COVER 5M5445 - Caterpillar

EngineG3512E (S/N: GFM1-UP; SSR1-UP; NGS1-UP)G3516H (S/N: GLM1-UP; GLN1-UP)G3520H (S/N: GFP1-UP; GFR1-UP)Introduction
Gas Trains are now available for the above Gas Engine Generator Sets. This Special Instruction provides the necessary information to install and maintain these gas train systems. All gas trains discussed in this document are designed to utilize dry pipeline quality natural gas to the below specifications. Consult the factory for applications using other fuels
Table 1
Component Specification
Maximum Design Inlet Pressure 48 kPa (7 psi)
Minimum Inlet Pressure 19 kPa (2.78 psi)
Minimum Gas LHV 800 BTU/FT3
Maximum H2S Rate 0.1% These gas trains are designed for installation as shown and are not to be disassembled to the individual components during assembly. Gas trains are comprised of several main components that serve a role in providing clean fuel to the engine fuel inlet at the required pressure. The main gas train components are shown in illustration 1 below.
Illustration 1 g03398944
(A) Weldable flange
(B) Manual Isolation Valve
(C) Pressure Gauge
(D) Gas Filter
(E) Pressure Regulator
(F) Dual Solenoid Shutoff Valve
(G) Flexible HoseMain Components
Weldable Flanges
Inlet and outlet flanges are provided with each gas train designed to be welded to customer supplied piping. These flanges can then be bolted directly to the inlet or outlet of the gas train. The outlet weldable flanges are not required as the outlet connection on the flexible hose can mate directly to the engine fuel inlet.Manual Isolation Valves
A manual isolation valve is provided with each gas train on the inlet side prior to the gas filter. The manual valve allows for isolation of the gas train and engine from the fuel source. The manual isolation valve will either be a ball valve or a butterfly valve depending on the specific gas train purchased. When leak testing gas supply piping this valve should be closed to prevent a pressure spike from damaging the gas train components.Note: Quickly opening the manual isolation valve can permanently damage other gas train components. The manual isolation valve should be opened slowly to allow for a gradual build of pressure in the system.Pressure Gauges
Illustration 2 g03398986
(A) Manual push buttonThree pressure gauges are provided with the typical gas trains. The gauges will either be 0 - 70 kPa (0 - 10 psi)or 0-600 mbar gauges depending on the intended market for installation. The first two are on the inlet and outlet sides of the gas filter to show differential pressure across the filter. The third gauge is on the outlet side of the shutoff valves to show inlet fuel pressure feeding into the engine. Each gauge is equipped with a manually operated shutoff device between the measuring line and pressure gauge. In the normal state, the push-button cock is closed. Therefore, the pressure gauge is relieved of pressure. The push button must be pushed to apply pressure on the pressure gauge (illustration 2).Gas Filter
Filter systems are utilized to increase the service life of gas engines. Gas lines contain varying amounts of scale and rust which can causemalfunction or damage to the gas train and engine components. The filters used on