Oil, Gas & Petrochemical Gaskets & Seals
Application-led gasket selection for upstream production, pipelines, refineries, petrochemical plants, and cryogenic LNG service.
Oil and gas joints require the exact pressure-temperature envelope, medium, flange, bolting, cycling, fire or emissions duty, and project specification. We use those inputs to identify the required gasket construction and evidence package.
Wellheads, Christmas Trees & Production
API 6A wellhead and Christmas tree connections may use R, RX, or BX ring joint gaskets. The exact pressure and temperature class, groove, dimensions, surface finish, material, product specification level, and performance requirement must come from the equipment and project documentation.
Sour production service needs a materials review against ANSI/NACE MR0175 / ISO 15156. Acceptability depends on the standard part, H₂S partial pressure, pH, chlorides, temperature, product form, heat treatment, hardness, and cold work. No alloy name is intrinsically compliant. Refinery sour service is assessed separately under MR0103 / ISO 17945 where that standard applies.
Key Upstream Applications
Wellhead Ring Joints
R, RX, and BX ring joint selection must match the exact API 6A equipment, groove, pressure and temperature class, dimensions, surface finish, material condition, and project requirements.
Sour Gas Production Flanges
Select the exact spiral wound gasket construction for the defined gas sweetening, amine, or sulphur-recovery environment. Confirm filler, winding product form and condition, hardness, flange, pressure-temperature envelope, and the applicable sour-service standard.
Ring Joint Gasket Materials
RTJ gasket metal is normally specified softer than the flange groove. The gasket flows into the groove's micro-fine surface structure to create the seal.
Verify the applicable API 6A and ASME B16.20 requirements against licensed text and the equipment drawing
Sour Service
Do not substitute a metallic gasket component in H₂S service from alloy name alone. Check the applicable MR0175 / ISO 15156 or MR0103 / ISO 17945 limits, material condition, hardness, product form, exact environment, and project specification through the site's Management of Change process.
Pipelines, Compression & Transport
Pipeline Flanges
Transmission pipeline joints may see pressure cycling, temperature changes, vibration, and isolation duty. Select the gasket from the governing pipeline and flange standards, line class, medium, design pressure and temperature, flange facing, bore, bolting, and project specification rather than from pressure class alone.
Australian pipeline requirements depend on system boundaries, jurisdiction, fluid, project basis, and the applicable parts of AS 2885 or another governing code. Confirm the flange and gasket reference from the project documentation instead of assuming one standard applies across production facilities and transmission lines.
Compressor Sealing
Reciprocating compressor joints can see pulsating pressure and vibration. Inner-ring selection depends on the current ASME B16.20 requirements, filler, size and class, flange bore, line class, and owner specification. Pulsation alone does not determine the requirement.
Rapid Gas Decompression (RGD). Risk depends on gas composition, pressure, temperature, decompression rate, geometry, and the exact compound. Where RGD qualification is required, match the compound code, report revision, test medium, pressure, temperature, decompression schedule, and seal geometry to the offered product. A polymer family does not inherit NORSOK M-710 or ISO 23936-2 evidence. See our hydrogen industry page for the closely related H₂ permeation and embrittlement guidance.
Flange Isolation
Electrical isolation locations must come from the cathodic-protection and electrical design. At each selected location, check the sealing duty, insulation level, bonding, surge, static and lightning control, hazardous-area requirements, installation, and commissioning. Do not add isolation kits solely because cathodic protection exists.
Pipeline Joint Inputs
Joint information needed before selection:
- — Governing code, facility or transportation-system boundary
- — Line class, flange standard, size, class, facing, and bore
- — Medium, contaminants, normal and upset pressure-temperature
- — Cycling, electrical isolation, fire, emissions, and documentation duties
Refineries & Petrochemical Plants
Refinery shutdowns bring large gasket lists, short work windows, and changing scope. Startup and shutdown also introduce thermal cycling and pressure transients, so the joint review must include operating and upset conditions, flange history, bolting, assembly procedure, and the exact gasket construction.
