NORSOK IX seal ring gaskets are high-integrity metal sealing rings designed for compact flange connections according to NORSOK L-005 and ISO 27509 standards.

Manufactured from solid metal materials such as:

• UNS N06625 (Inconel 625)
• Duplex stainless steel
• low carbon steel
• corrosion-resistant alloys

IX seal rings provide:

• exceptional sealing integrity
• high-pressure resistance
• superior corrosion resistance
• reliable performance in offshore and subsea environments

NORSOK IX seal rings are widely used in:

• offshore oil & gas platforms
• subsea systems
• compact flange connections
• high-pressure pipeline systems
• FPSO piping systems
• sour service applications

We are a professional manufacturer and exporter of:

• NORSOK IX Seal Ring Gaskets
• NORSOK L-005 Type IX Ring Gaskets
• UNS N06625 Seal Rings
• Compact Flange Seal Rings
• ISO 27509 Metal Seal Rings

in China.

---

What is a NORSOK IX Seal Ring Gasket?

A NORSOK IX seal ring gasket is a solid metal profiled sealing ring designed for compact flange systems according to:

• NORSOK STANDARD L-005 COMPACT FLANGE
• ISO 27509

Unlike conventional spiral wound gaskets, IX seal rings create:

• metal-to-metal sealing
• high-integrity pressure containment
• dual sealing performance

IX seal rings are specifically developed for:

• high-pressure offshore systems
• subsea piping
• critical process piping
• compact flange connections

The seal ring works by:

• axial preload
• radial sealing force
• elastic stored energy

to achieve:

• reliable sealing
• leak prevention
• long-term operational integrity

---

NORSOK L-005 Standard

NORSOK L-005 is the Norwegian standard covering:

• compact flange connections
• seal ring gasket systems
• offshore piping systems

The standard defines:

• flange geometry
• seal ring dimensions
• preload requirements
• sealing mechanisms
• inspection requirements

NORSOK IX seal rings are specifically designed for:

• compact flange sealing systems
• offshore oil & gas applications

---

How Does IX Seal Ring Work?

IX seal rings create sealing through:

• axial bolt preload
• radial sealing pressure
• elastic deformation of the seal ring

During installation:

• bolt preload compresses the seal ring
• sealing stress is transferred into radial sealing force
• face-to-face flange contact is achieved

The design creates:

• primary seal at the flange heel
• secondary seal at the IX ring interface

This dual sealing mechanism provides:

• high integrity sealing
• leak prevention
• enhanced safety

---

Advantages of NORSOK IX Seal Ring Gaskets

High Integrity Sealing

Designed for:

• critical offshore applications
• high-pressure systems
• subsea environments

Metal-to-Metal Seal

Provides:

• reliable sealing performance
• excellent pressure resistance

Excellent Corrosion Resistance

Available in:

• Inconel 625
• Duplex stainless steel
• corrosion-resistant alloys

Compact Flange Compatibility

Designed specifically for:

• compact flange systems
• NORSOK L-005 connections

Improved Safety

The design minimizes exposure to:

• oxygen
• corrosive agents
• external contamination

helping prevent:

• flange corrosion
• bolt corrosion
• sealing surface degradation

---

NORSOK IX Seal Ring Specifications

Specification	Details
Product Type	IX Seal Ring Gasket
Standard	NORSOK L-005 / ISO 27509
Design Type	Metal Profiled Seal Ring
Application	Compact Flange Connection
Seal Type	Metal-to-Metal Seal
Service	High Pressure / Offshore / Subsea

---

Available Materials for IX Seal Rings

UNS N06625 (Inconel 625)

Provides:

• excellent corrosion resistance
• sour service performance
• high-temperature resistance

Duplex Stainless Steel

Suitable for:

• offshore seawater systems
• chloride environments

Low Carbon Steel

Used for:

• standard service conditions
• economical sealing applications

Custom Alloy Materials

Available according to:

• project specifications
• operating conditions

---

UNS N06625 IX Seal Ring

UNS N06625 (Inconel 625) is one of the most commonly used materials for:

• offshore compact flange systems
• subsea sealing applications
• sour gas service

Inconel 625 provides:

• excellent pitting resistance
• outstanding crevice corrosion resistance
• high strength
• excellent fatigue resistance

---

Typical Mechanical Properties of IX Seal Ring Materials

Typical minimum material requirements at design temperature:

Property	Requirement
Minimum Yield Strength	300 MPa
Minimum Ultimate Tensile Strength	360 MPa

