Water Service Line - Sizing

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WATER SERVICE LINE - SIZING

TO CALCULATE SIZE OF WATER SERVICE LINEThe water service supply line delivers potable water to your home from the city water main. Thewater service line for a residential home is typically a to 1 pipe that can be seen entering your

building near the water meter. If you are proposing to add plumbing fixtures such as a new shower,new sink, new toilet or similar, it is required by the Illinois Plumbing Code that the water servicesupply line is large enough to accommodate the capacity of water that is demanded from all of yourplumbing fixtures combined as established in TABLE N (Flush Tank) or TABLE O (Flushometer)of the Illinois Plumbing Code. At an existing residence several conditions can affect the capacity ofthe water service line including pipe size, length of water service line and condition of the pipe. Todetermine if the existing water service supply line is adequately sized you will need three pieces ofinformation:

1. TABLE A - Water Service Line-Sizing Worksheet is attached and allows you to calculatethe number of existing and proposed plumbing fixtures within your home as well as any

possible future plumbing fixtures. For each fixture there is a corresponding Water SupplyFixture Unit (WSFU). The worksheet will allow you to calculate the total WSFUs by

multiplying in each row the number of fixtures by the WSFUs and then adding all the WSFUsin the right hand column. The total will then be compared to TABLE N or TABLE O.

2. TABLE N or TABLE O which is also attached is from the Illinois Plumbing Code andidentifies the minimum water service line or pipe size (third column) based on the totalnumber of WSFUs calculated from TABLE A. Please Note: TABLE N should be referenced if

toilets are tank type and TABLE O should be referenced if toilets are flushometer type.

3. PIPE SIZEof the existing water service line to your home is best determined by measuring the

pipe where it enters the building. You may also call the Wheaton Water Division at 630-260-2090, who may be able to confirm the size of the existing water service line.

If the proposed addition of plumbing fixtures to an existing residence results in more fixtures thansupported by the water service as determined by TABLE N/O the capacity of the water service lineis undersized and does not comply with Illinois Code. Please forward TABLE A to the WheatonBuilding Department and staff will forward to the Water Division to confirm if the existing waterservice line is in compliance with Illinois Code.

OPTIONS IF WATER SERVICE LINE IS UNDERSIZED

Option 1 Replacement. If the proposed addition of plumbing fixtures to an existing residenceresults in more fixtures than supported by the water service line, the line shall be replaced from theCity water main to the meter. Prior to commencing the installation of any new, repair orreplacement of any existing water service line a permit is required to be issued by the WheatonBuilding Department, see handout titled Water Service LineNew, Repair, Disconnect; or

Option 2 Pressure Test. If the proposed addition of plumbing fixtures to an existing residenceresults in more fixtures than supported by the water service line the capacity of the water service linecan be evaluated by an alternate method and that is by having your plumber perform a pressure test.The pressure test may have been stipulated when the Building Department issued the building permit

City of Wheaton Building and Code Enforcement


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CITY OF WHEATON BUILDING AND CODE ENFORCEMENT

Water Service Line - Sizing

Rev. 1/18/11

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to you. Section 890.1210c of the Plumbing Code requires a minimum constant water pressure on thedischarge side of the water meter to be at least 20 p.s.i. The water distribution system must beadequately sized to provide a minimum constant water pressure at each fixture of at least 8 p.s.i. Thepressure test is conducted after installation of the additional fixtures, and must be conducted by aregistered plumbing contractor and witnessed by the Citys registered plumbing inspector.

The pressure test shall be conducted as follows:

1. Notify the Building Department at least one day in advance that you will be performing apressure test with your Plumbing Contractor and pay $40.00 to have the City PlumbingInspector witness the pressure test. Pressure tests are typically scheduled on each Tuesdayat approximately 9:00a.m. Pressure tests shall be performed no sooner than after theplumbing rough inspection and can be done on the same day as the final plumbinginspection.

2. On the day of the pressure test: locate all water outlets and toilets in the house.

3. Find the sill cock or drain cock located closest to the water meter and attach the pressuregauge. Open the sill cock fully and record the static pressure.

4. Turn on all plumbing fixtures, both hot and cold. Start in the basement, if applicable, andwork up to the top floor. Do not open other sill cocks or yard hydrant.

5. Flush all toilets and record the residual pressure while the toilets are still filling.

If the pressure falls below 20 p.s.i., the water service must be replaced, see Option 1 above.

If the pressure test finds that the water pressure at the water service entrance is maintained at no less

than the 20 p.s.i. at peak demand the water service line size complies with State Plumbing Code anddoes not need to be replaced. Money that was collected by the City for the installation of theproposed new water service line may be eligible for a refund. These fees may include costs for alarger water meter, inspection fees, cost for replacement of a water service line from main to B-box,restoration bonds and others. To initiate a refund send a copy of the inspection report that indicatesthe pressure at the water meter exceeds the required State Plumbing Code pressure to the WaterDivision. The Water Division will review your request, identify all fees that can be refunded andwill then forward the information to the Building Department for processing of the refund.


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TABLE A WATER SERVICE LINE SIZING WORKSHEET

Address:_______________________________________ Date: ______________

TABLE A allows you to calculate the number of Water Service Fixture Units for any existing and proposedplumbing fixtures within your homethat is associated to any proposed addition or remodeling.

Where existing fixtures are only being replaced with no other work involved, the fixture is to be included onlyas existing, do not add these fixtures as proposed. If your plans depict future fixtures, they are to beincluded as proposed fixtures to ensure that the water service line is properly sized.

** PLEASE NOTE: If this worksheet is to be used for Commercial projectsCommercial Load Values

must be provided.

