Pipe Flanges

Flanges Manufacturer in India

What is a Flange?

ASME B16.5 Flange Connects Piping And Components In A Piping System By Use Of Bolted Gaskets Or Connections. Flanges are a type of device used by factories to ease cleaning, modifying and inspection of pipes in a piping system. Globally, Pipe Flanges are produced using various standards including ASTM, ASME/ANSI, BS, DIN or even EN. Most Various Used Flanges Are WN Flange, SORF Flange, BLRF Flange, SWRF Flange, Lap Joint Flange Or NPT Flange. ANSI B16.5 Flanges Are Mostly Used For Industrial, Chemical, Gas And Oil Industry, Piping Connection, Water Pipeline System.

What Are The Different Types Of Flanges?

There are several flanges available across different markets across the world. Some of the most common ones include blind flange, slip on flange, socket weld flange, lap joint flange, reducing flange, long neck flange, threaded flange, square flange, orifice flange, loose flange, screwed flange, plate flange, spectacle blind flange, etc.

How To Select Piping Flange?

The selection of flanges depends on several factors like the type of application, the method of joining it to the pipe, properties of the material, size of the pipe and flange, thickness, nominal bore size as well as the outer diameter. These dimensions are important as they aid in proper alignment of the flange to the vessel or even to the pipe. Furthermore, the purpose of the flange is also what decides the type of flange to be used. For instance, if a flow is to be reduced, a reducer flange is best suited for that particular application, whereas if a flow is to be blocked, then buyers may purchase a blind type from any Flanges Manufacturer In India.

How To Choose A Flange Rating?

Flange rating or as referred to as class is the maximum pressure either in psi or bars, which the said flange is able to withstand at elevated temperatures. A higher rating or a higher class is stronger in comparison to flanges that are rated low because they are able to sustain more pressure, despite the increase in temperatures. Once you are able to determine the max working temperature in a piping system, select the max rating based on the temperature level and the maximum pressure you expect in the application.





Top 6 Commonly Type And Used Pipe Flanges


commonly type of flanges


Blind Flanges
Blind Flanges

Blind flanges, unlike it's other counterpart flanges, has no hollow core. The primary function of a blind flange is to seal or shut off a piping system. In addition to being constructed in a standard size, the Carbon Steel BLRF Flange could be customised to meet the requirements of the buyer. The most common material that is highly demanded the manufacture of the ASME B16.5 Blind Flange includes stainless steel and carbon steel.


Slip On Flanges
Slip On Flanges

Forged Steel Slip On Flanges notice an improvement over their wear resistance properties. Next, their impact resistance improves as well. And lastly, because the grain flow of the Stainless Steel Slip On Flange gets aligned to it's form, the end result is a smoother surface.


Socket Weld Flanges
Socket Weld Flanges

ANSI B16.5 Socket Weld Flange is that they are lightweight and are less dense than stainless steel. Being lighter in weight makes the assembly of these flanges faster. This is also a cost-effective metal for use in several applications. Contrary to these steels, the use of SWRF Flange yields properties like higher tensile strength, better resistance to corrosion, longer service life and excellent service.


Weld Neck Flanges
Weld Neck Flanges

Welding Neck Flange, there could be some form of inherent corrosion properties, due to the presence of elements. Although carbon steel could be coated or galvanised to achieve minimal resistance. The Weld Neck Flange Pressure Rating could be anywhere between class 150 to class 2500.


Lap Joint Flanges
Lap Joint Flanges

Lap Joint Flange Manufacturers produce a variety of lap-joint flanges for use in different systems. The Losse flanges belonging to the lap joint Flanges ANSI B16.5 group range from ½ inch to 24 inch in diameter.


Threaded Flanges
Threaded Flanges

There are different types such as the ASME B16.5 Threaded Flanges which could be used to thread in two pipes of different diameters.


Other Flanges

ASME B16.36 Orifice Flange
Orifice Flange

Orifice Flange is used in combination with an orifice meter. This set up is useful while measuring the flow rate of media in the pipeline. The pipeline could have media that is either liquids or gas. There are pairs of pressure Tappings present on the orifice flange. These tappings are located mostly on 2 sides of the Weld Neck Orifice Flange.


