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Gaskets for power plants
Gas turbine, steam and combined-cycle plants put gaskets through high-temperature steam, fast load changes and frequent start-ups. Each unplanned outage costs far more than the gasket. We supply sealing products for the steam cycle, turbine auxiliaries, cooling water and flue gas systems.
Request a quoteWhere our gaskets are used
| Representative image | Gasket / seal | Power-plant use | Typical construction | Power-plant applications | Typical standards / specifications |
|---|---|---|---|---|---|
 | Spiral Wound Gasket (QSW3 / QSW4) | Primary sealing for high-pressure and high-temperature steam, feedwater and process flanges. | Profiled metal winding with graphite, PTFE or mica filler; QSW3 outer ring or QSW4 inner and outer rings. | Main and reheat steam piping; boiler external piping; HRSG systems; high-pressure feedwater; gas-turbine auxiliary process piping. | ASME B16.20; mating flanges ASME B16.5 / B16.47; ASME B31.1 at piping-system level. ASME BPVC Section I applies to power boilers and certain boiler-external piping. |
 | Camprofile / Kammprofile Gasket | Severe-service sealing where pressure, temperature cycling or limited bolt load demands high recovery. | Grooved metal core with graphite or PTFE soft facing; guide ring or floating ring depending on flange arrangement. | Steam turbine and boiler auxiliaries; high-pressure heat exchangers; feedwater heaters; pressure vessels; large flanged connections. | ASME B16.20 for grooved metal gaskets with covering layers; ASME B16.5 / B16.47 flange interfaces; ASME B31.1 system requirements. |
 | Metal-Jacketed / Heat-Exchanger Gasket | Seals large heat exchangers, condensers and heaters under elevated pressure, temperature and corrosion exposure. | Thin metallic outer jacket enclosing graphite or other resilient filler; ribs can be added for exchanger pass partitions. | Feedwater heaters; surface condensers; lube-oil coolers; closed cooling-water exchangers; air/gas coolers; cogeneration heat recovery. | ASME B16.20 where applicable; TEMA heat-exchanger requirements and equipment drawing; ASME BPVC Section VIII where the exchanger is a pressure vessel. |
 | Solid Metal / Metal-Core Turbine Casing Gasket | High-temperature rigid sealing for turbine casings and specialty equipment where conventional soft gaskets are unsuitable. | Solid metal or metal core; optional high-purity graphite or expanded PTFE facing depending on service. | Steam-turbine casing joints; turbine stop/control-valve joints; high-temperature equipment; custom compressor and pressure-equipment joints. | Turbine/OEM drawing and material specification normally govern. ASME B16.20 where the gasket geometry falls within its scope; ASME B31.1 at connected power-piping interfaces. |
 | Flexible Graphite Flat Gasket | High-temperature sealing with strong thermal stability for steam, condensate and hot utility services. | Flexible/expanded graphite, with or without reinforcement or metal insertion. | Steam and condensate piping; boiler auxiliaries; hot valves; gland and bonnet joints; low- to medium-pressure steam systems. | ASME B16.21 for nonmetallic flat gaskets; EN 1514-1 where PN flanges are used; ASME B31.1 at piping-system level. |
 | Graphite Pressure-Seal / Cover-Seal Ring | Self-energizing sealing in high-pressure valve covers and pressure-seal equipment under repeated temperature cycling. | Preformed high-density graphite ring; geometry and density selected to the valve or vessel cover design. | Main steam valves; high-pressure feedwater valves; pressure-seal bonnets; feedwater preheaters and other self-sealing covers. | ASME B16.34 and valve/OEM specification for pressure-containing valve assemblies; ASME B31.1 system requirements. Customer drawing controls ring dimensions. |
 | Boiler Manway / Handhole Gasket | Provides reliable access-cover sealing on boilers, drums and pressure vessels during repeated maintenance cycles. | Flexible graphite, spiral-wound, corrugated metal or metal-jacketed construction selected to cover geometry and service. | Boiler drums; deaerators; feedwater tanks; pressure vessels; HRSG access covers; steam-system manways and handholes. | ASME BPVC Section I for power boilers; ASME BPVC Section VIII for applicable pressure vessels; equipment-OEM drawing and cover geometry govern gasket design. |
 | Ring Type Joint (RTJ) | Metal-to-metal sealing for selected very-high-pressure fuel-gas and specialty process flanges. | Precision-machined R, RX or BX metallic ring in carbon, alloy or stainless steel. | High-pressure fuel-gas skids; gas-turbine fuel systems; specialty high-pressure valves and process piping where RTJ flanges are specified. | ASME B16.20; ASME B16.5 / B16.47 where applicable. API 6A / ISO 10423 only when oil-and-gas type wellhead/flange systems are actually specified. |
 | PTFE / ePTFE Gasket | Chemical-resistant sealing for water treatment, demineralization, dosing and corrosive auxiliary systems. | Virgin/filled PTFE, restructured PTFE, PTFE envelope or expanded PTFE. | DM-water treatment; acid/caustic dosing; condensate polishing; chemical cleaning; chlorination; auxiliary chemical systems. | ASME B16.21; EN 1514-1 where PN flanges are used; equipment and chemical-compatibility specifications also govern. |
