Spiral Wound Gasket with Inner and Outer Ring
Model:KXT 600 CGI
KXT 600 CGI spiral wound gasket with inner and outer ring for critical flanged joints. Class 150–2500, -200°C to +650°C, sizes 1/2" to 60". Metal options: SS304/316L, Inconel, Monel, Titanium, Hastelloy. Fillers: graphite, PTFE, mica, ceramic. Complies with ASME B16.20 and API 601. ISO 9001:2015 factory. Factory-direct pricing, 2-hour quote response.
KXT 600 CGI Spiral Wound Gasket with Inner and Outer Ring – the premium sealing solution for critical flanged joints. Engineered with a precision‑wound metallic strip and flexible filler, combined with solid inner and outer centering rings. Delivers superior sealing performance, maximum safety, and protection against flange erosion and thermal damage. Ideal for high‑pressure, high‑temperature, and cyclic service in refineries, chemical plants, power generation, and offshore facilities. Available in a wide range of metal alloys and filler materials to match any process media. Request a quote →
KXT 600 CGI – Spiral Wound Gasket with Inner and Outer Ring
The KXT 600 CGI is the most versatile and widely specified spiral wound gasket style for flat face and raised face flanges. Its unique construction incorporates a V‑shaped metallic winding with a soft filler, encased by a solid inner ring (to prevent flange erosion and turbulence) and a solid outer ring (to provide centering and limit compression). This design delivers exceptional resilience under thermal and pressure cycling, ensuring near‑zero leakage even in the most demanding services.
Trusted by engineers worldwide, the KXT 600 CGI is the preferred choice for refineries, petrochemical complexes, power plants, and offshore platforms. Its ability to self‑adjust to flange movement and irregularities, combined with its corrosion‑resistant construction, makes it the industry benchmark for critical bolted connections. Contact our engineering team for material recommendations and custom sizing.
Key Features & Benefits
- ✅ Superior Sealability – V‑shaped metallic winding and resilient filler provide an excellent seal even on damaged or irregular flange surfaces.
- ✅ Self‑Adjusting – Automatically compensates for pressure, temperature, and vibration fluctuations.
- ✅ Inner Ring Protection – Protects the flange face from erosion and turbulence, extending flange life.
- ✅ Outer Ring Centering – Ensures accurate gasket placement and prevents over‑compression.
- ✅ High Pressure & Temperature Capability – Suitable for Class 150 to Class 2500 and temperatures up to 650°C (depending on materials).
- ✅ Wide Material Choice – Available in various metal alloys (stainless steel, Inconel, Monel, etc.) and fillers (graphite, PTFE, ceramic, etc.).
- ✅ Near‑Zero Leakage – Proven to meet the most stringent fugitive emission requirements.
- ✅ Custom Shapes & Sizes – Can be manufactured to any dimension or non‑standard configuration.
FIELD EXPERIENCE
Proven in Critical Flanged Service – What Our Customers Report
Kaxite KXT 600 CGI spiral wound gaskets have been installed in hundreds of critical flanged joints across refineries, chemical plants, and power stations worldwide. Below are three anonymized examples from our service records — each demonstrates the KXT 600 CGI outperforming the previous sealing solution.
Case 01 · Refinery Hydrotreater, Shandong
Application: crude unit hydrotreater flanged joints, 450°C, Class 900, hydrogen-rich service. Replaced previous CG-style gaskets that leaked after 12-18 months in cyclic service. KXT 600 CGI has been installed for over 3 years with no leakage and no re-torque intervention, including through two plant shutdown cycles.
Case 02 · Chemical Plant Steam Header, Jiangsu
Application: high-pressure steam line, 520°C, Class 600. Client required near-zero fugitive emissions to meet EPA Method 21 requirements. KXT 600 CGI with flexible graphite filler and SS316L winding passed third-party leak testing at the tightest classification, and has been in continuous service for over 5 years without maintenance.
Case 03 · LNG Terminal, Coastal China
Application: cryogenic LNG transfer flanges, -160°C, Class 300. Selected Inconel 625 winding with PTFE filler. Passed cold commissioning without any seat leakage, and has completed multiple thermal cycles without any signs of gasket degradation or compression loss.
* Customer names withheld for confidentiality. Full case documentation available to qualified buyers upon request.
KXT 600 CGI – Spiral wound with inner ring (left) and outer ring (right)
Technical Specifications – KXT 600 CGI
| Parameter | Value / Range |
|---|---|
| Model | KXT 600 CGI |
| Style | Spiral wound gasket with inner and outer ring (CGI) |
| Flange Faces | Raised face (RF), flat face (FF), tongue & groove (T&G), male/female |
| Pressure Rating | Class 150 to Class 2500 (and higher on request) |
| Temperature Range | -200°C to +650°C (depends on filler and metal) |
| Nominal Diameter | 1/2″ to 60″ (custom sizes available) |
| Standard Thickness | 4.5 mm (standard), others on request |
| Metal Strip Materials | SS304, SS316, SS321, SS347, Inconel 600/625, Monel 400, Titanium, Nickel, Hastelloy, etc. |
| Filler Materials | Flexible graphite (98%+), PTFE, mica, ceramic, asbestos‑free |
| Inner/Outer Ring Materials | Same as metal strip or lower alloy (e.g., carbon steel for outer ring) |
| Applicable Standards | ASME B16.20, API 601, EN 1514‑2, DIN 2690, GB/T 4622, JIS B2404, and custom |
| Leakage Rate | ≤ 1×10⁻⁵ cm³/s (typical, depending on filler and load) |
* Custom combinations of metal and filler are available. Consult our engineering team for specific service conditions.
