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Some of the NOx control initiatives faced by gas transmission companies in the next few years will focus upon areas where older, low specific output engines are operated. Many of these engine models have been in service for five decades and are no longer supported by OEMs. It is not surprising, therefore, that no emissions control strategy is available from the manufacturers and any effort toward that end will rely heavily upon cooperative efforts between aftermarket suppliers and end users. However, it is clear that these low BMEP engines will not support hardware costs such as are incurred when applying LEC (Low Emission Combustion) modifications to the more modern, high specific output machines. To explore lower cost solutions, a field location was chosen as a test site: two types of engines are operated which have no available LEC technology at the present time. The engine types are the Worthington UTC and LTC model pump scavenged two-cycle engines. For these applications to older machines, a medium pressure (<150psig) fuel injection mechanically actuated valve retrofitted with an enhanced mixing nozzle was suggested as a possible emissions solution. This system, based upon technology developed by DigiCon, was chosen and tested on both machines. The fundamental technology of this system was previously applied as an electronically controlled system in some other engine models. To reduce hardware costs to levels more in line for these low BMEP engines, the system for the Worthington engines was designed to operate with the existing mechanical valve train as opposed to enhanced mixing systems that utilize electronic fuel injection. The system employed on these two Worthington engines was deemed successful due to the captured fuel savings and demonstrated mid-range emission reductions. Therefore, this paper will describe the evolution of the complete on-engine system during the field test program by describing the in-field application processes with site design cons
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