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Gaskets for steel plants and metal works
Steel plants and smelters run blast furnace and coke oven gas, hot blast air above 1,000 °C, oxygen lines and huge volumes of cooling water. Large hot ducts move and vibrate, and gas leaks are a safety risk. We supply QGER gaskets and Garlock expansion joints for the iron, steel and rolling areas.
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| Representative image | Gasket / seal | Steel / metal-works use | Typical construction | Steel / metals applications | Typical standards / specifications |
|---|---|---|---|---|---|
 | Spiral Wound Gasket - QSW3 / QSW4 | High-pressure/high-temperature flange sealing with recovery under thermal cycling, vibration and pressure changes common in steelmaking utilities and gas systems. | Profiled metallic winding with graphite, PTFE or mica filler; QSW3 with outer ring or QSW4 with inner and outer rings. | Blast-furnace and coke-oven gas auxiliaries; steam and condensate; natural-gas/fuel-gas systems; compressed air; reheating-furnace utilities; pressure-vessel and process piping. | ASME B16.20; mating flanges ASME B16.5 / B16.47; ASME B31.3 for process piping or ASME B31.1 for steam/power piping as applicable. Plant piping class governs filler and metallurgy. |
| Oxygen-Service Spiral Wound / PTFE Gasket - SPECIAL CLEAN SERVICE | Sealing for oxygen-production and oxygen-distribution systems where hydrocarbon contamination and particulate cleanliness can create fire risk. | Application-selected spiral-wound or PTFE/ePTFE gasket using oxygen-compatible metallurgy/filler, cleaned, inspected, preserved and packaged for oxygen service. | Basic oxygen furnace oxygen lines; oxygen lances and distribution headers; air-separation-unit interfaces; oxygen compressor/valve/piping connections; oxygen-enriched gas systems. | ASME B16.20 or B16.21 as applicable; ASME B31.3 at piping-system level; ASTM G93/G93M and/or CGA G-4.1 for oxygen-service cleaning/cleanliness practices. Plant/OEM oxygen specification governs material compatibility and packaging. |
 | Camprofile / Kammprofile Gasket | Severe-service flange and heat-exchanger sealing where high temperature, pressure, vibration or thermal cycling requires a highly recoverable gasket. | Grooved metal core with graphite or PTFE facing; fixed or floating guide ring depending on flange arrangement. | Blast-furnace gas and hot-gas auxiliaries; coke-oven systems; oxygen/nitrogen plant equipment; heat exchangers; steam systems; high-duty water cooling and special equipment nozzles. | ASME B16.20 for grooved metal gaskets with covering layers; ASME B16.5 / B16.47 flange interfaces; TEMA/OEM exchanger requirements where applicable. |
 | Metal-Jacketed / Heat-Exchanger Gasket | Seals shell-and-tube heat exchangers, coolers and condensers where a metallic jacket protects a resilient filler. | Thin metallic outer jacket enclosing graphite or another resilient filler; single/double jacket and ribbed configurations. | Cooling-water and oil coolers; blast-furnace stove auxiliaries; compressor/intercooler exchangers; pickling/galvanizing heat exchangers; steam and process condensers. | ASME B16.20 where applicable; TEMA exchanger requirements; ASME BPVC Section VIII where the exchanger is pressure equipment; equipment drawing controls geometry. |
 | Solid Metal / Metal-Core Gasket | Extreme-temperature or special-equipment sealing where conventional soft gasket materials are unsuitable. | Solid metallic gasket or rigid metal core, optionally faced with expanded graphite or ePTFE. | Furnace and reheating equipment; high-temperature gas systems; compressor/turbine casings; pressure equipment; special covers and custom OEM joints. | ASME B16.20 where applicable; purchaser/OEM drawing for special geometries; ASME BPVC Section VIII where part of pressure equipment. |
 | Ring Type Joint (RTJ) - R / RX / BX | Metal-to-metal sealing for very high pressure and temperature where ring-joint flange connections are specified. | Precision-machined R, RX or BX metallic ring in carbon, alloy or stainless steel selected for service. | High-pressure oxygen/nitrogen compression; specialty gas systems; high-pressure process equipment; compressor piping; severe-pressure valves and flanges. | ASME B16.20; API 6A / ISO 10423 only where API-style ring-joint interfaces are specified; mating flange standard and plant piping specification govern. |
 | Flexible Graphite Gasket | High-temperature sealing with strong recovery and resistance to steam, hot gases, oils and many process fluids. | Flexible/expanded graphite with or without reinforcement or metal insertion; flat ring or custom-cut geometry. | Steam systems; reheating-furnace utilities; hot-gas and exhaust auxiliaries; valve bonnets; heat exchangers; coke-oven and blast-furnace plant services. | ASME B16.21 where nonmetallic flat-gasket dimensions apply; EN 1514-1 for PN flanges; ASME B31.3/B31.1 at piping-system level; OEM drawing for custom covers. |
