27 Jan, 2026

Why Spiral Wound Gaskets are the Standard for Oil, Gas & Steam Applications

When a single gasket failure can shut down an entire refinery or create a serious safety hazard, you need a sealing solution that won’t let you down. That’s exactly why spiral wound gaskets have become the go-to choice for oil, gas, and steam applications worldwide.

These semi-metallic gaskets weren’t always the industry standard. However, after the EPA banned asbestos gaskets in 1989, the petrochemical sector required a replacement that could withstand even more extreme conditions. Spiral wound gaskets stepped up, and they’ve dominated the market ever since.

Key Insights

They’re manufactured to ASME B16.20 standards, ensuring consistent quality and compatibility across industries.

Spiral wound gaskets combine metal strength with flexible filler materials, creating seals that withstand temperatures up to 1000°C and pressures exceeding 250 bar.
Their unique edge-sealing design accommodates flange distortion and thermal cycling better than flat-surface gaskets.
The alternating metal-and-filler construction provides both structural integrity and conformability.
Most oil and gas applications use stainless steel windings with graphite filler, which offers superior heat resistance.
They’re manufactured to ASME B16.20 standards, ensuring consistent quality and compatibility across industries.

What Makes Spiral Wound Gaskets Different?

Unlike traditional gaskets cut from sheet material, spiral wound gaskets seal on their edges rather than flat surfaces. This matters more than you might think.

Sheet gaskets compress across their entire face. When flanges aren’t perfectly parallel (which is common in real-world installations), different parts of the gasket must compress by different amounts. This creates weak points where leaks develop.

Spiral wound gaskets address this issue through their unique construction. A long, thin strip of V-shaped metal is coiled with soft filler material to create a ring. When placed between flanges, the sides of these alternating layers make the seal. This edge-sealing approach accommodates surface irregularities that would otherwise defeat flat gaskets.

The metal component (typically 304 or 316 stainless steel) provides structural support and spring-back properties. The filler material, typically flexible graphite in oil and gas applications, performs the actual sealing function by conforming to microscopic surface variations.

The Three Critical Components

Understanding metallic gaskets involves understanding how their components work together. Spiral wound gaskets have three main elements, each serving a specific purpose.

Outer Centering Ring

The outer centreing ring, typically made of carbon steel or stainless steel (304 & 306 grade), positions the gasket accurately on the flange face. It also acts as a compression limiter, preventing over-tightening that could damage the sealing element. This is particularly important during hot-torque procedures during plant start-up.

Inner Ring

The inner ring, made from the same material as the metal winding, provides crucial protection. Without it, the gasket’s spirals can buckle inward under pressure, causing pieces to break off and flow into the pipeline. You definitely don’t want gasket fragments wrapping around pump impellers – a phenomenon aptly called “bird’s nesting.”

Sealing

The sealing element consists of the alternating metal and filler layers. This is where the magic happens. When compressed, the V-shaped metal profile pushes outward like a spring, whilst the filler material flows slightly to fill surface imperfections.

Why Oil and Gas Industries Rely on Them

Refineries and petrochemical plants operate under some of the harshest conditions imaginable. Equipment is regularly subjected to pressure swings, temperature fluctuations, and exposure to corrosive hydrocarbons. Standard gaskets simply can’t cope.

The EPA’s 1989 asbestos ban forced the industry to find alternatives. Previously, asbestos gaskets were used for lower-temperature applications, while ring joint gaskets served high-temperature needs. Neither option offered the versatility required for modern operations.

Spiral wound gaskets filled this gap perfectly. Their metal component withstands high temperatures without degrading. The graphite filler remains stable across a wider temperature range than most alternatives. And the spring-like structure recovers from thermal cycling that would permanently deform other gasket types.

When selecting gasket materials for oil and gas, flexibility under changing conditions is essential. Pipeline systems expand and contract. Flanges can develop slight misalignments due to thermal stress. Bolts gradually lose tension over time. A rigid gasket would fail under these conditions. Spiral wound gaskets adapt.

Steam Applications Demand Special Requirements

Steam systems present unique challenges that make choosing the right gasket material absolutely critical. Superheated steam can exceed 500°C, whilst condensate creates wet-dry cycling that accelerates gasket degradation.

The best configuration for steam boiler systems typically uses 316 stainless steel windings with flexible graphite filler. This combination handles temperature extremes, while the graphite’s natural lubricity helps maintain the seal as flanges move during thermal cycling.

Graphite offers another advantage in steam service: it doesn’t chemically react with water or steam. PTFE fillers, whilst excellent for chemical resistance, have temperature limits around 260°C – inadequate for high-pressure steam applications.

The centering ring becomes particularly important in steam systems. Power plants often use larger diameter flanges where gasket weight and handling become factors. The outer ring ensures proper positioning even on 600mm+ flanges where manual alignment would be difficult.

