Guangzhou, China - September 8, 2025 - Guangzhou Lepu Machinery Co., Ltd., a global Dry Gas Mechanical Seals Manufacturer headquartered at No. 5, Yunkai Road, Huangpu District, Guangzhou, today releases an authoritative guide to help engineers, procurement managers and plant operators understand dry gas seal technology and select a supplier that delivers lifetime reliability.
Dry Gas Seal – Working Principles
A dry gas seal is a non-contacting, gas-lubricated mechanical seal in which a rotating mating ring with spiral-groove geometry creates a hydrodynamic pressure film between the seal faces. At only 3–5 µm film thickness, the process gas (nitrogen, CO₂ or clean air) forms a barrier that prevents product leakage to atmosphere without the need for liquid buffer fluids. The result is zero emissions, near-zero friction and maintenance-free operation for compressors, pumps, expanders and blowers.
Structure & Key Components
• Rotating Mating Ring – laser-machined spiral grooves on a tungsten-carbide or silicon-carbide substrate.
• Stationary Seal Ring – lapped to optical flatness (≤ 0.6 helium light band).
• Secondary Seals – O-rings or metal bellows isolate the process side from the atmosphere.
• Springs/Biasing System – maintains face contact during start-up and shut-down.
• Barrier Gas Ports – introduce filtered, dry gas at 2–5 bar above process pressure.
• Monitoring Ports – pressure and temperature taps for remote condition monitoring.
Core Applications
• Centrifugal & screw compressors in LNG, petrochemical and refinery units.
• High-speed turbo-expanders for hydrogen and CO₂ capture plants.
• API-compliant pumps handling supercritical fluids.
• Cryogenic and high-pressure (> 300 bar) pipelines.
• Renewable-energy hydrogen compressors and CO₂ refrigeration systems.
How to Choose a Reliable Dry Gas Mechanical Seals Manufacturer – Lepu Seal's Advantages
Manufacturing Capacity & Scale
• 40,000 m² state-of-the-art plant with Class 10,000 clean rooms for lapping and assembly.
• 300+ CNC grinders, plasma-spray coating lines and laser-groove machines deliver 5,000+ sets per month.
• In-house foundry for tungsten-carbide, silicon-carbide and carbon-graphite faces ensures material traceability and 30-day lead times.
Industry Experience
• 23 years focused exclusively on mechanical seals; first Chinese company to achieve API 682 Category 3 certification for dry gas seals.
• Reference installations in 68 countries, including ExxonMobil, Sinopec, ADNOC and Linde.
• Library of 1,800 proven groove patterns and 3-D CFD simulation models.
Customization Service
• Rapid prototyping – first article in 72 hours using additive-manufactured test rings.
• Tailored groove geometry, face material pairing and bellows design optimized for any gas, pressure, temperature (-196 °C to 450 °C).
• Full API 617 & API 682 validation test rigs; dynamic balancing to ISO 1940 G2.5.
• Remote monitoring kits (IoT pressure/temperature sensors) available as retrofit packages.
Quality & Certification
Lepu Seal's dry gas seals are manufactured under ISO 9001, ISO 14001 and ATEX 2014/34/EU standards. Every seal undergoes 100 % helium leak testing (< 1×10⁻⁶ Pa·m³/s), hydrostatic pressure proof, and 48-hour dynamic spin test before shipment.
For detailed specifications, CAD files or a free application review, contact:
Phone: +86-020-36158139
Email: mark@lepuseal.com
Media Contact
Company Name: Guangzhou Lepu Machinery Co., Ltd.
Contact Person: Mr. Mark Ao
Email: Send Email
Address:No. 5, Yunkai Road, Huangpu District
City: Guangzhou
Country: China
Website: https://www.lepuseal.com/
