Lp (Liquid Propane) Gas Pipe Sizing; Gas Connection Requirements - Westinghouse WGRT 150 Series Installation Start-Up Maintenance Parts

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
2 ½"
6400
3"
11300
4"
23100
Table 16 – 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 14" 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 17 – 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 18 – 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 19 for detail.
5. To facilitate any future maintenance, it is also recommended that an approved gas union fitting be installed in the supply line between
the shut-off valve and the ¾" female NPT connection on the water heater.
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
4400 3530 3020
7780 6250 5350
15900 12700 10900
Cubic Feet per Hour (1.5 Specific Gravity, 0.5 WC Pressure Drop)
20 30
91 74
216 177
425 344
661 528
1400 1140
3290 2680 2330
Cubic Feet per Hour (1.5 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
50 60
72 65
151 137
284 257
583 528
873 791
1680 1520
2680 2430
4740 4290
9660 8760
40 50 60
64 58 53
153 137 126
297 265 241
449 397 359
988 884 805
2080 1900
50 60
122 110
255 231
480 434
985 892
1480 1340
2840 2570
80 100 150
56 50 40
117 104 83
220 195 157
452 400 322
677 600 482
1300 1160 928
2080 1840 1480
3670 3260 2610
7490 6640 5330
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. 5.26.17
34
200
34
71
134
275
412
794
1270
2240
4560
200
28
69
129
183
438
1050
200
67
140
265
543
814
1570