EXISTING FIXTURES Load Values No. of fixtures WSFU Count

Kitchen sink 2

Dishwasher 1

Washing Machine 2

Laundry Tub 3

Toilet with flush tank (refer to Table N) 3

Toilet with flush valve (refer to Table O) 6

Bathtub/shower 2

Shower stall 2

Lavatory (sinks) 1

Subtotal

PROPOSED FIXTURES Load Values No. of fixtures WSFU Count

Kitchen sink 2

Dishwasher 1

Washing Machine 2

Laundry Tub 3

Toilet with flush tank (refer to Table N) 3

Toilet with flush valve (refer to Table O) 6

Bathtub/shower 2

Shower stall 2

Lavatory (sinks) 1

Subtotal

TOTAL Water Service Fixture Unit Count for existing and proposed fixtures


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Rev. 1/18/11

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TABLE N Flush Tank

TITLE 77: PUBLIC HEALTH

PART 890 ILLINOIS PLUMBING CODE

SECTION 890.APPENDIX A PLUMBING MATERIALS, EQUIPMENT, USE RESTRICTIONS AND APPLICABLE

STANDARDS

Section 890.APPENDIX A Plumbing Materials, Equipment, Use Restrictions and Applicable StandardsSection 890.TABLE N Water Service Line-Sizing for a Supply System with Flush Tank.

W.S.F.U. Demand (GPM)Pipe Size(Inches)

Pressure Loss

(PSI/100'

of Pipe)

Velocity(Ft./Sec.)

Meter Size(Inches)

2 2 " 4.2 2.7 "

4 3 " 8.7 4.2 "

6 5 " 22.5 7.0 "

8 6.5 " 6.3 4.3 "

10 8 " 9.0 5.4 "

12 9.2 " 11.5 6.1 "

14 10.4 " 15.0 6.9 "

16 11.6 " 18.0 7.7 "20 14 1" 7.2 5.6 "

25 17 1" 10.0 6.6 "

30 20 1" 13.6 8.0 1"

35 22.5 1" 5.8 5.7 1"

40 25 1" 7.0 6.3 1"

45 27 1" 8.2 6.9 1"

50 29 1" 9.5 7.4 1"

60 32 1" 5.0 5.8 1"

70 35 1" 6.2 6.4 1"

80 38 1" 7.0 7.2 1"

90 41 1" 8.0 7.5 1"

100 43.5 1" 8.7 7.8 2"

120 48 2" 2.7 5.0 2"

140 52.5 2" 3.1 5.4 2"

160 57 2" 3.6 5.8 2"

180 61 2" 3.9 6.1 2"

200 65 2" 4.5 6.6 2"

225 70 2" 5.2 7.1 2"

250 75 2" 6.0 7.7 3"

275 80 2" 2.6 5.5 3"

300 85 2" 2.9 5.8 3"

350 95 2" 3.5 6.5 3"

400 105 2" 4.2 7.1 3"

450 115 2" 5.0 8.0 3"

500 125 3" 2.3 5.9 3"600 145 3" 3.1 6.8 4"

750 170 3" 4.0 8.0 4"

1000 208 4" 1.5 5.7 4"

1250 240 4" 1.9 6.4 4"

1500 267 4" 2.3 7.0 4"

1750 294 4" 2.8 7.8 4"

2000 320 6" 0.36 3.7 6"


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Rev. 1/18/11

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TABLE O - Flushometer

TITLE 77: PUBLIC HEALTH

PART 890 ILLINOIS PLUMBING CODE

SECTION 890.APPENDIX A PLUMBING MATERIALS, EQUIPMENT, USE RESTRICTIONS AND

APPLICABLE STANDARDS

Section 890.APPENDIX A Plumbing Materials, Equipment, Use Restrictions and Applicable StandardsSection 890.TABLE O Water Supply Fixture Units (W.S.F.U.) for a Supply System with Flushometers.

W.S.F.U.Demand

(GPM)

Pipe Size

(Inches)

Pressure Loss

(PSI/100'

of Pipe)

Velocity (Ft.

/Sec.)

Meter Size

(Inches)

10 27 1" 8.3 6.8 "

12 28.6 1" 9.2 7.2 "

14 30.2 1" 10 7.9 "

16 31.8 1" 11 8.0 "

20 35 1" 6.0 6.4 "25 38 1" 7.0 6.9 1"

30 41 1" 8.0 7.4 1"

35 43.8 1" 8.8 8.0 1"

40 46.5 2" 2.5 4.7 1"

45 49 2" 2.7 5.1 1"

50 51.5 2" 2.9 5.4 1"

60 55 2" 3.4 5.8 1"

70 58.5 2" 3.7 6.0 1"

80 62 2" 4.0 6.2 1"

90 64.8 2" 4.6 6.5 1"

100 67.5 2" 5.0 6.8 1"

120 72.5 2" 5.6 7.2 2"140 77.5 2" 6.3 8.0 2"

160 82.5 2" 2.7 5.7 2"

180 87 2" 3.0 6.1 2"

200 91.5 2" 3.4 6.4 2"

225 97 2" 3.7 6.8 2"

250 101 2" 4.0 7.1 3"

275 106 2" 4.2 7.3 3"

300 110 2" 4.6 7.6 3"

350 119 3" 2.1 5.5 3"

400 126 3" 2.3 5.9 3"

450 138 3" 2.7 6.3 3"

500 145 3" 3.0 6.8 3"600 160 3" 3.6 7.4 4"

750 178 4" 1.1 4.7 4"

1000 208 4" 1.5 5.6 4"

1250 240 4" 1.9 6.4 4"

1500 267 4" 2.3 7.0 4"

1750 294 4" 2.8 7.8 4"

2000 321 6" 0.4 3.7 6"

Water Service Line - Sizing

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