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Gaskets for oil refineries
Refineries run crude and vacuum units, hydroprocessing reactors and catalytic crackers at high temperature, often with hydrogen, sulfur compounds and frequent thermal cycling. Each flange needs a gasket that keeps its load through start-ups, shutdowns and turnarounds. We supply QGER gaskets for every refinery unit, from tank farm piping to hydrocracker reactors.
Request a quoteWhere our gaskets are used
| Representative image | Gasket / seal | Refining use | Typical construction | Refinery applications | Typical standards / specifications |
|---|---|---|---|---|---|
 | Spiral Wound Gasket - QSW4 | High-pressure raised-face sealing with strong recovery and an inner ring to prevent winding extrusion/buckling. | Profiled metal winding with graphite, PTFE or mica filler plus metallic inner and outer rings. | Hydrotreaters and hydrocrackers; hydrogen-rich process piping; high-pressure reactor circuits; high-class refinery flanges; pressure vessels. | ASME B16.20; ASME B16.5 / B16.47 mating flanges; ASME B31.3 process piping. Project piping class controls winding alloy and filler. |
| Spiral Wound Gasket - QSW3 | General refinery process-piping flange sealing with centering and compression control. | Profiled metal winding with graphite or other filler and a metallic outer centering/compression ring. | Crude and vacuum distillation; FCC and reforming auxiliaries; steam, cooling water and hydrocarbon lines; typical Class 150-600 raised-face piping. | ASME B16.20; ASME B16.5 / B16.47; ASME B31.3 at piping-system level. |
 | Camprofile / Kammprofile Gasket | Severe-service flange and exchanger sealing with high recovery under temperature, pressure and cyclic load changes. | Grooved metallic core with graphite or PTFE covering layers; optional fixed or floating guide ring. | Crude preheat trains; hydroprocessing exchangers; high-temperature process equipment; vessel flanges; repeated shutdown/startup service. | ASME B16.20 for grooved metal gaskets with covering layers; ASME B16.5 / B16.47; API 660 / TEMA where applied to shell-and-tube heat exchangers. |
 | Metal-Jacketed / Heat-Exchanger Gasket | Large or complex exchanger sealing where a metallic shell protects a resilient filler. | Thin metallic jacket enclosing graphite or other filler; single/double jacket, corrugated and ribbed configurations. | Crude-unit preheat exchangers; overhead condensers; reboilers; hydrotreater exchangers; amine/sour-water exchangers; coolers and condensers. | ASME B16.20 for standard metal-jacketed gaskets; API 660 / TEMA exchanger specification; ASME BPVC Section VIII for pressure-vessel/exchanger design. |
 | Ring Type Joint (RTJ) - R / RX / BX | Metal-to-metal sealing for very high pressure and temperature ring-joint connections. | Precision-machined metallic ring seated in a matching ring groove; R, RX and BX profiles in carbon, alloy or stainless steels. | High-pressure hydroprocessing and hydrogen service; compressor discharge; specialty reactor/piping flanges; high-pressure valves and process equipment where RTJ flanges are specified. | ASME B16.20; ASME B16.5 / B16.47 for applicable refinery flanges; API 6A / ISO 10423 only where API-type ring-joint interfaces are specified. |
 | Solid Metal / Metal-Core Gasket | Extreme pressure/temperature sealing where conventional soft gasket materials are not suitable. | Solid metallic gasket or rigid metal core, optionally faced with expanded graphite or ePTFE. | Reactor and vessel covers; compressor/turbine cases; high-temperature furnace/heater auxiliaries; special OEM joints and custom flanges. | ASME B16.20 where applicable; purchaser/OEM drawing for special shapes; ASME BPVC Section VIII when part of pressure equipment. |
 | Flexible Graphite Gasket | High-temperature hydrocarbon, steam and thermal-process sealing with strong recovery and chemical resistance. | Flexible/expanded graphite, with or without reinforcement or metal insertion; flat ring or custom-cut shape. | Fired-heater and furnace auxiliaries; steam lines; hot-oil systems; valve bonnet joints; manways; pump/compressor covers; hot process flanges. | ASME B16.21 for nonmetallic flat gaskets; ASME B16.5 / B16.47 interfaces; ASME B31.3 process piping; equipment/OEM drawing for nonstandard shapes. |
 | Graphite Pressure-Seal / Cover-Seal Ring | Self-energizing sealing for pressure-seal valve bonnets and selected high-pressure covers that experience large thermal cycles. | Preformed high-density flexible graphite ring, sometimes with metallic anti-extrusion components depending on valve/OEM design. | High-pressure refinery valves; steam and boiler-feed auxiliaries within refinery utilities; severe cyclic bonnet/cover sealing. | ASME B16.34 and valve/OEM specification for pressure-containing valve assemblies; API 624 / ISO 15848-1 may apply to fugitive-emissions qualification of applicable valves. |
 | PTFE / ePTFE Flat Gasket | Chemically resistant, low-stress sealing for aggressive refinery chemicals and corrosion-sensitive flanges. | Virgin/filled PTFE, restructured PTFE or expanded PTFE sheet gasket. | Caustic and chemical-treatment systems; amine-related auxiliaries; water-treatment chemicals; alkylation/support services subject to exact chemical-compatibility review; low bolt-load equipment. | ASME B16.21; EN 1514-1 where PN flanges are used; ASME B31.3 at system level. Chemical-compatibility and temperature limits govern material selection. |
