Rebuilt National 1625 Drawworks

National 1625 Drawworks – Specification Overview

Engine & Power System
• Rated Power: Approximately 1625 HP from a heavy‑duty diesel engine
• Drive System: Integrated mechanical/hydraulic drive designed for efficient power transmission and durability under high-cycle duty

Torque & Pullback Capacity
• Pullback Capacity: Engineered to deliver pullback forces in the range of about 200–250 tons (roughly 400,000–500,000 lbs)
• Torque Output: Typically optimized to provide around 40,000–45,000 lb‑ft of torque, ensuring smooth and controlled cable handling even under heavy loads

Drum & Cable Handling
• Drum Diameter: Generally features a drum with a diameter in the 30–36 inch range to maximize cable capacity
• Cable Speed: Designed for low-speed operation, with typical cable speeds around 40–60 ft/min for smooth, precise movement
• Cable Capacity: Configured to handle long drill strings and frequent cyclic operations

Clutch & Brake System
• Low‑Speed Clutch: Utilizes a multi‑plate clutch assembly engineered for smooth engagement/disengagement at low speeds and high torque
• Brake Assembly: Integrated friction brakes provide rapid, controlled deceleration, protecting the cable and ensuring precise line control
• Heat Dissipation: Features design elements to effectively manage frictional heat during extended, high-load operation

Hydraulic & Control Features
• Hydraulic System: Typically operates at pressures around 2500–3000 psi, allowing for precise control over feed and disengagement functions
• Digital Control Interface: Equipped with a control panel for real‑time monitoring of key parameters (such as drum speed, torque, and hydraulic pressure), with integrated safety features including overload protection and emergency shutdown

Construction & Durability
• Materials: Constructed from high‑strength, heat‑treated alloy steel and rugged hydraulic components to withstand harsh drilling environments
• Overall Weight & Footprint: The complete system is designed to provide a stable, compact footprint on the rig, with total equipment weight generally in the 30,000–35,000 lb range

Applications
• Suited for deep-well, directional, and high-pressure drilling operations where high pullback capacity and precise cable control are essential
• Ideal for rigs demanding reliable, high-cycle performance under dynamic, heavy-load conditions