Install Instructions

19 Page
-Natural Gas Supply Piping-
Maximum delivery capacity of cubic feet of gas per hour of IPS pipe carrying Natural Gas with 0.60 specific gravity
based on pressure drop of 0.5" W.C.
Based on energy content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110U (T-KJr2U)
model, 190 Cubic ft./hr for the 310U (T-K4U) model, and 199 Cubic ft./hr for the 510U (T-D2U) model.
Based on Energy Content of 1,000 BTU/Cubic ft:
Divide each appliance's BTU/h requirement by 1,000 BTU/ft
3
to get the appliances ft
3
/h 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. per hour 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/h
requirements and dividing by 1,000 yields a cubic ft. per hour requirement of 220 cubic ft. of gas per hour. The
farthest appliance is the range, which is 50 ft. away from the meter. Looking at the above chart, and under
the column of 50 ft., Section A to B needs to be 1" in order to supply 220 cubic ft.
Water
heater
199,000 BTU/h
Dryer
35,000 BTU/h
Gas meter
Furnace
120,000 BTU/h
Range
65,000 BTU/h
A
B
C
10' Length
1/2" Pipe size
15' Length
1/2" Pipe size
15' Length
1" Pipe size
10' Length
3/4" Pipe size
10' Length
1" Pipe size
5' Length
1-1/4" Pipe size
10' Length
3/4" Pipe size
5' Length
1-1/4" Pipe size
Gas sizing example
(Natural Gas)
Installaon
Installaon Manual
Pipe Size
Length
Diameter
10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125' 150' 200'
3/4"
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
1/4"
1,404 965 775 663 588 532 490 456 428 404 358 324 278
1
1/2"
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
Unit: Cubic feet per hour