ASME B16.48 Spectacle Blind Flange
Spectacle Blind Flange

Usually, ASME B16.48 Spectacle Blind Flange works well in highly corrosive areas. Grades like 316 or as referred to as marine grade steel are useful for marine engineering purposes or for use in coastal regions like docks etc. These areas are susceptible to getting corroded by exposure to salt sprays or seawater.


Reducing Flange
Reducing Flange

Reducing Flange is made up of carbon steel to add to the strength and to make the pipe diameter smaller at connection. Reduction fittings are useful when reducing the volume of fluid flow. There are different dimensions of these flanges. The Reducing Flange is a type of flange falling under the specification that covers the outer diameter ranging from ½ inches to 24 inches and including the pressure class 150 to Class 2500.


Flange Faces

Flange Face Provides A Mean To Mate The Flange With Sealing Element, Top 4 Flange Face Types Are Below

  • Tongue and Grove
  • Flat Face
  • Raised Face
  • Ring Joint
Tongue And Grove
Tongue And Grove

Tongue And Groove Pipe Flanges Are Governed By The B16.5 Standard Which Includes Flanges From ½ Inches Through 24 Inches In Outer Diameter. Flanges Are Specific Metallic Objects With Projections That Allow Them To Be Fitted With Pipes With An Extra Surface For Attachment.


Flat Face
Flat Face Flanges

These properties are far better than the Flat Face Flange. But unlike stainless and alloy steels, carbon steels are tough and they perform well despite being exposed to low-temperature environments.


Raised Face
Raised Face Flanges

Throughout the period of the application, the piping system will accumulate dust particles and would require cleaning. If left untreated, the Raised Face Flange Material could get corroded. For eg. In the oil and gas industry, the fuel passing through pipes has a hydrocarbon base.


Ring Joint
Ring Joint Flanges

Rtj Flange has great resistance to seawater. Hence their use is prevalent in marine engineering. They also have good thermal and electrical conductivity, which is why copper nickel alloy Ring Type Joint (Rtj) Flange Pressure Ratinge are chosen for industries like power generation, where these properties could be put to use.


Flange Marking

Rajveer Stainless And Alloy Flanges

Flange Marking includes ANSI Or ASME Codes

  1. Heat Number (Q0114)
  2. Name of Manufacturer (RSA)
  3. Nominal Pipe Size (WNRTJ 2" SCH 160)
  4. Pressure Class Of Flange (1500#)
  5. Material Designation (A105 B16.5)
  6. Country Name (Made In India)

