Standard Reference Number | Title | Referenced in code section number |
14-90 | Plastic Piping Components and Related Materials | |
42-88 | Drinking Water Treatment Units – Aesthetic Effects | |
53-96 | Drinking Water Treatment Units – Health Effects | |
58-96 | Reverse Osmosis Drinking Water Treatment Systems | |
61-95 | Drinking Water System Components – Health Effects |
PDI | Plumbing and Drainage Institute 1106 West 77th Street, South Drive Indianapolis, IN 46260-3318 | |
Standard Reference Number | Title | Referenced in code section number |
G101-85 | Testing and Rating Procedure for Grease Interceptors with Appendix of Sizing and Installation Data |
For a printer-friendly PDF version of Appendix A, please click here.
The following is a procedure that shall be used in calculating the minimum sizing of the water supply system:
Step 1. Compute the total number of fixture units from Table 18-29-604.10.1, Demand Weight of Fixtures in Fixture Units.
1. For supply outlets likely to impose continuous demands, estimate continuous supply separately and add to total demand for fixtures.
2. For fixtures not listed, weights may be assumed by comparing the fixture to a listed one using water in similar quantities and at similar rates.
3. The given weights are for total demand. For fixtures with both hot and cold water supplies, the weights for maximum separate demand may be taken as three-fourths the listed demand for supply.
Fixture Type | Occupancy Use | Valve Type | Fixture Units |
Fixture Type | Occupancy Use | Valve Type | Fixture Units |
Water Closet | Public | Flush Valve | 10 |
Water Closet | Public | Flush Tank | 5 |
Urinal 1" | Public | Flush valve | 10 |
Urinal 3/4" | Public | Flush valve | 5 |
Urinal Tank | Public | Flush tank | 3 |
Lavatory | Public | Faucet | 2 |
Bathtub | Public | Faucet | 4 |
Shower head | Public | Mixing valve | 4 |
Service sink | Office, etc. | Faucet | 3 |
Kitchen sink | Hotel or restaurant | Faucet | 4 |
Water closet | Private | Flush valve | 6 |
Water closet | Private | Flush tank | 3 |
Lavatory | Private | Faucet | 1 |
Bathtub | Private | Faucet | 2 |
Shower head | Private | Mixing valve | 2 |
Bathroom group | Private | Flush valve for closet | 8 |
Bathroom group | Private | Flush tank for closet | 4 |
Separate shower 109 | Private | Mixing valve | 2 |
Kitchen sink | Private | Faucet | 2 |
Laundry trays (1 to 3) | Private | Faucet | 2 |
Combination fixture | Private | Faucet | 3 |
Laundry washer | Private | Faucet | 2 |
Bidet | Private | Faucet | 2 |
Dishwasher | – | – | 2 |
Drinking fountain | – | – | 1/2 |
Laundry washer | Public | 8 lbs | 3 |
Laundry washer | Public | 15 lbs | 4 |
Water closet | Public/Private | Flushometer tank | 2 |
Step 2. Using Table 18-29-604.10.2, convert the total water demand from fixture units to gallons per minutes (gpm). Add any continuous supply demand in gpm such as lawn sprinklers, air conditioning, industrial uses, etc., to the sum of the total demand for fixtures. The result is the total required gpm demand. All distributing pipes, riser pipes and branch distributing pipes shall be sized in accordance with the demand indicated in Table 18-29-604.10.2 of this chapter.
Beyond the capacity listed in Table 18-29-604.10.2, the service pipe, main supply pipe, principal supply pipe and the branch supply pipe shall be sized to meet the velocity of water flow provisions of this chapter. Data shall be provided by the designer to substantiate this.