 | Graphite Pressure-Seal / Cover-Seal Ring | Self-energizing sealing for severe valves and self-sealing covers under high temperature and pressure cycling. | Preformed high-density flexible graphite ring or cover-seal profile compressed by system pressure and bonnet geometry. | High-pressure steam valves; boiler/powerhouse systems; oxygen/nitrogen isolation valves where materials are compatible; blast-furnace and coke-gas severe-service valves; self-sealing covers. | ASME B16.34 and valve/OEM specification for pressure-containing valve assemblies; ASME B31.1 or B31.3 at piping-system level. |
 | CNAF / Compressed Fibre Gasket | General-purpose sealing for water, compressed air, oils, low-pressure steam and plant utilities. | Compressed non-asbestos fibre sheet with synthetic/inorganic fibres, fillers and elastomeric binder. | Cooling-water lines; compressed-air networks; lubrication skids; low-pressure steam; pumps and valves; workshops; mill utilities; auxiliary piping. | ASME B16.21; EN 1514-1; ASME B31.3/B31.1 at system level as applicable; purchaser/OEM material specification. |
 | EPDM / NBR / Neoprene / FKM Rubber Flange Gasket | Flexible low-to-medium pressure sealing for cooling water, hydraulic/lubrication auxiliaries, oils and selected chemicals. | Full-face or ring elastomer gasket in EPDM, NBR, neoprene, FKM/Viton or reinforced rubber selected for media and temperature. | Continuous-caster cooling water; rolling-mill cooling; descaling-water systems; hydraulic/oil auxiliaries; acid-plant utilities; pumps; low-pressure process services. | ASME B16.21; EN 1514-1; flange/equipment specification. Elastomer compound must be checked against water, oils, acids/alkalis, temperature and ozone exposure. |
 | PTFE / ePTFE Flat Gasket | Chemically resistant sealing for pickling acids, caustics, water-treatment chemicals and corrosion-sensitive process equipment. | Virgin/filled PTFE, restructured PTFE or 100% expanded PTFE flat gasket. | HCl/H2SO4 pickling lines; galvanizing chemical treatment; acid regeneration auxiliaries; water treatment; chemical dosing; lined piping; specialty process flanges. | ASME B16.21; EN 1514-1; ASME B31.3 at process-piping level. Chemical compatibility, permeation and creep-relaxation requirements govern final material choice. |
| PTFE Envelope Gasket | Combines chemical resistance with a compressible core for strong acids, caustics and corrosion-sensitive equipment. | PTFE envelope around compressed non-asbestos fibre or flexible graphite core; standard or custom geometry. | Pickling-acid equipment; acid regeneration; chemical tanks; filters; glass-lined/FRP interfaces where appropriate; water-treatment chemical skids. | ASME B16.21 where flat-gasket dimensions apply; EN 1514-1 for compatible PN flanges; equipment/OEM drawing for custom shapes. |
 | ePTFE Gasket Tape / Joint Sealant | Form-in-place sealing for large, irregular, distorted or non-standard steel equipment flanges and covers. | 100% expanded PTFE tape or cord compressed in place around the flange, manway or housing cover. | Large ducts and housings; furnace and gas-cleaning equipment covers; tank manways; large piping; pickling/chemical equipment; maintenance of damaged or non-standard flanges. | Equipment/OEM drawing and pressure-equipment requirements govern; ASME PCC-1 or plant bolted-joint procedure may guide assembly; ASME B31.3 applies to associated process piping where relevant. |
| Graphite / PTFE Compression Packing | Controls leakage around valve stems and selected pump, agitator or rotary shafts in water, gas, steam and chemical service. | Preformed graphite rings or braided graphite/PTFE packing selected for temperature, media, shaft/stem speed and pressure. | Cooling-water and acid pumps; valves; coke-oven/blast-furnace gas valves; mixers; utility equipment; selected rotary sealing points. | Pump/valve OEM specification and FSA/ESA packing installation guidance. API 622 / ISO 15848-1 only where fugitive-emissions valve qualification is specified. |
 | Mechanical Seal | Controls leakage around rotating process-pump shafts in cooling water, acid, chemical and utility service. | Stationary and rotating seal faces with springs and secondary seals; materials and arrangement selected for process conditions. | Descaling and cooling-water pumps; pickling/acid pumps; water-treatment pumps; hydraulic utility pumps; chemical-transfer and circulation pumps. | ISO 5199 for applicable industrial centrifugal pumps; API 682 / ISO 21049 only where an API-type shaft-sealing system is specified; pump/OEM specification governs. |