Flange Bolts

Flange Bolts

Flange Dimensions

CLASS NPS ASTM A182 SORF Flange ASTM A182 NPT Flange ASTM A182 SW Flange ASTM A182 Loose Flange ASTM A182 BLRF Flange ASTM A182 WN Flange
150# ½ 1 1 2 1 2 2
¾ 2 2 2 2 2 2
1 2 2 2 2 2 3
3 3 3 3 3 3
3 3 3 3 4 4
2 5 5 5 5 5 6
8 8 8 8 7 10
3 9 9 9 9 9 11.5
11 12 11 11 13 12
4 13 13 13 13 17 16.5
5 15 15 15 15 20 21
6 19 19 19 19 27 26
8 30 30 30 30 47 42
10 43 43 43 43 70 54
12 64 64 64 64 123 88
14 90 90 90 105 140 114
16 106 98 98 140 180 140
18 130 130 130 160 220 165
20 165 165 165 195 285 197
22 185 185 185 245 355 225
24 220 220 220 275 430 268
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
300# ½ 2 2 3 2 2 2
¾ 3 3 3 3 3 3
1 3 3 3 3 4 4
4.5 4.5 4 4.5 6 5
6.5 6.5 6 6.5 7 7
2 7 7 7 7 8 9
10 10 10 10 12 12
3 13 14 13 14.5 16 18
17 17 17 17 21 20
4 23.5 24 22 24 28 26.5
5 29 31 28 28 37 36
6 39 39 39 39 50 45
8 58 58 58 58 81 69
10 81 81 81 91 124 100
12 115 115 115 140 185 142
14 165 165 165 190 250 206
16 210 220 190 234 315 250
18 253 280 250 305 414 320
20 315 325 315 375 515 400
22 370 370 370 435 640 465
24 490 490 475 550 800 580
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
400# ½ 2 2 2 2 2 3
¾ 3 3 3 3 3 3.5
1 3.5 3.5 3.5 3.5 4 4
4.5 4.5 4.5 4.5 6 4.5
6.5 6.5 6.5 6.5 8 8
2 8 8 8 8 10 10
12 12 12 11 15 14
3 15 15 15 14 20 18
21 21 21 20 29 26
4 26 26 26 25 33 35
5 31 31 31 29 44 43
6 44 44 44 42 61 57
8 67 67 67 64 100 89
10 91 91 91 110 155 125
12 130 130 130 152 226 175
14 191 191 191 210 310 233
16 253 253 253 280 398 295
18 310 310 310 345 502 360
20 378 378 378 420 621 445
22 405 405 405 455 720 505
24 539 539 539 615 936 640
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
600# ½ 2 2 2 2 3 3
¾ 3 3 3 3 4 4
1 4 4 4 4 4 4
5 5 5 5 6 6
7 7 7 7 8 8
2 9 9 9 9 10 12
13 13 13 12 15 18
3 16 16 16 15 20 23
21 21 21 20 29 26
4 37 37 37 36 41 42
5 63 63 63 63 68 68
6 80 80 80 78 86 81
8 115 15 15 112 140 120
10 177 177 177 195 231 190
12 215 215 215 240 295 226
14 259 259 259 290 378 347
16 366 366 366 400 527 481
18 476 476 476 469 665 555
20 612 612 612 604 855 690
22 590 590 590 670 1000 720
24 876 876 876 866 1250 977
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
900# ½ 6 6 6 6 4 7
¾ 6 6 6 6 6 7
1 7.5 7.5 7.5 7.5 9 8.5
10 10 10 10 10 10
14 14 14 14 14 14
2 22 22 22 21 25 24
31 31 31 25 32 31
3 36 36 36 29 35 36
4 53 53 53 51 54 53
5 83 83 83 81 87 86
6 110 110 110 105 115 110
8 172 172 172 190 200 187
10 245 245 245 277 290 268
12 326 326 326 371 415 372
14 400 400 400 415 520 562
16 459 459 459 488 619 685
18 647 647 647 670 880 924
20 792 792 792 868 1107 1164
24 1480 1480 1480 1659 2099 2107
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
1500# ½ 6 6 6 6 4 7
¾ 6 6 6 6 6 7
1 8 8 8 8 9 9
10 10 10 10 10 10
14 14 14 14 14 14
2 25 25 25 25 25 25
36 36 36 35 35 36
3 48 48 48 47 48 48
4 73 73 73 75 73 73
5 132 132 132 140 140 132
6 165 165 165 170 160 165
8 260 260 260 286 302 275
10 436 436 436 485 510 455
12 667 667 667 749 775 690
14 940 940 940 890 975 940
16 1250 1250 1250 1250 1300 1250
18 1625 1625 1625 1475 1750 1625
20 2050 2050 2050 1775 2225 2050
24 2825 2825 2825 2825 3625 3325
CLASS NPS SORF NPT Flanges SW Loose BLRF WN
2500# ½ …. 7 …. 7 7 8
¾ …. 9 …. 8 10 9
1 …. 12 …. 12 12 13
…. 18 …. 17 18 20
…. 25 …. 24 25 28
2 …. 38 …. 37 39 42
…. 55 …. 53 56 52
3 …. 83 …. 80 86 94
4 …. 127 …. 122 133 146
5 …. 210 …. 204 223 244
6 …. 323 …. 314 345 378
8 …. 485 …. 471 533 576
10 …. 925 …. 897 1025 1068
12 …. 1300 …. 1262 1464 1608


