Kohler Generator Sets 20--2800 kW User Manual download pdf (Page 46)

TP-5700 7/9334 Section 6 Fuel Systems

6.15 Natural Gas

Natural gas is in a vapor state as supplied from the utility.

This fuel system, therefore, consists of the same basic

components and is used in the same general sequence

as LP gas systems. When the heating content of the fuel

falls below 1000 BTU, as it does with manufactured

sewage and some natural gas fuels, the set will not

produce rated power.

The primary regulator may or may not be furnished by

the supplier. It is the responsibility of the supplier to

insure that sufficient pressure is present at all times to

operate the primary regulator. Installation, repair, and

alteration to gas piping should be undertaken only by the

supplier or with supplier’s permission. Piping should

never be used to ground any electrical apparatus. The

piping should be rigidly mounted but protected against

damage from vibration. Where flexible connections are

needed use only fuel line approved for gas fuels. See

Figure 6-10.

6.16 Combination Gas-Gasoline

Most engines, especially the smaller models, will

operate successfully on gas or gasoline without

extensive modification or complicated mechanical

changeover. With a combination gas-gasoline fuel

system, changeover involves only a few simple steps.

These systems normally utilize a gaseous fuel as the

primary fuel with gasoline for emergency operation. In

some areas natural gas is available at reduced cost on

an “interrupted service” basis. In some cases a

by-product gas is the primary fuel, but it may at times be

unavailable. Continued operation is assured under

these conditions by switching over to gasoline. The

changeover is done manually at the generator set.

Either a combination gas-gasoline carburetor or a

gasoline carburetor with a gas adapter is used. Natural

or LP gas can be used with these carburetor

combinations.

With the exception of the carburetor and addition of a

gas adapter, the combination gas-gasoline systems

utilize the same basic components as those in the

natural and LP gas systems. See Figure 6-11.

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Kohler Generator Sets 20--2800 kW User Manual Page 46