In occupancies where plumbing fixtures are installed for private use, hot water shall be required for bathing, washing, laundry, cooking purposes, dishwashing or maintenance. In occupancies where plumbing fixtures are installed for public use, hot water shall be required for bathing and washing purposes. This requirement shall not supersede the requirements for individual temperature control limitations for public lavatories and public and private bidets, bathtubs, whirlpool bathtubs, and shower control valves.
Except as required by Section 601.3.3, nonpotable water systems shall have a yellow background with black uppercase lettering, with the words "CAUTION: NONPOTABLE WATER, DO NOT DRINK." Each nonpotable system shall be identified to designate the liquid being conveyed, and the direction of normal flow shall be clearly shown. The minimum size of the letters and length of the color field shall comply with Table 601.3.2.
The background color and required information shall be indicated every 20 feet (6096 mm) but not less than once per room, and shall be visible from the floor level.
MINIMUM LENGTH OF COLOR FIELD AND SIZE OF LETTERS
|OUTSIDE DIAMETER OF PIPE OR COVERING
|MINIMUM LENGTH OF COLOR FIELD
|MINIMUM SIZE OF LETTERS
|1/2 to 11/4||8||1/2|
|11/2 to 2||8||3/4|
|21/2 to 6||12||11/4|
|8 to 10||24||21/2|
For SI units: 1 inch = 25.4 mm
- Gray water systems shall be marked in accordance with this section with the words "CAUTION: NON POTABLE GRAY WATER, DO NOT DRINK" in black letters.
- Reclaimed (recycled) water systems shall be marked in accordance with this section with the words: "CAUTION: NONPOTABLE RECLAIMED (RECYCLED) WATER, DO NOT DRINK" in black letters.
- On-site treated water systems shall be marked in accordance with this section with the words: "CAUTION: ON-SITE TREATED NONPOTABLE WATER, DO NOT DRINK" in black letters.
- Rainwater catchment systems shall be marked in accordance with this section with the words: "CAUTION: NONPOTABLE RAINWATER WATER, DO NOT DRINK" in black letters.
No person shall install any water operated equipment or mechanism, or use any water treating chemical or substance, if it is found that such equipment, mechanism, chemical or substance may cause pollution or contamination of the domestic water supply. Such equipment or mechanism may be permitted only when equipped with an approved backflow prevention device or assembly.
All devices or assemblies installed in a potable water supply system for protection against backflow shall be maintained in good working condition by the person or persons having control of such devices or assemblies. Such devices or assemblies shall be tested in accordance with Section 603.4.2 and WAC 246-290-490. If found to be defective or inoperative, the device or assembly shall be replaced or repaired. No device or assembly shall be removed from use or relocated or other device or assembly substituted, without the approval of the authority having jurisdiction.
Testing shall be performed by a Washington state department of health certified backflow assembly tester.
|DEGREE OF HAZARD|
|DEVICE, ASSEMBLY, OR METHOD1||APPLICABLE STANDARDS||POLLUTION
|X||—||X||—||See Table 603.3.1 in this chapter.|
|Air gap fittings for use with plumbing fixtures, appliances, and appurtenances||ASME
|X||—||X||—||Air gap fitting is a device with an internal air gap, and typical installation includes plumbing fixtures, appliances, and appurtenances. The critical level shall not be installed below the flood level rim.|
|Atmospheric vacuum breaker (consists of a body, checking member and atmospheric port)||ASSE 1001 or CSA B64.1.1||X||—||X||—||Upright position. No valve downstream. Minimum of 6 inches or listed distance above all downstream piping and flood level rim of receptor.4,5|
|Antisiphon fill valve (ballcocks) for gravity water closet flush tanks and urinal tanks||ASSE 1002/
|X||—||X||—||Installation of gravity water closet flush tank and urinal tanks with the fill valve installed with the critical level not less than 1 inch above the opening of the overflow pipe.4,5|
|Vacuum breaker wall hydrants, hose bibbs, freeze resistant, automatic draining type||ASSE 1019 or CSA B18.104.22.168||X||—||X||—||Installation includes wall hydrants and hose bibbs. Such devices are not for use under continuous pressure conditions (means of shutoff downstream of device is prohibited).4,5|
|Hose connection vacuum breakers||ASSE 1011||X||—||X||—||Such devices are not for use under continuous pressure conditions. No valve downstream.4,6|
|Hose connection backflow preventers||ASSE 1052||X||—||X||—||Such devices are not for use under continuous pressure conditions 4,6|
|Dual check backflow preventer wall hydrants, freeze resistant||ASSE 1053||X||—||X||—||Such devices are not for use under continuous pressure conditions.4|
|Freeze resistant sanitary yard hydrants||ASSE 1057||X||—||X||—||Such devices are not for use under continuous pressure conditions.4|
|Spill-Resistant Pressure Vacuum Breaker (single check valve with air inlet vent and means of field testing)||ASSE 1056||X||—||X||—||Upright position. Minimum of 12 inches or listed distance above all downstream piping and flood-level rim of receptor.5|
|Double Check Valve Backflow Prevention Assembly (two independent check valves and means of field testing)||ASSE 1015; AWWA C510; CSA B64.5 or CSA B64.5.1||X||X||—||—||Horizontal unless otherwise listed. Access and clearance shall be in accordance with the manufacturer's instructions, and not less than a 12 inch clearance at the bottom for maintenance. May need platform/ladder for test and repair.