Pressure Class Ratings You Need to Know

If you’ve handled spiral wound gaskets, you’ve noticed markings indicating pressure classes: 150, 300, 600, 900, 1500, or 2500. These numbers correspond to ASME B16.5 flange ratings.

Higher-pressure classes use thicker metallic components and tighter construction tolerances:

A Class 150 gasket is suitable for standard applications up to approximately 20 bar.
Class 2500 gaskets, by contrast, handle pressures exceeding 400 bar in critical service.

Matching the gasket’s pressure class to your flange specification ensures proper fit and performance. Undersizing creates leak paths, while oversizing may prevent adequate compression. For custom gaskets in non-standard applications, manufacturers can modify dimensions whilst maintaining the appropriate pressure rating.

Material Selection for Specific Media

While stainless steel and graphite are suitable for most oil, gas, and steam applications, some environments require alternatives. Sour gas service containing hydrogen sulphide demands corrosion-resistant alloys like Monel or Inconel. Oxygen service strictly prohibits graphite fillers due to combustion risks – PTFE or vermiculite filler becomes necessary.

Chemical compatibility matters enormously. Graphite, whilst excellent for heat resistance, can react with strong oxidisers. Strong acids may attack certain metal alloys. The filler material must resist the specific chemicals it’ll contact without degrading or contaminating the process stream.

This is where material expertise becomes valuable. Understanding which winding and filler combinations suit particular applications prevents costly failures. When standard gaskets configurations won’t work, custom gaskets for industrial use designed for your specific operating conditions become the solution.

Application	Winding Material	Filler Material
Oil & Gas	304/316 Stainless Steel	Flexible Graphite
Steam	304/316 Stainless Steel	Flexible Graphite
General Petrochemical	304/316 Stainless Steel	Flexible Graphite

Installation Best Practices Matter

Even the best-designed gasket fails if installed incorrectly. Surface preparation makes a significant difference, and flange faces must be clean, flat, and free from corrosion pitting. Remnants of old gasket material can create leak paths.

Never reuse a spiral wound gasket. Once compressed, the filler material conforms to the original flange surfaces. Reinstalling it – even on the same joint – won’t provide reliable sealing. The cost of a new gasket pales compared to the expense of a shutdown due to leakage.
Proper bolt tightening follows a specific pattern. Start with hand-tight assembly of all bolts. Then tighten in stages using a star pattern – typically progressing through 30%, 60%, and 100% of the target torque. This distributes compression evenly and prevents gasket distortion.
Avoid lubricating the gasket or flange faces. Whilst lubricating bolt threads and washers prevents galling, any lubricant on sealing surfaces interferes with the gasket’s ability to grip the flange and maintain position.

Comparing Spiral Wound to Other Options

Ring joint gaskets, machined from solid metal, provide excellent sealing in ultra-high-pressure applications. However, they require grooved flanges and can’t accommodate flange irregularities. They’re also considerably more expensive.

Kammprofile gaskets (featuring a solid core with serrated grooves) offer good performance in some applications. They resist blow-out better than spiral wound designs but lack the flexibility needed when flanges experience movement or vibration.

Sheet gaskets cost less and work fine in lower-demand applications. But they simply can’t match the temperature range, pressure capability, or longevity of metallic gaskets in demanding service.

Spiral Wound Gasket Comparison Table

Feature	Spiral Wound	Ring Joint	Kammprofile	Sheet Gasket
Construction	Metal windings with filler material	Solid metal, machined	Solid core with serrated grooves	Compressed sheet material
Pressure Rating	High	Ultra-high	High	Low to moderate
Temperature Range	Wide range	Wide range	Moderate to high	Limited
Flange Compatibility	Standard flanges; accommodates surface irregularities	Requires grooved flanges only	Standard flanges	Standard flanges
Flexibility	High; handles movement and vibration	Low; rigid seal	Low; limited movement tolerance	Moderate
Blow-out Resistance	Good with proper centering ring	Excellent	Superior	Poor in high-pressure service
Relative Cost	Moderate	High	Moderate to high	Low
Service Life	Long in demanding applications	Long	Moderate to long	Shorter in harsh conditions
Best Application	Refineries, chemical plants, high-temperature steam	Ultra-high-pressure valves, wellheads	Static high-pressure flanges	Low-demand piping, water systems

Quality Spiral Wound Gaskets are the Top Choice

Spiral wound gaskets have become the standard sealing solution in oil, gas, and steam applications through decades of reliable performance. Their unique construction provides the flexibility, temperature resistance, and pressure capability that these demanding environments require.

Whether you’re sealing a pipeline flange at an offshore platform or a steam header at a power plant, understanding these proven gasket designs helps ensure safe, leak-free operation.

Selecting the right spiral wound gasket for your specific application requires expertise in materials, operating conditions, and industry standards. Industrial Experts specialises in supplying high-quality spiral wound gaskets and custom gasket solutions for oil, gas, steam, and other demanding applications across Australia’s highly regulated industries.