 | Non-Metallic Expansion Joint / Flexible Coupling | Absorbs thermal growth, vibration, pumping surges, duct movement and misalignment in hot-gas, air, water and process systems. | Engineered elastomeric/fabric non-metallic flexible joint with flanged or clamped ends; metallic bellows may be used in other designs. | Blast-furnace and coke-oven gas ducts; sinter-plant gas systems; baghouse/dust-collection ducts; ID/FD fans; water systems; furnace/exhaust ducting. | ASTM F1123 for arch-type non-metallic expansion joints where applicable; FSA guidance/purchaser specification; EJMA standards where metallic bellows are used; ASME B31.3/B31.1 at piping-system level. |
 | Hydraulic Seals / V-Ring Packing | Seals high-load hydraulic cylinders and reciprocating equipment exposed to pressure cycling, scale, dust and heavy-duty operation. | Urethane/elastomer V-rings, Chevron packing, plastic-faced seals and related hydraulic sealing components. | Rolling-mill hydraulic cylinders; continuous caster actuators; shears; presses; ladle/tundish equipment; furnace doors; descaling equipment; hydraulic power packs. | ISO 7425-1 / 7425-2 for hydraulic-cylinder seal housings; ISO 3601 where O-rings are used; equipment/OEM hydraulic specification governs. |
 | Precision O-Rings / Molded Elastomer Seals | Compact static and dynamic sealing in hydraulic, pneumatic, cooling, lubrication and instrumentation systems. | Precision-molded EPDM, NBR, FKM/Viton, silicone, FFKM or other specialty elastomer; backup rings may be used at high pressure. | Rolling-mill hydraulics; pneumatic actuators; cooling circuits; instruments; valves; pumps; lubrication systems; oxygen/nitrogen auxiliaries where compound-compatible. | ISO 3601 series for O-ring dimensions, housings and quality acceptance; equipment/OEM material specification governs chemical and temperature compatibility. |
 | Oil Seal / Bearing Isolator | Retains lubricant and excludes mill scale, water, dust and other contaminants from rotating shafts and bearing housings. | Elastomeric radial-shaft lip seal or non-contact labyrinth-style bearing isolator; solid or split configurations. | Rolling mills; gearboxes; conveyors; fans/blowers; pumps; motors; crushers; continuous-caster drives; coil-processing and finishing lines. | ISO 6194 series for rotary-shaft lip seals; equipment/OEM bearing, gearbox and shaft requirements govern bearing-isolator selection. |
 | Pump Diaphragm | Flexible pumping barrier for aggressive chemicals, dosing service and contaminated or solids-bearing liquids. | ePTFE wetted face bonded to reinforced elastomer backing, pure PTFE or other OEM-specific PTFE/elastomer diaphragm construction. | Pickling chemical transfer; acid/caustic dosing; water-treatment reagents; sludge and contaminated liquids; process-additive metering skids. | Pump-OEM dimensional/material specification governs. API 675 applies to controlled-volume metering pumps where specified; it does not universally apply to AODD pumps. |
 | Plate Heat-Exchanger Gasket | Seals individual plates and separates cooling or process streams in gasketed plate-and-frame heat exchangers. | Precision-molded EPDM, NBR, FKM/Viton or specialty elastomer perimeter gasket clipped or bonded to the plate. | Rolling-mill cooling; hydraulic-oil cooling; cooling-water circuits; acid-process heat recovery; compressor cooling; utility and closed-loop heat exchangers. | Heat-exchanger OEM drawing/specification controls geometry and compression. Elastomer compound is selected to process fluid and temperature requirements; proprietary plate profiles are not governed by ASME B16.21. |
 | High-Temperature Textile / Ceramic-Fiber Rope Seal | Flexible sealing for very hot furnace doors, burner interfaces, refractory access doors and hot-gas equipment where conventional gaskets cannot survive. | Braided or woven ceramic-fiber, silica, fiberglass or other OEM-specified high-temperature textile rope/tape; sometimes graphite-impregnated or jacketed. | Reheating furnaces; annealing furnaces; EAF access points; coke ovens; hot-blast stoves; burner doors; ladle/tundish auxiliaries; high-temperature inspection doors and duct interfaces. | Equipment/OEM drawing and temperature/fire specification govern. There is no single universal ASME dimensional standard for proprietary furnace-door or textile rope seals; material datasheet and plant fire/temperature requirements control. |
These are typical starting points. Final selection depends on your service conditions and is confirmed with QGER engineering before manufacture.
Points to watch
- Oxygen service needs clean, approved materials. Our graphite foil is BAM-approved for oxygen up to 250 bar and 200 °C.
- Above about 450 °C in air, flexible graphite oxidises. For hot blast service, ask us about ceramic fillers.
- Blast furnace gas contains carbon monoxide. Treat every gas joint as safety-critical and send full service data.
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Send us your drawing, standard, size and material. We reply promptly.
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