Kohler Generator Sets 20--2800 kW User Manual download pdf (Page 44)

TP-5700 7/9332 Section 6 Fuel Systems

6.8 Flexible Connector

An approved flexible connector should always be used

between stationary gas piping and the engine-mounted

fuel system components. It should be at least six inches

(15.3 cm) long or as recommended by the generator

supplier based upon engine specifications.

6.9 Gas Piping

Gas piping s hould be Schedule 40 black iron pipe.

Copper tubing may be used if the fuel does not contain

hydrogen sulfide or other ingredients which will react

chemically with copper. Fuel piping should never be

used to ground electrical equipment. Piping should be

sized according to the requirements of the equipment to

be operated. Refer to the dimensional drawing for

detailed information on your unit. In addition to the

actual fuel consumption, the following factors must be

considered:

D Pressure loss due to length of pipe

D Pressure loss due to other appliances on the same

fuel supply

D Pressure loss due to number of fittings

6.10 Fuel Regulators

Fuel regulators are compatible with both natural gas and

LP gas. When used with natural gas the spring and

retainer are installed. The spring and retainer are

usually removed from the fuel regulator when used with

LP gas. Refer to the appropriate generator set

operation manual and/or decal on the unit for specific

information regarding spring/retainer usage.

Gas fuels may require the fuel regulator to be mounted

in a given position. The fuel regulator will function

properly with the fuel regulator pointing downward for

both natural gas and LP gas. The fuel regulator may be

positioned so that it is pointing upward for use with

natural gas only.

Two regulators are used in the typical gaseous fuel

system:

D Primary Regulator—This regulator provides initial

control of the gas from the fuel supply. The primary

regulator reduces line pressures to allowable inlet

pressures for the secondary regulators on the

system. This regulator would drop high pressure

from a tank or transmission line to a low pressure,

typically 4-6 ounces per square inch (1.7-2.6 kPa)

or 7-11 inches (178-279 mm) of water column. This

regulator is not usually supplied with the generator

set, as conditions that dictate the type used vary

depending on the method in which the fuel is

supplied.

D Secondary Regulator—This low-pressure type

regulator is mounted on the engine and is designed

for a maximum inlet pressure of six ounces per

square inch (2.6 kPa) or 11 inches (279 mm) of

water column. The engine will operate

satisfactorily at four ounces per square inch

(1.7 kPa) or 7 inches (179 mm) of water column or

less, but lower pressures may result in poor

response to load changes or lack of power where

the primary regulator is not near the engine.

Although regulators are designed to close and shut off

fuel when the engine stops, a solenoid valve should be

located ahead of the regulator and the flexible fuel

connector to prevent the accumulation of an explosive

mixture of gas and air, should either the flexible

connection or regulator develop a leak. The generator

set installer normally wires the solenoid valve to the

engine starting controls so it will open (with battery

power) when the engine cranks or runs.

Some fuel regulators have provisions to install a

pressure gauge to test inlet and outlet pressures. If none

are available, install pipe tees in the fuel line to serve this

purpose and use pipe plugs on any unused openings.

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Kohler Generator Sets 20--2800 kW User Manual Page 44

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