Takagi T-M32 - Manual (Page 16)

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Size the gas pipe appropriately to supply the necessary volume of gas required
for the T-M32 (240,000 BTU/H for Natural Gas or 240,000 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-M32 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-M32 requires 240 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-M32
240,000BTU
5’ Length
1-1/4” Pipe Size
Range
65,000BTU
10’ Length
3/4” Pipe Size
Dryer
35,000BTU
15’ Length
3/4” Pipe Size
5’ Length
1-1/4” 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 50 ft. away
from the meter. Looking at the above chart, and under the
column of 50ft., Section A to B needs to be 1” in order to supply
220 cubic ft.