LPG Injection for Stationary Engines

DieselGas Sequent IV

With the DieselGas gastek global  system, approximately 30% of the engine’s fuel demand can be replaced with propane gas. The gas tek system can be fitted to any stationary diesel engine, regardless of application.  Most of these engines run at a near constant load at constant revs, often for days or weeks at a time. These conditions allow a much higher substitution rate resulting in significant fuel (and therefore dollar) savings.  For stationary applications propane (a more pure form of LPG) is used.

In a stationary engine application the propane performs two tasks: it acts as a combustion aid to speed the rate and increase the efficiency of the diesel burn; and it also substitutes diesel, thus reducing the amount of diesel required. The most important of these is the latter - up to 30% of the diesel required can be replaced with a similar amount of propane, significantly reducing running costs.

Oil Drain Intervals

For large fleets another potential saving is through extending oil change intervals.  Engine oil analysis has proven that DieselGas significantly reduces oil contamination.  It is possible to extend oil change intervals for some applications, thus saving on downtime and consumable costs.  We recommend conducting engine oil analysis on each engine before extending any oil drain interval.

Service Life

Another saving factor that should be considered is service life.  Although difficult to estimate, all reports to date indicate service life being increased.   This is difficult to forecast due to the many factors that affect engine life, however an extra 3000 hours from any engine represents a significant capital saving.

The system is computer controlled, using sensors to determine engine load (by measuring manifold pressure coolant and exhaust tempt and engine speed for all operating conditions.  The processor constantly monitors these signals and adjusts gas flow to suit.

Gas will flow only if the engine is running under load - once the engine is shut down (for any reason), gas flow will stop automatically. The system also conducts constant error checking and data logging - in the event of any errors the processor will shut the system down, seamlessly reverting to running on diesel only.

Due to the accelerated combustion, combustion temperatures are actually reduced - the fuel burns completely before the cylinder temperature can rise.  This means operating temperatures do not increase - in some cases coolant temperature actually drops.  Lower combustion temperatures also reduce NOx formation - a gas targeted by new emission regulations. Propane substitution is capped at 30%.  Testing has shown substitution rates at a higher percentage (50% and above) can start reversing the benefits of substitution, leading to pre-ignition, localized hot-spotting and overheating in some engines - too much propane adversely alters the combustion characteristics beyond the engine design parameters (the flame propagation becomes too uncontrolled due to the higher octane rating of the propane - at 35% the diesel is still controlling combustion). The results are similar to over fuelling the engine with diesel.  With only 35% propane, diesel is still meeting most of the fuel demand of the engine.

Maintenance, Operation and Servicing

Normal maintenance and servicing remains unchanged.  After a DieselGas gastek  system is installed, normal in-service tasks can still be carried out.  The system is non-invasive - no modification to the engine or injection system is required. 

Caterpillar C9 This Caterpillar C9 was fitted with the Gas Tek system in October 2006. It was fitted with a 4500L Elgas LPG cylinder, Impco BRC gas converter using a Gastek global gas injection system. This CAT C9 has a hourly rate at 1850rpm of 47 Litres of diesel before the gas conversion. This has

Mitsubishi 350hp This Mitsubishi 350 hp was fitted with the Deiselgas gastek system in November 2007. It was fitted with a 3500L Elgas LPG cylinder, Impco BRC gas converter using the gastek sequent 4 system . This Mitsubishi has a hourly rate at 1850rpm of 48 Litres of diesel before the gas conversion

Volvo Penta This Volvo Penta 350 hp was fitted with the Gas Tek system in December 2007. It was fitted with a 3500L Elgas LPG cylinder, BRC gas converter using a gas tek global sequent 4 system. This Volvo has a hourly rate at 1800rpm of 52 Litres of diesel before the gas conversion. This has been reduced

Caterpillar 4clyinder This Caterpillar 130 was fitted with the Gas Tek system in January 2009. It was fitted with a 120L LPG cylinder, Impco BRC gas converter using a Gastek global gas injection system. This CAT has a hourly rate at 1850rpm of 16 Litres of diesel before the gas conversion. This has

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