ASME / ASTM / API Flanges
We at rff supply ASME flanges in all shapes and designs according to any technical standard. Our stock and delivery programme is tailored to match a wide variety of needs.
Apart from common ASME B 16.5 flanges, we also provide weld neck and blind flanges larger than 24 inches according to ASME B 16.47. We also provide special flanges according to ASME B 16.36 and 16.48 as well as BS 3293 and API 6A. Whether you need a standard design from stock or bespoke flange prefabrication, we at rff will find an ideal solution to fit your requirements.
Designs and standards
Standardised ASME flanges are diverse. We would therefore recommend that you enquire about dimensions and pressure ratings available in our supply range. We supply all common standardised flanges according to ASME B 16.5 and 16.47 as well as ASME B 16.36 and 16.48.
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| Flanges acc. to ASME B 16.5 / 16.47 | Pressure ratings | Dimensions |  Datasheets |
|---|---|---|---|
| Weld Neck Flanges / WN | Class 150 to 2500 | ||
| Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500 |
1/2" - 24" 1/2" - 24" 4" - 24" 1/2" - 24" 3" - 24" 1/2" - 24" 1/2" - 12" |
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|
| Slip-on Flanges / SO | Class 150 to 1500 | ||
| Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 |
1/2" - 24" 1/2" - 24" 4" - 24" 1/2" - 24" 3" - 24" 1/2" - 2 1/2" |
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|
| Lap Joint Flanges / LJ | Class 150 to 1500 | ||
| Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500 |
1/2" - 24" 1/2" - 24" 4" - 24" 1/2" - 24" 3" - 24" 1/2" - 24" 1/2" - 12" |
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|
| Blind Flanges / BL | Class 150 to 1500 | ||
| Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500 |
1/2" - 24" 1/2" - 24" 4" - 24" 1/2" - 24" 3" - 24" 1/2" - 24" 1/2" - 12" |
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|
| Threaded Flanges / TH | Class 150 to 1500 | ||
| Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500 |
1/2" - 24" 1/2" - 24" 4" - 24" 1/2" - 24" 3" - 24" 1/2" - 2 1/2" 1/2" - 2 1/2" |
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|
| Socket Welding Flanges / SW | Class 150 to 1500 | ||
| Class 150 Class 300 Class 600 Class 1500 |
1/2" - 3" 1/2" - 3" 1/2" - 3" 1/2" - 2 1/2" |
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|
| Flanges acc. to ASME B 16.47 Series A | Pressure ratings | ||
| Weld Neck / Blind Flanges RF Weld Neck / Blind Flanges RTJ |
Class 150 Class 300 Class 400 Class 600 Class 900 Class 300 Class 400 Class 600 Class 900 |
26" - 60" 26" - 60" 26" - 60" 26" - 60" 26" - 48" 26" - 36" 26" - 36" 26" - 36" 26" - 36" |
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| Flanges acc. to ASME B 16.47 Series B | Pressure ratings | ||
| Weld Neck / Blind Flanges RF | Class 75 Class 150 Class 300 Class 400 Class 600 Class 900 |
26" - 60" 26" - 60" 26" - 60" 26" - 36" 26" - 36" 26" - 36" |
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| Other Flanges | according to | ||
| Long Welding Neck Flanges Reduced Threaded / Slip on Flanges Orifice Flanges Line Blanks Weld Neck / Slip on Flanges |
ASME B 16.5 ASME B 16.5 ASME B 16.36 ASME B 16.48 B.S. 3293 / API 6A |
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General information
| Information on | Flanges acc. to ASME | Datasheets |
|---|---|---|
| Overview and tolerances | ||
| General overview Tolerances Pressure ratings, dimensions and facings General overview Tolerances |
B 16.5 B 16.5 B 16.5 B 16.47 Serie A/B B 16.47 Serie A/B |
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| Facings and Screws | ||
| Dimensions RTJ (Ring Type Joint) Tongue and groove / Male and female faching Length of bolts |
B 16.5 B 16.5 B 16.5 |
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| Conversion table / Inch | ||
| to millimetres / fractional values / decimal number | Download | |
| Materials | ||
| List of materials | B 16.5 / 16.47 | Download |
Material grades
The range of standard materials is extensive. This is a selection of unalloyed, alloyed heat-resistant, low-temperature, fine-grain structural steel and stainless steel material grades that are common and available.
| Material selection | Material groups |
|---|---|
| A/SA105 / C21, P250GH, P280GH | Unalloyed heat-resistant |
| A/SA 182 Grade F5, F9, F11, F12, F22, F91 | Alloyed heat-resistant |
| A/SA 350 Grade LF2, P355QH1 | Low-temperture |
| A/SA 694 Grade F52, F60, F65 | Fine grain steel |
| A/SA 182 Grade F304/L, F321/H, F316/L | Stainless steel |
| 1.4301/1.4307, 1.4541. 1.4401/1.4404, 1.4571 | Stainless steel |
| F51 (Duplex), F53 (Superduplex) | Duplex / Superduplex |
| Special Alloys | Special steel |
Dimensions
The individual standards provide for a wide variety of options. Availability of individual flange types and designs is limited - please request in advance.
Processing and modification
We have a processing service certified by TÜV to turn, drill (flat or threaded), blast, coat or mark flanges according to ASME/ASTM for any requirement according to customer specification.
Products compatible with our ASME flanges
Product catalogues
Refer to our media centre for more details on pipes, flanges, butt weld fittings and pipe equipment according to DIN, EN and ASME.
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