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Indiana Administrative Code (Last Updated: December 20, 2016) |
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Title 170. INDIANA UTILITY REGULATORY COMMISSION |
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Article 170IAC6. WATER UTILITIES |
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Rule 170IAC6-3. Central Station Hot Water Heating Utilities |
Section 170IAC6-3-11. Temperature standards
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Station Operating Schedule of Temperatures. (a) The standard for heating service shall be determined by the average temperature of the flow and return water in the mains at the heating plant of the utility and shall not be less than that indicated in the following table showing the average temperatures of flow and return.
(b) The average temperature of station flow and return water shall be determined by dividing by two the sum of the temperature of the water in the flow main and the temperature of the water in the return main.
TABLE I
Table Showing Average Temperatures of Flow and Return Water
Outside Temperature
Degrees Fahrenheit
Day Schedule
Permissible Night Schedules
6:00 a.m. to 6:00 p.m.
6:00 p.m. to 9:30 p.m.
3:30 a.m. to 6:00 a.m.
9:30 pm. to 3:30 a.m.
70
80
85
70
65
92
98
82
60
102
107
92
55
111
116
101
50
121
126
111
45
129
134
119
40
137
142
128
35
144
148
136
30
151
154
145
25
158
160
154
20
164
165
162
15
170
170
170
10
175
175
175
5
180
180
180
zero
184
184
184
-5
187
187
187
-10
190
190
190
-15
191
191
191
-20
192
192
192
NOTE.─See appendix [170 IAC 6-3-27] for schedule of station flow temperature.
TABLE II
Table Showing Temperature-Lowering Coefficients of Wind Movements
Outside Temperature
Temperature-Lowering Effect per Mile per Hour
50° to 40°
.75 degrees
40 to 30
1.00 degrees
30 to 20
1.10 degrees
20 to 10
1.20 degrees
10 to 0
1.30 degrees
0 to -10
1.40 degrees
-10 to -20
1.50 degrees
TABLE III
Table Showing Temperature-Lowering Effect of Wind
Outside Temperature
Light
5 to 10 m.p.h.
Wind
Medium
10 to 15 m.p.h.
Strong
15 to 20 m.p.h.
50° to 40°
6°
9°
13°
40 to 30
8
13
17
30 to 20
8
14
19
20 to 10
9
15
21
10 to 0
10
16
23
0 to -10
10
17
25
-10 to -20
11
19
26
NOTE.─The plant operator will vary these wind coefficients to suit local conditions.
(Indiana Utility Regulatory Commission; No. 17689: Standards of Service For Central Station Hot Water Heating Utilities Sec 11; filed Jan 2, 1946, 10:00 am: Rules and Regs. 1947, p. 1657; readopted filed Jul 11, 2001, 4:30 p.m.: 24 IR 4233; readopted filed Apr 24, 2007, 8:21 a.m.: 20070509-IR-170070147RFA; readopted filed Aug 2, 2013, 2:16 p.m.: 20130828-IR-170130227RFA)