Does not discharge water.
|Double Check Detector Fire Protection Backflow Prevention Assembly (two independent check valves with a parallel detector assembly consisting of a water meter and a double check valve backflow prevention assembly and means for field testing)||ASSE 1048||X||X||—||—||Horizontal unless otherwise listed. Access and clearance shall be in accordance with the manufacturer's instructions, and not less than a 12 inch clearance at the bottom for maintenance. May need platform/ladder for test and repair. Does not discharge water. Installation includes a fire protection system and is designed to operate under continuous pressure conditions.|
|Pressure Vacuum Breaker Backflow Prevention Assembly (loaded air inlet valve, internally loaded check valve and means for field testing)||ASSE 1020 or CSA B64.1.2||X||—||X||—||Upright position. May have valves downstream. Minimum of 12 inches above all downstream piping and flood-level rim of the receptor. May discharge water.|
|Reduced Pressure Principle Backflow Prevention Assembly (two independently acting loaded check valves, a differential pressure relief valve and means for field testing)||ASSE 1013;
CSA B64.4 or CSA B64.4.1
|X||X||X||X||Horizontal unless otherwise listed. Access and clearance shall be in accordance with the manufacturer's instructions, and not less than a 12 inch clearance at the bottom for maintenance. May need platform/ladder for test and repair. May discharge water.|
|Reduced Pressure Detector Fire Protection Backflow Prevention Assembly (two independently acting loaded check valves, a differential pressure relief valve, with a parallel detector assembly consisting of a water meter and a reduced-pressure principle backflow prevention assembly, and means for field testing)||ASSE 1047||X||X||X||X||Horizontal unless otherwise listed. Access and clearance shall be in accordance with the manufacturer's instructions, and not less than a 12 inch clearance at the bottom for maintenance. May need platform/ladder for test and repair. May discharge water. Installation includes a fire protection system and is designed to operate under continuous pressure conditions.|
For SI units: 1 inch = 25.4 mm
1 See the description of devices and assemblies in this chapter.
2 Installation in pit or vault requires previous approval by the Authority Having Jurisdiction.
3 Refer to the general and specific requirement for installation.
4 Not to be subjected to operating pressure for more than 12 hours in a 24 hour period.
6 Shall be installed in accordance with Section 603.5.7.
|FIXTURES||WHERE NOT AFFECTED BY SIDEWALLS1
|WHERE AFFECTED BY SIDEWALLS2
|Effective openings3 not greater than 1/2 of an inch in diameter||1||11/2|
|Effective openings3 not greater than 3/4 of an inch in diameter||11/2||21/4|
|Effective openings3 not greater than 1 inch in diameter||2||3|
|Effective openings3 greater than 1 inch in diameter||Two times the diameter of effective opening||Three times the diameter of effective opening|
For SI units: 1 inch = 25.4 mm
1 Sidewalls, ribs, or similar obstructions do not affect air gaps where spaced from the inside edge of the spout opening a distance exceeding three times the diameter of the effective opening for a single wall, or a distance exceeding four times the effective opening for two intersecting walls.
2 Vertical walls, ribs, or similar obstructions extending from the water surface to or above the horizontal plane of the spout opening other than specified in Footnote 1 above. The effect of three or more such vertical walls or ribs has not been determined. In such cases, the air gap shall be measured from the top of the wall.
3 The effective opening shall be the minimum cross-sectional area at the seat of the control valve or the supply pipe or tubing that feeds the device or outlet. Where two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas of the individual supply lines or the area of the single outlet, whichever is smaller.
