Standard

Flange standard series
  • ANSI - American National Standards Institute 
  • BS - British Standards 
  • DIN - Deutsches Institut für Normung
  • ASME Flange, ASME Forged Flange
  • EN flange, EN flanges
  • AWWA- American Water Works Association

AWWA flanges AWWA - American Water Works Association
+ AWWA Standard flange
Since the first edition of the AWWA Standard C207 was printed in 1952, AWWA flanges have commonly been used in waterworks, wastewater, slurry, plant piping, and other light duty applications. Pressure ratings for AWWA flanges range from the Class B flange rated at 86 psi to the Class F flange rated at 300 psi. The AWWA C207-01 standard describes two types of slip-on flanges, ring type and hub type that may be used interchangeably if the dimensions given in the standard are used. The standard also describes blind flanges. Flanges described in the AWWA C207-01 tables are intended for use with steel pipe, fittings or appurtenances meeting the requirements of ANSI/AWWA C200, ANSI/AWWA C208, ASTM A134, ASTM 139, or other equivalent standards. It is further intended that these flanges be attached by welding in accordance with AWWA C207-01 Sec.4.3. 

 AWWA - American Water Works Association






BS flanges
BS flange is a flange system from England, which have flange type including Welding neck Flanges, Plate Slip-on Flanges, Screwed Boss Flanges, Slip on Boss Flanges, Blind Flanges etc., pressure grade from PN 2.4 to PN 40, Size from 1/2" NB TO 48"NB
  • BS 3293 Class 150 SO
  • BS 3293 Class 300 SO
  • BS 3293 Class 600 SO
  • BS 3293 Class 150 WN
  • BS 3293 Class 300 WN
  • BS 3293 Class 600 WN
Forged Steel Flanges ,Casting Steel Flanges :
BS 4504 SEC 3.1 : WELDING NECK FLANGE(111/134), HUBBED SLIPON FLANGE(112) ,HUBBED THREADED FLANGE(113), LAPPED PIPE END FLANGE(133), PLATE FLANGE(101),LOOSE PLATE FLANGE(102), LOOSE PLATE WITH WELD-NECK FLANGE(104),BLANK FLANGE(105)
Pressure Class : PN2.5 TO PN 40

BS 4504(PART-1) : WELDING NECK FLANGE, HUBBED SLIP-ON HUBBED THREADED, PLATE FLANGE, LOOSE PLATE WITH WELD ON PLATE COLLAR, BLANK FLANGE Pressure Class : PN2.5 TO PN 400
BS1560 : WELDING NECK FLANGE, SOCKET WELDING FLANGE, SLIP-ON BOSS FLANGE, BLIND FLANGE, SCREWED BOSS FLANGE, LAPPED FLANGE.
Pressure Class : 150 , 300 , 400 , 600 , 900, 1500 , 2500
BS 10 : WELDING NECK FLANGE, PLATE SLIP-ON FLANGE, SCREWED BOSS FLANGE, SLIPON BOSS FLANGE,BLIND FLANGE
Table: D, E, F, H

Material:
ASTM A105; ASTM A350, A694 F42/F46/F52/F60/F65
ASTM A182 F304/304L,F316/316L, F321, F310,
ASTM A 182 F51/F53/F55
Size:1/2"-48"
DIN flanges
DIN Flange Manufacturer antong supplies DIN flanges, DIN forged Flange, DIN Flanges in forged steel, Stainless Steel, Carbon steel C22.8, RST37.2, S235JR, P235GH, P245GH, P250GH, ASTM A105, ASTM A182 F304 (1.4306), F304L(1.4307), F316(1.4404), F316L(1.4404), F321(1.4541) etc..
  • DIN 2527 PN16
  • DIN 86029 PN 10
  • DIN 2630 PN 1, 2.5
  • DIN 2631 PN 6
  • DIN 2632 PN 10
  • DIN 2633 PN 16
  • DIN 2635 PN 40
Forged Steel Flanges ,Casting Steel Flanges :
Material:
Carbon Steel: DIN 17175: ST35.8,ST45.8, ST37.2,ST37, DIN 17173: ST35N
Stainless Steel: W.Nr 1.4301, W.Nr 1.4306, W.Nr 1.4401, W.Nr 1.4404, W.Nr 1.4541
Duplex Stainless Steel: W.Nr 1.4362, W.Nr1.4417, W.Nr1.4462, W.Nr1.4460, W.Nr1.4501, W.Nr1.4410, W.Nr 1.4507
ANSI Flanges
ANSI flange(American National Standards Institute) include ANSI B 16.5, ANSI B 16.47 series A SP44, Series B, ANSI 16.36 etc., this standard system include slip on flange, blind flange, welded neck flange, threaded flange, lapped joint flange(loose flange), socket welded flange, Orifice Flanges, long weld neck flange and special flange, sizes from 1/2 inch to 60 inch, class 150, class 300, class 600, class 900, class 1500, class 2500.