Atmospheric Distillation (CDU)
Column, overhead-line, and reboiler joints need the stated hydrocarbon composition, normal and upset pressure-temperature conditions, oxidation atmosphere, flange design, cycling, and project gasket specification.
Catalytic Cracking (FCCU)
Reactor, regenerator, and cyclone connections can combine high temperature with an oxidising atmosphere. Select the exact filler, winding, flange, and assembly from the project specification and named-product data; do not infer suitability from a material family.
Heat Exchangers
Channel-to-tubesheet, floating-head, and shell-girth joints need flange geometry, available bolt load, thermal cycling, pass-partition details, media on both sides, and the equipment or project gasket specification.
Valve Packing & Bonnets
Low-emission evidence must match the tested packing material or complete valve assembly. API 622 addresses packing material testing and API 624 addresses the valve assembly; neither result transfers automatically to a different construction.
High-Pressure Steam
Boiler connections, heater headers, and turbine joints need the design and upset pressure-temperature envelope, oxidation conditions, flange and bolting materials, assembly procedure, and project gasket specification.
Pressure Vessel Manways
Reactor and column manways require the cover geometry, available bolt load, seating width, internal or external cover design, cycling, medium, and vessel specification before a gasket type is selected.
Turnaround Planning
Build the gasket bill of materials from current line, vessel, and exchanger records rather than the previous kit list. Confirm the supply route, manufacturing or sourcing responsibility, document package, quantities, and lead time for each item at quotation.
For non-hydrocarbon chemical plants — reactive acids, caustics, and solvent service — see our Chemical Processing industry page for PTFE, FFKM, and standards-specific guidance.
LNG & Cryogenic Service
LNG service near -162 °C requires a material set selected under the governing code and project specification for the design minimum metal temperature. Differential thermal contraction can change gasket stress during cool-down, while seal compounds, metal components, bolting, and flanges may have different low-temperature limits.
304L and 316L stainless steel are common cryogenic candidates, but they are not the only available materials. Nickel alloys, purpose-designed cryogenic steels, and other materials may be selected when their grade, product form, toughness, and code or project evidence match the duty. Likewise, PTFE suitability depends on the exact grade, filler, construction, joint load, cycling, and documented low-temperature performance.
The critical design challenge is differential thermal contraction. Coefficient of thermal expansion (CTE) mismatch between bolt, gasket, and flange materials creates gaps during cooldown that can open leak paths. The risk is that ambient-temperature commissioning gives a misleading result: a joint that looks tight at 20 °C may not stay tight when it contracts to -162 °C, and CTE-driven leak paths often only appear on first cool-down.
Cryogenic Joint Inputs
- Design basis: governing code, project specification, design minimum metal temperature, and upset conditions
- Joint: flange material and facing, bolting, available gasket stress, bore, and assembly procedure
- Materials: documented low-temperature toughness or compound performance for each component
- Operation: cool-down rate, thermal cycles, purity requirements, leakage criteria, and inspection plan
Cryogenic Material Selection
Select the gasket, flange, bolting, and seal materials for the design minimum metal temperature under the governing code and project specification. Do not approve or reject a material family without its grade, product form, heat treatment, toughness or compound data, and joint conditions.
Fire Safety & Fugitive Emissions
Fire-Test Evidence
API 589, third edition (2025), directly covers fire testing of valve stem packing and piping flange gaskets. API 6FB covers tested end connections, while API 607 and API 6FA cover their stated valve scopes. Keep each result attached to the exact tested object.
A filler name or similar construction does not establish a pass. Fire-test evidence must identify the manufacturer, gasket construction, size and class or other test envelope, assembly or valve configuration where applicable, report or certificate, test edition, and current scope.
Evidence to Match
- Exact gasket, end-connection assembly, or valve configuration tested
- Construction, materials, size and class, pressure, and test envelope
- Test standard and edition, report or certificate number, and issuing body
- Manufacturer, manufacturing site where relevant, current scope, and any limitations
- Project acceptance of the supplied item and its supporting evidence
If the required evidence cannot be matched to the offered gasket or assembly, describe the construction only as a candidate for engineering review. Do not call it certified, approved, qualified, or equivalent to a tested item.
