Part 7 - Gas Piping; Gas Pipe Sizing Tables; Gas Pipe Sizing; Natural Gas Pipe Sizing - Westinghouse WBRCNG140W Installation Manual

If using a condensate pump, select one approved for use with condensing boilers and furnaces. The pump should have an overflow
switch to prevent property damage from condensate spillage.
It is very important that the condensate piping be no smaller than ¾". To prevent sagging and maintain pitch, condensate piping should
be supported with pipe supports, and pitched ¼" per foot to allow for proper drainage.
The condensate line must remain unobstructed, allowing free flow of condensate. If condensate freezes in the line, or if line is
obstructed in any other manner, condensate can exit from the tee, resulting in potential water damage to property.
PART 7 – GAS PIPING
To avoid serious injury or death, the gas line installation and the gas line inlet pressure test must be done by a licensed professional.
Always match the appliance with the type of gas supplied to the unit (natural gas or LP gas). Propane ready appliances have the suffix
"LP" after the model serial number.
Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in poor performance and
hazardous operating conditions.
Failure to ensure the appliance is set to operate on the provided gas supply could result in property damage, personal injury, or death.
A. GAS PIPE SIZING TABLES

1. Gas Pipe Sizing

This information is for reference use only. Refer to gas pipe manufacturer specifications for actual delivery capacity. The DOE standard
for Natural Gas is 1100 BTU/ft

2. Natural Gas Pipe Sizing

The following tables list maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 0.5 psi or less and a pressure drop
of 0.5 inches water column, based on a 0.60 specific gravity for natural gas.
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
FIRE AND/OR EXPLOSION HAZARD
3
. Contact the local gas supplier for actual BTU/ft
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30
58 47
137 112
269 218
456 374
888 723
2080 1700
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
20 30
118 95
247 199
466 374
957 768
1430 1150
2760 2220
3
rating.
40 50
41 37
97 87
188 168 153
325 292 267
625 559 509
1470 1320 1200
40 50 60
81 72 65
170 151 137
320 284 257
657 583 528
985 873 791
1900 1680 1520
60 80 100
37 29 26
80 69 62
132 118
232 208
440 393
1040 933
80 100
56 50
117 104
220 195
452 400
677 600
1300 1160
WHL-012 REV. 12.17.14
27
150 200
20 18
48 44
91 82
171 148
320 277
762 661
150 200
40 34
83 71
157 134
322 275
482 412
928 794