| PTFE Envelope Gasket | Chemically resistant sealing where a soft compressible core is needed beneath a PTFE process-contact surface. | PTFE envelope around compressed non-asbestos fibre or flexible graphite core. | Chemical injection/dosing; acid/caustic service; glass-lined or corrosion-sensitive equipment; specialty filter and process-piping joints. | ASME B16.21 where dimensional scope applies; EN 1514-1 for compatible PN flanges; ASME B31.3 and equipment/vendor specifications govern service suitability. |
 | CNAF / Rubber / General Non-Metallic Gasket | Low-to-medium pressure sealing for water, oil, fuel, air and utility services where the selected sheet/elastomer is compatible. | Compressed non-asbestos fibre, NBR, EPDM, neoprene, FKM/Viton, silicone or reinforced rubber cut as ring or full-face gasket. | Cooling water; firewater; lube-oil systems; air; low-pressure utility hydrocarbons where approved; workshop and auxiliary skids. | ASME B16.21; EN 1514-1 for PN flanges; ASME B31.3. Purchaser material specification governs oil/fuel/chemical compatibility. |
 | ePTFE Joint Sealant / Gasket Tape | Form-in-place sealing for large, non-standard, irregular or lightly damaged equipment flanges. | 100% expanded PTFE cord/tape applied continuously around the sealing surface to form a conformable gasket. | Tank manways; large equipment covers; ductwork; large steel flanges; chemical service; maintenance situations where custom sheet cutting is difficult. | Equipment/purchaser drawing and ASME B31.3 where part of process piping; ASME PCC-1 practices may govern bolted flange-joint assembly. Not a dimensional substitute for ASME B16.20/B16.21 standard gaskets. |
 | Flange Insulation Kit / Insulating Gasket | Electrical isolation of flanged joints to support cathodic protection and limit galvanic current paths. | High-strength insulating gasket plus full-length sleeves, insulating washers and steel washers. | Tank farms; refinery-to-terminal lines; buried piping; cathodically protected transfer lines; isolation points at plant boundaries and dissimilar-metal interfaces. | AMPP/NACE SP0286 for electrical isolation of cathodically protected pipelines; ASME B16.5 / B16.47 or relevant flange standard; project corrosion-control specification. |
| Graphite / PTFE Compression Packing | Dynamic/static sealing around valve stems and selected pump/reciprocating shafts, with fugitive-emissions control as a key refinery concern. | Preformed graphite rings or braided graphite/PTFE packing sets selected by media, temperature, stem/shaft and emissions requirements. | Process valves; isolation and control valves; pump stuffing boxes; crude, hydroprocessing, FCC, sulfur-recovery, amine and utility units. | API 622 for process-valve packing type testing; API 624 for rising-stem valves with graphite packing; API 641 for quarter-turn valves where applicable; ISO 15848-1 for valve fugitive emissions. |
 | Mechanical Seal | Controls leakage at rotating process-pump shafts in hydrocarbon, sour-water, chemical and utility service. | Precision stationary/rotating faces with springs, secondary seals and single/dual seal arrangements selected by duty. | API process pumps; crude and product transfer; hydrocarbon services; amine/sour-water pumps; chemical dosing; cooling and utility pumps. | API 682 / ISO 21049 for pump shaft-sealing systems; API 610 / ISO 13709 for associated refinery centrifugal pumps; purchaser seal plan/material requirements. |
 | Expansion Joint / Flexible Coupling | Absorbs thermal movement, vibration, pressure surges and misalignment in piping and duct systems. | Engineered non-metallic/fabric or elastomeric flexible joint; metallic bellows may be used in other designs. | FCC/flue-gas and utility ducting where suitable; blower/fan connections; cooling-water piping; pump discharge; chemical-processing and utility systems. | ASME B31.3 at piping-system level; FSA guidance and purchaser specification for non-metallic expansion joints; EJMA standards where metallic bellows are used. |
 | Oil Seal / Bearing Isolator | Retains lubricant and excludes contaminants at rotating shafts and bearing housings. | Elastomeric radial shaft lip seal or non-contact labyrinth bearing isolator; solid or split configurations. | Pumps; compressors; fans; motors; gearboxes; lube-oil systems; rotating auxiliaries in refinery process and utility units. | ISO 6194 series for rotary shaft lip seals; API 610 / API 617 / API 614 equipment requirements as applicable; OEM bearing and lube-system specifications. |
 | O-Rings / Hydraulic & Elastomeric Seals | Compact sealing in valve actuators, instrumentation, hydraulic controls, analyzers and equipment auxiliaries. | Precision-molded elastomer/polymer seals including O-rings, V-rings and engineered profiles; FKM/FFKM/NBR/EPDM-type compounds selected by media. | Valve actuators; instrument fittings; analyzer systems; hydraulic power units; pumps/compressors auxiliaries; utility equipment. | ISO 3601 for O-rings; ISO 7425 for hydraulic-cylinder seal housings. Equipment/OEM chemical-compatibility specification governs. Sour refinery metallic components may additionally invoke ISO 17945 / NACE MR0103 at system/material level. |
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 fired heater and FCC hot service, ask us about ceramic or mica fillers.
- For hydrogen and sour service, state the hydrogen partial pressure and H₂S content so we can confirm metals and hardness.
- Turnarounds need many gaskets at once. Send your flange list early so manufacturing starts before the shutdown.
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