Mechanical Gas Fuel System G5.9, G8.3 – 005-999   Fuel System – Overview

Requirement

The fuel should be clean and must be free of acids, sulfur, halogen compounds, water, pipe scale and other foreign materials which could cause corrosion or abrasion of the cylinder liners, bearings and internal engine parts. Dry processed natural gas usually has the liquids removed and contains primarily methane and a small percent of ethane gases. This type of fuel generally has a lower heating value of 905 BTU/cu.ft and can be used in all Cummins natural gas engines that have been structured to run on “Dry Pipeline Natural Gas”. The operation of Cummins natural gas engines on HD-5 liquid propane or propane vapor and non-processed gas requires careful gas analysis of the fuel to decide the compression ratio selection. Check your local Cummins distributor for compression ratio and power rating for individual propane applications. Cummins natural gas engines are primarily specified to run on a good pipeline quality of dry processed natural gas. With the correct configuration, these engines can be adjusted to operate on digester gas or field gas. Engines that are operated on “landfill”
gas require that the gas be run through a scrubber to remove any sulfur and other corrosive compounds and a drier to remove any moisture. In addition, a high ash, multi-viscosity oil is required to reduce or eliminate contaminants that will enter into the engine lubricating oil from blow-by gases.

NOTE: All “Landfill” gas applications require factory approval.

CAUTION  Operators must always know the location of the manual gas shutoff valve. In cases of an emergency, the operator needs to shut off the fuel supply to the engine.

Each system is equipped with a Manual Gas Shutoff Valve. This valve, on a dry pipeline natural gas system, will generally be found upstream of the main line gas flow regulator and is normally supplied by the local gas utility. On propane systems this valve will be found at the propane supply tank and will be on the top of the tank for a propane vapor system and on the bottom of the tank for a propane liquid system.

General Information

SMALL | MEDIUM | LARGE

When installing capscrews on the exhaust flange, exhaust manifold, turbocharger, or the exhaust plug of any Industrial gas engine, apply a thin coat of anti-seize compound to the bolt threads and both faces of the washer.

Cummins Inc. recommends a Loctite® heavy-duty anti-seize lubricant or an equivalent product with a temperature resistance up to 2400°F [1315
°C].

Refer to Procedure 010-033 and Procedure 011-007 in Troubleshooting and Repair Manual, Generator Set QSK19G Engine Series, Bulletin 4021372, C8.3 Gas Base Engine Troubleshooting and Repair Manual, Bulletin 3666206, L10 Gas Base Engine Troubleshooting and Repair Manual, Bulletin 3666207, B5.9G, B5.9LPG, B Gas Plus, and B LPG Plus Base Engine Troubleshooting and Repair Manual, Bulletin 3666164, Generator Drive and Generator Set Control System QSK19G Series Engine Troubleshooting and Repair Manual, Bulletin 4021352, or Troubleshooting and Repair Manual Generator Set QSK45G and QSK60G Series Engines, Bulletin 4021396.