Long weld neck flanges (LWN) are similar to weld neck flanges, with the exception that the neck (tapered hub) is extended and acts like a boring extension.
Long weld neck flanges are generally used on vessels, columns or barrels. These flange types are available also in the heavy barrel (HB) and equal barrel (E) types
A long weld neck flange LWN flange is a type of flange that has a long tapered neck that extends from the flange face to the pipe This longer neck provides more support to the pipe at the weld joint making it a more robust and reliable connection LWN flanges are typically used in highpressure and hightemperature applications such as in the oil and gas industry
Technical Specifications
Dimensions 12 to 24 in diameter
The neck length is typically 15 to 2 times the flange diameter
Materials Carbon Steel Stainless Steel or Alloy Steel
Pressure ratings 150 psi to 2500 psi
Temperature ratings 200F to 1000F
Types RFFFRTJ
LWN flanges are used in a variety of applications including
Oil and gas industry
Chemical industry
Power generation
Water treatment
HVAC
The benefits of using LWN flanges include
Increased strength and reliability
Longer service life
Wider range of applications
Easier to assemble and disassemble
Long-necked flanges, also known as LWN flanges, are similar to the standard weld neck flanges but the neck is considerably longer. This type of flange is often used as a nozzle for a barrel or a column. They can be classified later as standard type, heavy gun type, variable body type and whole body type. These flanges are kind of exclusive for the reason of their uncomplicated connectivity with other pipes. Where standard weld neck flanges are used extensively for pipes, long weld neck flanges (often abbreviated to LWN) are used in high pressure and high (or fluctuating) temperature situations primarily in the oil and gas industry. The long neck guides the pipe into the flange itself and provides reinforcement that a standard weld neck flange cannot. This reinforcement is very important for safety in high pressure industrial, commercial and even residential systems.
Uses of long-necked flanges are primarily on vessels where an elongated neck is required. Long-necked flanges (LWN) are primarily utilised on vessels where an elongated neck is required. This is considered a specialty flange because of the protruding neck or hub, which acts as a boring extension.
The conical collar helps reduce the thickness of the steel and appears to be a pipe extension. LWN steel flanges are used primarily in the chemical and petroleum industries, as well as in commercial and residential buildings ASME 16.47 anf asme 16.5 series of long weld flanges are used exclusively for situations in high levels of stress and fluctuating temperatures.
Flanges used for steel pipeâ??s connection are various. So we should make our flanges lead to the purpose of our steel pipes like seamless or erw steel pipe. So we need to do some lesson before purchase.
Function of long weld neck flanges is predominantly on vessels. We know that vessels have some places need an extended neck so flange can do this job for us. The purpose of tapered neck is to reduce the thickness of the steel and it then seems to be a pipe extension. The combination of steel pipe and long weld neck flange would make the whole engineering project easy and convenient. Utilized in the chemical and petroleum industries, as well as commercial and residential buildings that experience high levels of stress and temperatures that fluctuate, flanges have played an important part during our daily life.
Made available by us is a wide and commendable range of Weld Neck Flanges (WNRF). All our products comes with welding neck, which is hot formed from a circular section of steel plate having a small co-axial hole in the center due to which these are durable. These products find their wide applications in engineering and construction industries because of rustproof construction, excellent finishing and lightweight.
Specifications:
Stainless Steel: ASTM A 182 and A 240
Grade: F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L
Duplex Stainless Steel: UNS S31803 and 2205
Super Duplex Stainless Steel: UNS S32750
Carbon Steel: ASTM A 105 and ASTM A 181
Alloy Steel: ASTM A 182, GR F1, F11, F22, F5, F9 and F91
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22 and C276
Copper Alloys: Copper, Brass & Gunmetal
Size: 1/8\\\\\\\" NB to 48\\\\\\\"NB
Class: 150, 300, 400, 600, 900, 1500 & 2500
Made available by us is a wide and commendable range of Weld Neck Flanges (WNRF). All our products comes with welding neck, which is hot formed from a circular section of steel plate having a small co-axial hole in the center due to which these are durable. These products find their wide applications in engineering and construction industries because of rustproof construction, excellent finishing and lightweight.
Specifications:
Stainless Steel: ASTM A 182 and A 240
Grade: F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L
Duplex Stainless Steel: UNS S31803 and 2205
Super Duplex Stainless Steel: UNS S32750
Carbon Steel: ASTM A 105 and ASTM A 181
Alloy Steel: ASTM A 182, GR F1, F11, F22, F5, F9 and F91
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22 and C276
Copper Alloys: Copper, Brass & Gunmetal
Size: 1/8" NB to 48" NB
Class: 150, 300, 400, 600, 900, 1500 & 2500
A weld neck flange is a type of flange that is joined to a piping system by butt welding. The flange consists of a circular fitting with a protruding rim around the circumference. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts. The flange also has a long tapered hub that gradually meets the wall thickness of the pipe or fitting.
Technical Specifications:
Materials: Carbon steel, stainless steel, duplex steel, alloy steel, etc.
Dimensions: 1/2" to 24"
Class range: Class 150 to 2500 (ANSI/ASME B16.5)
Type: RF,FF,RJT
PN range: PN 2.5 to PN 250
Hub length: Short hub (SH), Long hub (LH), Extra long hub (XH)
Finish: Black, mill finish, painted, etc.
Advantages of Weld Neck Flanges:
Increased strength and durability
Reduced stress concentration
Smooth transition from flange thickness to pipe or fitting wall thickness
Easy to radiograph for flaw detection
Can be used in high pressure and high temperature applications
Applications:
Power plants
Chemical plants
Oil and gas industries
Water treatment plants
HVAC systems
Other industrial applications
