Buy Flanged Fittings Online in Australia
Flanged Fitting Selection — Quick Reference
Flanged fittings bolt to mating flanges — assembled + disassembled without welding. The choice for process piping where maintenance/replacement matters. Selection turns on flange standard (Table D/E vs ANSI 150 vs DIN), material, and gasket choice.
| Flange Standard | Pressure Rating | Best For |
|---|---|---|
| AS Table D | 14 bar (200 psi) cold WP | Australian standard — water, light air, general workshop |
| AS Table E | 21 bar (300 psi) cold WP | Australian heavier-duty — process, oil + chemical |
| AS Table F / H | 35 / 70 bar (500 / 1,000 psi) | Australian high-pressure industrial |
| ANSI 150# (US Standard) | 20 bar (285 psi) cold WP | US-import process equipment, oil + gas |
| ANSI 300# / 600# | 50 / 100 bar (775 / 1,480 psi) | Higher-pressure US-spec process |
| DIN PN 10 / PN 16 / PN 25 / PN 40 | 10 / 16 / 25 / 40 bar | European-spec equipment + pressure ratings in bar |
Critical: Flange standards are NOT interchangeable — Table D and ANSI 150 are similar pressure but different bolt circle + face geometry. Match flange standard end-to-end on a system. Gasket: spiral wound + bonded seal for hydrocarbon service; ring joint gasket for highest pressure. Fitting types: elbows 90°/45°, tees, reducers, blank flanges, weld neck, slip-on, socket weld. Brands: AAP, Dixon. Companion: spiral wound gaskets, pipe fittings, gate valves, spiral wound gasket guide.
Flanged Fittings
Flanged fittings connect to pipe using a flanged end that bolts to a mating flange on the pipe, valve, or adjacent fitting — creating a joint that can be assembled and disassembled without welding. This is the primary advantage of flanged connections over welded connections: a flanged joint can be broken for maintenance, component replacement, or system modification without requiring a welder or hot work permit. Flanged fittings are standard in process piping, industrial plant, and any system where valves, instruments, or pipe sections must be routinely removed and reinstalled. AIMS Industrial supplies flanged fittings in carbon steel and stainless steel for industrial applications.
Types of Flanged Fittings
- Flanged elbows (90° and 45°): Change flow direction at a flanged joint. The flanged ends allow the elbow to be positioned at any rotational angle before bolting, providing flexibility in tight pipework routing.
- Flanged tees: Branch a flanged pipe run at 90°. Equal and reducing tee variants suit different branch flow requirements.
- Flanged reducers: Step the pipe size down while maintaining flanged connectivity at both ends. Concentric and eccentric variants as for butt weld reducers.
Flange Standards and Pressure Ratings
Flanges and flanged fittings in Australian industrial piping are most commonly to ANSI/ASME B16.5 (imperial, in common use across Australian industry) or AS 4087 (Australian Standard). Flange pressure class (Class 150, 300, 600, 900, 1500) must be matched to the system operating pressure and temperature — higher pressure classes have thicker flanges and require higher bolt loads. Mixing pressure classes creates an unrated joint that may fail in service. Always verify flange class and facing type (raised face, flat face) when ordering flanged fittings for an existing system.
Gaskets
Flanged joints require a gasket between the mating faces to achieve a seal. Gasket material must be compatible with the fluid and operating temperature: spiral wound gaskets for steam and high-temperature service; PTFE envelope gaskets for chemical service; full-face rubber gaskets for low-pressure water service. Gaskets are replaced whenever a flanged joint is broken — reusing a compressed gasket results in an unreliable seal. For flanged fitting selection and pressure class guidance, contact our team.
Service Conditions and Material Selection
Carbon steel flanged fittings are the standard for general industrial service — steam, compressed air, water, and hydrocarbon media at moderate pressures and temperatures. Stainless steel flanged fittings are specified for corrosive media, food and beverage processing, and chemical service where carbon steel would corrode or contaminate the process. AIMS Industrial supplies flanged fittings in carbon and stainless steel, and our team can assist with specification confirmation for specific service conditions and pressure classes.
People Also Ask — Flanged Fittings
Q: What flanged fittings does AIMS stock?
Industrial pipe flanges (slip-on, weld-neck, blind, threaded), gaskets (sheet gasket cut-outs, spiral wound — see [Spiral Wound Gasket Guide](/blogs/product-guides/spiral-wound-gasket-guide)), flange bolts (high-tensile sets sized to match flange standard), flange isolation kits (insulation against galvanic corrosion), and flanged valves and fittings for pipework systems. Used in industrial piping, process plants, hydraulic systems, and any high-pressure pipework. Match flange standard to existing pipework (AS, ANSI, DIN, JIS).
Q: What flange standard do I need?
Australian-spec pipework: AS 2129 (table E general industrial), AS 4087 (table B water utility), AS 4331 (table D higher pressure). Imperial-spec: ANSI/ASME B16.5 (Class 150, 300, 600, 900, 1500, 2500). European: EN 1092 (PN 6, 10, 16, 25, 40, 63, 100). Match the flange spec to existing pipework dimensions — AS and ANSI flanges have different bolt patterns and dimensions even at same nominal pipe size. Identify before ordering.
Q: Slip-on, weld-neck, or threaded flange?
Slip-on flange: slides over the pipe end and welds in two locations (front and back). Workshop standard for low-pressure applications, easier to install than weld-neck. Weld-neck flange: tapered neck welds to pipe (full-penetration weld), highest mechanical strength, used for high-pressure and critical applications. Threaded flange: screws onto threaded pipe, no welding required, but limited to lower pressures. Match to pressure rating and pipe connection method.
Q: Spiral wound or sheet gasket?
Spiral wound gasket (graphite filler with stainless steel winding): precision-engineered for high-pressure, high-temperature, critical sealing. Handles flange face surface imperfections. Standard for ASME B16.5 raised-face flanges. Sheet gasket (graphite, fibre composite, rubber): cut from rolled material, lower cost, suitable for low/medium pressure. For high-pressure and critical applications: spiral wound. For low-pressure water and air: sheet gasket. See [Spiral Wound Gasket Guide](/blogs/product-guides/spiral-wound-gasket-guide).
Q: How do I torque flange bolts?
Critical sequence: clean flange faces, install gasket centred, install all bolts hand-tight. Then torque progressively in star pattern (opposite-corner sequence) in 4-5 passes: 30%, 60%, 100% of final torque. Final pass apply additional 1/8 turn (snug-tight beyond). Final torque per flange standard and bolt grade. Don't over-torque — crushes the gasket. Don't under-torque — flange leaks. For critical applications, use calibrated torque wrench + bolt elongation measurement.