4 Air gaps less than 1 inch (25.4 mm) shall be approved as a permanent part of a listed assembly that has been tested under actual backflow conditions with vacuums of 0 to 25 inches of mercury (85 kPa).
- At the time of installation, repair or relocation; and
- At least on an annual schedule thereafter, unless more frequent testing is required by the authority having jurisdiction.
- An approved air gap.
- A listed vacuum breaker installed on the discharge side of the last valve with the critical level not less than 6 inches (152 mm) or in accordance with its listing.
- A backflow preventer suitable for the degree of hazard, installed in accordance with the requirements for that type of device or assembly as set forth in this chapter.
- Atmospheric vacuum breaker (AVB).
- Pressure vacuum breaker backflow prevention assembly (PVB).
- Spill-resistant pressure vacuum breaker (SVB).
- Reduced pressure principle backflow prevention assembly (RP).
- A double check valve backflow prevention assembly (DC) may be allowed when approved by the water purveyor and the authority having jurisdiction.
- Double check valve backflow prevention assembly (DC).
- Double check detector fire protection backflow prevention assembly.
- Reduced pressure principle backflow prevention assembly (RP).
- Reduced pressure detector fire protection backflow prevention assembly.
Potable water supplies to fire protection systems that are not normally under pressure shall be protected from backflow and shall meet the requirements of the appropriate standard(s) referenced in Table 1701.1.
- Reduced pressure principle backflow prevention assembly (RP)
- Reduced pressure detector fire protection backflow prevention assembly
Nonpotable water sources include fire department vehicles carrying water of questionable quality or water that is treated with antifreeze, corrosion inhibitors, or extinguishing agents.
- The unit is equipped with a submerged fill line.
- The potable water supply is directly connected to the unit circulation system.
|MATERIAL||BUILDING SUPPLY PIPE AND FITTINGS||WATER DISTRIBUTION PIPE AND FITTINGS||REFERENCED STANDARD(S) PIPE||REFERENCED STANDARD(S) FITTINGS|
|Copper and Copper Alloys||X||X||ASTM B42, ASTM B43, ASTM B75, ASTM B88, ASTM B135, ASTM B251, ASTM B302, ASTM B447||ASME B16.15, ASME B16.18, ASME B 16.22, ASME B 16.26, ASME B16.502, ASME B16.51, ASSE 1061|
|CPVC||X||X||ASTM D2846, ASTM F441, ASTM F442, CSA B137.6||ASSE 1061, ASTM D2846, ASTM F437, ASTM F438, ASTM F439, ASTM F1970, CSA B137.6|
|CPVC-AL-CPVC||X||X||ASTM F2855||ASTM D2846|
|Ductile-Iron||X||X||AWWA C151||ASME B16.4, AWWA C110, AWWA C153|
|Galvanized Steel||X||X||ASTM A53||—|
|Malleable Iron||X||X||—||ASME B16.3|
|PE||X1||—||ASTM D2239, ASTM D2737, ASTM D3035, AWWA C901, CSA B137.1||ASTM D2609, ASTM D2683, ASTM D3261, ASTM F1055, CSA B137.1|
|PE-AL-PE||X||X||ASTM F1282, CSA B137.9||ASTM F1282, ASTM F1974, CSA B137.9|
|PE-AL-PEX||X||X||ASTM F1986||ASTM F1986|
|PE-RT||X||X||ASTM F2769, CSA B137.18||ASTM D3261, ASTM F1055, ASSE 1061, ASTM F1807, ASTM F2098, ASTM F2159, ASTM F2735, ASTM F2769, CSA B137.18|
|PEX||X||X||ASTM F876, ASTM F877, CSA B137.5, AWWA C9041||ASSE 1061, ASTM F877, ASTM F1807, ASTM F1960, ASTM F1961, ASTM F2080, ASTM F2159, ASTM F2735, CSA B137.5|
|PEX-AL-PEX||X||X||ASTM F1281, CSA B137.10, ASTM F2262||ASTM F1281, ASTM F1974, ASTM F2434, CSA B137.10|
|PP||X||X||ASTM F2389, CSA B137.11||ASTM F2389, CSA B137.11|
|PVC||X1||—||ASTM D1785, ASTM D2241, AWWA C900||ASTM D2464, ASTM D2466, ASTM D2467, ASTM F1970, AWWA C907|
|Stainless Steel||X||X||ASTM A269, ASTM A312||—|
1 For building supply or exterior cold-water applications, not for water distribution piping.
2 For brazed fittings only.
- Pipes, pipe fittings, plumbing fittings, fixtures, or backflow preventers used for nonpotable services such as manufacturing, industrial processing, irrigation, outdoor watering, or any other uses where the water is not used for human consumption.
