Takagi 910 Installation Manual And Owner's Manual - Natural Gas Supply Piping
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Natural Gas Supply Piping
Maximum Delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe Carrying Natural Gas of 0.60 Specific Gravity
Based on Pressure Drop of 0.5” WC
Based on Energy Content of 1,000 BTU/Cubic Ft.: 910 (T-M50) requires 380 Cubic Ft./hr. Unit: Cubic Feet per Hour
Pipe
Size
Length
Diameter
10'
20'
30'
40'
50'
60'
70'
80'
90'
100'
125'
150'
200'
¾”
363
249
200
171
152
138
127
118
111
104
93
84
72
1”
684
470
377
323
286
259
239
222
208
197
174
158
135
1 ¼”
1,404
965
775
663
588
532
490
456
428
404
358
324
278
1 ½”
2,103
1,445 1,161
993
880
798
734
683
641
605
536
486
416
2”
4,050
2,784 2,235 1,913 1,696 1,536 1,413 1,315 1,234 1,165 1,033
936
801
2 ½”
6,455
4,437 3,563 3,049 2,703 2,449 2,253 2,096 1,966 1,857 1,646 1,492 1,277
3”
11,412 7,843 6,299 5,391 4,778 4,329 3,983 3,705 3,476 3,284 2,910 2,637 2,257
Propane (LP) Gas Supply Piping
Maximum Capacity of Propane (LP) Gas Based on 11” WC supply pressure at a 1.0” WC pressure drop
Unit: kBTU per Hour
Pipe
Size
Length
Diameter
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’
125’
150’
200’
¾”
567
393
315
267
237
217
196
185
173
162
146
132
112
1”
1,071
732
590
504
448
409
378
346
322
307
275
252
213
1 ¼”
2,205 1,496 1,212 1,039
913
834
771
724
677
630
567
511
440
1 ½”
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023
976
866
787
675
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
10’ Length
3/4” Pipe Size
Gas Sizing Example
(Natural Gas)
15’ Length
1/2” Pipe Size
10’ Length
1/2” Pipe Size
Furnace
120,000BTU
10’ Length
1” Pipe Size
Water
Heater
380,000BTU
10’ Length
1-1/2” Pipe Size
Range
65,000BTU
20’ Length
1-1/4” Pipe Size
Dryer
35,000BTU
15’ Length
3/4” Pipe Size
10’ Length
1-1/2” Pipe Size
Gas Meter
B
A
Based on Energy Content of 1,000BTU/Cubic Ft:
Divide each appliance’s BTU requirement by 1,000BTU to get
the appliances Cubic Ft. requirement.
Take into account the distance the appliance is from the gas
meter, look in the above gas chart to properly size the line.
For sections of the gas line supplying gas to more than one
appliance (Ex: Point A to Point B), add up the cubic ft.
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 requirements and
dividing by 1,000 yields a cubic ft. requirement of 220 cubic ft. of
gas. The farthest appliance is the range, which is 60 ft. away
from the meter. Looking at the above chart, and under the
column of 60ft., Section A to B needs to be 1” in order to supply
220 cubic ft.