Part 8 - Gas Connections; Gas Pipe Sizing Tables; Gas Pipe Sizing; Natural Gas Pipe Sizing - Westinghouse WGRGH20**75F Series Installation, Start-Up, Maintenance, Parts, Warranty

Part 8 - Gas Connections

To avoid serious injury or death, the gas line installation and the gas line inlet pressure test must be done by a licensed professional.
Ensure the gas on which the water heater will operate is the same type specified on the rating plate (natural gas or LP gas). This water heater
must be converted into propane operation unless specifically manufactured for use with propane. Follow LP Gas Conversion instructions
(this document). Propane ready water heaters have the suffix "LP" after the model serial number. Failure to follow these instructions could
result in property damage, personal injury, or death.
Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in poor performance and hazardous
operating conditions.
A manual gas control valve (shut-off valve) must be connected to the unit before the gas line.
Check the gas inlet pressure and make sure your gas meter is capable of supplying sufficient BTU load to all appliances. Insufficient gas
pressure and volume will cause your water heater to be deficient in performance and operation.
When connections are completed check for gas leaks by applying soapy water to all gas fittings and connections. Presence of soap bubbles
foaming is a sign of a gas leak.
This water heater and its individual shut-off valve must be isolated from the gas supply piping system by unplugging the unit and turning
off the main gas valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ PSI.
Failure to follow these instructions 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
3
Natural Gas is 1100 BTU/ft . Contact the local gas supplier for actual BTU/ft
or local codes.
• When measuring the inlet supply pressure, the water heater and all other gas appliances sharing the gas supply line must be firing at
maximum capacity.
• Maximum gas pressure must not exceed listed value.
• Low gas pressure could be caused by an undersized gas pipe. This will cause the water heater's performance to diminish, limiting the
ability to reach maximum performance.
NOTE: DO NOT USE 1/2" quick flex gas lines! Doing so will result in improper appliance operation.

2. Natural Gas Pipe Sizing

The following tables list maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 11" or less and a pressure drop of 0.5
inches water column, based on a 0.60 specific gravity for natural gas.
Pipe Size (in.)
10
1/2
82
3/4 192
1 383
1 1/4 639
1 1/2
1260
2
2930
Table 19 - Natural Gas Delivery Capacity - Corrugated Stainless Steel Pipe - Refer to ANSI Z223.1 - National Fuel Gas Code, Latest Edition
Pipe Size (in.)
10
1/2 172
3/4 360
1 678
1 1/4
1390
1 1/2
2090
2
4020
Table 20 - 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 inches water column and specific pressure drop
of 0.5 inches water column based on 1.5 specific gravity for liquid propane.
FIRE AND/OR EXPLOSION HAZARD
Length of Pipe (Feet)
20 30 40
58 47 41
137 112 97
269 218 188
456 374 325
888 723 625
2080 1700 1470
Length of Pipe (Feet)
20 30 40
118 95 81
247 199 170
466 374 320
957 768 657
1430 1150 985
2760 2220 1900
3
rating. Size gas piping system by following ANSI Z223.1/NFPA 54
50 60 80
37 37 29
87 80 69
168 153 132
292 267 232
559 509 440
1320 1200 1040
50 60 80
72 65 56
151 137 117
284 257 220
583 528 452
873 791 677
1680 1520 1300
100 150 200
26 20 18 Hour x 1,000
62 48 44
(0.60 Specific
118 91 82
208 171 148
Pressure Drop)
393 320 277
933 762 661
100 150 200
50 40 34
Hour x 1,000
104 83 71
(0.60 Specific
195 157 134
400 322 275
Pressure Drop)
600 482 412
1160 928 794
whl-605 Rev. 002 Rel. 000 Date 1.23.19
37
BTU's Per
Gravity,
0.5 WC
BTU's Per
Gravity,
0.5 WC