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Gaskets for marine and shipbuilding
Ships, LNG carriers and offshore units pack seawater, fuel, steam, cryogenic and exhaust systems into tight spaces, and repairs at sea are difficult. We supply gaskets for newbuilds and dry-dock repairs, matched to the flange standard the yard uses.
Request a quoteWhere our gaskets are used
| Representative image | Gasket / seal | Marine / shipbuilding use | Typical construction | Representative marine / shipbuilding applications | Typical standards / specifications |
|---|---|---|---|---|---|
 | Spiral Wound Gasket (QSW3 / QSW4) | High-pressure and high-temperature flange sealing in machinery-space and cargo/process piping. | Profiled stainless or alloy winding with graphite, PTFE or mica filler; QSW3 outer ring or QSW4 inner and outer rings. | Steam and boiler lines; fuel/lube oil systems; LNG/LPG fuel-gas skids; cargo/process piping; exhaust-gas treatment auxiliaries; high-pressure shipboard flanges. | ASME B16.20; ASME B16.5/B16.47 for matching flanges. EN 1514-2 where EN/PN flanges are used. Shipyard/class-society piping specification also governs. |
 | Camprofile / Kammprofile Gasket | Reliable flange and exchanger sealing under thermal cycling, vibration and high bolt-load variation. | Grooved metal core with graphite or PTFE facing; with or without guide ring. | Main/auxiliary engine coolers; steam systems; fuel treatment; exhaust-gas systems; LNG/LPG process skids; shell-and-tube exchangers. | ASME B16.20 for grooved metal gaskets with covering layers; EN 1514-6 for PN flange systems; ASME B16.5/B16.47 or shipyard flange standard. |
 | Metal-Jacketed / Heat-Exchanger Gasket | Seals shell-and-tube heat exchangers, condensers and coolers exposed to pressure, temperature and corrosive fluids. | Thin metal jacket enclosing graphite or other resilient filler; ribs may be incorporated for pass partitions. | Jacket-water coolers; lube-oil coolers; charge-air coolers; condensers; fuel heaters; freshwater generators; cargo heating/cooling systems. | TEMA requirements and exchanger maker drawing/specification; ASME BPVC Section VIII where code pressure vessels apply; ASME B16.20 where dimensional scope is relevant. |
 | Solid Metal / Marine Engine Exhaust Gasket | Seals high-temperature exhaust connections where soft gasket materials may creep or burn. | Solid metal, corrugated metal, metal-core with graphite facing, or custom jacketed construction to engine drawing. | Main and auxiliary diesel engine exhaust manifolds; turbocharger flanges; exhaust-gas economizers; SCR/EGR and waste-heat recovery connections. | Engine/OEM drawing and classification-society machinery rules govern. ASME B16.20 may apply to standardized metallic flange gasket forms. |
 | Ring Type Joint (RTJ) | Metal-to-metal sealing for very high pressure/high temperature marine and offshore process systems. | Precision-machined R, RX or BX metal ring in carbon, alloy or stainless steel. | FPSO/FSO process modules; LNG/LPG terminals and fuel-gas skids; offshore service vessels; high-pressure hydrocarbon or gas systems where ring-joint flanges are specified. | ASME B16.20; API 6A / ISO 10423 for wellhead/offshore equipment where applicable. Ship/class project specification governs marine installation. |
 | Flexible Graphite Gasket | High-temperature sealing with strong resilience under thermal cycling and vibration. | Flexible/expanded graphite, with or without metal insertion or reinforcement. | Steam lines; boiler systems; exhaust systems; hot valves; heat exchangers; incinerator and waste-heat systems. | ASME B16.21 for nonmetallic flat gaskets; EN 1514-1 for PN flanges; OEM/class material and fire-safety requirements where applicable. |
 | CNAF / Compressed Fibre Gasket | General-purpose flat sealing for water, oil, air and moderate-temperature machinery systems. | Compressed non-asbestos fibre with synthetic/inorganic fibres, fillers and elastomeric binder. | Cooling-water, ballast and bilge lines; lube/fuel oil auxiliaries; compressed air; HVAC/chilled water; service-water and general ship piping. | ASME B16.21; EN 1514-1; ASTM F104 material classification may be referenced. Final service fluid and class/shipyard specification govern. |
 | PTFE / ePTFE Gasket | Chemically resistant sealing for aggressive media and contamination-sensitive ship systems. | Virgin/filled PTFE, restructured PTFE, PTFE envelope or expanded PTFE. | Chemical/product tankers; scrubber treatment systems; ballast-water treatment; potable water; acids/caustics; LNG/LPG auxiliary chemical systems. | ASME B16.21; EN 1514-1. Chemical compatibility and cargo-system/class requirements govern; potable-water approvals may apply where required. |
 | EPDM / NBR / FKM / Neoprene Rubber Gasket | Low-to-medium pressure sealing for seawater, fresh water, fuel/oil and utility systems. | Cut or molded elastomeric full-face/ring gasket; reinforcement may be added. | Seawater cooling; ballast/bilge; freshwater/potable water; fuel transfer; HVAC/chilled water; sanitary and deck-service piping. | ASME B16.21; EN 1514-1; ISO 4633/EN 681-1 for water-service elastomers where applicable. Material must match seawater, fuel or oil duty. |
