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Gaskets for cement plants
Cement plants move hot gas, dust and abrasive raw meal through large ducts, cyclones and kilns. Ducts expand and vibrate, flanges are often non-standard, and a leaking joint lets in false air that costs fuel. We supply QGER gaskets cut to any duct size, plus expansion joints and high-temperature seals for the hot end of the plant.
Request a quoteWhere our gaskets are used
| Representative image | Gasket / seal | Cement-plant use | Typical construction | Cement-plant applications | Typical standards / specifications |
|---|---|---|---|---|---|
 | Spiral Wound Gasket - QSW3 / QSW4 | High-temperature and higher-pressure flange sealing on steam, compressed-air, fuel-gas, thermal-oil and process utility systems. | Profiled metallic winding with graphite, PTFE or mica filler; QSW3 uses an outer ring and QSW4 uses inner and outer rings. | Waste-heat-recovery systems; steam and condensate; fuel-gas or burner auxiliaries; compressed-air headers; high-temperature utility piping; pressure vessels. | ASME B16.20; mating flanges ASME B16.5 / B16.47; ASME B31.3 at process-piping level. Project piping class governs filler and metallurgy. |
 | Camprofile / Kammprofile Gasket | Severe-service sealing where temperature cycling, vibration, pressure or limited bolt load makes a highly recoverable gasket desirable. | Grooved metallic core with graphite or PTFE facing; optional fixed or floating guide ring. | Waste-heat exchangers; steam systems; hot-gas auxiliaries; large equipment nozzles; cooler/heater flanges; cyclic process equipment. | ASME B16.20 for grooved metal gaskets with covering layers; ASME B16.5 / B16.47 flange interfaces; EN 1514-6 where EN/PN flanges are specified. |
 | Metal-Jacketed / Heat-Exchanger Gasket | Seals heat exchangers, coolers and large equipment where a metallic jacket protects a resilient filler. | Thin metallic jacket around graphite or other resilient filler; single/double-jacket and ribbed configurations. | Waste-heat-recovery exchangers; lube-oil and water coolers; condensers; process heat exchangers; large equipment with pass-partition ribs. | ASME B16.20 where applicable; TEMA exchanger requirements; ASME BPVC Section VIII where the exchanger is pressure equipment; OEM 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. | Hot process equipment; special fan/blower casings; burner assemblies; equipment covers; pressure equipment and custom OEM joints. | ASME B16.20 where applicable; purchaser/OEM drawing for special geometries; ASME BPVC Section VIII if part of pressure equipment. |
 | Flexible Graphite Gasket | High-temperature static sealing with strong recovery and resistance to steam, hot air, oils and many process fluids. | Flexible/expanded graphite, with or without reinforcement or metallic insertion; flat ring or custom-cut shape. | Kiln/burner auxiliaries; steam lines; hot-air systems; valve bonnets; compressor/fan covers; heat exchangers; hot process flanges and manways. | ASME B16.21 for nonmetallic flat gaskets where applicable; EN 1514-1 for PN flanges; ASME B31.3 for associated process piping; OEM drawing for custom covers. |
 | CNAF / Compressed Fibre Gasket | General-purpose sealing for water, air, oils, low-pressure steam and plant utility services. | Compressed non-asbestos fibre sheet made from synthetic/inorganic fibres, fillers and elastomeric binder. | Process and cooling water; compressed air; lubrication skids; low-pressure steam; workshop utilities; pumps, valves and general plant piping. | ASME B16.21; EN 1514-1; purchaser/OEM material specification; ASME B31.3 at process-piping level where applicable. |
 | EPDM / NBR / SBR / Neoprene Rubber Flange Gasket | Flexible low-to-medium pressure sealing for water, cooling, oils and selected dusty/slurry service. | Full-face or ring elastomer gasket in EPDM, NBR, SBR, neoprene or reinforced rubber, selected for fluid and temperature. | Cooling-water lines; wash-water systems; lube-oil auxiliaries; dust-suppression water; pump connections; low-pressure process services and rubber-lined piping. | ASME B16.21; EN 1514-1; flange and equipment specification. Elastomer compound must be checked for oil, water, temperature and chemical compatibility. |
 | PTFE / ePTFE Flat Gasket | Chemically resistant sealing for water-treatment chemicals, additives, acids/alkalis and low-stress flanges. | Virgin/filled PTFE, restructured PTFE or expanded PTFE flat gasket. | Water treatment and dosing; laboratory/quality-control chemical systems; additive skids; selected fuel/chemical transfer; lined or corrosion-sensitive equipment interfaces. | ASME B16.21; EN 1514-1; ASME B31.3 for associated process piping. Chemical compatibility and creep/permeation requirements govern material choice. |
 | ePTFE Gasket Tape / Joint Sealant | Form-in-place sealing for large, irregular, distorted or non-standard equipment flanges and covers. | 100% expanded PTFE tape or cord compressed in place around the flange, housing or cover. | Large fan housings; mill housings; inspection covers; dust-collector housings; duct access doors; irregular large-diameter equipment joints and maintenance repairs. | Equipment/OEM drawing and assembly procedure govern; ASME PCC-1 may guide bolted-joint assembly where applicable. ASME B31.3 applies to associated piping systems. |
 | Custom Manway / Flue-Duct / Inspection-Door Gasket | Custom static sealing for access doors, manways, flue ducts and equipment covers exposed to dust, hot gas, air or utility fluids. | Custom-cut graphite, CNAF, PTFE/ePTFE or elastomeric profile selected for temperature, media, flange condition and compression. | Kiln/preheater access doors; baghouse and dust-collector doors; mill inspection covers; flue-gas duct access; fan housings; manways and maintenance covers. | OEM/purchaser drawing controls geometry. ASME B16.21 may apply only where a standard flat flange is used; ASME B31.3 may apply to connected process piping. |