- Flush valves, fill valves, flushometer valves, tub fillers, shower valves, service saddles, or water distribution main gate valves that are 2 inches (50 mm) in diameter or larger.
- Fixture Connectors — 30 inches (762 mm)
- Washing Machine Connectors — 72 inches (1829 mm)
- Dishwasher and Icemaker Connectors — 120 inches (3048 mm)
PVC piping shall not be exposed to direct sunlight unless the piping does not exceed 24 inches (610 mm) and is wrapped with not less than 0.04 of an inch (1.02 mm) thick tape or otherwise protected from UV degradation.
Parallel water distribution systems shall provide a control valve either immediately ahead of each fixture being supplied or installed at the manifold, and shall be identified with the fixture being supplied. Where parallel water distribution system manifolds are located in attics, crawl spaces, or other locations not accessible, a separate shutoff valve shall be required immediately ahead of each individual fixture or appliance served.
An approved expansion tank shall be installed in the cold water distribution piping downstream of each such regulator to prevent excessive pressure from developing due to thermal expansion and to maintain the pressure setting of the regulator. Expansion tanks used in potable water systems intended to supply drinking water shall comply with NSF 61. The expansion tank shall be properly sized and installed in accordance with the manufacturer's installation instructions and listing. Systems designed by registered design professionals shall be permitted to use approved pressure relief valves in lieu of expansion tanks provided such relief valves have a maximum pressure relief setting of 100 psi (689 kPa) or less.
- Equal to the size of the valve outlet and shall discharge full size to the flood level of the area receiving the discharge and pointing down.
- Materials shall be rated at not less than the operating temperature of the system and approved for such use or shall comply with ASME A112.4.1.
- Discharge pipe shall discharge independently by gravity through an air gap into the drainage system or outside of the building with the end of the pipe not exceeding 2 feet (610 mm) and not less than 6 inches (152 mm) above the ground pointing downwards.
- Discharge in such a manner that does not cause personal injury or structural damage.
- No part of such discharge pipe shall be trapped or subject to freezing.
- The terminal end of the pipe shall not be threaded.
- Discharge from a relief valve into a water heater pan shall be prohibited.
- The bottom of the water pipe shall be not less than 12 inches (305 mm) above the top of the sewer or drain line.
- The water pipe shall be placed on a solid shelf excavated at one side of the common trench with a clear horizontal distance of not less than 12 inches (305 mm) from the sewer or drain line.
Water pipes crossing sewer or drainage piping constructed of clay or materials that are not approved for use within a building shall be laid not less than 12 inches (305 mm) above the sewer or drain pipe.
- Ferrous piping shall have a protective coating of an approved type; machine applied and in accordance with recognized standards. Field wrapping shall provide equivalent protection and shall be restricted to those short sections and fittings necessarily stripped for threading. Zinc coating (galvanizing) shall not be deemed adequate protection for piping or fittings. Approved nonferrous piping shall not be required to be wrapped.
- Copper or copper alloy tubing shall be installed without joints where possible. Where joints are permitted, they shall be brazed, and fittings shall be wrought copper.
For the purpose of this section, "within a building" shall mean within the fixed limits of the building foundation.
- Provide access to connect a building supply to an available public water service where proper cause and legal easement not in violation of other requirements have been first established to the satisfaction of the Authority Having Jurisdiction.
- Provide additional space for a building supply where the proper cause, transfer of ownership, or change of boundary not in violation of other requirements have been first established to the satisfaction of the Authority Having Jurisdiction. The instrument recording such action shall constitute an agreement with the Authority Having Jurisdiction, which shall clearly state and show that the areas so joined or used shall be maintained as a unit during the time they are so used. Such an agreement shall be recorded in the office of the County Recorder as a part of the conditions of ownership of said properties, and shall be binding on heirs, successors, and assigns to such properties. A copy of the instrument recording such proceedings shall be filed with the Authority Having Jurisdiction.
- The pipe system shall be flushed with clean, potable water until potable water appears at the points of outlet.
- The system or parts thereof shall be filled with a water-chlorine solution containing not less than 50 parts per million of chlorine, and the system or part thereof shall be valved-off and allowed to stand for twenty-four hours; or, the system or part thereof shall be filled with a water-chlorine solution containing not less than 200 parts per million of chlorine and allowed to stand for three hours.