Material Selection Guide
Choose the optimal combination of metal strip and filler for your process media, temperature, and pressure.
| Metal Strip | Filler | Max. Temperature (°C) | Typical Applications |
|---|---|---|---|
| SS304 | Graphite | 540 | General industrial, steam, water, oil |
| SS316L | Graphite | 540 | Corrosive environments, acids, chlorides |
| SS316L | PTFE | 260 | Highly corrosive media, chemical processing |
| Inconel 600 | Graphite | 650 | High temperature, oxidation, thermal cycling |
| Monel 400 | PTFE | 260 | Seawater, hydrofluoric acid, marine |
| Hastelloy C276 | Graphite | 540 | Severe corrosive, sour gas (NACE) |
| Titanium | PTFE | 260 | Aggressive chlorides, oxidizing acids |
* Inner and outer rings are typically made from the same or lower alloy. Rings can be carbon steel or stainless steel.
Why Choose KXT 600 CGI Over Other Gasket Styles?
- ✔ Resilience – Handles thermal expansion and contraction better than solid metal or cut gaskets.
- ✔ Flange Protection – The inner ring prevents erosion from high‑velocity fluids, extending flange life.
- ✔ Centering Accuracy – Outer ring ensures proper gasket placement, reducing assembly errors.
- ✔ Compression Control – Outer ring limits compression, preventing over‑torque damage.
- ✔ Wide Service Range – Suitable for cryogenic to extremely high temperatures and pressures.
- ✔ Leakage Performance – Near‑zero leakage, meeting EPA and TA‑Luft fugitive emission standards.
- ✔ Corrosion Resistance – Available in exotic alloys for sour gas, seawater, and aggressive chemicals.
- ✔ Reusability – In some applications, the gasket can be reused if undamaged (consult engineering).
Typical Applications
Refineries & Petrochemical Crude/vacuum units, catalytic crackers, hydrotreaters, amine systems.
Chemical Processing Reactor flanges, heat exchangers, distillation columns, piping systems.
Power Generation Boiler flanges, steam lines, turbine connections, condensers.
Oil & Gas Upstream wellhead, pipeline flanges, offshore platforms, subsea equipment.
Pulp & Paper Digester flanges, recovery boilers, chemical recovery systems.
Pharmaceutical & Food Sanitary flanges (with PTFE filler) for clean‑room applications.
Quality Assurance & Certifications
Kaxite's spiral wound gaskets are manufactured under the strictest quality controls in our ISO 9001:2015 certified facility. Our production process includes:
- ISO 9001:2015
- ASME B16.20 / API 601
- 100% Dimensional Inspection
- Positive Material Identification (PMI)
- NACE MR0175 / MR0103 Compliance
- Full Traceability (EN 10204 3.1/3.2)
* Third‑party inspection (SGS, BV, TÜV) available upon request.
Packaging & Shipping
Each gasket is individually packed in plastic film to prevent moisture and contamination. Bundles are placed on wooden pallets or in sturdy wooden cases, suitable for sea, air, or rail freight. Custom packaging options (e.g., anti‑corrosion coating, colour‑coded tags) are available.
* Shipping method: by sea, train, or air – we optimise logistics for cost and speed.
Why Choose Kaxite for Spiral Wound Gaskets?
Over 30 Years of Expertise – Proven track record in supplying gaskets to the world's most demanding industries.
Full Compliance – All gaskets meet ASME, API, DIN, and other international standards.
Custom Engineering – We offer non‑standard sizes, shapes, and material combinations.
Competitive Pricing – Factory‑direct supply with no middleman costs.
Fast Delivery – Standard sizes in stock; custom orders produced in 7‑15 days.
Technical Support – Our engineers provide free consultation on material selection and installation.
Field‑Proven Reliability: Kaxite spiral wound gaskets are installed in thousands of critical applications worldwide, delivering zero‑leakage performance in refineries, chemical plants, and power stations.
Frequently Asked Questions
- Q: What is the difference between CGI, CG, and basic types?
- A: CGI (inner + outer ring) provides the highest performance for flat and raised face flanges, with both erosion protection and centering. CG (only outer ring) is used for raised face flanges, while basic (no rings) is for tongue‑and‑groove or male/female flanges.
- Q: Can I reuse a spiral wound gasket?
- A: In general, re‑use is not recommended because the metallic winding may have taken a permanent set. However, in low‑pressure, non‑critical services, some operators reuse them after careful inspection. Always consult your engineer.
- Q: What filler material should I choose for high temperatures?
- A: Flexible graphite is the standard for temperatures up to 650°C (in non‑oxidising atmospheres). For oxidising conditions above 450°C, consider mica or ceramic fillers. PTFE is limited to ~260°C.
- Q: Do you offer gaskets for NACE sour service?
- A: Yes, we can supply gaskets with materials compliant with NACE MR0175 / ISO 15156. Choose suitable alloys (e.g., 316L, Inconel, Hastelloy) and filler with low sulfur/chloride content.
- Q: What is the typical lead time for custom dimensions?
- A: For standard sizes, we keep stock and ship within 3‑5 days. Custom dimensions or special materials typically require 7‑15 days, depending on material availability and quantity.
Technical review: This page was reviewed by the Kaxite Engineering Team, Ningbo, China — specialists in spiral wound gasket design and sealing applications with over 30 years of combined experience in refinery, petrochemical, and power generation service. Last updated: 2026.
Partner with Kaxite Sealing – your reliable supplier of spiral wound gaskets with inner and outer rings. With decades of experience, a wide range of materials, and a commitment to quality, we deliver gaskets that ensure safety, reliability, and compliance in the most demanding industrial applications. Request a free design review or get a bulk quote today – our technical team responds within 24 hours.
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