Flange Weight

Normal Size Of Pipe Dimensions Weight (Kilogram)
Normal Pipe Size
(Inch)
DN (MM) Flange
MM
Flange
Thick.
SORF
SW
WN BLRF
1/2 15 88.9 11.2 0.4 0.5 0.4
3/4 20 98.6 12.7 0.6 0.7 0.6
1 25 108 14.2 0.8 1 0.9
1 1/4 32 117.3 15.7 1 1.3 1.2
1 1/2 40 127 17.5 1.3 1.7 1.5
2 50 152.4 19.1 2.1 2.6 2.4
2 1/2 65 177.8 22.4 3.3 4.1 3.9
3 80 190.5 23.9 3.9 4.9 4.9
3 1/2 90 215.9 23.9 4.8 6.1 6.2
4 100 228.6 23.9 5.3 6.8 7.0
5 125 254 23.9 6.1 8.6 8.6
6 150 279.4 25.4 7.5 10.6 11.3
8 200 342.9 28.4 12.1 17.6 19.6
10 250 406.4 30.2 16.5 24 28.6
12 300 482.6 31.8 26.2 36.5 43.2
14 350 533.4 35.1 34.6 48.4 58.1
16 400 596.9 36.6 44.8 60.6 76.1
18 450 635 39.6 48.9 68.3 93.7
20 500 698.5 42.9 61.9 84.5 122.0
24 600 812.8 47.8 86.9 115 185.0

Flange Material

ASTM A105 Carbon Steel Flanges

The performance of heat treatments on most carbon steels reduces its yield strength and certain mechanical to some degree. However, with High Yield Carbon Steel Plate Flanges, the heat treatment furnishing like tempering or even quenching on these components does not change its yield strength. Carbon Steel SA105 Pipe Flanges aid in regulating the flow of said media. Unlike fittings, flanges, however, work at a deeper level. First, they not only help during inspections but the ASTM A105 Flanges is useful to make modifications or to even clean the pipe in a system.


Specifications :
  • ASTM : A105 / A105N
  • ASME : SA105, B16.5
  • MSS : SP 44

Chemical Structure

C

Mn

P

S

Si

Cu

Ni

Cr

Mo

V

0.35

0.60-1.05

0.035

0.04

0.10-0.35

0.4

0.4

0.3

0.12

0.08

maximum

maximum

maximum

maximum (1)

maximum (1)

maximum (1-2)

maximum (1-2)

maximum

The sum of Nickel, Copper, Niobium, Vanadium and Molybdenum shall not exceed 1.00%.

The sum of Molybdenum and Niobium shall not exceed 0.32%.


Stainless Steel Flange

The use of stainless steel alloys in process industries is very common because as a metal, it offers several benefits. Depending on its crystalline structure, Stainless Steel Flanges are categorised into four classes, i.e. - austenitic, ferritic, martensitic and duplex steels. Primarily sought after for its economical value, the use of Stainless Steel 304 Flanges is typical in applications that require limited corrosion resistance properties. The 316 Material is made up of nickel chromium and molybdenum to increase strength and corrosion resistance opposed to the ordinary 304 stainless steel.


Specifications :
  • ASTM: A403, A182, A312, A269, A249, A376, A358, A351, A479, A276
  • ASME: SA269, SA276, SA312, SA249, SA182, SA376, SA358, SA403, SA479, SA351

