Steam Turbine Main Oil Pump Oil Seal Ring

I. Product Overview

The steam turbine main oil pump oil seal ring is a critical sealing component installed at the rotating shaft interface of the main oil pump. It is designed to seal the lubricating oil (turbine oil) inside the pump casing, preventing oil leakage along the shaft during high-speed pump operation (up to 3000 r/min) and blocking external impurities (such as dust, moisture, and metal particles) from entering the oil circuit. This dual protection ensures the cleanliness of the lubricating oil (particle count ≤ NAS 7) and maintains stable oil supply pressure for the turbine’s bearing system and speed control mechanism, directly safeguarding the reliability of the entire lubrication system.

II. Main Features

• High Wear Resistance: Manufactured from high-quality wear-resistant alloy materials (e.g., 316L stainless steel or cobalt-based alloys) and treated with surface hardening processes (such as nitriding or laser cladding, surface hardness up to HRC 55-60). This reduces wear caused by long-term shaft rotation friction, extending the service life to over 12,000 hours of continuous operation.
• Excellent Sealing Performance: Adopts a multi-lip or labyrinth-style structural design with precise machining (dimensional tolerance ≤ ±0.01mm). The seal lip fits tightly with the shaft surface, achieving an oil leakage rate of ≤ 0.1 mL/h—effectively maintaining system pressure stability and avoiding oil waste or environmental pollution.
• Good Corrosion Resistance: The material’s chemical stability resists corrosion from trace moisture (water content ≤ 0.1%) and oxidative by-products in the lubricating oil. It remains intact even in long-term operation at oil temperatures of 40-60°C, ensuring consistent sealing performance.
• Easy to Install and Maintain: Features a split or snap-on structural design (no need to disassemble the entire pump shaft for replacement). On-site installation can be completed within 1-2 hours, reducing equipment downtime and improving maintenance efficiency.

III. Material Selection

• 316L Stainless Steel: Suitable for standard working conditions (oil temperature ≤ 60°C, no aggressive impurities). It offers balanced corrosion resistance (resists chloride ion corrosion) and mechanical strength (tensile strength ≥ 515 MPa), meeting the needs of most thermal power plant turbines.
• Nickel-Based Alloys: Designed for harsh conditions (oil temperature up to 100°C or high moisture content). It provides superior high-temperature stability and corrosion resistance, ideal for nuclear power or combined-cycle turbine units.
• Cobalt-Based Alloys: Used for heavy-duty main oil pumps with high wear risks (e.g., old unit retrofits or dusty environments). It has exceptional wear and impact resistance, ensuring reliable sealing even under unstable shaft runout conditions.

We can customize material selection based on the customer’s specific working conditions (oil type, temperature, and environmental factors) to optimize performance and cost-effectiveness.

IV. Application Areas

• Main oil pumps of steam turbines in thermal power plants (300MW, 600MW, 1000MW units).
• Lubrication system pumps for nuclear power steam turbines (adopting nickel-based alloy materials).
• Industrial steam turbines (e.g., back-pressure turbines, extraction-condensing turbines) for petrochemical or steel plants.
• Retrofit projects for old turbine units (replacing aging seal rings to improve sealing performance).

V. Custom Fabrication per Drawings

We provide precision manufacturing of steam turbine main oil pump oil seal rings strictly according to your technical drawings. Our production complies with your specified requirements: including material, structural design, dimensional tolerances, surface treatment , and sealing performance indicators.