Spiral Wound Gasket ASME B16.20 Inner + Outer Ring SS316/Graphite

Description

1. Product Overview

The Spiral Wound Gasket ASME B16.20 (Inner + Outer Ring, SS316/Graphite) is a precision-engineered metallic gasket designed for high-pressure and high-temperature flange sealing in critical industrial piping and pressure-retaining equipment. It combines a corrosion-resistant SS316 stainless steel winding with flexible graphite filler, housed by inner and outer stainless steel rings to ensure centricity and radial containment. The product delivers reliable leak-tight performance across steam, hydrocarbon, petrochemical, power generation, and refinery applications, reducing unplanned downtime and maintenance cost. Strategically, it meets ASME B16.20 specifications—making it a preferred, standards-compliant choice for procurement teams focused on safety, long-term operational integrity, and regulatory conformity.

2. Key Specifications & Technical Characteristics

• Standard: ASME B16.20 compliant for spiral wound metallic gaskets.

• Materials: Winding material SS316 (AISI 316L option available on request); filler material flexible graphite (high-purity, expanded graphite).

• Inner & Outer Rings: SS316 full-height inner and outer rings for flange protection and centering.

• Graphite Grade: High-density flexible graphite, free of asbestos and halogen contaminants; anti-extrusion properties.

• Temperature Range: Typical service up to 550°C (graphite dependent); cryogenic service variants available.

• Pressure Rating: Suitable for ASME class service up to common high-pressure classes (verify per flange rating and gasket dimensions).

• Dimensions: Available in standard ASME flange sizes and custom dimensions, standard cross-sections per ASME B16.20.

• Surface Finish: Metallic winding with uniform corrugation; graphite filler with controlled thickness and density.

• Chemical Compatibility: Resistant to steam, hydrocarbons, oils, most acids and bases; check compatibility list for specialty chemicals.

• Physical Form & Color: Layered spiral wound ring assembly; metallic silver exterior with dark graphite filler visible on cut sections.

• Packaging: Export-grade wooden crates or palletized steel cages; individual cartons with moisture-barrier wrapping and desiccant; custom packaging available for project cargo.

• Shelf Life: Indefinite under dry, ambient storage; recommended storage away from direct moisture and corrosive atmospheres.

• Documentation: Supplied with mill certificates (material traceability), manufacturing inspection reports, and installation guidelines per ASME recommendations.

3. Core Industrial Applications

• Primary Industries: Oil & gas (upstream, midstream, downstream), petrochemical and chemical processing, power generation (steam turbines, boilers), refining, LNG, marine and shipbuilding, heavy industry (cement, pulp & paper).

• Operational Use Cases: Flange sealing on heat exchangers, pressure vessels, reactor and distillation columns, high-pressure pipeline flanges, boiler and steam systems, valve and pump flanges in corrosive environments.

• Performance Advantages vs Alternatives: The combination of SS316 winding and graphite filler provides superior conformability and recovery compared with metal-only or compressed non-metallic gaskets, enabling reliable sealing across flange surface irregularities and thermal cycling. Inner and outer rings protect flange faces from extrusion and corrosion, improving longevity compared with non-ringed spiral gaskets. Cost advantages arise from reduced maintenance frequency and lower leak incidence, translating to higher plant uptime and lower total cost of ownership.

4. Competitive Advantages

• Quality Consistency: Manufactured to ASME B16.20 with controlled production processes and batch traceability; material certificates included.

• Supply Reliability: Production and inventory planning optimized for bulk orders; regional stocking options available to minimize lead times.

• Logistics Capability: Export-compliant packaging, sea/road freight consolidation, and experience handling heavy industrial consignments; can coordinate FOB/CIF/DDP terms per buyer requirement.

• Price Competitiveness: Economies of scale for BULK 20MT orders; competitive pricing tiers for long-term contracts and repeat procurement.

• Sustainability: Graphite filler is asbestos-free and conforms to modern environmental and worker-safety standards; SS316 is widely recyclable, supporting circular material strategies.

• Technical Support: Engineering datasheets, installation and torque tables, gasket selection guidance, and on-request cross-references to flange standards; post-sale technical assistance and failure-analysis support available.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20MT.

• Loading Capacity (MT per container): Typical loading capacities for standard 20-foot and 40-foot containers depend on gasket dimensions and packing configuration; indicative loading:

  • 20-foot GP container: up to ~18–20 MT (subject to packaging and palletization).

  • 40-foot HC container: up to ~24–26 MT (subject to packaging and palletization).

• Lead Times: Standard lead time for bulk orders available on request; expedited production options possible for contracted buyers.

• Terms: Mill certificates and inspection documentation included; FOB, CIF, or DDP incoterms negotiable.

• Contact & Ordering: Project quotations available with flange size schedule, ASME class, and material traceability requirements to finalize pricing and delivery.