Power Generation Gaskets.
Cannon Gasket cuts power generation gaskets under ISO 9001 systems. Large-format flatbed presses plus waterjet handle manway-sized parts. Send flange drawings, service temperature, and operating pressure. We return material picks, tooling cost, pricing, and ship lead time.
- Seals the hot flanges: manways, turbine casings, generator enclosures, boiler doors, and flue-gas ducts inside a running power plant.
- Utility steam plants, gas-turbine peaker units, cogeneration and combined-heat-and-power plants, and large industrial generation all run them.
- Stock options include flexible graphite, compressed non-asbestos fiber, Nomex paper, Klingersil, and high-temperature fluoroelastomer.
Request a quote for power-gen gaskets.
Why utility and turbine flanges break ordinary gaskets
Utility and cogeneration plants run sealing interfaces at temperature, pressure, and thermal-cycle combinations that would destroy ordinary elastomer or fiber gaskets within a single outage. A turbine casing flange might operate at 900°F and 1,800 psi; a boiler drum manway sits at 700°F and 1,500 psi; a flue-gas expansion joint sees the same thermal range with a fraction of the bolt load. The right gasket is the one that matches the specific temperature, pressure, chemistry, and creep- relaxation behaviour of the service, not a generic industrial spec.
Cannon Gasket supplies die-cut and fabricated gaskets for power plant maintenance contractors, turbine and boiler OEMs, and cogeneration operators. We work in graphite (flexible and laminated), Klingersil®, non-asbestos compressed fiber, spiral-wound components (sourced), Nomex®paper for electrical applications, and high-temperature fluoroelastomers for lower-temperature auxiliary service.
Materials that hold at utility-plant temperatures
Power-generation gasket selection is driven almost entirely by continuous operating temperature. Above about 500°F, elastomer grades drop out and you are choosing between compressed fiber, graphite, and spiral-wound. Below 500°F auxiliary service sees more conventional rubber compounds.
- Flexible graphite is the default for high-pressure steam flanges, turbine bleed lines, and boiler manways. -400°F to +1000°F continuous, chemically inert across most process streams, fire- safe under blow-out conditions. Available with stainless steel insertion layers for higher bolt load.
- Klingersil® is the modern compressed-fiber flange gasket for steam, water, and moderate-chemistry lines up to about +750°F. Specified across virtually every utility-plant flange category for its consistent compression, high bolt-load tolerance, and broad chemical compatibility.
- Non-asbestos fiber is a drop-in replacement for asbestos-era gaskets in legacy plant infrastructure. Multiple grades for water, steam, oil, and chemical service up to +700°F.
- Nomex® paper is high-temperature aramid paper for generator winding insulation, transformer gaskets, motor laminations, and switchgear. Dielectric strength in the 400-500°F continuous range.
- Fluorosilicone is used for lower-temperature auxiliary systems where hydraulic oil or lubricant contact is present along with elevated temperature. Common in gas-turbine fuel system fittings.
- Spiral-wound gaskets are the standard for critical-service pipe flanges (ASME B16.20). Cannon Gasket can source spiral-wound components as part of a larger gasket kit, though we die-cut rather than manufacture the spiral wind ourselves.
How power-plant gaskets fail under cycling
- Creep relaxation under thermal cycling. Every start-stop cycle loosens bolted joints. Compressed-fiber gaskets lose seating stress over hundreds of cycles and start leaking. Specify a graphite or Klingersil grade with lower creep characteristics for peaking plants that cycle daily.
- High-temperature chemical attack. Combustion byproducts (SO2, NOx, acidic condensate) can degrade organic-binder gaskets. Graphite and non-asbestos-mineral grades resist this better than elastomer-bound fiber sheets.
- Blow-out under high-pressure transient. An unsupported soft gasket on a large-diameter high-pressure flange can extrude or blow out. Specify a gasket with metal insertion or step up to spiral-wound for safety-critical service.
- Electrical breakdown in generator insulation. Generator winding insulation that degrades thermally loses dielectric strength and arcs. Specify Nomex-grade aramid with appropriate thermal class (H, 180°C and above) for continuous-service generators.
Turbine, boiler, and duct gasket profiles
Power-gen gaskets span a wide range of profiles: ring and full- face flange gaskets for pipe work; large-diameter manway and drum gaskets up to several feet across; shaped gaskets for turbine casings and boiler access covers; die-cut insulation gaskets for generator laminations and transformer stacks; and custom-profile duct / expansion-joint gaskets for flue-gas service. Cannon Gasket die-cuts and waterjet-cuts these from sheet stock and laminates up through multi-foot diameters.
ASME codes for power-generation sealing
Power-generation gasket specifications commonly reference ASME B16.20 (metallic gaskets for pipe flanges), ASME B16.21 (non-metallic gaskets for pipe flanges), and customer-specific plant quality standards. ASME Section I (power boilers) and Section VIII (pressure vessels) govern pressure-boundary applications. Cannon Gasket does not carry nuclear (10 CFR 50 Appendix B / NQA-1) certification; if your application requires nuclear-grade documentation, we will refer you to a certified supplier. For conventional utility, industrial, and cogeneration work, our ISO 9001 quality system and sourced spiral-wound components cover the full commercial spec range.
For a broader material decision framework, see our gasket material selection guide.
Materials Cannon Gasket supplies for power generation
Industries adjacent to power-gen sealing
Power-generation work overlaps our oil & gas and industrial programs, sharing the same high-temperature material inventory, same ASME flange geometries, same quality documentation expectations.