Stainless Steel Flanges
Stainless flanges are AISI 304 or 316 flanges that connect stainless pipelines to valves, pumps, tanks and equipment with bolts, in a detachable way.
They are used for flanged equipment connections in food, dairy, pharmaceutical, chemical and treatment plants. Plate, blind, weld neck and slip-on types are supplied from DN15 to DN450, mostly in PN16.
Main Applications
- Stainless valve and pump connections
- Food and dairy tank nozzles
- Chemical and treatment lines
- Heat exchanger and reactor nozzles
- Seawater lines
- Line end and test closures (blind flange)
Technical Data
| Flange types | Plate, blind, weld neck, slip-on |
|---|---|
| Material | AISI 304; AISI 316 option for slip-on (product range) |
| Plate flange | DN15 – DN350 PN16, DN450 PN10 (product range) |
| Blind flange | DN15 – DN400 PN16 (product range) |
| Weld neck | DN20 – DN250 PN16 (product range) |
| Slip-on | DN100, 150 lb, AISI 316 (product range) |
| Connection | With bolts, nuts and flange gasket |
| Connection to pipe | TIG welding |
| Surface | Uncoated stainless |
| Compatibility | Same DN and PN as the mating flange |
Material Options
| Property | AISI 304 stainless | AISI 316 stainless | Carbon steel |
|---|---|---|---|
| Body | AISI 304 stainless steel | AISI 316 stainless steel (selected sizes) | Carbon steel, grade depending on model |
| Pressure class | Mostly PN16 (product range) | Depending on model | PN6 – PN40 |
| Surface | Uncoated stainless | Uncoated stainless | Black or oiled |
| Gasket | PTFE, EPDM or graphite (depending on medium) | PTFE or Viton (depending on medium) | Compressed fibre or graphite |
| Suitable media | Food, drinking water, mild chemicals | Chloride-containing water, aggressive chemicals | Heating water, steam, fire water |
Which material? Since the surface in contact with the medium is also stainless, stainless flanges are preferred on lines requiring hygiene and corrosion resistance; stainless bolts and nuts are also recommended.
Advantages
Hygienic and Corrosion Resistant
- The surface in contact with the medium is stainless
Four Types
- Plate, blind, weld neck, slip-on
Wide Size Range
- From DN15 to DN450
316 Option
- For aggressive environments
Construction and Design Features
- Ring body, mostly PN16 bolt pattern
- Types joined to the pipe by TIG welding
- Solid body on blind flanges
- Uncoated stainless surface
Send the flange type, DN and PN class, grade and quantity; we will confirm suitable stainless flanges from stock.
How to Choose?
- Determine DN and PNFind the flange size and class of the equipment to connect.
- Choose the gradeDecide on AISI 304 or 316 for the medium.
- Choose the typePrefer plate flanges for general use, weld neck for high stress.
- Determine the gasketChoose a PTFE or EPDM gasket suited to food and chemicals.
Complementary Products
Why ORFA?
Types of Stainless Steel Flanges
Stainless Steel Plate Flanges
Stainless steel plate flanges are flat flanges slipped over stainless pipe and fixed by welding.
Details →
Stainless Steel Weld Neck Flanges
Stainless steel weld neck flanges have a neck butt-welded to stainless pipe.
Details →
Stainless Steel Blind Flanges
Stainless steel blind flanges close the end of a stainless line or piece of equipment with a bolted joint.
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Stainless Steel Slip-On Flanges
Stainless steel slip-on flanges are slipped over stainless pipe and fixed by welding.
Details →Other Welded Stainless Steel Fittings
Stainless Steel Eccentric Reducers
Stainless steel eccentric reducers change pipe size on welded stainless lines while keeping one side flat.
Details →
Stainless Steel Butt Weld Reducing Tees
Stainless steel butt weld reducing tees are used to take a smaller branch off the main run on stainless steel lines.
Details →
Stainless Steel Butt Weld Caps
Stainless steel butt weld caps are used to close the end of a stainless steel pipe by welding.
Details →
Stainless Steel Weld-End Conical Unions
Stainless steel weld-end conical unions create a tight, removable joint on welded stainless steel lines.
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Stainless Steel Butt Weld Crosses
Stainless steel butt weld crosses split flow in four directions on welded stainless steel lines.
Details →
Stainless Steel Butt Weld Tees
Stainless steel butt weld tees split flow in three directions on welded stainless steel lines.
Details →
Stainless Steel Concentric Reducers
Stainless steel concentric reducers change pipe size on welded stainless lines along the same centre line.
Details →
Stainless Steel Butt Weld Elbows
Stainless steel butt weld elbows are fittings used to change direction on welded stainless steel lines.
Details →
Stainless Steel Single-Side Threaded Nipples
Stainless steel single-side threaded nipples are transition pieces with one threaded end and one plain end for welding.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.