National Oilwell 110-UE Drawworks

Manufacturer: National Oilwell
Model: 110-UE
Type: Mechanical Drawworks
Application: Medium drilling & workover rigs
The National 110-UE is a heavier-duty upgrade from the 80-series drawworks, designed for medium-depth drilling and heavier hoisting loads. The “UE” (Unitized Equipment) configuration integrates improved gearing, braking, and frame strength for higher reliability and smoother operation.
Drum Diameter: ~27–28 in
Drum Length: ~42 in
Drum Type: Single grooved drum
Main Shaft Diameter: ~7 in
Frame: Heavy cast steel
Design: Enclosed gearing, unitized frame
Rated Input Power:
450–600 HP (configuration dependent)
Drive Type:
Compound chain drive or direct drive
Compound chain drive or direct drive
Clutches:
Air-operated friction clutches
Air-operated friction clutches
Fast Line Pull: ~45,000 – 55,000 lb
Maximum Hook Load: ~250,000 – 300,000 lb
(depends on drilling line size and number of lines strung)
Drilling Line Size:
1 in – 1⅛ in wire rope (typical)
1 in – 1⅛ in wire rope (typical)
Primary Brake:
Mechanical band brake
Mechanical band brake
Auxiliary Brake:
Hydromatic brake (very common)
Hydromatic brake (very common)
Emergency Brake:
Manual band brake
Manual band brake
Number of Speeds:
4 forward + reverse
4 forward + reverse
Gear Type:
Hardened spur/helical gears
Hardened spur/helical gears
Lubrication:
Pressure or splash lubrication (varies by build year)
Pressure or splash lubrication (varies by build year)
CAT 3406 / C15 / C18
CAT 3406 / C15 / C18
Detroit Series 60
Detroit Series 60
National 7-P-50, 8-P-80, or similar mud pumps
National 7-P-50, 8-P-80, or similar mud pumps
Mechanical or SCR land rigs (1,500–5,000 ft typical)
Mechanical or SCR land rigs (1,500–5,000 ft typical)