State Water Heaters 310C Installation Manual And Owner's Manual page 19

Maximum delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe carrying Natural Gas with 0.60 Specific Gravity
Based on Pressure Drop of 0.5" W.C.
Based on Energy Content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110C, 190
Cubic ft./hr for 310C, and 199 Cubic ft./hr for the 510C model.
Pipe Size
Diameter:
10' 20'
(3.0) (6.1)
in.
1/2"
172 118
3/4"
360 247
1" 678 466
1 1,309 957
1/4"
1 2,090 1,430 1,150 985
1/2"
2" 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020 928
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop
Pipe Size
10' 20'
Diameter
(3.0)
(6.1)
268 184
1/2"
3/4" 567 393
1,071 732
1"
2,205 1,496 1,212 1,039
1
1/4"
1 3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023
1/2"
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496 1,260
2"
Gas sizing example
(Natural Gas)
199,000 BTU/h
5' (1.5 m) Length
1-1/4" Pipe size
5' (1.5 m) Length
1-1/4" Pipe size
Gas meter
gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft. per hour requirements
of the appliances that are being supplied by that section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements
and dividing by 1,000 yields a cubic ft. per hour requirement of 220 cubic ft. of gas per hour. The farthest appliance
is the range, which is 50 ft. (15.2 m) away from the meter. According to the chart above, the 50-ft. (15.2 m) column
shows that Section A to B must be 1" in order to supply 220 cubic ft per hour.
-Natural Gas Supply Piping-
Length: ft. (m)
30' 40' 50' 60'
(9.1) (12.2) (15.2) (18.3)
95 81 72 65
199 170 151 137
374 320 284 257
768 657 583 528
873 791
-Propane (LP) Supply Piping-
Length: ft. (m)
30' 40' 50' 60'
(9.1) (12.2) (15.2) (18.3)
148 126 112 101
315 267 237 217
590 504 448 409
913 834
Water
heater
10' (3.1 m) Length
3/4" Pipe size
15' (4.6 m) Length
1" Pipe size
B
A
Length
10' (3.1 m)
1" Pipe size
10' (3.1 m) Length
3/4" Pipe size
Furnace
120,000 BTU/h
19
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Unit: Cubic feet per hour
70' 80' 90' 100'
(21.3) (24.4) (27.4) (30.5)
60 56 52 50
126 117 110 104
237 220 207 195
486 452 424 400
728 677 635 600
70' 80' 90' 100'
(21.3) (24.4) (27.4) (30.5)
93 87 82 77
196 185 173 162
378 346 322 307
771 724 677 630
976
Dryer
35,000 BTU/h
Length
10' (3.1 m)
1/2" Pipe size
15' (4.6 m) Length
1/2" Pipe size
C
Range
65,000 BTU/h
Page
Installation Manual
Installation
125' 150' 200'
(38.1) (45.7) (61.0)
44 40 34
92 83 71
173 157 134
355 322 275
532 482 412
794
Unit: kBTU per hour
125' 150' 200'
(38.1) (45.7) (61.0)
68 62 53
146 132 112
275 252 213
567 511 440
866 787 675
Based on Energy
Content of 1,000
BTU/Cubic ft:
Divide each
appliance's BTU/h
requirement by
1,000 BTU/ft to get
3
the appliances ft /h
3
requirement.
Take into account
the distance the
appliance is from
the gas meter, then
look in the above
gas chart to properly
size the line.
For sections of the