When selecting a spiral wound flange gasket, the goal is reliable sealing across varying pressures and temperatures while protecting flange integrity. This guide highlights five strong choices, each suited for different pipe sizes, flange classes, and service conditions. The selections emphasize durability, material compatibility (304 stainless steel and graphite fillers), and suitability for flat face or raised face flanges. Ideal buyers include plant engineers, maintenance managers, and procurement pros seeking dependable, low-maintenance gaskets for metal-to-metal joints.
| Product | Pipe Size | Flange Class | Material | Best For |
|---|---|---|---|---|
| Sterling Seal and Supply, Inc. API 601 9000IR3304GR150 | 3″ | 150# | 304SS + Flexible Graphite | Smaller-diameter piping; flat or raised face flanges |
| Sterling Seal SSI90003304GR150X24 | 4″ | 150# | 304SS + Graphite | Flat/raised face joints; heat exchangers and high-temp service |
| Sterling Seal SSI90004304GR150X12 | 4″ | 150# | 304SS + Graphite | Compact option for smaller 4″ lines with robust sealing |
| Sur-Seal, Inc. Teadit 900016347GR600 | 16″ | 600 | 347SS + Flexible Graphite | Large-diameter, high-pressure, thermally cycling applications |
| Sterling Seal SSI90006304GR150X24 | 6″ | 150# | 304SS + Graphite | Medium-to-large bore with consistent compression |
Sterling Seal and Supply API 601 9000IR3304GR150
Best for smaller piping, this gasket uses 304 stainless steel spiral windings with a 304SS inner ring and a flexible graphite filler. It suits flat face and raised face flanges, providing reliable sealing in moderate high-temperature environments. The design helps prevent flange erosion and inward buckling in tight spaces.
Who should buy: maintenance teams working with 3″ lines in 150# service, needing a compact, corrosion-resistant seal. Caution: ensure ASME B16.20 compatibility markings are clear; misalignment can affect performance in dynamic systems.
Sterling Seal SSI90003304GR150X24
Designed for 4″ piping, this gasket features 304 stainless steel windings with graphite/filler, suitable for flat and raised face joints. It is promoted for heat exchangers and boiler-related applications where high temperature and pressure are present. Markings per ASME B16.20 aid inspection and traceability.
Best for: facilities needing a robust 4″ solution for hot-water, steam, or chemical service where flange erosion must be minimized. Better for: applications requiring precise gasket identification and high-temperature endurance. Caution: pack size may affect availability for quick-turn maintenance.
Sterling Seal SSI90004304GR150X12
This 4″ gasket with a 12″ inner diameter is optimized for tight 4″ lines while maintaining high sealing integrity in 150# service. It uses 304 SS windings with graphite filler, suitable for raised or flat faces and high-temperature/pressure environments. It’s a practical choice when space constraints exist but a dependable seal is required.
Best for: installations where compact size pairs with strong sealing performance. Choose this if you need a smaller outer footprint without compromising gasket stability. Limitation: inner diameter and outer diameter pairing must align precisely with flange dimensions to avoid leakage paths.
Sur-Seal Teadit 900016347GR600
A larger-diameter option at 16″ pipe size and Class 600, this gasket uses 347SS windings with graphite filler and includes a centering ring for precise placement. It’s ideal for large flange assemblies in high-temperature cycling and pressure variations. The centering ring improves alignment and compression control, reducing the risk of uneven seating.
Best for: large-scale, high-stress systems such as heat exchangers or boilers. Better for: installations where radial stability and sealing reliability are critical. Caution: larger gaskets require careful handling to avoid distortion during installation.
Sterling SSI90006304GR150X24
This 6″ gasket covers medium-to-large bore piping in 150# service with a 24″ outer diameter. The 304 SS windings and graphite filler provide durable sealing across fluctuating temperatures and pressures. The design emphasizes resilience against flange erosion and turbulent flow in demanding joints.
Best for: mid-to-large piping where a robust, long-lasting gasket is required. Choose this if you need a balance of sealing strength and compatibility with standard flange types. Limitation: larger size may require more precise handling and bolt-up accuracy during installation.
Buying Guide: How to Choose a Spiral Wound Flange Gasket
- Material compatibility: Look for 304 or 347 stainless steel windings with graphite filler when your system handles high temperatures, steam, or aggressive fluids.
- Flange type: Confirm whether the joint is flat face or raised face, as some gaskets are optimized for one or the other.
- Pressure and temperature range: Select a gasket class (e.g., 150#, 600) that matches system operating conditions to ensure reliable sealing and long service life.
- Rotation and centering features: Some gaskets include a centering ring to improve seating accuracy and reduce radial movement under pressure.
- Size considerations: Ensure the gasket outer and inner diameters align with flange dimensions to prevent leakage or seating issues.
- Maintenance and inspection: Favor gaskets with clear ASME B16.20 markings for easier inspection and traceability.
- Installation cautions: Handle large gaskets with care to avoid damage to windings or filler material during bolt-up and torquing.
Frequently Asked Questions
- What is a spiral wound gasket?
– A gasket combining metallic windings with a soft filler material to seal high-temperature, high-pressure joints. - Which gasket is best for 150# class piping?
– Most 150# options listed here, including those with 304SS windings and graphite filler, are suitable for 150# service. - What flanges can these gaskets seal?
– They are suitable for flat face and raised face flanges, and some are used with heat exchangers and boiler hands holes. - Why is a centering ring important?
– It locates the gasket on the flange face, adds radial strength, and acts as a compression limiter for even seating. - When should I choose a 600 class gasket?
– Use Class 600 when operating at higher pressures or with thermal cycling where stronger sealing is required. - Are there any handling tips for large gaskets?
– Ensure proper alignment during bolt-up and avoid bending or twisting the gasket to maintain seal integrity.