 | Plate Heat-Exchanger Gasket | Separates and seals fluid circuits in compact plate heat exchangers widely used aboard ships. | Molded EPDM, NBR or FKM perimeter gasket, clipped or bonded to the plate. | Central cooling systems; freshwater generators; lube-oil coolers; HVAC; fuel heaters; auxiliary cooling and heat recovery. | Heat-exchanger OEM drawing/specification governs geometry and compound. ISO 4633/EN 681-1 may apply to water-service elastomers; class approval may be required. |
 | Hatch-Cover / Watertight-Door Rubber Seal | Provides weather- or watertight sealing at cargo hatch covers, access doors and closures. | Extruded or molded neoprene/EPDM/SBR bulb, channel or sponge-rubber profile. | Bulk-carrier hatch covers; deck access hatches; watertight/weathertight doors; lockers and marine closures. | IMO Load Line/SOLAS closure requirements and applicable classification-society rules. IACS UR S21 applies to hatch-cover structural evaluation; seal profile is normally to hatch/door OEM drawing. |
 | Precision O-Rings / Molded Elastomer Seals | Compact static and dynamic sealing in hydraulic, fuel, cooling and pneumatic systems. | Precision-molded NBR, FKM, EPDM, silicone or specialty elastomers. | Fuel and lube systems; hydraulic steering; deck machinery; refrigeration; pumps/valves; pneumatic controls; water-treatment equipment. | ISO 3601 series for O-ring dimensions, tolerances and quality; SAE AS568 may be used for inch-series sizes. Equipment OEM/class requirements govern compound. |
 | Graphite / PTFE Compression Packing | Controls leakage around valve stems and pump shafts in marine machinery systems. | Braided graphite or PTFE fibre packing; preformed graphite rings for selected valves. | Seawater pumps; ballast/bilge pumps; valves; steam systems; cargo pumps; chemical-duty pumps; deck machinery auxiliaries. | Valve/pump OEM specification. API 622 and ISO 15848-1 may be used for low-emission valve service where specified; FSA/ESA packing guidance is also relevant. |
 | Mechanical Seal | Controls leakage around rotating pump and compressor shafts. | Precision stationary/rotating seal faces with springs and secondary elastomer seals. | Seawater cooling pumps; ballast/bilge pumps; cargo pumps; fuel/lube pumps; freshwater pumps; scrubber and treatment systems. | Pump/maker and classification-society specifications govern. API 682 / ISO 21049 and API 610 / ISO 13709 may be specified for process-style marine/offshore pumps. |
 | Oil Seal / Bearing Isolator | Protects shafts, bearings and gearboxes from lubricant loss and contaminant ingress. | Elastomeric radial lip seal or non-contact labyrinth-style bearing isolator. | Main/auxiliary gearboxes; pumps; electric motors; thrusters; deck machinery; generators and auxiliary rotating equipment. | ISO 6194 series for rotary-shaft lip seals; equipment OEM and class requirements govern bearing-isolation arrangements. |
 | Hydraulic Seals / V-Ring Packing | Seals hydraulic cylinders, actuators and reciprocating equipment. | Urethane/elastomer V-rings, Chevron packing, O-rings and engineered hydraulic seals. | Steering gear; hatch-cover hydraulics; cranes; winches; stabilizers; ramps; deck machinery; thruster controls. | ISO 7425-1/-2 for hydraulic-cylinder seal housings; ISO 3601 where O-rings are used; machinery OEM and classification-society requirements. |
 | Expansion Joint / Marine Compensator | Absorbs thermal movement, vibration, pumping surge and misalignment in ship piping and exhaust systems. | Elastomeric/fabric non-metallic joint or flexible coupling with flanged ends; material selected for media and fire exposure. | Engine exhaust; seawater cooling; pump connections; ballast/bilge; HVAC; scrubber systems; auxiliary/process piping. | ASTM F1123 for non-metallic expansion joints; ISO 15540/ISO 15541 for fire-resistance testing of non-metallic compensators where applicable; class/shipyard rules govern installation. |
 | Flange Insulation Kit / Insulating Gasket | Electrically isolates flanged joints and helps control galvanic/cathodic corrosion. | Insulating gasket with sleeves, insulating washers and steel washers. | Ballast/seawater systems; offshore/ship-to-shore fuel piping; mixed-metal piping; cathodically protected marine terminals and offshore systems. | AMPP/NACE SP0286 where cathodic isolation is required; ASME B16.5/B16.47 or EN/ISO flange dimensions; vessel/project corrosion-control specification. |
 | Gasketed Mechanical-Coupling Seal | Provides flexible, detachable pipe joints that tolerate limited movement and vibration in shipboard piping. | Molded elastomeric coupling gasket retained within grooved, compression or restraint-type mechanical coupling. | Ballast, bilge, fire-main, cooling-water, sanitary and other approved shipboard piping systems. | ISO 15837 for gasketed mechanical couplings used in ship piping; ISO 15838 for fittings used with such couplings. Classification-society approval and coupling-maker specification govern. |
These are typical starting points. Final selection depends on your service conditions and is confirmed with QGER engineering before manufacture.
Points to watch
- Many yards use JIS or DIN flanges. State the flange standard on every enquiry.
- Cryogenic service needs metals that stay tough at low temperature, such as 304 or 316L stainless steel. Carbon steel becomes brittle.
- Seawater systems often join steel, bronze and titanium. Insulation kits prevent galvanic corrosion at those joints.
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