Flanges,also refer to PIPE Flanges,which are components used in piping systems to connect pipes, valves, fittings, and other equipment. They provide a method for joining and sealing piping systems. Flanges come in various materials, sizes, pressure ratings, and configurations to suit different applications and requirements. Common types of PIPE Flanges include weld neck, slip-on, socket weld, threaded, blind, and lap joint flanges. They are used across industries such as oil and gas, petrochemical, chemical processing, power generation, and water treatment.
Flanges are manufactured to various standards
- ANSI/ASME B16.5: This standard covers dimensions, tolerances, materials, marking, and testing for pipe flanges and flanged fittings in sizes NPS 1/2 through NPS 24. It includes pressure-temperature ratings for various materials and flange classes.
- ANSI/ASME B16.47: This standard provides dimensions and ratings for large diameter steel flanges (NPS 26 through NPS 60). It is divided into two series: Series A (MSS SP-44) and Series B (API 605).
- EN 1092: This European standard specifies requirements for circular steel flanges in nominal sizes DN 15 to DN 4000. It includes flange types such as plate (type 01), loose plate (type 02), blind (type 05), and weld neck (type 11).
Flanges are available in various materials, each chosen based on factors such as the application’s requirements, operating conditions, and compatibility with the fluid or gas being transported. Some common materials used for manufacturing flanges include:
- Carbon Steel: Carbon steel flanges are widely used in various industries due to their affordability, strength, and versatility. They are suitable for low- to moderate-pressure applications and are available in different grades such as ASTM A105 for forged carbon steel flanges and ASTM A694 for high-yield carbon steel flanges.
- Stainless Steel: Stainless steel flanges offer excellent corrosion resistance and are ideal for applications where hygiene, durability, and resistance to corrosion are essential. Common stainless steel grades used for flanges include 304/304L, 316/316L, 317/317L, 321/321H, and 347/347H.
- Alloy Steel: Alloy steel flanges are suitable for high-pressure and high-temperature applications. They offer enhanced mechanical properties and are available in various alloy compositions to meet specific requirements. Common alloy steel grades used for flanges include ASTM A182 F5, F9, F11, F22, and F91.
- Duplex and Super Duplex Stainless Steel: Duplex and super duplex stainless steels offer a combination of high strength and corrosion resistance, making them suitable for demanding applications in industries such as oil and gas, chemical processing, and marine environments.
- Nickel Alloys: Nickel alloy flanges are used in extreme environments where corrosion resistance and high-temperature resistance are critical. Nickel alloys such as Inconel, Monel, Hastelloy, and Alloy 20 are commonly used for flange applications in chemical processing, aerospace, and offshore industries.
- Titanium: Titanium flanges are lightweight, corrosion-resistant, and offer excellent strength-to-weight ratio. They are used in aerospace, marine, and chemical industries where corrosion resistance and weight reduction are essential.
| NO. | Material Grade | Category | NO. | Material Grade | Category |
|---|---|---|---|---|---|
| A.Cr-Mo Alloy | C.Duplex | ||||
| 1 | ASTM A182 F1 | Cr-Mo Alloy | 27 | ASTM A182 F44 | Duplex SS |
| 2 | ASTM A182 F5 | Cr-Mo Alloy | 28 | EN10222 1.4462 | Duplex SS |
| 3 | ASTM A182 F9 | Cr-Mo Alloy | D.Stainless Steel | ||
| 4 | ASTM A182 F11 | Cr-Mo Alloy | 29 | ASTM A182 F304/F304L | Austenitic SS |
| 5 | ASTM A182 F22 | Cr-Mo Alloy | 30 | ASTM A182 F304H | Austenitic SS |
| 6 | ASTM A182 F91 | Cr-Mo Alloy | 31 | ASTM A182 F316/316L | Austenitic SS |
| 7 | EN10222-2 16Mo3 | Cr-Mo Alloy | 32 | ASTM A182 F317/317L | Austenitic SS |
| 8 | EN10222-2 13CrMo4-5 | Cr-Mo Alloy | 33 | ASTM A182 F316Ti | Austenitic SS |
| B.Carbon Steel | 34 | ASTM A182 F321 | Austenitic SS | ||
| 9 | ASTM A105 | Carbon Steel | 35 | ASTM A182 F347/F347H | Austenitic SS |
| 10 | ASTM A694 F52 | Carbon Steel | 36 | ASTM A182 F904L | Super Austenitic SS |
| 11 | ASTM A694 F60 | Carbon Steel | 37 | ASTM A182 F347/F347H | Austenitic SS |
| 12 | ASTM A694 F65 | Carbon Steel | 38 | EN10222-2 1.4306 | Austenitic SS |
| 13 | ASTM A694 F70 | Carbon Steel | 39 | EN10222-2 1.4401 | Austenitic SS |
| 14 | ASTM A516 GR 65 | Carbon Steel | 40 | EN10222 1.4404 | Austenitic SS |
| 15 | ASTM A516 GR 70 | Carbon Steel | 41 | EN10222 1.4541 | Austenitic SS |
| 16 | EN10222-2 S235JRG2 | Carbon Steel | 42 | EN10222 1.4571 | Austenitic SS |
| 17 | EN10222-2 P250GH | Carbon Steel | 43 | EN10222 1.4539 | Super Austenitic SS |
| 18 | EN10222-2 P280GH | Carbon Steel | Alloy | ||
| 19 | EN10222-2 P355QH | Carbon Steel | 44 | B564 UNS N08020 | Ni-Alloy |
| 20 | ASTM A516 GR 60 | Low Temp CS | 45 | B564 UNS N04400 | Ni-Alloy |
| 21 | ASTM A350 LF2 | Low Temp CS | 46 | B564 UNS N6600 | Ni-Alloy |
| 22 | ASTM A350 LF3 | Low Temp CS | 47 | B564 UNS N06625 | Ni-Alloy |
| 23 | ASTM A350 LF6 | Low Temp CS | 48 | B564 UNS N08367 | Ni-Alloy |
| C.Duplex | 49 | B564 UNS N08800 | Ni-Alloy | ||
| 24 | ASTM A182 F51 | Duplex SS | 50 | B564 UNS N08825 | Ni-Alloy |
| 25 | ASTM A182 F60 | Duplex SS | 51 | B564 UNS N10276 | Ni-Alloy |
| 26 | ASTM A182 F53 | Duplex SS | 52 | ASTMB171 UNS C71520 | Cu-Alloy |