 | EPDM / NBR / FKM Rubber Gasket | Water, oil and general utility sealing at low to medium pressure. | Cut or molded elastomeric gasket; full-face or ring form; reinforced grades where needed. | Cooling-water systems; service water; fire water; lube-oil auxiliaries; HVAC/chilled-water systems; low-pressure pump and valve flanges. | ASME B16.21; EN 1514-1; equipment/piping material specification. Water-service compound approval may be required by the plant owner. |
 | Transformer Tank / Conservator Gasket | Prevents insulating-oil leakage and moisture ingress at transformer tanks, covers, bushings and conservators. | Oil-resistant NBR/FKM/elastomeric flat or molded gasket, normally made to transformer OEM geometry. | Main step-up transformers; auxiliary transformers; conservators; bushing flanges; inspection covers and oil-system joints. | IEC 60076 series and/or IEEE C57.12.00 at equipment level; transformer-OEM drawing and insulating-oil compatibility specification govern the gasket itself. |
 | Precision O-Rings / Molded Elastomer Seals | Compact static and dynamic sealing in instruments, actuators, pumps and auxiliary systems. | Precision-molded EPDM, NBR, FKM, silicone or specialty elastomer. | Valve actuators; hydraulic controls; cooling-water pumps; fuel-gas auxiliaries; instruments; lubrication and seal-oil systems. | ISO 3601 series for O-ring dimensions, tolerances and quality; SAE AS568 may apply to inch-series sizes; equipment-OEM specification governs compound. |
| Graphite / PTFE Compression Packing | Controls leakage around valve stems and rotating or reciprocating shafts. | Braided graphite or PTFE fibre packing; preformed graphite rings for severe valve service. | Main steam and feedwater valves; boiler valves; condensate systems; chemical-treatment pumps; cooling-water and auxiliary pumps. | API 622 and API 624 or ISO 15848-1 where fugitive-emissions qualification is specified; otherwise valve/pump OEM specification and packing installation guidance. |
 | Mechanical Seal | Controls leakage around high-speed rotating pump shafts. | Precision stationary and rotating faces with springs and secondary sealing elements; cartridge designs common in critical pumps. | Boiler-feed pumps; condensate extraction pumps; cooling-water pumps; chemical pumps; fuel-oil pumps; service-water pumps. | API 682 / ISO 21049 for pump shaft-sealing systems where specified; API 610 / ISO 13709 for applicable centrifugal pumps; pump-OEM specification governs. |
 | Expansion Joint | Absorbs thermal movement, vibration, settlement, pumping surges and misalignment in piping and duct systems. | Elastomeric/fabric nonmetallic expansion joint or metallic bellows depending on temperature, pressure and media. | Flue-gas ducts; cooling-water piping; pump suction/discharge; turbine/boiler auxiliaries; air systems; exhaust and large-diameter ducting. | ASTM F1123 for arch-type non-metallic expansion joints; EJMA Standards for metallic bellows; ASME B31.1 at piping-system level. |
 | Oil Seal / Bearing Isolator | Protects rotating shafts and bearings from lubricant loss and contaminant ingress. | Elastomeric radial shaft lip seal or non-contact labyrinth-style bearing isolator. | Pumps; fans; gearboxes; coal/biomass handling drives; cooling-tower equipment; auxiliary motors and rotating machinery. | ISO 6194 series for rotary-shaft lip seals; equipment-OEM specification. API 610 / ISO 13709 may apply to bearing arrangements on specified process pumps. |
 | Hydraulic Seals / V-Ring Packing | Seals hydraulic cylinders, actuators and reciprocating control equipment. | Urethane/elastomer V-rings, Chevron packing, O-rings and engineered hydraulic seals. | Steam-turbine control actuators; damper drives; valve actuators; coal/ash handling hydraulics; maintenance equipment. | ISO 7425-1/-2 for hydraulic-cylinder seal housings; ISO 3601 where O-rings are used; actuator/equipment-OEM specification. |
 | Plate Heat-Exchanger Gasket | Seals individual plates and separates cooling, oil and water circuits in gasketed plate heat exchangers. | Molded EPDM, NBR or FKM perimeter gasket, clipped or bonded to the plate depending on exchanger design. | Closed cooling-water systems; lube-oil cooling; generator cooling; auxiliary heat recovery; HVAC/chilled-water systems. | Heat-exchanger OEM drawing/specification governs geometry and compound; ISO 3601 does not apply to formed plate-HX gaskets. Material standards such as EN 681-1 may be relevant for some water-service elastomers. |
These are typical starting points. Final selection depends on your service conditions and is confirmed with QGER engineering before manufacture.
Points to watch
- Steam flanges cycle between cold and hot. Spiral wound and camprofile gaskets recover better than flat sheet gaskets when bolts relax.
- Above about 450 °C in air, graphite oxidises. On hot external flanges, ask us about ceramic or other high-temperature fillers.
- Plan gasket stock before outages. Send us your flange list early: manufacturing can start within 24 hours of order.
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