Used National 80-UE Drawworks

National 80‑UE Drawworks – Typical Specifications

Engine & Power System
• Rated Power: Typically around 800–900 HP (engine selection and configuration may vary)
• Drive System: Combines a mechanical drive with hydraulic control to ensure efficient power transmission and precise operation.

Torque & Pullback Capacity
• Pullback (Line Pull) Capacity: Engineered to deliver approximately 80 tons of pullback force (roughly 160,000 lbs), making it suitable for medium-duty drilling applications.
• Torque Output: Designed to provide around 20,000–25,000 lb‑ft of torque for smooth and controlled cable handling.

Drum & Cable Handling
• Drum Diameter: Typically features a drum in the 24–28 inch range to balance cable capacity and operational efficiency.
• Cable Speed: Optimized for low-speed operation, generally around 40–50 ft/min, to ensure smooth cable movement and reduce shock loads on the drill string.
• Cable Capacity: Configured to handle moderate drill string lengths and cyclic operations.

Clutch & Brake System
• Clutch Assembly: Utilizes a multi‑plate, low‑speed clutch system for smooth engagement/disengagement under heavy load conditions.
• Brake Assembly: Features integrated friction brakes engineered for rapid, controlled deceleration to maintain precise cable tension.
• Thermal Management: Design elements are incorporated to dissipate heat efficiently during continuous operation.

Hydraulic & Control Features
• Hydraulic System: Typically operates at pressures around 2500 psi, offering precise control of feed and disengagement functions.
• Digital Control Interface: Provides real‑time monitoring of key operating parameters (drum speed, torque, and hydraulic pressure) along with built‑in safety features such as overload protection.

Construction & Durability
• Materials: Built from high‑strength, heat‑treated alloy or structural steel designed to endure harsh drilling environments and high-cycle duty.
• Overall Weight & Footprint: The complete system generally weighs in the range of 15,000–20,000 lbs, with a compact design that integrates seamlessly into standard rig layouts.
• Maintenance: Engineered for extended service intervals and ease of maintenance, helping to reduce rig downtime.