For Systems Predominantly Flush Tanks | For Systems Predominantly for Flush Valves | ||
Load | Demand | Load | Demand |
For Systems Predominantly Flush Tanks | For Systems Predominantly for Flush Valves | ||
Load | Demand | Load | Demand |
1 | 1.5 | 1 | – |
2 | 2.5 | 2 | – |
3 | 3.3 | 3 | – |
4 | 4.0 | 4 | – |
5 | 4.8 | 5 | 15.0 |
6 | 5.5 | 6 | 17.5 |
7 | 5.7 | 7 | 19.7 |
8 | 6.9 | 8 | 22.2 |
9 | 7.5 | 9 | 24.5 |
10 | 8.2 | 10 | 27.0 |
11 | 8.8 | 11 | 27.8 |
12 | 9.5 | 12 | 28.5 |
13 | 10.1 | 13 | 29.5 |
14 | 10.8 | 14 | 30.1 |
15 | 11.4 | 15 | 31.0 |
16 | 12.0 | 16 | 31.8 |
17 | 12.5 | 17 | 32.6 |
18 | 13.0 | 18 | 33.5 |
19 | 13.5 | 19 | 34.2 |
20 | 14.2 | 20 | 35.0 |
25 | 17.0 | 25 | 38.2 |
30 | 19.4 | 30 | 41.5 |
35 | 21.8 | 35 | 43.6 |
40 | 24.3 | 40 | 46.0 |
45 | 26.8 | 45 | 48.2 |
50 | 29.0 | 50 | 50.5 |
For Systems Predominantly for Flush Tanks | For Systems Predominantly for Flush Valves | ||
Load W.S.F.U. | Demand GPM | Load W.S.F.U. | Demand GPM |
For Systems Predominantly for Flush Tanks | For Systems Predominantly for Flush Valves | ||
Load W.S.F.U. | Demand GPM | Load W.S.F.U. | Demand GPM |
60 | 32.0 | 60 | 54.6 |
70 | 35.0 | 70 | 58.7 |
80 | 38.0 | 80 | 61.5 |
90 | 41.0 | 90 | 65.0 |
100 | 44.0 | 100 | 68.0 |
120 | 48.0 | 120 | 74.0 |
140 | 53.0 | 140 | 78.0 |
160 | 57.0 | 160 | 82.0 |
180 | 61.0 | 180 | 86.0 |
200 | 65.0 | 200 | 90.0 |
225 | 70.0 | 225 | 95.0 |
250 | 75.0 | 250 | 100.0 |
275 | 80.0 | 275 | 102.0 |
300 | 85.0 | 300 | 106.0 |
400 | 105.0 | 400 | 125.0 |
500 | 124.0 | 500 | 142.0 |
750 | 170.0 | 750 | 176.0 |
1,000 | 208.0 | 1,000 | 208.0 |
1,250 | 237.0 | 1,250 | 237.0 |
1,500 | 262.0 | 1,500 | 262.0 |
1,750 | 283.0 | 1,750 | 283.0 |
2,000 | 302.0 | 2,000 | 302.0 |
2,500 | 337.0 | 2,500 | 337.0 |
3,000 | 362.0 | 3,000 | 362.0 |
3,500 | 387.0 | 3,500 | 387.0 |
4,000 | 412.0 | 4,000 | 412.0 |
Step 3. Determine the elevation of the highest fixture or group of fixtures or water opening above the city water main or other source of pressure supply. Multiply this elevation in feet by 0.434. The result is the loss in static pressure in pounds per square inch (psi).
Step 4. Compute the size of meter necessary for a total water demand.
Step 5. Compute the pressure loss through the meter. For pressure losses, consult manufacturer's data.
Step 6. Compute the available pressure to overcome friction in the piping system. First compute all losses (see below):
1) Subtract the above losses from the minimum service pressure in the water main or other source of supply. The remaining is the available pressure to overcome friction within an upfeed piping system.
2) For gravity water tanks, determine the vertical distance between the incoming water service, the minimum tank water line, and the highest fixture or group of fixtures or water opening. To find the available pressure to overcome friction in the downfeed piping system, multiply the distance defined above by 0.434, then subtract the above losses from this pressure. The remaining is the available pressure to overcome friction within the downfeed piping system.
Step 7. Compute the developed length of the basic circuit of piping from the main in the street, the house pump, the outlet side of the pressure-reducing valve or other source of supply pressure to the highest and farthest outlet.