Forged Steel Flanges ,Casting Steel Flanges :
ASME/ANSI B16.5 : WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE,HIGH HUB BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.
Pressure Class : 150, 300, 400 , 600 , 900, 1500 , 2500

ASME/ANSI B16.47 : WELDING NECK FLANGE, BLIND FLANGE. (SERIES A & B)
Pressure Class : 75, 150, 300, 400 , 600 , 900
ASME/ANSI B16.36 : (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE.
Pressure Class : 300, 400 , 600 , 900, 1500 , 2500
ASTM/ANSI B16.48:( Figure-8 blanks)
Pressure Class : 150, 300, 400 , 600 , 900,1500, 2500
MSS SP44 : WELDING NECK FLANGE, BLIND FLANGE.
Pressure Class :300, 400 , 600 , 900
API 6A : WELDING NECK FLANGE, THREAD FLANGE,BLIND FLANGE. 
Pressure : 2000Psi, 3000Psi, 5000Psi, 10000Psi, 15000Psi, 20000Psi, 25000Psi

Material:
ASTM A105; ASTM A350, A694 F42/F46/F52/F60/F65
ASTM A182 F304/304L,F316/316L, F321, F310,
ASTM A 182 F51/F53/F55
Size:1/2"-48"

EN flange, EN flanges

EN Flange Manufacturer an-tong supplies EN flanges according to EN 1092-1:2001, EN flanges in forged steel, Stainless Steel, Carbon steel etc. include type of Loose Plate Flanges, Blank Flanges,Weld-neck Flanges etc.

EN flange is a flange system from England, which have flange type including TYPE1(Plate Flanges); TYPE2(Losses Plate Flanges); TYPE5(Blank Flanges); TYPE11(Weld-neck Flanges); TYPE12(Hubbed Slip-on Flanges For Welding); TYPE13(Hubbed Threaded Flanges)etc., pressure grade have PN2.5 PN6 PN10 PN16 PN25 PN40 PN63 PN100, Size from 1/2" NB TO 48"NB

ASME Flange, ASME Forged Flange

ASME Flange include ASME B 16.5, ASME B 16.47 series A SP44, Series B, ASME 16.36 etc., this standard system include slip on flange, blind flange, welded neck flange, threaded flange, lapped joint flange(loose flange), socket welded flange, Orifice Flanges, long weld neck flange and special flange, sizes from 1/2 inch to 60 inch, class 150, class 300, class 600, class 900, class 1500, class 2500.
Type: slip on flange, blind flange, welded neck flange, threaded flange, lapped joint flange(loose flange), socket welded flange, Orifice Flanges, long welded neck flange
Material: Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8, Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
Standard: ANSI,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820
Size: 1/2-60 inch (DN15-DN2000)
Pressure: ANSI class 150,300,600,1500,2500,
Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
E-catalogue: Available , please visit catalogue of flange


Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

Pressure Classes of Flanges

Forged steel , according to , are made in seven primary ratings as 150Lbs, 300Lbs, 400Lbs, 600Lbs, 900Lbs, 1500Lbs, 2500Lbs.
The concept of flange ratings likes clearly. A Class 300 flange can handle more pressure than a Class 150 flange, because a Class 300 flange are constructed with more metal and can withstand more pressure. However, there are a number of factors that can impact the pressure capability of a flange.
The Pressure Class or Rating for flanges will be given in pounds. Different names are used to indicate a Pressure Class.
For example: 150 Lb or 150 Lbs or 150# or Class 150, all are means the same.
Example of Pressure Rating
Flanges can withstand different pressures at different temperatures. As temperature increases, the pressure rating of the flange decreases. For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F.
In other words, when the pressure goes down, the temperature goes up and vice versa. Additional factors are that flanges can be constructed from different , such as stainless steel, cast and ductile iron, carbon steel etc.. Each  have different pressure ratings.
Below an example of a flange NPS 12 with the several pressure classes. As you can see, inner diameter and diameter of the raised face at all the same; but outside diameter, bolt circle and diameter of bolt holes become larger in each higher pressure class.
The number and diameters (mm) of the bolt holes are:
  • Class 150 – 12 x 25.4, Class 300 – 16 x 28.6
  • Class 400 – 16 x 34.9, Class 600 – 20 x 34.9
  • Class 900 – 20 x 38.1, Class 1500 – 16 x 54
  • Class 2500 – 12 x 73
Pressure-Temperature Ratings Example
Pressure-temperature ratings are maximum allowable working gage pressures in bar units at the temperatures in degrees celsius. For intermediate temperatures, linear interpolation is permitted. Interpolation between class designations is not permitted.
Pressure-temperature ratings apply to flanged joints that conform to the limitations on bolting and on gaskets, which are made up in accordance with good practice for alignment and assembly. Use of these ratings for flanged joints not conforming to these limitations is the responsibility of the user.
The temperature shown for a corresponding pressure rating is the temperature of the pressure-containing shell of the component. In general, this temperature is the same as that of the contained fluid. Use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user, subject to the requirements of applicable codes and regulations. For any temperature below -29°C, the rating shall be no greater than the rating shown for -29°C.
As an example, below you will find two tables with material groups acc. to ASTM, and two other tables
with flange pressure-temperature ratings for those ASTM materials acc. to ASME B16.5.
ASTM Group 2-1.1 Materials
Nominal DesignationForgingsCastingsPlates
C-Si(1)A216  r.WCB(1)A515 Gr.70(1)
C-Mn-Si Gr.LF2(1)–A516 Gr.70(1),(2)
C-Mn-Si-VA350 Gr.LF6 Cl 1(3)–A537 Cl.1(4)
3½NiA350 Gr.LF3––
NOTES:
(1) Upon prolonged exposure to temperatures above 425°C, the carbide phase of steel may be converted to graphite. Permissible but not recommended for prolonged use above 425°C.
(2) Do not use over 455°C.
(3) Do not use over 260°C.
(4) Do not use over 370°C.
ASTM Group 2-2.3 Materials
Nominal DesignationForgingsCastingsPlates
16Cr-12Ni-2MoA182 Gr.F316L–A240 Gr.316L
18Cr-13Ni-3MoA182 Gr.F317L––
18Cr-8NiA182 Gr.F304L(1)–A240 Gr.304L(1)
(1) Do not use over 425°C.
Pressure-Temperature Ratings for ASTM Group 2-1.1 Materials
Working pressure by Classes, BAR
Temp.°C15030040060090015002500
-29 to 3819.651.168.1102.1153.2255.3425.5
5019.250.166.8100.2150.4250.6417.7
10017.746.662.193.2139.8233388.3
15015.845.160.190.2135.2225.4375.6
20013.843.858.487.6131.4219365
25012.141.955.983.9125.8209.7349.5
30010.239.853.179.6119.5199.1331.8
3259.338.751.677.4116.1193.6322.6
3508.437.650.175.1112.7187.8313
3757.436.448.572.7109.1181.8303.1
4006.534.746.369.4104.2173.6289.3
4255.528.838.457.586.3143.8239.7
4504.62330.74669115191.7
4753.717.423.234.952.387.2145.3
5002.811.815.723.535.358.897.9
5381.45.97.911.817.729.549.2
Pressure-Temperature Ratings for ASTM Group 2-2.3 Materials
Working pressure by Classes, BAR
Temp.°C15030040060090015002500
-29 to 3815.941.455.282.7124.1206.8344.7
5015.34053.480120.1200.1333.5
10013.334.846.469.6104.4173.9289.9
1501231.441.962.894.2157261.6
20011.229.238.958.387.5145.8243
25010.527.536.654.982.4137.3228.9
3001026.134.852.178.2130.3217.2
3259.325.5345176.4127.4212.3
3508.425.133.450.175.2125.4208.9
3757.424.83349.574.3123.8206.3
4006.524.332.448.672.9121.5202.5
4255.523.931.847.771.6119.3198.8
4504.623.431.246.870.2117.1195.1
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Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.
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Flanges General

Flanges General
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.

Pipe fitting

Pipe fitting
Pipe fitting is work that involves the installation or repair of pipes or tubes. Pipes and tubes are necessary for a wide range of reasons.