Size the gas pipe appropriately to supply the necessary volume of gas required
for the Hydro-Smart 170 (199,000 BTUH for both Natural Gas and 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 Hydro-Smart 170 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.: Hydro-Smart 170 requires 199 Cubic Ft./hr.
Unit: Cubic Feet per Hour
Pipe Size
Length in Feet
inches
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
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
C
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
Hydro
Smart 170
199,000BTU
5’ Length
1-1/4” Pipe Size
Range
65,000BTU
10’ Length
3/4” Pipe Size
Dryer
35,000BTU
15’ Length
1” 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.
Take into 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.
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