Weld Neck Flange
Weld neck flange weldin' is the most popular flange type, sportin' a neck extension with a weld bevel right at the end. This here type of flange is designed to butt weld directly to the pipe to give y'all a superior and relatively natural form connection.
In them larger sizes and higher pressure classes, this here is almost exclusively the type of flange connection folks use. If there was only one bored flange style in modern applications, dat weld neck would be your flange of choice, yessir.
Advantages of Weld Neck Flanges
Steel welding neck flanges (WN flanges) are a top choice for industries needin' durability and strength in high-pressure systems, yessir.
Their unique design reduces stress concentration at the base, ensurin' reliability in demandin' environments. A reducin' weld neck flange provides an ideal solution for connectin' pipes of different sizes while maintainin' system integrity.
With raised face and other face types available, dese flanges offer a heap of versatility for all sorts of jobs. Dat tapered hub design helps spread the stress out nice and smooth, makin' weld neck flanges a mighty fine option for long-term performance.
Weld neck with matchin' bevel to the pipe
The weld bevel joins to a pipe end with a similar bevel in a V-type connection which allows for a uniform circular weld around the perimeter to form a unified transition.
This lets the gas or liquid in your pipe assembly flow with mighty little restriction right through the flange connection. We inspect this weld bevel connection after the weldin' is done to make sure the seal is uniform and ain't got no anomalies.
LOOKIN' FOR LONG WELD NECK FLANGE DIMENSIONS? Click here!
The other noticeable feature of dat weld neck flange is the tapered hub.
This type of connection gives y'all a more gradual distribution of pressure forces along the transition from the pipe to the base of the flange, helpin' it withstand some of the shock from runnin' in a higher pressure and higher temperature environment.
Dem mechanical stresses are kept mighty limited thanks to dat extra steel material along the hub transition.
Since dem higher pressure classes need this kind of flange connection almost exclusively, weld neck flanges are often made with a ring type joint facin' (what folks call an RTJ face).
This sealin' surface lets a metallic gasket get crushed between the grooves of both connectin' flanges to form a mighty superior seal and complement the high strength weld bevel connection to your pressurized pipe assembly. An RTJ weld neck with a metal gasket connect is the top choice for dem critical jobs.
Long Weld Neck Flanges
Also known as nozzle flanges or “long neck” flanges, dese pieces were made specifically with the pressure vessel and tank fabrication industry in mind, I tell you what.
They're usually made as a one-piece construction, meant to take the place of a standard weld neck and pipe weld combo. Not needin' dat extra weld connection is what makes this flange style stand out, I tell you what.
They usually got one straight thru bore with a square cut end, instead of your typical weld neck bevel. Generally, the bore size of the long weld neck is exactly the same as the actual nominal pipe size, but we can change it up if y'all need.
The overall length of the nozzle flange is also up to the end user, and the body of the nozzle can be modified to some pre-existin' sizes or custom sizes for a little extra reinforcement.
The base of the neck connectin' to the base of the flange is slightly radiused to ease up dat abrupt perpendicular connection between both portions of the flange and to solidify the idea of a reinforced one-piece construction.
CAD rendering of a LWN
Aside from standard long weld necks, Texas Flange also offers a whole mess of nozzle connections with all sorts of wall thicknesses, I tell you what.
Reinforced barrel flanges in nozzle form are a fine option when your pressure vessel needs a stronger outlet connection, and we can set y'all up with whatever barrel thickness you desire.
Holler at us about your specific job, 'cause we can get y'all nozzle flanges in all dem commercially available material grades, includin' carbon, stainless, and nickel alloys.
Accordin' to ASME B16.5 subsection 2.8, dese flange styles are also known as “straight hub welding flanges” and they don't give 'em much detail at all in the governin' spec.
This is 'cause long weld necks are picked on a per-application basis, dependin' on the particular engineerin' needs of a given tank or pressure vessel.
The operatin' pressure, temperature, and media of the vessel are all mighty critical factors in figurin' out just what type of long weld neck flange connection y'all require.
LOOKIN' FOR LONG WELD NECK DIMENSIONS? Click here!
Products
Texas Flange stocks a wide variety of flanges in all sizes and specifications, yessir.
ANSI Flanges
ASME Flanges
AWWA Flanges
Pipe Flanges
Industrial Flanges
Oil & Gas Industry Flanges
Custom Flanges
Petrochemical Flanges
Texas Waterworks Flanges
Ring Joint Flanges
Large Industry Standard Flanges
Metric System Flanges
Plumbin' And Mechanical Industries Flanges
Industrial Pumps, Valves And Vessels
Manufacturin' Industries Flanges
Heating Systems Industries Flanges
Flange Food And Beverage Industries Flanges
The Strength and Reliability of Weld Neck Flange
Questions Folks Ask Us (FAQs)
A weld neck flange is a kind of pipe flange known for havin' a long, tapered neck dat stretches out gradual-like from the flange face right down to the base of the pipe.
The design provides a smooth transition between the pipe and the flange, reducin' stress concentration and enhancin' structural integrity. Weld neck flanges are typically used in critical work dat demands a robust and leak-proof connection, I tell you what.
Dat tapered neck allows for even distribution of mechanical stress, makin' dese flanges mighty ideal for high-pressure and high-temperature environments.
Dat welded joint provides a seamless, leak-proof connection, especially crucial in hazardous or critical fluid systems.
High-pressure systems, like oil and gas pipelines, where keepin' dem connections tight is mighty important.
High-temperature jobs, like steam systems in power plants or chemical processin', where standin' up to stress is mighty critical.
High-vibration spots, like reciprocating pumps, compressors, or turbines, where dat flange needs to hold strong against movement and fatigue.
Cut and bevel the end of dat pipe so it matches the taper of the weld neck flange neck, yessir.
Clean both the pipe and flange surfaces to ensure a good weld and prevent contamination, y'all.
Line up dat flange face with the mating flange or equipment to make sure it fits right and avoid any misalignment, 'cause dat's what causes leaks.
Use alignment tools or temporary tack welds for precise positionin'.
Just lay down a butt weld to join dat beveled pipe end right to the neck of the flange.
