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Flanges
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| Summary of material used for flanges | ||||||
| MATERIAL | ASME/ANSI B16.5 | ASME B16.47 SERIES A (MSS SP-441 | ASME B16.47 SERIES B (or API 6052) | BS 4504 | BS 3293 | BS 103 |
| Forging(ASTM A182) | - | - | - | - | - | - |
| Plate (ASTM A240)4 | - | - | - | - | - | - |
| Bar5 | - | - | - | - | - | - |
| Casting6 | - | - | - | - | - | - |
> MSS SP-44 flanges are designated series A flanges in ASME B16.47.
> API 605 has been cancelled. API 605 flanges are designated series B flanges in ASME B16.47. > BS 10, although obsolete, remains in use for light weight economy stainless steel flanges.
> Within specification ANSI B16.5, plate can only be used to provide blind flanges.
> Most small BS 10 flanges are made from bar.
> Castings are not included in this manual.
Materials:Most standard specify the material from which the flanges is produced. The purchaser should specify the exact requirements.
Flange Size:All sizes and grades compatible to standard pipe flanges and wall thicknesses (pressure ratings) are available. The table bellow provides a summary.
Flange Face:There are various face configurations for flanges. Typically: flat face, raised face, tongue and groove, and ring joint.
Face Finish:The finish on the face of a flange is measured as an Arithmetical Average Roughness Height (AARH). The finish is determined by the standard used. For example, ANSI B16.5 specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). Other finishes are available on request, for example 1.6 Ra Max. 1.6/3.2 Ra, 3.2/6.3 Ra or 6.3/12.5 Ra. The range 3.2/6.3 is most common.
| Summary of flanges size specified by common standards | |||||
| FLANGE TYPE | ASME/ANSI B16.5 | ASME B16.47 Series A (or MSS SP-441) | ASME B16.47 Series B (or API 6052) | BS 4504 (ISO 7005-1) | BS 3293 |
| Nominal Pipe Sizes | |||||
| Class (lb) | Class (lb) | Class (lb) | PN (bar) | Class (lb) | |
| Weld Neck | 150 - 2500 | 150 - 900 | 75 - 900 | 2.5 - 40 | 150 - 600 |
| Slip-on | 150 - 2500 | - | - | 2.5 - 40 | 150 - 600 |
| Blind | 150 - 2500 | 300 - 900 | 300-900 | 2.5 - 40 | - |
| Lap Joint | 150 - 2500 | - | - | 2.5 - 40 | - |
| Socket Weld | 150 - 2500 | - | - | N/A | - |
| Threaded | 150 - 2500 | - | - | 6 - 40 | - |
| Flat/Raise Facings | As above | As above | As above | As above | As above |
| Ring Joint Facings | 150 - 2500 | 300 - 900 | 300 - 900 | 2.5 - 40 | 300 - 600 |
| Other Facings | 150 - 2500 | - | - | 2.5 - 40 | - |