Lp (Liquid Propane) Gas Pipe Sizing; Gas Connection Requirements - Westinghouse WBRC**140F Manual

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 appliance. 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 15 – 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 16 – Liquid Propane Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas Code, Latest Edition
B. GAS CONNECTION REQUIREMENTS
1. a. On 140F models: The gas connection fitting on the appliance is ½" male NPT. A ½" X ¾" Bell Coupling has been provided with the
appliance to aid installation. NOTE: The pipe size must not be less than ½".
b. On 199F models: The gas connection fitting on the appliance is ¾" male NPT. NOTE: The pipe size must not be less than ¾".
2. The supply line must be sized for the maximum output of the appliance 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 appliance. Appliance 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 appliance. See Figure 17 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 connection on the appliance.
6. Test the gas pressure to make sure it meets the minimum standards and does not exceed the maximum standards of the appliance.
7. Leak test the gas line pipe before placing the appliance in operation. Only use approved leak detector liquid solutions to check for
leaks.
8. Do not operate the appliance until all connections have been completed and the heat exchanger is filled with water.
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
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
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-015 REV. 5.20.16
29
200
28
69
129
183
438
1050
200
67
140
265
543
814
1570