§890.TABLE O. Water Supply Fixture Units (WSFU) for a Supply System with Flushometer Water Closets  


Latest version.
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    WSFU

    Demand (GPM)

    Pipe Size (Inches)

    Pressure Loss (PSI/100'

    of Pipe)

    Velocity (Ft./Sec.)

    Meter Size (Inches)

     

     

     

     

     

     

    10

    27

    1¼"

    8.3

    6.8

    ¾"

    12

    28.6

    1¼"

    9.2

    7.2

    ¾"

    14

    30.2

    1¼"

    10

    7.9

    ¾"

    16

    31.8

    1¼"

    11

    8.0

    ¾"

    20

    35

    1½"

    6.0

    6.4

    ¾"

    25

    38

    1½"

    7.0

    6.9

    1"

    30

    41

    1½"

    8.0

    7.4

    1"

    35

    43.8

    1½"

    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

    1½"

    60

    55

    2"

    3.4

    5.8

    1½"

    70

    58.5

    2"

    3.7

    6.0

    1½"

    80

    62

    2"

    4.0

    6.2

    1½"

    90

    64.8

    2"

    4.6

    6.5

    1½"

    100

    67.5

    2"

    5.0

    6.8

    1½"

    120

    72.5

    2"

    5.6

    7.2

    2"

    140

    77.5

    2"

    6.3

    8.0

    2"

    160

    82.5

    2½"

    2.7

    5.7

    2"

    180

    87

    2½"

    3.0

    6.1

    2"

    200

    91.5

    2½"

    3.4

    6.4

    2"

    225

    97

    2½"

    3.7

    6.8

    2"

    250

    101

    2½"

    4.0

    7.1

    3"

    275

    106

    2½"

    4.2

    7.3

    3"

    300

    110

    2½"

    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"

     

    Agency Notes:

     

    Where a unit of local government or the community public water supply does not require separate water service lines for irrigation or similar systems that are likely to impose continuous demands (e.g., lawn sprinkler or air conditioning systems), the following rule applies: estimate the continuous demand (in gallons per minute) for outlets/systems separately from the intermittent demand from the above fixtures, and add this amount to the demand of the fixtures (in gallons per minute).

     

    Meter and meter yoke sizes shown in this table shall apply only to those jurisdictions or governmental units where local ordinances or community public water supply requirements do not prescribe specific sizes of meters or meter yokes. Where local ordinances or community public water supply requirements cover such sizing, those requirements shall be followed.

     

    (Source:  Amended at 38 Ill. Reg. 9940, effective April 24, 2014)