 | Graphite / PTFE Compression Packing | Controls leakage around valve stems and selected pump, agitator or rotary shafts. | Preformed graphite rings or braided graphite/PTFE packing selected for shaft/stem speed, temperature and fluid. | Water and chemical pumps; valves; dosing systems; mixers; utility equipment; selected fan/rotary sealing points and maintenance applications. | Pump/valve OEM specification and FSA/ESA packing installation guidance. API 622 / ISO 15848-1 apply only where fugitive-emissions valve qualification is specified. |
 | Mechanical Seal | Controls leakage at rotating pump shafts in water, chemical, fuel and utility service. | Stationary and rotating seal faces with springs and secondary sealing elements; single/dual arrangements depending on service. | Cooling-water pumps; process-water pumps; dosing pumps; fuel-transfer auxiliaries; condensate/utility pumps; water-treatment systems. | API 682 / ISO 21049 where an API-type sealing system is specified; otherwise ISO 5199 / ISO 9905 and pump-OEM requirements may govern. |
 | Non-Metallic / Fabric Expansion Joint | Absorbs thermal growth, vibration, misalignment and movement in hot-gas, air and large-diameter duct systems. | Engineered fabric/elastomeric non-metallic flexible element with flanged or clamped ends; material system selected for temperature, dust and chemical exposure. | Kiln and preheater gas ducts; clinker-cooler ducts; ID/FD fan connections; raw/coal mill gas ducts; baghouse connections; waste-gas and air systems. | FSA fabric/non-metallic expansion-joint guidance and purchaser/OEM specification. ASTM F1123 applies where an arch-type rubber non-metallic expansion joint is used; EJMA applies to metallic bellows designs. |
 | Oil Seal / Bearing Isolator | Retains lubricant and excludes cement 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 designs. | Vertical roller mills; ball mills; crushers; conveyors; gearboxes; ID/FD fans; blowers; pumps; motors; clinker-cooler drives and rotating auxiliaries. | ISO 6194 series for rotary-shaft lip seals; equipment/OEM bearing, gearbox and shaft requirements govern bearing-isolator selection. |
 | Hydraulic Seals / V-Ring Packing | Seals hydraulic cylinders and reciprocating equipment under high load, dust exposure and pressure cycling. | Urethane/elastomer V-rings, Chevron packing, plastic-faced seals and related hydraulic sealing components. | Vertical roller mill hydraulic cylinders; roller presses; clinker-cooler drives; crusher systems; hydraulic power packs; gates, dampers and maintenance equipment. | ISO 7425-1 / 7425-2 for hydraulic-cylinder seal housings; ISO 3601 where O-rings are used; equipment/OEM hydraulic specification. |
 | Precision O-Rings / Molded Elastomer Seals | Compact static and dynamic sealing in hydraulic, pneumatic, lubrication and instrumentation systems. | Precision-molded EPDM, NBR, FKM/Viton, silicone, FFKM or specialty elastomer; backup rings may be used at higher pressure. | Hydraulic power units; pneumatic actuators; lubrication skids; instruments; valves; pumps; gearboxes; cooler systems and maintenance assemblies. | ISO 3601 series for O-ring dimensions, housings and quality acceptance; equipment/OEM material and compatibility specification governs. |
 | Pump Diaphragm | Flexible pumping barrier for chemical dosing, water treatment and contaminated or solids-bearing liquids. | ePTFE wetted face bonded to reinforced elastomer backing, or other OEM-specific PTFE/elastomer diaphragm construction. | Chemical dosing; water-treatment reagents; laboratory/process additives; slurry or contaminated-liquid transfer; metering and utility 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. | Lube-oil cooling; hydraulic-oil cooling; process-water heat recovery; compressor cooling; auxiliary cooling loops and water-treatment systems. | Heat-exchanger OEM drawing/specification controls geometry and compression. ISO 3601 does not apply to proprietary plate profiles; elastomer compound is selected to fluid and temperature requirements. |
| PTFE Envelope Gasket | Provides a chemically inert wetted surface with a compressible core for aggressive cleaning and dosing chemicals. | PTFE envelope around compressed non-asbestos fibre or flexible graphite core; standard or custom geometry. | Water-treatment chemical skids; acids/caustics; laboratory/process dosing; corrosion-sensitive equipment and selected filter applications. | ASME B16.21 where standard flat-gasket dimensions apply; EN 1514-1 for compatible PN flanges; equipment/OEM drawing for non-standard geometry. |
 | High-Temperature Textile / Ceramic-Fiber Rope Seal | Flexible sealing for very hot access doors, kiln/hood interfaces and hot-gas equipment where a compressible textile seal is used. | Braided or woven high-temperature fibre rope/tape, potentially ceramic, silica, glass or other OEM-specified high-temperature textile material. | Kiln hood and burner access; hot inspection doors; clinker-cooler access; preheater/calciner doors; selected hot-gas duct and furnace-style interfaces. | Equipment/OEM drawing and temperature/fire specification govern. There is no single universal ASME gasket dimensional standard for these proprietary textile door/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
- Above about 450 °C in air, flexible graphite oxidises. For kiln and cooler hot gas, ask us about ceramic fillers.
- Send duct flange drawings with bolt-hole positions. Most cement duct gaskets are made to order, not taken from stock.
- Abrasive dust wears soft gaskets at the bore. Keep the gasket inner edge flush with the duct wall.
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