December 2007
Special Report

Rig Floor Equipment: Generators designed for land-based drilling

Cummins Inc. introduced its Tier 2 QSK38 and QSK50 Drilling Power Modules.

Vol. 228 No. 12  


Generators designed for land-based drilling

Cummins Inc. introduced its Tier 2 QSK38 and QSK50 Drilling Power Modules. Building on the success of their V12 and V16 KV Series, the QSK product line has taken base engine durability and enhanced it with Quantum System electronics and Modular Common Rail fuel system, found on the Tier 2 QSK19 and QSK60 engines. This upgrade ensures the Tier 2 product line’s emissions compliance with quieter operation, better fuel economy, smoother power delivery and better idle stability.

The QSK38 is rated at 1,034 hp (771 kW) at 1,200 rpm and is integrated with an AVK DSG86M generator at 1,200 kVA and 600 volts. The QSK50 provides 1,480 hp (1,104 kW) at 1,200 rpm and is coupled with an AVK DSG86L6 generator at 1,750 kVA and 600 volts, Fig. 1. Both modules are ideal for the durability, reliability and power-density requirements of high-hour and hard-duty cycle applications such as SCR drilling modules. Both engines share 70% of their parts with their KV predecessors.

These engines will use the Cummins Modular Common Rail fuel system, a design that enables electronic control over fuel timing, quantity, pressure and delivery rate shape for optimum performance and reduced engine noise, as well as emissions compliance. Cummins has been able to optimize the in-cylinder combustion system to meet Tier 2 NOx levels without increasing displacement or making significant configuration changes, which means minimal installation impact.

Fig. 1

Cummins Inc.’s Tier 2 QSK50.

In addition, both the V12 and V16 engines feature many durability-enhancing components. Single-piece ferrous cast ductile pistons allow for high cylinder pressures and increased power output, contributing to a 10% plus increase in life-to-overhaul, while reducing maintenance costs. Upgraded performance parts are coupled with a fully sealed, foam-filled wiring harness, fail-safe connectors and an upgraded electronic control module that is isolated from detrimental vibration loading, to assure high availability.

The Advanced Engine Monitoring (AEM) system provides extended data logging, capturing information on fuel consumption, duty cycle and load factor, operational trends, faults and shutdown. AEM can integrate with equipment-based information systems and provides rapid troubleshooting. WO


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