AS4087 / AS2129 Stainless Steel Flange F304 / F304L / F316L Blind
Flanges
AS2129 originates from BS10 and has been metricated. In some cases
slightly larger bolt holes provide better clearance as metric bolts
are specified in lieu of UNC bolts used by BS10. AS4087 is an
update of AS2129, however AS2129 is still widely used so it has not
been deleted as a standard, however, it now only covers AS table D
to H.
AS4087 is the latest standard for BS table D to H, the same drilling is
used but the new PN pressure rating system has been adopted. As the
new pressure ratings are slightly higher the flange thicknesses
have slightly increased. Also the raised face dimensions (although
rarely specified, flat face is mostly used) are slightly larger.
Table C, J to R, no longer exist, PN16 is the same drilling as
Table D, PN21 is the same as Table E, PN35 is the same as Table H.
AS4331 covers PN2.5 to PN420 and the sizing and drilling used is a
replication of ISO 7005-1 which in turn is a metricated equivalent
of ASME B16.5 class 150 to 2500. ISO 7005-1 also incorporates the
superceded DIN 2533 & DIN 2501 flanges which AS4331 also
incorporates (also mirrored in EN1092).
British Standard – BS10 | Table D Table E Table F Table G Table H Table J Table K | PN6 PN10 PN16 PN25 PN40 PN64 PN100 | Table E is the most popular for applications with water.
All dimensions are specified in inches. |
Australian Standard – AS2129 | Table C Table D Table E Table F Table G Table H Table J | These flanges are equivalent to the BS10 flanges, except that all
dimensions are specified in mm.
In some sizes, bolt holes are slightly larger to give better
clearance. |
American National Standards Institute (ANSI) | ANSI 125 ANSI 150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500 | Higher numbers denote higher pressures.
Sometimes people use the word ‘Class’ instead of ANSI. e.g. an ANSI
150 flange might be called a ‘Class 150’ All dimensions are specified in inches. |
British Standard – BS4504 | BS4504-6 BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64 BS4504-100 | Engineers use the prefix PN (Pressure Nominale). e.g. a BA4504-16
flange will commonly be referred to as a PN16
Generally, a PN16 flange is designed to withstand pressures up to
16 bar. All dimensions are specified in mm. |
Class of ASME B16.5 and corresponding PN rating
| Flange Class | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
|---|
| Flange Pressure Nominal, PN | 20 | 50 | 68 | 100 | 150 | 250 | 420 |
|---|
Grade Specifications for 316L Stainless Steel
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
|---|
| BS | En | No | Name |
|---|
| 316L | S31603 | 316S11 | - | 1.4404 | X2CrNiMo17-12-2 | 2348 | SUS 316L |
Stainless Steel Flanges
Other types flanges: Threaded Flanges; Weld Neck Flanges; Blind
Flanges; Socket Weld Flanges;
Lap Joint Flanges as well as some special types flanges for
customers.
Flanges Grades
Stainless Steel Flange: F304, F304L, F304H, F316, F316L, F316Ti,
F310, F310S, F321, F321H, F317, F317L, F347, F347H, F904L etc
Duplex Steel Flange: UNS S31803, 2205, S31254 (254SMO)
Super Duplex Steel Flange : UNS S32750, UNS S32760, UNS S32304,
S31500
Carbon Steel Flange: ASTM A105, A105N etc.
Alloy Steel Flange: F1, F11, F22, F5, F9, F91 etc.
Nickel Alloy Flange as below
Monel 400 & K500,
Inconel 600, 601, 617, 625, 690, 718, X-750.
Incolloy 800, 800H, 800HT, 825, 925.
Hastelloy C22, C4, C276, S, C2000, G-30, G-35, X, N, B, B-2, B-3.
Copper Alloys Flanges: Copper, Brass & Gunmetal
Flanges Standard
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642,
DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632,
DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S : BS4504 , BS4504, BS1560, BS10
Besides, we also can supply JIS and Gost standards according to
clients' requirements.
Various Kinds of Flanges we can supply as below
1. Slip-on Flanges.
Slip-on Flanges have a lower initial cost than welding neck flanges
because they require less accuracy in cutting pipe to length, and
they provide a greater ease of alignment in assembly. However,
their calculated strength under internal pressure is approximately
2/3's the strength of welding neck flanges, and their life under
fatigue is 1/3 shorter. Slip-on Flanges are limited to 1/2" to 2½"
sizes in 1500lbs standard.
2. Threaded Flanges
Threaded Flanges are used for special applications. They can be
assembled without welding and can be used in extremely high
pressure services--at or near atmospheric pressure--where alloy
steel is essential for strength. Threaded flanges are not suited
for conditions involving temperature or bending stresses, or under
cyclic conditions where leakage through the threads may occur.
3. Weld Neck Flanges
Weld Neck Flanges have a long tapered hub and gradual transition of
thickness in the region of the butt weld joining them to the pipe.
The tapered hub provides important reinforcement to the flange and
resistance to dishing. This type of flange is preferred for severe
service conditions resulting from high pressure, sub-zero or high
temperatures.
4. Blind Flanges
Blind Flanges are used to blank off the ends of piping, valves and
pressure vessel openings. Blind Flanges can handle high stress from
internal pressure and bolt loading since the maximum stresses in
the blind flange are bending stresses at the center.
5. Socket Weld Flanges
Socket Weld Flanges were developed for use on small size high
pressure piping. With an internal weld, socket weld flanges are
stronger and have greater fatigue strength than double welding a
slip-on flange. Smooth bore conditions can be easily attained by
grinding the internal weld. This flange is commonly used in
chemical process piping.
6. Lap Joint Flanges
Lap Joint Flanges are used with lap joint stubs. Lap joint flanges
are commonly used in carbon or low alloy steel piping systems that
need to be frequently dismantled for inspection and cleaning. They
should not be used at any points where severe bending stresses
occur.
Applications of pipe flanges
Pipe flanges are widely used in pipe fittings of various
industrial, commercial and residential applications. Pipe flanges
can be customized to suit your application with various machining
details. These pipe flanges have been used extensively in:
UHV applications
A. Hydraulic control systems for turbine generators
B. High pressure ground support missile systems
C. Nuclear and conventional power plant applications etc.
