System Main Shaft Nov Varco TDS11SA TDS8SA Top Drive Main Shaft Vsp

• Customization: Available
• After-sales Service: 2 Year
• Warranty: 2 Year
• Model NO.: VSP
• Manufacturing Process: Stamping
• Surface Treatment: Galvanized
• Operation Pressure: Vacuum
• Material: Cast Steel
• Transport Package: Wooden Box
• Specification: 10*10*10
• Trademark: VSP
• Origin: China
• HS Code: 8431431000
• Production Capacity: 2000pieces / Year
• Package Size: 10.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 32.000kg

Product Description

Detail Function:

1. Power Transmission & Rotational Drive;
The Main Shaft serves as a pivotal connection between the faucet and drilling motor, channeling power seamlessly into the drill string. This dynamic drive facilitates the flawless rotation of drilling tools, thus completing essential drilling operations. Unlike conventional rotary mechanisms, this innovative Main Shaft enables continuous rotation and casing operations, significantly enhancing drilling efficiency.
2. Drill String Connection & Load Support;
Interfacing with the integral faucet via a robust gearbox housing, the Main Shaft collaborates with components like lifting rings and elevators to support the drill string's entire weight and dynamic loads. During column connections or eye flipping, it ensures unwavering stability and precise alignment of the drill string.
3. Automated Control & Parameter Monitoring;
Modern top drive systems are equipped with cutting-edge sensors, offering real-time monitoring of the Main Shaft's rotation angle, torque, and more. These systems leverage AI algorithms for optimized drilling control. Highlighting this, PetroChina's patented technology employs distance measuring devices to capture rotation data, offering precise feedback for subterranean operations.
4. Risk Control & Security Assurance;
The Main Shaft's robust design strength and execution efficiency are crucial for drilling safety. In scenarios of obstruction or tool jamming, it swiftly adjusts its rotation or applies reverse torque to mitigate risks.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Material Requirements
Hydrogen Sulfide Resistant Alloy Steel
Crafted from specialized alloy steel, the Main Shaft boasts resistance to hydrogen sulfide (H2S) corrosion, ensuring durability in sulfur-rich oil and gas environments.
Materials must meet stringent low-temperature toughness criteria: with a yield strength of ≥ 310MPa, impact absorption should reach ≥ 32J individually and ≥ 42J on average at -20 ºC. For yield strengths <310MPa, individual values should be ≥ 20J, with an average of ≥ 27J.
High Strength Alloy Steel
Standard carbon steels (e.g., 50 C12, 50 C4) or alloy steels like nickel chromium and chromium vanadium, used in non-corrosive settings, require enhancement through hot rolling and cold drawing.
2. Manufacturing Standards
Chinese National Standard (GB/T 31049-2022)
Mandates static load tensile testing for the Main Shaft, with specifications varying by drilling depth (e.g., an inner diameter of ≥ 102mm at 15,000 meters, and short-term max torque ≥ 150kN · m).
New directives for direct drive top drive necessitate eliminating mechanical transmission mechanisms when directly connecting the Main Shaft to the motor, elevating transmission efficiency to 95%.
API Standard (API Spec 8C/8A)
Main load-bearing components must undergo finite element analysis to verify stress zones, ensuring safety factors meet PSL1 or PSL2 standards.
Load verification testing is essential (e.g., DQ70 top drive test load ≥ 9000kN). Selection & Certification

Adaptation to GB/T 31049 or API standards is required for land and ocean drilling. Products with ISO 9001/API dual certification are eligible for the global market.
Direct drive Main Shafts require comprehensive verification of electromechanical integration reliability due to gearbox elimination.

Maintenance Methods for Top Drive Main Shaft

1. Daily Maintenance
Cleaning & Lubrication
To maintain the pristine condition and operational integrity of the Main Shaft, it is essential to meticulously clean any mud and oil residues post daily operations. Focus on wiping critical components, like the taper joints, with a non-woven fabric to protect against the detrimental effects of chemical corrosion.
Ensure the longevity and smooth operation of your machinery with regular lubrication. Use the specified lithium-based grease as per the manufacturer's guidelines. The main shaft bearings require oil injection every 200 hours at most. Be precise in the oil quantity to prevent contamination and maintain optimal performance.
Fastener Inspection Protocol.
Safeguard the integrity of the Main Shaft by routinely verifying the pre-tightening force of connecting bolts, including lifting ring screws and coupling bolts. Adhere to technical manual standards, such as ensuring that for DQ70BS top drives, bolt torque is maintained at a minimum of 1200 N·m.

2, Comprehensive Routine Maintenance.
Precision Bearing and Seal Testing.
Every 500 operational hours, disassemble the Main Shaft bearing to inspect for wear. Measure the radial clearance using a micrometer, and replace the bearing if the clearance is found to exceed 0.05mm, ensuring optimal function.
Quarterly, replace all seals, prioritizing those made from fluororubber to effectively combat hydrogen sulfide corrosion, ensuring the system remains robust and resistant.
Dedicated Conical Interface Maintenance.
Conduct a monthly inspection of the Main Shaft cone mouth. Should the tool holder's contact rate fall below 75%, it is imperative to grind and repair the cone to prevent issues such as excessive 'horn mouth' jumping.

3, Strategic Fault Prevention and Resolution.
Advanced Vibration and Temperature Surveillance.
Equip your system with vibration sensors to monitor the Main Shaft in real-time for any deviations, maintaining a threshold of ≤ 2.5mm/s. If the temperature elevates beyond 60 ºC, pause operations to address potential lubrication or bearing concerns immediately.