NOV TOP DRIVE TDS-4S

General Overview

• Model: TDS-4S

• Manufacturer: National Oilwell Varco (NOV)

• Type: Electric Top Drive

• Application: Land and offshore drilling rigs

• Mounting: Hook or derrick-supported

Mechanical Specifications

• Continuous Torque: 30,000 ft-lbs

• Intermittent Torque: 40,000 ft-lbs

• Maximum Speed: 250 RPM

• Drive Motor: Two AC induction motors (typically 1150 HP each)

• Cooling System: Air-cooled or optional water-cooled

Electrical Specifications

• Motor Power: 2 × 1150 HP (860 kW each)

• Voltage: 600–690V AC (variable frequency drive controlled)

• Control System: NOV Amphion™ or Cyberbase™ compatible

• Drive Type: VFD-controlled (variable frequency drive)

• Braking System: Regenerative braking and/or dynamic braking resistors

Hoisting / Load Capacity

• Rated Load: 500 short tons (1,000,000 lbs)

• Load Path: API 8C rated, with lifting link assemblies

• Hook Adapter: Compatible with most industry-standard elevator links

Pipe Handling Features

• Integrated Pipe Handling System: Yes

• Link Tilt & Pipe Handler: Optional hydraulic link tilt

• Remote Control Operation: Included (console and/or wireless)

Integrated Equipment

• Quill: Non-removable / removable quill options

• Top Drive Swivel: Internal fluid path

• Washpipe Assembly: Easy service design

• Torque Monitoring: Real-time torque and RPM sensors

• Thread Saver Sub: Optional

📏 Dimensions & Weight

• Height (Approx.): ~16–18 ft

• Weight: ~45,000–55,000 lbs (varies with configuration)

• Travel Distance: Up to 45 ft (rail travel range)