- Following the allowed standing time, the system shall be flushed with clean, potable water until the chlorine residual in the water coming from the system does not exceed the chlorine residual in the flushing water.
- The procedure shall be repeated when a standard bacteriological test for drinking water, performed by a laboratory certified for drinking water in Washington state, shows unsatisfactory results indicating that contamination persists in the system.
No water filter, water softener, backflow prevention device, or similar device regulated by this code shall be installed in a potable water supply piping where the installation of such device produces an excessive pressure drop in such water supply piping. In the absence of specific pressure drop information, the diameter of the inlet or outlet of such device or its connecting piping shall be not less than the diameter of such water distribution piping to the fixtures served by the device.
Such devices shall be of a type approved by the Authority Having Jurisdiction and shall be tested for flow rating and pressure loss by an approved laboratory or recognized testing agency to standards consistent with the intent of this chapter.
|APPLIANCES, APPURTENANCES OR FIXTURES2||MINIMUM FIXTURE BRANCH PIPE SIZE1,4
|Bathtub or Combination Bath/Shower (fill)||1/2||4.0||4.0||—|
|3/4 inch Bathtub Fill Valve||3/4||10.0||10.0||—|
|Dental Unit, cuspidor||1/2||—||1.0||—|
|Drinking Fountain or Water Cooler||1/2||0.5||0.5||0.75|
|Hose Bibb, each additional8||1/2||1.0||1.0||—|
|Lawn Sprinkler, each head5||—||1.0||1.0||—|
|Mobile Home, each (minimum)||—||12.0||—||—|
|Clinical Flushometer Valve with or without faucet||1||—||8.0||—|
|Kitchen, domestic with or without dishwasher||1/2||1.5||1.5||—|
|Service or Mop Basin||1/2||1.5||3.0||—|
|Washup, each set of faucets||1/2||—||2.0||—|
|Shower, per head||1/2||2.0||2.0||—|
|Urinal, 1.0 GPF Flushometer Valve||3/4||See Footnote7||—|
|Urinal, greater than 1.0 GPF Flushometer Valve||3/4||See Footnote7||—|
|Urinal, flush tank||1/2||2.0||2.0||3.0|
|Wash Fountain, circular spray||3/4||—||4.0||—|
|Water Closet, 1.6 GPF Gravity Tank||1/2||2.5||2.5||3.5|
|Water Closet, 1.6 GPF Flushometer Tank||1/2||2.5||2.5||3.5|
|Water Closet, 1.6 GPF Flushometer Valve||1||See Footnote7||—|
|Water Closet, greater than 1.6 GPF Gravity Tank||1/2||3.0||5.5||7.0|
|Water Closet, greater than 1.6 GPF Flushometer Valve||1||See Footnote7||—|
For SI units: 1 inch = 25 mm
2 Appliances, appurtenances, or fixtures not referenced in this table shall be permitted to be sized by reference to fixtures having a similar flow rate and frequency of use.
3 The listed fixture unit values represent their load on the cold water building supply. The separate cold water and hot water fixture unit value for fixtures having both hot and cold water connections shall be permitted to be each taken as three-quarter of the listed total value of the fixture.
5 For fixtures or supply connections likely to impose continuous flow demands, determine the required flow in gallons per minute (gpm) (L/s), and add it separately to the demand in gpm (L/s) for the distribution system or portions thereof.
6 Assembly [Public Use (See Table 422.1)].
7 Where sizing flushometer systems, see Section 610.10.
8 Reduced fixture unit loading for additional hose bibbs is to be used where sizing total building demand and for pipe sizing where more than one hose bibb is supplied by a segment of water distribution pipe. The fixture branch to each hose bibb shall be sized on the basis of 2.5 fixture units.
Listed parallel water distribution systems shall be installed in accordance with their listing.
|METER AND STREET SERVICE
|BUILDING SUPPLY AND BRANCHES
|MAXIMUM ALLOWABLE LENGTH
|PRESSURE RANGE — 30 to 45 psi1|
|PRESSURE RANGE — 46 to 60 psi1|
|PRESSURE RANGE — Over 60 psi1|
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 pound-force per square inch = 6.8947 kPa
1 Available static pressure after head loss.
2 Building supply, not less than 3/4 of an inch (20 mm) nominal size.
- Total number of fixture units as determined from Table 610.3, Equivalent Fixture Units, for the fixtures to be installed.
- Developed length of supply pipe from meter to the most remote outlet.
- Difference in elevation between the meter or other source of supply and the highest fixture or outlet.
