Class 300 Threaded Flange

The Longan Class 300 Threaded Flange is manufactured for industrial applications where standard low-pressure threaded flanges are insufficient for vibration resistance, thermal stability, or long-term sealing reliability. It is commonly used in oil transfer systems, LNG facilities, hydraulic stations, offshore engineering projects, and industrial process pipelines exposed to pressure fluctuation and continuous mechanical vibration.

Built for Harsh Industrial Environments

Corrosion Protection Structure

PTFE-graphene composite coating is applied to threaded surfaces.

Salt spray corrosion rate reaches 0.001mm/year.

Suitable for humid, coastal, and chemical processing environments.

Reduces thread seizure risk during long-term operation.

Abrasive Media Resistance

The Threaded Flange supports applications involving mixed solid-liquid media.

In 30% sand + crude oil two-phase flow conditions, thread wear remains below 0.01mm/year.

Suitable for shale oil transport and abrasive industrial pipelines.

Helps reduce maintenance frequency in high-wear systems.

Cryogenic and Sour Gas Capability

Thread bite strength increases by 22% at -196℃ LNG operating conditions.

Suitable for low-temperature LNG transfer systems.

Resistant to sulfide stress cracking in H₂S 50ppm environments.

Meets NACE TM0177-A related testing requirements.

Stronger Connection Stability Than Standard Class 150 Flanges

Designed for Medium-Pressure Operating Conditions

Suitable for systems requiring higher connection stability than standard Class 150 threaded flanges.

Improved thread locking structure helps maintain sealing performance under pressure variation.

Suitable for medium-pressure liquid and gas transportation systems.

Commonly selected for industrial lines requiring frequent startup and shutdown cycles.

Dual-Lead Anti-Loosening Technology

The Class 300 Threaded Flange uses Longan LockThread™ anti-vibration technology.

Dual-lead thread structure reduces thread displacement during vibration.

30° wedge locking surface improves preload stability.

Self-compensating elastic thread reduces fretting wear.

Anti-fretting wear life exceeds 20 years based on provided engineering data.

Verified Leakage and Vibration Data

Reduced On-Site Processing

Suitable for Maintenance and Retrofit Projects

Simplifies replacement work in limited-access environments.

Reduces project downtime during maintenance shutdowns.

Suitable for temporary industrial pipeline systems.

Improves installation efficiency in modular construction projects.

Lower Carbon Emission During Installation

According to provided comparison data:

Single group CO₂ emissions decrease from 86kg to 12kg.

CO₂ reduction reaches 4.8 tons per 100 flange groups.

Residual value recovery rate increases from 30% to 95%.

Frequently Asked Questions

What Is the Main Difference Between Class 150 and Class 300 Threaded Flanges?

Class 300 threaded flanges are typically selected for higher-pressure systems requiring stronger sealing stability and better vibration resistance. They are commonly used in more demanding industrial environments than standard Class 150 applications.

Can This Flange Be Used in LNG Applications?

Yes. According to the provided engineering data, the thread bite strength increases by 22% under -196℃ LNG operating conditions, making it suitable for cryogenic environments.

Does the Product Require Welding During Installation?

The threaded connection structure reduces or eliminates welding requirements in many applications, helping simplify installation and maintenance work.

What Corrosion Protection Technology Is Used?

The threaded surface uses PTFE-graphene composite treatment. According to provided data, the salt spray corrosion rate reaches 0.001mm/year.

What Is the Typical Production Lead Time?

The standard lead time is generally 2–4 weeks depending on order quantity, production scheduling, and customization requirements.

Longan continues supplying Class 300 Threaded Flange products for industrial buyers requiring medium-pressure threaded flange solutions with stronger sealing performance, anti-vibration capability, and dependable factory manufacturing support.