Natural Gas Pipe Sizing; Lp Vapor Pipe Sizing; Gas Installation Summary; Important - Generac 20 kW Synergy Guia De Instalacion

When measuring pipe length, add 2.5 feet (0.76m) for each angle or bend in the pipe run and add that to the
4.
overall pipe distance.
5.4.1— Natural Gas Pipe Sizing
The following table indicates the maximum length (measured in feet / meters) allowed for various pipe sizes. The pipe
sizes are measured by inside diameter (ID) to include any fittings, valves (must be full flow), elbows, tees or angles.
Add 2.5 feet (0.76 m) to the overall distance for each bend, tee or angle in the pipe run.
NOTE: Tables based on Schedule 40 black pipe.
Allowable Pipe Distances (feet / meters)
Pipe Size
(in. / mm)
20 kW Synergy
For 5-7 inches of water column (9-13 mm of mercury).
Allowable Pipe Distances (feet / meters)
Pipe Size
(in. / mm)
20 kW Synergy
For pressures below 5 inches of water column (9 mm of mercury)
down to 3.5 inches of water column (7 mm of mercury).
5.4.2— LP Vapor Pipe Sizing
The table indicates the maximum length (measured in feet / meters) allowed for various pipe sizes. The pipe sizes are
measured by inside diameter (ID) to include any fittings, valves (must be full flow), elbows, tees or angles. Add 2.5 feet
(0.76 m) to the overall distance for each bend, tee or angle in the pipe run.
NOTE: Pipe sizes are using a second stage regulator.
Allowable Pipe Distances (feet / meters)
20 kW Synergy
5.4.3— Gas Installation Summary
Mistakes frequently occur when sizing gas pipe. A properly sized gas pipe is critical to the proper operation of the gen-
erator. The generator inlet size has no bearing on the proper gas pipe size. If using a piping method other than black
pipe, refer to local codes and the pipe manufacturer's specifications for sizing and installation information.
IMPORTANT: Size the gas supply and pipe at 100% Load BTU / megajoule rating.
Installation Guidelines for Air-Cooled Generators
1 / 25 1.25 / 32
20 / 6.1 130 / 39.62
1 / 25
10 / 3.05
Pipe Size
1 / 25
(in. / mm)
115 / 35.05
1.5 / 38
305 / 92.96
1.25 / 32 1.5 / 38
60 / 18.29 125 / 38.1
1.25 / 32
480 / 146.3
Fuel Conversion/Gas Connections
2 / 51
945 / 288.04
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