Fuel Requirements & Pipe Sizing - Generac Power Systems PowerPact 6561 Installation Notes

Gaseous Fuel Requirements and Installation
Page 16 thru 21 in the Installation Guidelines Air-cooled Generators

Most Generators using gaseous fuels have a higher kW rating on Propane vs Natural Gas.

Generac Guardian Series Air-Cooled (Evolution) generators require 3.5 to 7" of water column for
Natural Gas, and 10 - 12" Water column for Liquid Propane Vapor.

For NatGas, verify that the meter is capable of providing enough fuel flow to include all household
appliances and other loads.

Order New Gas Meter from the Utility if it needs to be upsized (Customer may have to place the
order)
LP Gas Requirements
 With LP Gas, use only the vapor withdrawal system. This type of system uses the vapors formed
above the liquid fuel in the storage tank.
 The minimum LP tank size is 250 gallons unless unit calculations dictate the use of a larger tank.
 Vertical tanks which are measured in pounds will not usually meet the minimum requirements. A
1050LB vertical tank size is minimum required.
This section can be found in:
Page 7 thru 9 in the Generac Generator Sizing Guide
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