Takagi T-M50 Installation Manual And Owner's Manual page 17

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.
Pipe
Size
Diameter 10'
¾" 363
1" 684
1 ¼"
1,404
1 ½" 2,103
2" 4,050
2 ½" 6,455
3"
11,412
Maximum Capacity of Propane (LP) Gas Based on 11" WC supply pressure at a 1.0" WC pressure drop
Pipe
Size
Diameter 10' 20'
¾" 567 393
1" 1,071 732
1 ¼"
2,205 1,496
1 ½" 3,307 2,299
2" 6,221 4,331
Gas Sizing Example
Water
Heater
380,000BTU
20' Length
1-1/4" Pipe Size
10' Length
A
1-1/2" Pipe Size
10' Length
10' Length
1" Pipe Size
1-1/2" Pipe Size
Gas Meter
Natural Gas Supply Piping
20' 30' 40'
249 200 171
470 377 323
965 775 663
1,445 1,161 993
2,784 2,235 1,913 1,696 1,536 1,413 1,315 1,234 1,165 1,033
4,437 3,563 3,049 2,703 2,449 2,253 2,096 1,966 1,857 1,646 1,492 1,277
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
30' 40' 50'
315 267 237
590 504 448
1,212 1,039 913
1,858 1,559 1,417
3,465 2,992 2,646
(Natural Gas)
Dryer
35,000BTU
15' Length
B
3/4" Pipe Size
10' Length
3/4" Pipe Size
Range
Furnace
65,000BTU
120,000BTU
Length
50' 60' 70'
152 138 127 118
286 259 239 222
588 532 490 456
880 798 734 683
Length
60' 70' 80'
217 196 185
409 378 346
834 771 724
1,275 1,181 1,086
2,394 2,205 2,047
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.
10' Length
requirements of the appliances that are being supplied by that
1/2" Pipe Size
section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the
15' Length
furnace, range, and dryer. Adding up the BTU requirements and
1/2" Pipe Size
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.
- 17 -
Unit: Cubic Feet per Hour
80' 90' 100' 125'
111 104 93
208 197 174
428 404 358
641 605 536
Unit: kBTU per Hour
90' 100' 125'
173 162 146
322 307 275
677 630 567
1,023 976 866
1,921 1,811 1,606
150' 200'
84 72
158 135
324 278
486 416
936 801
150' 200'
132 112
252 213
511 440
787 675
1,496 1,260