77 Ill. Adm. Code 890.APPENDIX A
A Plumbing Materials, Equipment, Use Restrictions and Applicable Standards
Section 890
Section 890.APPENDIX A
Plumbing Materials, Equipment, Use Restrictions and Applicable Standards
Section 890.TABLE N Water
Supply Fixture Units (WSFU) for a Supply System with Flush Tanks
Water
Closets
WSFU
Demand
(GPM)
Pipe Size
(Inches)
Pressure
Loss
(PSI/100'
of Pipe)
Velocity
(Ft./Sec.)
Meter Size
(Inches)
2
2
½"
4.2
2.7
⅝"
4
3
½"
8.7
4.2
⅝"
6
5
½"
22.5
7.0
⅝"
8
6.5
¾"
6.3
4.3
⅝"
10
8
¾"
9.0
5.4
¾"
12
9.2
¾"
11.5
6.1
¾"
14
10.4
¾"
15.0
6.9
¾"
16
11.6
¾"
18.0
7.7
¾"
20
14
1"
7.2
5.6
¾"
25
17
1"
10.0
6.6
¾"
30
20
1"
13.6
8.0
1"
35
22.5
1¼"
5.8
5.7
1"
40
25
1¼"
7.0
6.3
1"
45
27
1¼"
8.2
6.9
1"
50
29
1¼"
9.5
7.4
1"
60
32
1½"
5.0
5.8
1½"
70
35
1½"
6.2
6.4
1½"
80
38
1½"
7.0
7.2
1½"
90
41
1½"
8.0
7.5
1½"
100
43.5
1½"
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
2½"
2.6
5.5
3"
300
85
2½"
2.9
5.8
3"
350
95
2½"
3.5
6.5
3"
400
105
2½"
4.2
7.1
3"
450
115
2½"
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"
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 sizing,
those requirements shall be followed.