Engine & Power System
• Rated Power: Approximately 1625 HP from a high‑performance diesel engine
• Drive System: A robust, integrated mechanical and hydraulic drive system designed for efficient power transfer and consistent performance under high-cycle duty
Torque & Pullback Capacity
• Pullback (Line Pull) Capacity: Engineered for heavy-duty operations, with pullback forces typically in the range of about 220–250 tons (roughly 440,000–500,000 lbs)
• Torque Output: Optimized to deliver around 35,000–40,000 lb‑ft of torque, ensuring smooth and controlled cable handling even under heavy loads
Drum & Cable Handling
• Drum Diameter: Usually configured with a drum diameter of approximately 30–36 inches to maximize cable capacity and efficiency
• Cable Speed: Designed for controlled, low-speed operation with typical cable speeds of around 40–60 ft/min to minimize shock loads on the drill string
• Cable Capacity: Engineered to support long drill strings and high-cycle operations in demanding drilling environments
Clutch & Brake System
• Clutch: Features a multi‑plate, low‑speed clutch assembly that provides smooth engagement/disengagement, essential for handling high torque loads
• Brake Assembly: Integrated friction brakes engineered for rapid, controlled deceleration and precise cable tensioning
• Thermal Management: Designed with features to dissipate heat effectively during extended high-load operations
Hydraulic & Control Features
• Hydraulic System: Operates at pressures typically in the 2500–3000 psi range to allow for precise control of feed and disengagement functions
• Digital Control Interface: A state‑of‑the‑art control panel provides real‑time monitoring of key parameters (drum speed, torque, and hydraulic pressure) along with integrated safety features such as overload protection and emergency shutdown
Construction & Durability
• Materials: Constructed from high‑strength, heat‑treated alloy steel and rugged hydraulic components to endure harsh drilling environments and cyclic loading
• Overall Weight & Footprint: The complete system generally weighs in the range of 25,000–30,000 lbs, with a compact design that fits standard rig layouts
• Maintenance: Engineered for long service intervals and ease of maintenance, helping to reduce downtime on high‑cycle rigs
Additional Notes on the “DE” Designation:
• The “DE” suffix in National’s model naming can denote a variant optimized for specific operational or drive characteristics. In this case, the National 1625‑DE is designed to offer the performance and durability required for deep-well and directional drilling applications while incorporating advanced control and safety features.
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