Spiral Wound Gasket for Flanges: Selection, Applications & Specifications – ITK Gasket Industries
Industrial flange joints operate under changing pressure, temperature, vibration and process conditions, making gasket selection critical for reliable sealing. A Spiral Wound Gasket for Flanges combines metallic winding with a compressible filler to create a resilient sealing element suitable for demanding piping systems. Its construction helps accommodate flange movement and thermal cycling while maintaining sealing performance.
ITK Gasket Industries provides spiral wound gaskets for industrial flange connections across chemical, petrochemical, oil & gas, refinery, power, fertilizer and general process applications. For standard applications, spiral wound gaskets are identified by flange size (NPS), pressure class and the applicable flange standard, such as ASME B16.5 or ASME B16.47.
What Is a Spiral Wound Gasket for Flanges?
A spiral wound gasket consists of alternating plies of preformed metallic winding and a pliant filler material wound into a circular sealing element. Under ASME B16.20, standard spiral wound gaskets are assembled with a centering ring, while inner rings are required or recommended for particular constructions and pressure classes.
The metallic winding provides mechanical strength and resilience, while the filler contributes to sealing against flange faces. This combination makes a Spiral Wound Gasket for Flanges suitable for applications where operating conditions can be more demanding than those typically handled by simple soft-cut gaskets.
Common winding materials include SS304 and SS316, while special alloys may be selected according to chemical compatibility. Flexible graphite and PTFE are among the commonly specified fillers.
How to Select the Best Spiral Wound Gasket for Flanges
Choosing the Best Spiral Wound Gasket for Flanges requires more than matching the nominal pipe diameter. Industrial buyers and engineers should evaluate the complete operating environment.
Important selection parameters include:
- Nominal Pipe Size (NPS)
- Flange pressure class
- ASME or other applicable dimensional standard
- Operating and design temperature
- Operating and design pressure
- Process fluid or gas
- Winding metal
- Filler material
- Inner and outer ring requirements
- Flange facing and condition
- Required chemical and corrosion resistance
The gasket must match the intended flange dimensions and pressure class. A Class 150 gasket, for example, should not automatically be considered interchangeable with a Class 300 gasket of the same nominal pipe size because centering-ring and flange dimensions can differ.
Material Options for Spiral Wound Flange Gaskets
Material compatibility directly influences gasket reliability.
Stainless Steel Winding
SS304 is commonly considered for general industrial duties, while SS316 offers enhanced corrosion resistance for many chemical and process environments. Specialized services can require alternative nickel-based or corrosion-resistant alloys.
Flexible Graphite Filler
Flexible graphite is widely used for industrial services involving elevated temperatures, steam and hydrocarbons. Its recovery characteristics also make it useful where thermal cycling is present.
PTFE Filler
PTFE provides broad chemical resistance and is often selected for corrosive process media. Its temperature capability, however, differs from graphite, so the filler should always be matched to actual operating conditions.
A qualified Spiral Wound Gasket Manufacturer for Flanges can assist customers in selecting an appropriate winding and filler combination based on service requirements.
Pressure Classes and Flange Specifications
Spiral wound gaskets are commonly associated with ASME flange pressure classes including Class 150, 300, 600, 900, 1500 and 2500.
ASME B16.20 specifies dimensions and tolerances for spiral wound gasket sealing elements, centering rings and inner rings. The current standard also specifies a centering-ring thickness range of 2.97–3.33 mm for standard covered spiral wound gaskets.
Inner rings deserve particular attention. Under ASME B16.20-2023, inner rings are required with PTFE-filled spiral wound gaskets. They are also required across all filler types at NPS 24 and larger for Class 900, NPS 12 and larger for Class 1500, and NPS 4 and larger for Class 2500.
These details demonstrate why flange size and pressure class must be communicated when ordering a Spiral Wound Gasket for Flanges.
Industrial Applications
A Top Spiral Wound Gasket for Flanges should provide dependable sealing under the actual process conditions for which it is selected. Typical applications include:
- Oil and gas processing facilities
- Petroleum refineries
- Chemical and petrochemical plants
- Power generation facilities
- Fertilizer plants
- Steam piping systems
- Process pipelines
- Pressure equipment connections
- Heat exchangers
- Pumps and valves
- Hydrocarbon processing systems
Because each application can involve different temperatures, chemicals and pressures, gasket material should never be selected solely by size.
Quality Matters in Flange Sealing
Flange sealing performance depends on the complete bolted-joint system—not just the gasket. Correct dimensions, winding construction, filler quality, flange condition, alignment and appropriate bolt loading all contribute to joint integrity.
ITK Gasket Industries focuses on supplying gaskets according to specified dimensions, material combinations and industrial requirements. Customers looking for a reliable Spiral Wound Gasket Supplier for Flanges should provide complete application data so the gasket can be matched appropriately.
Spiral Wound Gasket Price for Flanges
The Spiral Wound Gasket Price for Flanges varies according to NPS size, pressure class, winding material, filler, inner-ring material, centering-ring material, quantity and any special dimensional requirements.
Special alloys and large-diameter gaskets typically involve different material costs than standard stainless-steel constructions. Buyers should therefore request quotations using complete specifications rather than comparing only the Spiral Wound Gasket Price for Flanges per piece.
Why Choose ITK Gasket Industries?
As a Spiral Wound Gasket Manufacturer for Flanges, ITK Gasket Industries serves industrial requirements with standard and application-specific gasket solutions.
Customers looking for a Spiral Wound Gasket Supplier for Flanges or Spiral Wound Gasket Exporter for Flanges can submit flange size, class, winding material, filler, quantity and service conditions for an appropriate product recommendation and commercial quotation.
FAQs About Spiral Wound Gasket for Flanges
1. What is a spiral wound gasket used for?
It is used to seal bolted flange joints in industrial piping and equipment, particularly where pressure, temperature or operating conditions require a resilient metallic gasket.
2. Which filler is better: graphite or PTFE?
Neither is universally better. Graphite is widely used for higher-temperature industrial duties, while PTFE is often selected for chemical resistance. Selection depends on the process media and operating conditions.
3. Which flange classes use spiral wound gaskets?
They are commonly specified for ASME Classes 150, 300, 600, 900, 1500 and 2500, subject to flange design and application requirements.
4. Why is an inner ring used?
An inner ring can help limit inward buckling and provides additional support to the sealing element. ASME B16.20 requires inner rings for specific filler, size and pressure-class combinations.
5. What information should I provide when ordering?
Specify NPS, flange standard, pressure class, winding metal, filler, inner/outer ring requirements, quantity, process media, pressure and temperature.
6. Are custom spiral wound gaskets available?
Yes. Gaskets can be produced for specified industrial requirements where non-standard dimensions, materials or configurations are needed.
7. How do I get the correct gasket price?
Submit complete flange and gasket specifications to ITK Gasket Industries. Size, class, materials, configuration and quantity determine the final quotation.
Contact ITK Gasket Industries
For a reliable Spiral Wound Gasket for Flanges, contact ITK Gasket Industries with your flange size, pressure class, material, filler, operating conditions and quantity. Whether you need standard industrial gaskets or customized sealing solutions, selecting the correct specification can improve flange-joint reliability and reduce the risk of premature leakage.
