RTJ Flange
RTJ flange is a high-integrity sealing flange using a metal ring gasket, ideal for high-pressure and high-temperature oil & gas service.
RTJ Flange Supplier In China
SSM производит RTJ flanges using premium corrosion-resistant materials, including carbon steel, stainless steel, and nickel-based alloys. These flanges are engineered for high-pressure and high-temperature environments where reliable sealing is critical, and are widely used in oil & gas, petrochemical, chemical processing, marine, and power generation industries.
Our RTJ flanges have the following specifications:
- Диапазон размеров: 1/2″ to 48″ (DN15 to DN1200)
- Номинальное давление: Class 150 to Class 2500
- Facing Type: Ring Type Joint (RTJ) with Oval, Octagonal, RX, or BX ring grooves
- Стандарты: ASME B16.5, ASME B16.47 Series A/B, API 6A, MSS SP-44
- Material Specifications: ASTM A105, ASTM A350 LF2, ASTM A182 F304/F316, ASTM B564 (Nickel Alloys)
- Типы: Weld Neck RTJ Flanges, Blind RTJ Flanges, Slip-On RTJ Flanges, Lap Joint RTJ Flanges, Studded RTJ Flanges
RTJ Flange (Ring Type Joint Flange) Features
In high-temperature, high-pressure, and highly corrosive environments, traditional flat sealing methods often fail to ensure reliable performance.
To address this issue, engineers developed the RTJ flange (Ring Type Joint Flange).
It is a type of flange that uses a metal ring gasket seated in a precision-machined groove to achieve a metal-to-metal seal, widely applied in oil, gas, refining, chemical, and offshore industries.
Unlike conventional RF (Raised Face) or FF (Flat Face) flanges, the RTJ flange is characterized by:
- A precision-machined groove on the flange face.
- Oval or octagonal metal ring gaskets as the sealing element.
- Bolt preload compresses the gasket into the groove, creating a highly reliable seal.
This design ensures excellent sealing performance under extreme service conditions.
Advantages and Disadvantages of RTJ Flanges
Compared with other flange types, RTJ flanges offer significant benefits:
- High sealing reliability – maintains tight sealing even under thousands of psi pressure and elevated temperatures.
- Superior leak resistance – ideal for critical pipelines such as high-pressure gas and crude oil transport.
- Отличная коррозионная стойкость – when paired with nickel alloy materials, suitable for harsh chemical and marine environments.
- Reusability – the flange body can be reused by simply replacing the ring gasket, reducing maintenance costs.
Недостатки
Despite their advantages, RTJ flanges also have limitations:
- Higher manufacturing cost – groove machining requires strict tolerances and advanced equipment.
- Strict installation requirements – accurate alignment and uniform bolt tightening are essential.
- Not economical for low-pressure systems – excessive for applications where sealing demands are less critical.
As a result, they are mainly used in applications where leak prevention is critical.
RTJ Flange Gasket Types
RTJ flanges must be used with metal ring gaskets, commonly including:
- Oval Ring Gasket – stable sealing, relatively lower machining requirements.
- Octagonal Ring Gasket – provides superior sealing, but requires higher groove precision.
- Special Types (RX, BX Series) – typically used in high-pressure API equipment (above Class 5000).
One-Stop RTJ Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing RTJ Flanges. Whether it’s quality or price, we will meet your needs.
Related RJT Flanges Infomation
RTJ Flanges Manufacturing Challenges
The critical aspect of RTJ flange manufacturing lies in:
- Groove machining requires CNC precision turning with tight tolerances.
- The sealing surface must be smooth and free of scratches, otherwise leakage may occur.
- Large-size flanges or high-alloy materials (such as duplex or nickel alloys) significantly increase machining difficulty and tooling requirements.
Therefore, RTJ flanges are typically produced by specialized manufacturers with advanced machining capability.
Installation Guidelines and Common Issues
Инструкции по установке:
- Ensure precise alignment of flanges and ring gaskets.
- Tighten bolts diagonally and uniformly, in multiple steps.
- Inspect sealing surfaces and gaskets, and avoid using damaged parts.
Common Issues:
- Surface scratches on grooves → lead to leakage.
- Uneven bolt preload → causes incomplete sealing.
- Excessive reuse of gaskets → results in seal failure.
Часто задаваемые вопросы
Not recommended; they are specifically designed for high-pressure applications.
Octagonal gaskets provide a tighter seal but require higher machining accuracy.
No, RTJ flanges must be paired with matching RTJ flanges and dedicated ring gaskets.
With over 30 years of experience, SINO SPECIAL METAL (SSM) is a trusted manufacturer and supplier of RTJ flanges:
Production Capability: Supplies carbon steel, stainless steel, and nickel alloy RTJ flanges, fully compliant with ASME / API standards.
Конкурентоспособные цены: Direct factory supply with cost-effective solutions for bulk orders.
Quality Assurance: 100% PMI material testing, strict dimensional accuracy, and EN 10204 3.1/3.2 MTC certification available.
Fast Delivery: Stock available for standard sizes; customized orders delivered within 15–30 days.
Comprehensive Service: Third-party inspection, export-standard packaging, and worldwide delivery.
Choose SSM for reliable, high-quality RTJ flanges – we look forward to being your trusted partner!
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