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Size the gas pipe appropriately to supply the necessary volume of gas required
for the T-M50 (380,000 BTU/H for Natural Gas or 380,000 BTU/H for Liquid
Propane) using ANSI233.1/NAPA 54 in the USA or CAN/CSA B149.1 in Canada
or local codes. Otherwise, flow capabilities and output temperatures will be
limited.
1.
Install a manual gas shut-off valve between the T-M50 and the gas supply line.
2.
When the gas connections are completed, it is necessary to perform a gas leak test either
by applying soapy water to all gas fittings and observing for bubbles or by using a gas leak
detection device.
3.
Always purge the gas line of any debris and/or water before connecting to the gas inlet.
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 1000 BTU/Cubic Ft.: T-M50 requires 380 Cubic Ft./hr. Unit: Cubic Feet per Hour
Length of Pipe
Pipe
Size
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”
1404 965 775 663
588
532
490
456
428 404 358
324
278
1 ½”
2103 1445 1161 993
880
798
734
683
641 605 536
486
416
2”
4050 2784 2235 1913
1696
1536
1413
1315
1234 1165 1033
936
801
2 ½”
6455 4437 3563 3049
2703
2449
2253
2096
1966 1857 1646
1492
1277
3”
11412 7843 6299 5391
4778
4329
3983
3705
3476 3284 2910
2637
2257
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 in Feet
inches
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”
1071 732 590 504
448
409
378
346
322 307 275
252
213
1 ¼”
2205
1496
1212
1039
913
834
771
724
677 630 567
511
440
1 ½”
3307 2299 1858 1559
1417
1275
1181
1086
1023 976 866
787
675
2”
6221 4331 3465 2992
2646
2394
2205
2047
1921 1811 1606
1496
1260
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
T-M50
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 1000BTU/Cubic Ft:
Divide each appliance’s BTU requirement by 1000BTU to get
the appliances Cubic Ft. requirement.
Takagi 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 1000 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.
