Flanges: ANSI B16.5 & ASME B16.47 Weld Neck, Blind, Slip-On & Socket Weld Flanges
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Standards: ANSI/ASME B16.5 (½”-24″) · ASME B16.47 Series A/B (26″-60″) · Classes: 150 · 300 · 600 · 900 · 1500 · 2500 · Types: WN · Blind · SO · SW · Lap Joint · Threaded
Aashish Metals supplies pipe flanges across the full standard, class and type range, forged in stainless, alloy and carbon steel. The volume types are weld neck flanges for the strongest butt-welded joints and blind flanges for closing off a line, alongside slip-on, socket weld, lap joint and threaded patterns. Flanges are organised first by dimensional standard, which is set by pipe size, so the tables below take you straight to the right one.
Because a flange must match the pipe and the mating flange exactly, ordering by the correct standard, class, facing and bore matters more here than on almost any other component. The flanges are forged in the same grades as our Stainless Steel flanges and carbon and alloy ranges, so a flanged joint stays one material. Every flange ships with a mill test certificate and is dimensionally checked before dispatch.
B16.5 or B16.47? The Size Decision
| Standard | Size range | Notes |
|---|---|---|
| ANSI / ASME B16.5 | NPS ½ inch to 24 inch | The standard for small and medium bore; classes 150 to 2500 |
| ASME B16.47 Series A | NPS 26 inch to 60 inch | Large-diameter, the heavier MSS SP-44 lineage |
| ASME B16.47 Series B | NPS 26 inch to 60 inch | Large-diameter, lighter and more compact bolting than Series A |
Flange Types We Supply
ANSI Flanges
- ANSI B16.5 Class 150 Welding Neck Flanges
- ANSI B16.5 Class 150 Slip-On Flanges
- ANSI B16.5 Class 150 Blind Flanges
- ANSI B16.5 Class 150 Threaded Flanges
- ANSI B16.5 Class 150 Lap Joint Flanges
- ANSI B16.5 Class 150 Socket Weld Flanges
- ANSI B16.5 Class 300 Welding Neck Flanges
- ANSI B16.5 Class 300 Slip-On Flanges
- ANSI B16.5 Class 300 Blind Flanges
- ANSI B16.5 Class 300 Threaded Flanges
- ANSI B16.5 Class 300 Lap Joint Flanges
- ANSI B16.5 Class 300 Socket Weld Flanges
- ANSI B16.5 Class 600 Welding Neck Flanges
- ANSI B16.5 Class 600 Slip-On Flanges
- ANSI B16.5 Class 600 Blind Flanges
- ANSI B16.5 Class 600 Threaded Flanges
- ANSI B16.5 Class 600 Lap Joint Flanges
- ANSI B16.5 Class 600 Socket Weld Flanges
- ANSI B16.5 Class 900 Welding Neck Flanges
- ANSI B16.5 Class 900 Slip-On Flanges
- ANSI B16.5 Class 900 Blind Flanges
- ANSI B16.5 Class 900 Threaded Flanges
- ANSI B16.5 Class 900 Lap Joint Flanges
- ANSI B16.5 Class 900 Socket Weld Flanges
- ANSI B16.5 Class 1500 Welding Neck Flanges
- ANSI B16.5 Class 1500 Slip-On Flanges
- ANSI B16.5 Class 1500 Blind Flanges
- ANSI B16.5 Class 1500 Threaded Flanges
- ANSI B16.5 Class 1500 Lap Joint Flanges
- ANSI B16.5 Class 1500 Socket Weld Flanges
- ANSI B16.5 Class 2500 Welding Neck Flanges
- ANSI B16.5 Class 2500 Slip-On Flanges
- ANSI B16.5 Class 2500 Blind Flanges
- ANSI B16.5 Class 2500 Threaded Flanges
- ANSI B16.5 Class 2500 Lap Joint Flanges
ASME Flanges
- ASME B16.47 Class 150 Series A Welding Neck Flanges
- ASME B16.47 Class 150 Series A Blind Flanges
- ASME B16.47 Class 300 Series A Welding Neck Flanges
- ASME B16.47 Class 300 Series A Blind Flanges
- ASME B16.47 Class 600 Series A Welding Neck Flanges
- ASME B16.47 Class 600 Series A Blind Flanges
- ASME B16.47 Class 900 Series A Welding Neck Flanges
- ASME B16.47 Class 900 Series A Blind Flanges
- ASME B16.47 Class 150 Series B Welding Neck Flanges
- ASME B16.47 Class 150 Series B Blind Flanges
- ASME B16.47 Class 300 Series B Welding Neck Flanges
- ASME B16.47 Class 300 Series B Blind Flanges
We hold slip-on flanges, socket weld flanges, lap joint flanges and threaded flanges across the class range alongside the weld neck and blind patterns.
