Takagi T-M50 - Manual (Page 17)

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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.