Flanges
 American
Standards Flanges |
|
Specifications
- Materials: Most standards specify the material from which
the flange is produced. The buyer should specify the exact
requirements.
- Flange Sizes: All grades and sizes compatible to standard
pipe ranges and wall thicknesses (pressure ratings) are available.
- Flange Face: We offer flanges in various face
configurations like flat face, raised face, tongue and groove, ring
joint.
- Face Finish: The finish on the flange face is determined
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,
3.2/6.3 Ra, 1.6/3.2 Ra or 6.3/12.5 Ra. The range 3.2/6.3 Ra is most
popular.
Summary of materials used for flanges
| |
ASME/ANSI B16.5 |
ASME B16.47 Series A(or
MSS SP-44) |
ASME B16.47 Series B ( or
API 605) |
BS 4504 |
BS 3293 |
BS 10 |
| Forging (ASTM A 182) |
yes |
yes |
yes |
yes |
yes |
yes |
| Plate (ASTM A 240) |
yes |
|
|
yes |
|
yes |
| Bar |
|
|
|
|
|
yes |
| Casting |
yes |
|
|
yes |
|
yes |
Summary of flange sizes specified by common standards
| Flange Type |
Specifications |
| Forging (ASTM A 182) |
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 |
| Plate (ASTM A 240) |
Nominal Pipe Sizes |
| Bar |
< NPS 26 |
>NPS 26 |
>NPS 26 |
DN 10 to DN 4000 |
> NPS 26 |
|
Nominal Pressure (Class) |
|
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 |
150-1500 |
- |
- |
2.5-40 |
150-600 |
| Blind |
150-2500 |
300-900 |
300-900 |
2.5-40 |
- |
| Lap Joint |
150-2500 |
- |
- |
6-403 |
- |
| Socket Weld |
150-1500 |
- |
- |
N/A |
- |
| Threaded |
150-2500 |
- |
- |
6-40 |
- |
| Flat/Raised Facings |
150-2500 |
- |
- |
6-40 |
- |
| Ring Joint Facings |
150-2500 |
300-900 |
300-900 |
2.5-40 |
300-600 |
| Other Facings |
150-2500 |
3 |
- |
- |
2.5-40 |
Types of Flanges
(American Standards)
Weldneck
Flange |
|
This flange is circumferentially welded into the system at its neck.
This implies that the integrity of the butt welded area can be easily
studied by radiography. The bores of both pipe and flange match. This
helps in reducing turbulence and erosion inside the pipeline. The weld
neck flanges are therefore favoured in critical applications
| Weldneck Flange Grades |
Grade:
F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317,
347, 347H,904L
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless
steel UNS S32750 |
Types of weldneck flanges
Slip
on Flange |
|
The slip on flange is slipped over the pipe and then fillet welded.
These flanges are suitable to be used in fabricated applications.
| Slip on Flange Grades |
Grade:
F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317,
347, 347H,904L
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless
steel UNS S32750 |
Types of Slip on flange
Blind
Flange |
|
Blind flanges are used to blank off pipelines, valves and pumps. Blind
flanges can also be used as an inspection cover. Also referred to as a
blanking flange.
| Blind Flange Grades |
Grade:
F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317,
347, 347H,904L
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless
steel UNS S32750 |
Types of Blind Flange
Socket
Weld Flange |
|
Socket weld flange is counter bored to accept the pipe before being
fillet welded. The bore of the pipe and flange are both the same
therefore giving good flow characteristics.
| Socket Weld Flange Grades |
Grade:
F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317,
347, 347H,904L
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless
steel UNS S32750 |
Types of socket weld flange
Lap
Joint Flange |
|
Lap joint flanges are always used with either a stub end or taft which
is butt welded to the pipe with the flange loose behind it. This implies
that the stub end or taft always makes the face. The lap joint is
preferred in low pressure applications because it is easily assembled
and aligned. To reduce cost, threaded flanges can also be supplied
without a hub and/or in treated, coated carbon steel.
Types of Lap Joint Flange
Threaded
Flange |
|
The threaded flange is also referred to as either threaded or screwed.
It is used to connect other threaded components in low pressure,
non-critical applications. No welding is required in socket weld flange.
| Threaded Flange Grades |
Grade:
F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317,
347, 347H,904L
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless
steel UNS S32750 |
Types of Threaded Flange
Ring
Type Joint Flange |
|
Ring type joint flange is a type of leak proof flange connection at high
pressures. A metal ring is compressed into a hexagonal groove on the
face of the flange to make the seal. This jointing method can be
employed on Slip-on, Weld Neck, and Blind Flanges.
We produce the following types of ring type joint flanges:
|
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