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carbon steel p245gh flange carbon steel p245gh flange
Hebei Xinghao Pipeline Equipment Manufacturing Co.,Ltd
PIPE FITTING FLANGE
A flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of acamera; or for a flange of a rail car or tram wheel. Thus flanged wheels are wheels with a flange on one side to keep the wheels from running off the rails. The term "flange" is also used for a kind of tool used to form flanges. Pipes with flanges can be assembled and disassembled easily.
Flange Specification
- ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
- ASME B16.47 - Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard (Covers MSS SP-44 and API 605 flanges)
- MSS SP-44 - Steel Pipeline Flanges (Covered by ASME B16.47 Series A)
- API 605 - Cancelled (Covered by ASME B16.47 Series
- API Spec 6A - Specification for Wellhead and Christmas Tree Equipment
- ASME B16.5 and ASME B16.47 cover pipe flanges up to NPS 60 (B16.5 from 1/2" to 24" and B16.47 from 26" to 60"). ANSI B16.47 covers two series of flanges, Series A is equal to MSS SP-44-44, and Series B is equal to API 605 (API 605 has been canclled).
Flange ANSI B16.5 and B16.47 Class Rating
| Flange Type | ANSI B16.5 1/2"-24" | ANSI B16.47 Series A (MSS SP-44) 26"-60" | ASME B16.47 Series B (API 605) 26"-60" |
|---|---|---|---|
| Blind | 150-2500 | 300-900 | 300-900 |
| Lap Joint | 150-2500 | - | - |
| Slip-On | 150-2500 | - | - |
| Socket | 150-2500 | - | - |
| Threaded | 150-2500 | - | - |
| Weld Neck | 150-2500 | 150-900 | 75-900 |
| Flat/Raised Facing | As Above | As Above | As Above |
| Ring Joint Facing | 150-2500 | 300-900 | 300-900 |
| Other Facings | 150-2500 | - | - |
Flange Dimensional Tolerances, ASME B16.5 (in)
Weld Neck Flange
| Dimension | Flange | Tolerance |
|---|---|---|
| A | Outside Diameter |
|
| D | Inside Diameter |
|
| B | Diameter of contact face |
|
| J | Diameter of hub at base |
|
| H | Diameter of hub at point of welding |
|
| P | Drilling |
|
| Eccentricity of bolt circle with respect to facing |
| |
| C | Thickness |
|
| K | Length of hub |
|
Blind Flange, Lap Joint Flange, Slip-on Flange,Socket Flange, Threaded Flange
| Dimension | Flange | Tolerance |
|---|---|---|
| A | Outside Diameter |
|
| D | Inside Diameter |
|
| B | Diameter of contact face |
|
| E, F, S | Diameter of bore |
|
| P | Drilling |
|
| C | Thickness |
|
| L, M | Length of hub |
|
Flange Welding Bevel Standard, ANSI B16.5 and B16.47 (in)
- J = Diameter of hub at base
- H = Outside Diameter of flange and mating pipe
- D = Inside Diameter of flange
- t = Wall thickness of flange hub at bevel
- For bevel wall thickness (t) from 0.19 in. (3/16") to 0.88 in. (7/8") inclusive.
- For bevel wall thickness (t) greater than 0.88 in (7/8").
- Blind Flange - These flanges do not have a bore. It is used to blind off a flange or even a valve. When used at the end of a pipe or fitting, it provides an easy to open access for further extension of the pipe. The blind flange and its bolts are stressed more than any other flange.
- Lap Joint Flange - This flange is used with a lap joint stub end fitting. It is similar to a slip-on flange, but with two differences. The radius and the flat face, both allow the flange to secure against the stub end fitting. This is useful where alignment of bolt holes is difficult, such as with spools to be attached to flanged nozzles of vessels. A lap joint is used in low pressure applications and not suitable where high external of heavy loads are present.
- Slip-on Flange - Slip-on flanges are designed to slip over the outside of pipe, long-tangent elbows, reducers, and swages. The flange has poor resistance to shock and vibration. It is easier to align than welding neck flange. This flange is ideal for low pressure applications since the strength when under internal pressure is about one third that of a weld neck flange.
- Socket Flange - This is similar to a slip-on flange, except they have a bored and counter bore. The counter bore allows the pipe to fit into the socket/counter bore. The bore of the flange is the same diameter as the inside of the pipe. These flanges were first designed for small diameter, high pressure pipe.
- Threaded Flange - It is similar to a slip-on Flange, but has internal threads. It is normally used for low pressure and not used where temperature or stress is very high.
- Weld Neck Flange - This flange comes in two types, regular and long. The hub of the weld neck is designed to reduce the stress at the base of the flange. Regular weld neck flanges are used with buttweld fittings and long weld neck flanges are usually used with equipment and vessel nozzles. A long weld neck flange is rarely used with pipe. Both types of flanges are bored to match the inside diameter of the pipe or fitting to which it will be welded to. They are suitable where high pressure, extreme temperatures, shear impact and vibratory stresses apply.
- Ring Joint Facing Flange - Also known as RTJ Flanges. These are used for a leak-proof connection in high pressure applications. The flange has a hexagonal groove sealing surface and is fitted with a ring that is compressed in a groove.
Flange Facing Types
carbon steel p245gh flange