For a gravity water tank, compute the developed length of the basic circuit of the piping from the tank connection to the highest and most remote outlet. Developed length plus 50 percent will approximate the equivalent length run (ELR).
Step 8. Compute the pressure factor per 100 feet of developed length. From the above calculations, take the pressure available for friction loss in psi, (Step 6) divide by the equivalent length run (ELR) (Step 7) and multiply by 100 to ascertain the maximum uniform pressure loss for friction in the piping of the basic circuit. (See Table 18-29-604.10.3)
Step 9. Knowing the permissible uniform friction loss per 100 feet of pipe and the fixture gpm and all continuous demands in gpm, the diameter of the building service and main supply pipe to the cold and hot water branch or the first branch may be obtained from Table 18-29-604.10.2.
The diameter of pipe on the coordinate point corresponding to the estimated demand and the permissible uniform friction loss shall be the size of the service and main supply pipe to cold and hot water branch or the first branch.
All other piping in the water supply system shall be sized according to the full-listed demand weight, with the exception of piping that supplies fixtures with both cold and hot water, which may be sized at three-fourths of the listed demand weight for cold or hot water piping. All continuous demands on the piping system shall be included in the fixture gpm demand.
For fixtures not listed, demand weights may be assumed by comparing the fixture to a listed one using water in similar quantities and at similar rates.
The cold and hot water principal supply pipe, branches and risers may be obtained from either Table 18-29-604.10.3 or 18-29-604.10.4, whichever is applicable. The diameter of pipe on or directly above the coordinate point corresponding to the estimated demand and the permissible uniform friction loss shall be the size of the pipe.
No service shall be less than 1 inch nominal pipe size. Where 1 inch flushometer valves are used, the minimum size of water service shall be a 1 1/2 inch nominal pipe size and the minimum size of the riser shall be a 1 1/4 inch nominal pipe size. No riser shall be less than 3/4 inch nominal pipe size.
Diameter of Fitting (Inches) | 90-DEG Standard ELL (Feet) | 45-DEG Standard ELL (Feet) | 90-DEG Side Tee (Feet) | Coupling or Straight Run of Tee (Feet) | Gate Valve (Feet) | Globe Valve (Feet) | Angle Valve (feet) |
Diameter of Fitting (Inches) | 90-DEG Standard ELL (Feet) | 45-DEG Standard ELL (Feet) | 90-DEG Side Tee (Feet) | Coupling or Straight Run of Tee (Feet) | Gate Valve (Feet) | Globe Valve (Feet) | Angle Valve (feet) |
3/8 | 1 | 0.6 | 1.5 | 0.3 | 0.2 | 8 | 4 |
1/2 | 2 | 1.2 | 3 | 0.6 | 0.4 | 15 | 8 |
3/4 | 2.5 | 1.5 | 4 | 0.8 | 0.5 | 20 | 12 |
1 | 3 | 1.8 | 5 | 0.9 | 0.6 | 25 | 15 |
1 1/4 | 4 | 2.4 | 6 | 1.2 | 0.8 | 35 | 18 |
1 1/2 | 5 | 3 | 7 | 1.5 | 1.0 | 45 | 22 |
2 | 7 | 4 | 10 | 2 | 1.3 | 55 | 28 |
2 1/2 | 8 | 5 | 12 | 2.5 | 1.6 | 65 | 34 |
3 | 10 | 6 | 15 | 3 | 2 | 80 | 40 |
3 1/2 | 12 | 7 | 18 | 3.6 | 2.4 | 100 | 50 |
4 | 14 | 8 | 21 | 4.0 | 2.7 | 125 | 55 |
5 | 17 | 10 | 25 | 5 | 3.3 | 140 | 70 |
6 | 20 | 12 | 30 | 6 | 4 | 165 | 80 |
(Amend Coun. J. 3-27-02, p. 82090, § 3; Amend Coun. J. 11-9-16, p. 36266, § 37)