ANSI B16.5, ANSI B16.48 Flanges, also known as flange discs or discs, are sealing components primarily used between pipes and valves, between pipes, and between pipes and equipment. Due to their extensive applications in these connections, any bolted joint with sealing function between two flat surfaces is referred to as a flange. It is a disc-shaped part typically used in pairs.
Flanges usually feature round holes for fixing purposes. When used in pipe connections, a sealing gasket is placed between two flanges, which are then tightened with bolts. Flanges under different pressures vary in thickness and require different bolts. Common materials for flanges include carbon steel, stainless steel, and alloy steel.
Specification
| Name | Flange | |
| Size | 1/2" to 80'', DN15-DN2000 | |
| Type | plate, welding neck, slip-on, threaded, lap-joint, socket welding and blind | |
| Pressure: | ANSI: 150#300# 400# 600# 900# 1500# 2500#; DIN:PN1.0 PN2.5 PN6,PN10,PN14,PN25,PN40,PN64,PN100,PN160, PN250,PN320,PN400; JIS:B2220(30K) JIS2238(40K,63K) JIS3451(F15,F12); BS4504: PN6,PN10,PN16,PN25,PN40; EN1092:PN6,PN10,PN16,PN25,PN63,PN100 | |
| Flange facing: | Raised face, Flat face, Ring Joint face, etc | |
| Standard | ASME,ANSI B16.5; ANSI B16.48; MSS-SP44 DIN2631 EN1092-1 BS4504 BS3293 JIS B2220 DIN 2448 | |
| Material | ASTM | Carbon steel: ASTM A105, A105N, JIS SS400, SF440A, RST37.2/C22.8/P25GH/S235JRG2, Q235/20Mn |
| Stainless steel: ASTM A182 F304/F316/F317/F321 etc. | ||
| Alloy Steel:ASTM A182 F1,F5,F9,F11,F12,F22 etc. | ||
| GB | 10#,20#,20G,23g,20R,Q235,16Mn, 16MnR,1Cr5Mo, 12CrMo, 12CrMoG, 12Cr1Mo | |
| Surface | anti rust black painted, anti rust oil, galvanizing | |
| Packing | In wooded cases or pallets, or as for clients' requirements | |
| Usage | Petroleum, chemical, machinery, boiler,electric power, shipbuilding, papermaking, construction, etc | |
| Certification | API CE and ISO 9001:2015 GOST | |
| Surface finish: | stock finish, spiral serrated, water lines | |
| Process: | forged, ring rolled and heat treatment | |
| Connection: | Welding | |
| Technical: | Forged | |
| Third part inspect | BV, SGS, LOIYD, TUV, and other party alloyed by clients | |
| special design | as your drawing | |
| Mill Test Certificate | EN 10204/3.1B,EN 10204/3.2B | |
| Payment: | T/T OR L/C | |
| Delivery time: | At the earliest, within the period required by customer | |
Classification of Flanges
Given the definition of flanges, it is evident that there are numerous types, which can be categorized from different perspectives:
Integral Flange (IF)
Integral flanges feature a long neck and are typically cast in one piece. They belong to the category of Slip-on Weld Neck Steel Pipe Flanges and are made from materials such as carbon steel, stainless steel, and alloy steel.
Slip-on Flange (FL)
Slip-on flanges are connected to vessels or pipelines via welding. Based on appearance, they can be further classified into:
Plate Type Slip-on Flange (PL)
Slip-on Flange with Neck (SO)
Advantages:
Plate type slip-on flanges (per chemical standard HG20592, national standard GB/T9119, and mechanical standard JB/T81) are easy to source, simple to manufacture, cost-effective, and widely used.
Slip-on flanges with neck comply with national standards, offering convenient on-site installation and eliminating the need for weld seam grinding.
Disadvantages:
Plate type slip-on flanges have poor rigidity and are unsuitable for systems requiring high vacuum, flammable/explosive media, or highly hazardous conditions.
Slip-on flanges with neck have a shorter neck, improving stiffness and load capacity compared to plate type. However, they require more welding work, consume more electrodes, and are unsuitable for high-temperature/high-pressure applications or frequent temperature fluctuations.
Weld Neck Flange (WN)
Also known as Slip-on Weld Neck Flange (WN), this type features a prominent high neck. The wall thickness of the neck gradually matches the thickness and diameter of the pipe being connected, enhancing flange strength.
Advantages:
Resistant to deformation, excellent sealing, and widely applicable.
Suitable for pipelines with significant temperature or pressure fluctuations, high-temperature/high-pressure or low-temperature conditions, and those transporting expensive, flammable/explosive, or toxic gases.
Disadvantages:
Bulky, heavy, expensive, and difficult to install, making them prone to damage during transportation.
Loose Flange (PJ)
Loose flanges can be categorized into:
Weld Neck Loose Flange (PJ/SE)
Slip-on Loose Flange (PJ/RJ)
These are commonly used for non-ferrous metal and stainless steel pipelines. The connection is achieved via welding, and the rotatable design facilitates bolt alignment, making them ideal for large-diameter pipelines or frequently disassembled joints.
Advantages:
Cost-effective when pipe materials are expensive or difficult to weld.
Disadvantages:
Low-pressure resistance and weak weld ring strength (especially when thickness is <3mm).
Threaded Flange (Th)
Threaded flanges have internal threads, requiring external threads on the connected pipe. As non-welding flanges, they offer easy installation and maintenance, making them suitable for pipelines where welding is prohibited.
Advantages:
Ideal for alloy steel flanges with sufficient strength but poor weldability.
Disadvantages:
Unsuitable for extreme temperatures (>260°C or <-45°C) due to potential leakage from thermal expansion/contraction.
Flange Blind (BL)
Also known as blind flange or blank flange, this type has no central hole and is used to seal pipeline ends. Unlike welded caps, blind flanges can be easily removed.
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