- Pressure in the street main or another source of supply at the locality where the installation is to be made.
- In localities where there is a fluctuation of pressure in the main throughout the day, the water piping system shall be designed on the basis of the minimum pressure available.
- Determine the available pressure at the water meter or other source of supply.
- Add or subtract depending on positive or negative elevation change, 1/2 psi (3.4 kPa) for each foot (305 mm) of difference in elevation between such source of supply and the highest water supply outlet in the building or on the premises.
- Use the "pressure range" group within which this pressure will fall using Table 610.4.
- Select the "length" column that is equal to or longer than the required length.
- Follow down the column to a fixture unit value equal to or exceeding the total number of fixture units required by the installation.
- Having located the proper fixture unit value for the required length, sizes of meter and building supply pipe as found in the two left-hand columns shall be applied.
Where using Table 610.10 to size water piping, care shall be exercised to assign flushometer fixture units based on the number and category of fixtures served.
|FIXTURE CATEGORY: WATER CLOSET WITH FLUSHOMETER VALVES|
|NUMBER OF FLUSHOMETER VALVES||INDIVIDUAL FIXTURE UNITS ASSIGNED IN DECREASING VALUE||FIXTURE UNITS ASSIGNED FOR WATER CLOSETS AND SIMILAR 10-UNIT FIXTURES IN ACCUMULATIVE VALUES|
|5 or more||10 each||115 plus 10 for each additional fixture in excess of 5|
|FIXTURE CATEGORY: URINALS WITH FLUSHOMETER VALVES|
|NUMBER OF FLUSHOMETER VALVES||INDIVIDUAL FIXTURE UNITS ASSIGNED IN DECREASING VALUE||FIXTURE UNITS ASSIGNED FOR URINALS AND SIMILAR 5-UNIT FIXTURES IN ACCUMULATIVE VALUES|
|5 or more||5 each||58 plus 5 for each additional fixture in excess of 5|
|A:||1 WC = 40 F.U.|
|B:||2 WC = 70 F.U.|
|C:||2 WC (70) + 1 UR (20) = 90 F.U.|
|D:||2 WC (70) + 2 UR (35) = 105 F.U.|
|E:||2 WC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U.|
|F:||2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U.|
|G:||1 LAV = 1 F.U.|
|H:||2 LAV = 2 F.U.|
|I:||2 LAV (2) + 1 UR (20) = 22 F.U.|
|J:||2 LAV (2)+ 2 UR (35) = 37 F.U.|
|K:||2 LAV (2) + 2 UR (35) + 1 WC (40) = 77 F.U.|
|L:||2 LAV (2) + 2 UR (35) + 2 WC (70) = 107 F.U.|
|M:||4 WC (105) + 4 UR (53) + 4 LAV (4) = 162 F.U.|
|N:||1 WC = 40 F.U.|
|O:||1 WC (40) + 1 UR (20) = 60 F.U.|
|P:||1 WC (40) + 1 UR (20) + 1 LAV (1) = 61 F.U.|
|Q:||2 WC (70) + 1 UR (20) + 1 LAV (1) = 91 F.U.|
|R:||2 WC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U.|
|S:||2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U.|
|T:||6 WC (125) + 6 UR (63) + 6 LAV (6) = 194 F.U.|
SIZING METHOD FOR PUBLIC USE FIXTURES USING TABLE 610.10
- Water supply piping systems designed in accordance with recognized engineering procedures acceptable to the Authority Having Jurisdiction.
- Alteration of or minor additions to existing installations provided the Authority Having Jurisdiction finds that there will be an adequate supply of water to operate fixtures.
- Replacement of existing fixtures or appliances.
- Piping that is part of fixture equipment.
- Unusual conditions where, in the judgment of the Authority Having Jurisdiction, an adequate supply of water is provided to operate fixtures and equipment.
- The size and material of irrigation water piping installed outside of a building or structure and separated from the potable water supply by means of an approved air gap or backflow prevention device are not regulated by this code. The potable water piping system supplying each such irrigation system shall be adequately sized as required elsewhere in this chapter to deliver the full connected demand of both the domestic use and the irrigation systems.
|REQUIRED SIZE OF SOFTENER CONNECTION
|NUMBER OF BATHROOM GROUPS SERVED1|
|3/4||up to 22|
|1||up to 43|
For SI units: 1 inch = 25 mm
1 Installation of a kitchen sink and dishwasher, laundry tray, and automatic clothes washer permitted without additional size increase.
3 Over four bathroom groups, the softener size shall be engineered for the specific installation.