Chemical Equation

C

Cr

Mn

Mo

Ni

P

S

Si

MAX

MAX

Max

MAX

MAX

0.035

16.0- 18.0

2.00

2.0-3.0

10.0-14.0

0.045

0.030

1.00


Flange Temperature Pressure Rating Chart

Working Pressure
Temperature (°C)Class
15030040060090015002500
-29 - 38 19.8 51.7 68.9 103.4 155.1 258.6 430.9
50 19.5 51.7 68.9 103.4 155.1 258.6 430.9
100 17.7 51.5 68.7 103.0 154.6 257.6 429.4
150 15.8 50.2 66.8 100.3 150.5 250.8 418.1
200 13.8 48.6 64.8 97.2 145.8 243.2 405.4
250 12.1 46.3 61.7 92.7 139.0 231.8 386.2
300 10.2 42.9 57.0 85.7 128.6 214.4 357.1
325 9.3 41.4 55.0 82.6 124.0 206.6 344.3
350 8.4 40.0 53.4 80.0 120.1 200.1 333.5
375 7.4 37.8 50.4 75.7 113.5 189.2 315.3
400 6.5 34.7 46.3 69.4 104.2 173.6 289.7
425 5.5 28.8 38.4 57.5 86.3 143.8 239.7
450 4.6 23.0 30.7 46.0 69.0 115.0 191.7
475 3.7 17.1 22.8 34.2 51.3 85.4 142.4
500 2.8 11.6 15.4 23.2 34.7 57.9 96.5
538 1.4 5.9 7.9 11.8 17.7 29.5 49.2

Industry Specification of Flange

  • ASME B16.5 Flange
  • ASME B16.47 Flange
  • AWWA Flange

ASME B16.5 Flange Specification

Every ASME B16.5 Flange prefers the use of these standards as they offer guidance over certain concepts. The concepts chronicled in this standard include its pressure rating, tolerance, marking, testing etc to name a few. Another important area highlighted by the standard is the materials used in the construction of ANSI B16.5 Flange. Since the oil and gas industry is a sector that deals with high velocity transmissions, the pressure applied in the flanges is high.


Difference Between ASME B16.47 Series A and Series B Flange Specification

ASME B16 47 Series A Flange are produced in such a manner that they support the worker for the periodic repair and maintenance of pipes in a system.
Flanges simplify procedural processes like cleaning, modifying as well as inspection of a piping system. Usually, the performance of tasks like these is tedious because it is not a way to restrict or modify the rate of flow in pipes. By making use of good quality ASME 16.47 Series B Flange, it is possible to complete these tasks with much ease.


AWWA Flange

Unlike the other specifications that have certain rules with regards to the materials used in the manufacture of flanges, the AWWA, has a specific set of minimum physical and chemical properties. In addition to the minimum yield strength and tensile strength of the Stainless Steel AWWA C207 Class D Flange, the specification also mentions the contents of carbon, phosphorous as well as sulfur. The chemistry of Awwa C207 Flange must contain a Maximum Carbon content of about 0.29 %, whereas the maximum content of Phosphorus is around 0.04 % and lastly the maximum permissible content of Sulfur is 0.05 %. It is customary for AWWA C207 Class E Flange to stamp these flanges with several details including the trademark, class, nominal size, material designation as well as heat. This standard also mentions tolerances for the AWWA C207 Blind Flange.


Special Flange Materials

Low Temperature Carbon Steel Flanges

ASTM A105, A105N Flanges are an integral part of processing based industries. Most industries, including the oil and gas, water treatment and nuclear power generation make use of pipes, which permit the flow of media across different factory units. The SA350 LF2 Flanges are in the range of ½ inches to 48 inches in nominal diameter. There are different pressure classes ranging from 150 to 2500. The class 1 and 2 flanges can have pressures from 6bars to 40 bars and can come in different finishes such as oil black paint, zinc plated and hot dip galvanized. The difference is that the class 2 flanges have slightly higher mechanical properties.


High Yield Carbon Steel Flange

Over the course of several years, the walls of pipes could either get damaged or in most cases they would require minor repair work. Sometimes, there is chemical silt that is deposited on the walls of these pipes. ASTM A694 F42, F52, F60, F65, F70 Flanges are a means of inspecting, cleaning or even modifying these systems.


Chrome Moly Flanges

What separates these steels from their carbon steel counterparts is their unique chemistry. The chemical makeup of any steel flange is the deciding factor of the properties of the material. Unlike carbon steels which have only two elements, Alloy Steel ASTM A182 F5, F9, F11, F22, F91 Flanges have multiple alloyants in their chemistry. It is precisely the increased elemental count and content that enhances the properties of alloy steels. Though broadly classified as high and low alloy steels, a commonality between them is the type or combination of elements used to alloy them. The most popular metals used to alloy an Alloy Steel Lap Joint Flange includes nickel, chromium, molybdenum, copper, cobalt, sulfur, vanadium and tungsten.