Lp (Liquid Propane) Gas Pipe Sizing; Gas Connection Requirements - Westinghouse WGRTNG199 Nstallation & Maintenance Manual

Maximum Natural Gas Delivery Capacity – Length of Corrugated Stainless Steel Pipe in Feet
Pipe Size
10
½"
82
¾"
192
1"
383
1 ¼"
639
1 ½"
1260
2"
2930
Table 11 – Natural Gas Delivery Capacity – Corrugated Stainless Steel Pipe – Refer to ANSI Z223.1 – National Fuel Gas Code,
Latest Edition
Maximum Natural Gas Delivery Capacity – Length of Black Iron Pipe (Sch. 40 Metallic) in Feet
Pipe Size
10
½"
172
¾"
360
1"
678
1 ¼"
1390
1 ½"
2090
2"
4020
Table 12 – Natural Gas Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas Code, Latest Edition

3. LP (Liquid Propane) Gas Pipe Sizing

The following is intended for use for piping between a Single or Second Stage (Low Pressure) Regulator and the water heater. The
following tables list maximum capacity of pipe in cubic feet of gas per hour for an inlet pressure of 11 inches water column and specific
pressure drop of 0.5 inches water column based on 1.5 specific gravity for liquid propane.
Maximum Liquid Propane Delivery Capacity – Length of Corrugated Stainless Steel Pipe in Feet
Pipe Size
10
½"
129
¾"
303
1"
605
1 ¼"
971
1 ½"
1990
2"
4640
Table 13 – Liquid Propane Delivery Capacity – Corrugated Stainless Steel Pipe – Refer to ANSI Z223.1 – National Fuel Gas
Code, Latest Edition
Maximum Liquid Propane Delivery Capacity – Length of Black Iron Pipe (Sch. 40 Metallic) in Feet
Pipe Size
10
½"
291
¾"
608
1"
1150
1 ¼"
2350
1 ½"
3520
2"
6790
Table 14 – Liquid Propane Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas Code, Latest Edition
B. GAS CONNECTION REQUIREMENTS
1. The gas connection fitting on the water heater is ¾" female NPT. NOTE: The pipe size must not be less than ¾".
2. The supply line must be sized for the maximum output of the water heater being installed. If there are additional gas appliances from
the main supply line, measure the size of the supply line according to the COMBINED total maximum BTUH draw for the appliances as
if they were operating at the same time.
3. Measure the length of the gas supply line from the gas meter to the water heater. Water heater must be installed downstream of the
gas meter to ensure adequate gas supply. Use the tables in this manual or refer to the gas line manufacturer's sizing information to
determine the correct supply pipe size.
4. A manual gas shut-off valve should be installed in the gas supply line close to the water heater. See Figure 12 for detail.
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30
58 47
137 112
269 218 188
456 374 325
888 723 625
2080 1700 1470
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30 40
118 95 81
247 199 170
466 374 320
957 768 657
1430 1150 985
2760 2220 1900
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30
91 74
216 177 153
425 344 297
661 528 449
1400 1140 988
3290 2680 2330
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30 40
200 160 137
418 336 287
787 632 541
1620 1300 1110
2420 1940 1660
4660 3750 3210
40 50 60
41 37 37
97 87 80
168 153
292 267
559 509
1320 1200
50 60
72 65
151 137
284 257
583 528
873 791
1680 1520
40 50 60
64 58 53
137 126
265 241
397 359
884 805
2080 1900
50 60
122 110
255 231
480 434
985 892
1480 1340
2840 2570
80 100 150
29 26 20
69 62 48
132 118 91
232 208 171
440 393 320
1040 933 762
80 100 150
56 50 40
117 104 83
220 195 157
452 400 322
677 600 482
1300 1160 928
80 100 150
45 41 31
109 98 75
208 186 143
307 270 217
696 621 506
1650 1480 1210
80 100 150
101 94 84
212 197 175
400 372 330
821 763 677
1230 1140 1010
2370 2200 1950
WHL-004 REV. 12.17.14
22
200
18
44
82
148
277
661
200
34
71
134
275
412
794
200
28
69
129
183
438
1050
200
67
140
265
543
814
1570