Answering the need for reliable sealing in high-temperature, high-pressure systems, graphite spiral wound gaskets with stainless steel windings provide robust performance on both flat face and raised face flanges. This guide highlights five well-suited options and explains who benefits most from each choice. Each product is evaluated for best-fit scenarios, potential limitations, and practical buying considerations to help buyers choose confidently.
Overview at a glance. The table summarizes key attributes to compare at a glance:
| Product | Pipe Size | Class/Pressure | Filler | Outer Ring | Best For |
|---|---|---|---|---|---|
| SSI90003304GR150X24 | 4″ | 150# | Flexible | Graphite/Carbon Steel | Flanged joints on heat exchangers |
| SSI90006304GR150X24 | 6″ | 150# | Flexible | Graphite/Carbon Steel | Medium-to-large pipe runs |
| SSI90002304GR150X24 | 2″ | 150# | Flexible Graphite | Graphite/Carbon Steel | Compact installations |
| SSI90002304GR300X12 | 2″ | 300# | Flexible Graphite | Graphite/Carbon Steel | Higher-pressure service |
| SSI9000IR.750304GR150X24 | 3/4″ | 150# | Flexible Graphite | 304 Stainless Inner Ring | Close-fit piping with inner-ring needs |
Sterling Seal SSI90003304GR150X24 Gasket, 4-Inch, 150#
The 4″ diameter gasket uses 304 stainless steel windings with flexible filler inside a graphite/Carbon Steel outer ring. It is designed for flat and raised face flanges and supports high-temperature, high-pressure service. Markings per ASME B16.20 are etched for traceability. Best for medium-sized pipelines and heat exchangers that require solid erosion resistance and stable gasket geometry.
- Best for: Medium piping systems with 4″ diameter flanges
- Why selected: Balanced size and robust graphite filler for reliable sealing
- Caution: Inner geometry may limit extremely tight tolerances on unconventional flange faces
Sterling Seal SSI90006304GR150X24 Gasket, 6-Inch
This 6″ spiral wound gasket features 304 stainless steel windings with a graphite-filled outer ring. It is a high-temperature, high-pressure sealing solution for flat and raised face flange joints, including heat exchangers and boiler hand holes. It includes ASME B16.20 markings for traceability. Best for larger-diameter piping where stable gasket performance and erosion resistance are critical.
- Best for: Larger flange assemblies and high-energy systems
- Why selected: Large ID and robust filler for dependable sealing under strain
- Caution: Outer ring material may require compatible corrosion protection in certain environments
Sterling Seal SSI90002304GR150X24 Gasket, 2-Inch
Designed for 2″ piping, this gasket uses 304 stainless steel windings with graphite filler and a carbon steel outer ring. It suits compact systems and applications requiring reliable seals in limited spaces. Ideal for maintenance projects and retrofits where a compact, graphite-filled gasket is needed.
- Best for: Small-diameter piping and retrofit jobs
- Why selected: Compact size with durable graphite filler
- Caution: Smaller ID may limit use in very high-pressure scenarios
Sterling Seal 90001316GR1500X12 316L Gasket
This 1″ pipe gasket uses 316L stainless steel windings with flexible graphite filler and a green band with grey stripes for easy identification. The inner ring configuration supports higher corrosion resistance in demanding environments. Selected for tight spaces with enhanced chemical tolerance.
- Best for: Small, corrosion-prone lines needing high resistance
- Why selected: Superior stainless steel grade for aggressive media
- Caution: 316L cost and availability may be a consideration in some supply chains
Sterling Seal SSI90002304GR300X12 Gasket, 2-Inch 300#
Heralded for 2″ piping at 300#, this gasket includes 304 stainless windings and a graphite-filled outer ring to withstand higher-pressure circumstances. It also features ASME B16.20 markings for traceability and helps minimize flange erosion and turbulence. Best for critical high-pressure joints where reliability is essential.
- Best for: High-pressure service on small lines
- Why selected: 300# class offers added sealing capacity
- Caution: Availability may vary due to specialized manufacturing
Buying Guide: Key Considerations For Graphite Spiral Wound Gaskets
- What flange type do I have? Flat face or raised face affects gasket choice and seating behavior. Some gaskets are specifically sized for both.
- What is the operating temperature and pressure? Higher temperatures and pressures favor graphite-filled designs with robust inner rings and stainless windings.
- What filler and outer ring materials are compatible with my fluid? Graphite is versatile but consider chemical compatibility with the process fluid and corrosion potential in the surrounding environment.
- Do I need an inner ring? An inner ring helps center the gasket and protects the ductile metal from media exposure, which is useful in high-pressure or erosive environments.
- What is the installation environment? For heat exchangers or boiler hands, a gasket designed for high-temperature, high-pressure service reduces maintenance cycles.
- Maintenance and traceability: Look for ASME B16.20 markings for gasket identification and traceability.
- Size and availability: Keep spare sizes common in your system inventory to avoid downtime during replacements.
Frequently Asked Questions
- What is a graphite spiral wound gasket? A gasket with a spiral-wound metal and soft filler (graphite) sealing element, typically with an outer ring of carbon steel or other metal, designed to handle high temperatures and pressures.
- Why choose an inner ring gasket? An inner ring centers the gasket and protects the seal surface, reducing the risk of media leaking through the center under high pressure.
- Are these gaskets suitable for boiler rooms? Yes, many models are designed for high-temperature, high-pressure services such as boilers, heat exchangers, and related equipment.
- What should I consider for flange compatibility? Ensure the gasket size, flange standard (e.g., ANSI/ASME), and whether the flange is flat-faced or raised-faced align with the gasket’s design.
- Do these gaskets require special handling? They should be installed per standard bolting patterns and torque specs to prevent creep and ensure a proper seal.
- Can graphite fillers be used with all fluids? Graphite is compatible with many hydrocarbons and most non-oxidizing fluids, but check chemical compatibility for aggressive chemicals.
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