These properties allow:

• elastic spring-back
• reliable sealing preload
• long-term sealing integrity

---

Compact Flange Sealing Mechanism

The IX seal ring works together with:

• compact flange taper surfaces
• bolt preload
• flange heel contact

This creates:

• primary metal seal
• secondary pressure-energized seal

Any internal leakage pressure further intensifies:

• seal ring sealing action

This self-energizing sealing mechanism improves:

• sealing reliability
• leak prevention
• operational safety

---

Corrosion Resistant Coating

IX seal rings are often supplied with:

• PTFE coating
• corrosion-resistant coatings
• anti-galling surface treatment

PTFE coating provides:

• improved corrosion resistance
• easier installation
• visual identification

---

IX Seal Ring Pressure Ratings

NORSOK IX seal ring gaskets are commonly used for:

• high-pressure systems
• compact flange applications

Available Pressure Classes

• Class 150
• Class 300
• Class 600
• Class 900
• Class 1500
• Class 2500

PN Ratings

• PN50
• PN260
• PN420

Maximum pressure depends on:

• flange design
• material grade
• operating temperature

---

Temperature Range

Temperature capability depends on:

• seal ring material
• flange material
• operating conditions

Common alloy materials such as UNS N06625 provide excellent performance in:

• offshore environments
• corrosive service
• elevated temperature systems

---

Applications of NORSOK IX Seal Ring Gaskets

Offshore Oil & Gas Platforms

Used in:

• topside piping
• compact flange systems
• process piping

Subsea Systems

Applied in:

• subsea manifolds
• subsea pipelines
• subsea connectors

FPSO Systems

Suitable for:

• weight-sensitive piping systems
• high-integrity sealing systems

High Pressure Pipelines

Used in:

• transmission systems
• offshore pipelines
• gas processing systems

Their high-integrity sealing design makes IX seal rings ideal for critical offshore applications.

---

NORSOK IX Seal Ring vs RTJ Gasket

Property	IX Seal Ring	RTJ Gasket
Sealing Method	Compact Metal Seal	Ring Joint Seal
Flange Type	Compact Flange	RTJ Flange
Offshore Performance	Excellent	Good
Weight Reduction	Better	Standard
Fatigue Resistance	Higher	Moderate

IX seal rings are preferred for:

• compact flange systems
• subsea applications
• high-integrity offshore piping

---

Manufacturing Process of IX Seal Rings

Typical manufacturing process includes:

• forging or machining
• precision CNC machining
• profiling
• coating application
• dimensional inspection
• surface inspection

Strict quality control ensures:

• sealing profile accuracy
• dimensional precision
• reliable sealing performance

---

Inspection and Testing

IX seal rings may undergo:

• dimensional inspection
• visual inspection
• PMI testing
• hardness testing
• material verification

Optional third-party inspection:

• DNV
• BV
• ABS
• SGS
• TUV

Products can be supplied with:

• EN 10204 3.1 certificates
• material traceability documentation

---

NACE MR0175 Compliance

IX seal ring gaskets can be manufactured according to:

• NACE MR0175
• ISO 15156
• offshore sour service requirements

Suitable for:

• H₂S environments
• offshore sour gas systems
• subsea production systems

---

Why Use IX Seal Rings in Offshore Systems?

IX seal rings provide:

• superior leak prevention
• compact flange compatibility
• reduced maintenance
• improved operational safety
• high fatigue resistance

These advantages reduce:

• offshore downtime
• maintenance cost
• leakage risk

---

Frequently Asked Questions

What is a NORSOK IX seal ring gasket?

It is a high-integrity metal seal ring designed for compact flange systems according to NORSOK L-005.

What is UNS N06625 seal ring?

It is an Inconel 625 metal seal ring with excellent corrosion resistance for offshore and sour service applications.

What is the difference between IX seal ring and RTJ gasket?

IX seal rings are designed for compact flange systems, while RTJ gaskets are used in traditional RTJ flanges.

Are IX seal rings suitable for subsea systems?

Yes. IX seal rings are widely used in subsea and offshore high-pressure systems.

Can IX seal rings meet NACE MR0175 requirements?

Yes. NACE compliant IX seal rings can be supplied for sour service applications.

---

Related Products

Compact Flange Systems

• Compact Weld Neck Flanges
• Compact Blind Flanges
• ISO 27509 Flanges

Our NORSOK IX seal ring gaskets are manufactured according to international offshore standards for reliable high-integrity sealing performance.

---