Fugitive Emissions
Fugitive-emissions requirements depend on the equipment, medium, jurisdiction, site limit, and project specification. Leak Detection and Repair programmes measure installed equipment; material choice alone does not establish the emissions performance of an assembled joint or valve.
EN 13555 provides gasket parameters from defined tests; a parameter is not by itself a TA Luft certificate. TA Luft is the German Technical Instructions on Air Quality Control. ISO 15848-1 addresses valve stem or shaft seals and body joints, not piping end-connection joints. Record the exact test gas, class notation, temperature, pressure, cycles, report, and item tested before making a claim.
Standards & Specifications
Flanges, Gaskets & Assembly
Metallic gasket dimensions, materials, tolerances, and markings. Apply the detailed requirements for the exact gasket type, filler, size, class, and flange standard.
Flanges in Classes 150–1500 cover NPS ½–24; Class 2500 flanges cover NPS ½–12. The standard contains separate provisions for flanged fittings, so keep the fitting scope distinct from the flange range.
Bolted flange joint assembly guidance. Gasket selection must remain consistent with flange condition, bolting, target gasket stress, assembly procedure, and the governing code or project specification.
Service Qualification & Emissions
Direct fire-test method for evaluating valve stem packing and piping flange gaskets. Evidence applies only to the tested construction, configuration, report, and stated scope.
Use MR0175/ISO 15156 for defined H₂S-containing oil and gas production environments and MR0103/ISO 17945 for defined refining environments. Verify product form, material condition, hardness, and the actual environment.
API 622 addresses valve packing material testing; API 624 addresses complete valve assembly testing. Keep the claimed result attached to the exact tested object and report.
Gasket Materials for Oil & Gas
Material families are starting points only. Select the exact grade, product form, filler, winding or facing, and gasket construction from the stated medium, pressure-temperature envelope, atmosphere, cycling, flange, bolting, and project requirements.
SWG Filler Materials
Flexible graphite grades have different oxidation limits, purity, reinforcement, inhibitors, and pressure-temperature behaviour. Use the named product data and do not infer fire-test performance from graphite content alone.
PTFE has broad chemical resistance, but grade, filler, permeability, creep, gasket stress, pressure-temperature conditions, and joint design control suitability. Cryogenic use needs documented performance for the exact construction.
Mica-based fillers may be considered for selected high-temperature oxidising duties. Confirm the named product's temperature, pressure, leakage, gasket-stress, cycling, and fire-test data with the project specification.
Winding & Alloy Materials
These grades have different corrosion, temperature, fabrication, and toughness limits. Confirm the exact grade and condition against the medium, chlorides, design temperature, product form, flange material, and project materials specification.
Inconel 625 may be a candidate for defined corrosive or sour environments. Alloy name alone does not establish MR0175 / ISO 15156 acceptance; verify product form, heat treatment, hardness, cold work, environment, and project limits.
Monel 400 and Alloy C-276 have different chemical and mechanical limits. Select either only after reviewing concentration, contaminants, temperature, pressure, product form, flange compatibility, and the project materials specification.
Products for Oil, Gas & Petrochemical
Engineering Guides for Oil & Gas
Our technical guides cover spiral wound gasket selection, pressure-temperature ratings, and chemical compatibility, with the standards and selection criteria that apply in hydrocarbon service.
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Turnaround or Emergency Gasket Supply?
Send the current gasket bill of materials, drawings, service conditions, quantities, required standards, fire or emissions evidence, and delivery point. We will confirm the supply route, documentation scope, and lead time at quotation.
- Exact flange, gasket and service requirements checked
- Test and material evidence matched to the offered item
- Availability and lead time confirmed for the named order
Disclaimer
This page is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.
Temperature ranges, chemical resistance ratings, and mechanical properties cited on this page are typical values for standard grades. Actual performance varies with compound formulation, filler package, and service conditions — contact us to confirm suitability for your specific application.