National 110UE Drawworks

National 110UE Drawworks – Specifications

Manufacturer: National Oilwell (NOV)
Model: 110UE
Type: Mechanical Drawworks (hoisting system)

General Description

The 110UE is a large, high-capacity drawworks designed for land drilling rigs in the 100,000+ lb pull class. It features a robust drum, gearbox, braking system, and power end adapted for continuous drilling/hoisting duty.

Hoist / Drum

• Drum Capacity: Large multi-layer cable capacity for deep wells

• Drum Diameter & Length: Sized for heavy line loads (typically >48–60 in diameter, large axial length)

• Brake: Often paired with large electromagnetic brake (e.g., NOV Elmagco style)

Line Pull & Speed

The 110UE is classed for heavy hoisting loads:

• Line Pull Capacity:

  • Upper layer (first layer): ~100,000+ lb gross line pull

  • Multi-layer derated accordingly as rope stacks

• Line Speed:

  • Variable, depending on power package and transmission

  • Typical top-end speeds in drilling mode ~80–100 ft/min on first layer

(Exact values vary by rig gear ratio and power end drive.)