Pressure Classes 150 to 2500
Each flange is rated to a pressure class, 150, 300, 600, 900, 1500 or 2500, which sets its pressure-temperature limit and its thickness and bolting. Higher class means a heavier flange for higher pressure or temperature. We supply all six classes; the higher-class weld neck flanges from 300 upward, including Class 900 and Class 1500, carry the heavier ratings for power, refinery and high-pressure service. The class is set by the piping specification, so order to match it exactly.
Flange Materials
Flanges are forged, and the grade follows the pipe. Stainless flanges in A182 F304 and F316 cover general and corrosion service through our Stainless Steel flanges range, chrome-moly flanges in A182 F11, F22 and F91 for high temperature come from the Alloy Steel (chrome-moly) flanges side, and A105 carbon steel flanges for standard service sit with the Carbon Steel (A105) flanges. Duplex, super duplex and nickel-alloy flanges are supplied for the harsher corrosion grades. Keeping the flange, the pipe and the bolting to matching grades is what makes a joint code-compliant.
Flange Facings & Standards
The facing is the sealing surface, and it must match the mating flange and gasket. Raised face (RF) is the general-purpose default, flat face (FF) is used against cast-iron equipment to avoid cracking it, and ring-type joint (RTJ) with a metal ring gasket is used for high-pressure and high-temperature service, typically from Class 600 upward. Dimensions follow ASME B16.5 or B16.47 for the flange and ASME B16.20 or B16.21 for the gasket. Give us the facing along with the standard, class and bore so the flange seals against what it bolts to.
Quality, Certification & Testing
Every flange ships with an EN 10204 mill test certificate, heat-number traceable to the forging grade, and is dimensionally checked to the governing standard for bore, bolt circle and facing before dispatch. Positive material identification confirms the grade, NACE MR0175 documentation for sour service and third-party witness through BV, SGS or TUV are arranged at order stage. Common classes, types and grades ship quickly; large-diameter B16.47, high classes and higher alloys are confirmed on enquiry. Send the standard, class, type, size, facing and material and the quote comes back with the certification built in.
Flanges: Frequently Asked Questions
Weld neck, blind, slip-on, socket weld, lap joint and threaded flanges to ANSI/ASME B16.5 in ½ inch to 24 inch and ASME B16.47 Series A and B in 26 inch to 60 inch, in classes 150 to 2500, forged in stainless, alloy and carbon steel. If a standard, class or type is not listed, ask, because we hold more than the site shows and can source to specification.
Pipe size. ANSI/ASME B16.5 covers flanges from half an inch to 24 inch, and ASME B16.47 covers large-diameter flanges from 26 inch to 60 inch. They are not duplicates and not interchangeable: a 12 inch flange is B16.5 and a 36 inch flange is B16.47. B16.47 also has two series, A and B, whose bolting differs, so those are not interchangeable with each other either.
Strength and fit-up. A weld neck flange has a tapered hub butt-welded to the pipe, giving the strongest joint for high-pressure, high-temperature and cyclic service. A slip-on flange slides over the pipe and is fillet welded, which is easier to align and lower in cost but suited to lower-pressure service. The piping specification usually names which to use.
A flange class is its pressure-temperature rating: 150, 300, 600, 900, 1500 and 2500 in ascending order. A higher class means a thicker, heavier flange with more or larger bolts that holds a higher pressure at a given temperature. The class is set by the piping specification and must match across the flange, gasket and bolting for the joint to seal and be rated correctly.
It depends on pressure and the mating equipment. Raised face is the general-purpose default. Flat face is used against cast-iron equipment to avoid cracking it. Ring-type joint, with a metal ring gasket, is used for high-pressure and high-temperature service, usually Class 600 and above. The facing must match the mating flange and the gasket.
For More Information About Duplex and Super Duplex Stainless Steel Products please call +91-22-66362223 / 66394926 or send an email to export@aashishmetal.com
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