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Weld Neck Flange


A weld neck flange, additionally referred to as high hub flange or tapered hub flange, is obtainable in 2 styles specifically regular sort and long sort. The regular sort is beneficial with pipes whereas on the opposite hand, the long sort is beneficial in process plant systems. There’s a circular fitting in an exceedingly weld neck flange that incorporates a projected flange at its boundary. Actually, these weld neck flange undergo typical butt weld process into a pipe and ar machined from a formation. The flange here has range of drill holes which permit the flange get glued to a different flange victimization bolts.
Weld neck flange are brought into use in hostile areas wherever there’s severe pressure, temperature and alternative nerve-racking forces. This sort of flange gets its resilience after you share its stress with the pipe with that it’s welded. They’re additional seemingly to be helpful at pressures up to five,000 psi.

Weld neck flange are brought into use in hostile areas where there is severe pressure, temperature and other stressful forces. This type of flange gets its resilience when you share its stress with the pipe with which it is welded. They are more likely to be useful at pressures up to 5,000 psi.

weld neck flange

A weld neck flange, also called as high hub flange or tapered hub flange, is available in two designs namely regular type and long type. The regular type is useful with pipes while on the other hand, the long type is useful in processing plant systems. There is a circular fitting in a weld neck which has a protruding flange at its boundary. Actually, these weld neck flange go through typical butt weld processing into a pipe and are machined from a forging. The flange here has number of drill holes which allow the flange get affixed to another flange using bolts.




Carbon steel (ASTM A hundred and five and A 181), chrome steel (ASTM A 182 and A 240), steel (ASTM A 182 and GR F1, F11, F22, F5, F9, F91).


Super Duplex chrome steel UNS S32750, F 304, 304L, 304H, 317, 347, 347H, , 316, 316L, 316Ti, 904L, Duplex chrome steel UNS S31803.

Nickel Alloys

Monel four hundred & five hundred, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22, C276

Copper Alloys

Copper, Brass & Bronze

blind flange
blind flange


1/8″ NB TO 48″NB


900#, 1500# & 2500#, ANSI B16.5 category a hundred and fifty, ANSI B16.5 category three hundred, ANSI B16.5 category 600, ANSI B16.5 category 900, ANSI B16.5 category 1500, ANSI B16.5 category 2500


ANSI, ANSI B16.5, ANSI B16.47, DIN2566, DIN2573, DIN2642, DIN2655, DIN2576, DIN2641, DIN2632, DIN2633, DIN2634, DIN2635, DIN2628, DIN2629, DIN2638, DIN2673

Normally, producing of weld neck flange is in varied pressure ratings. As a matter of truth, every category of weld neck projection handles additional pressure than previous category of its construction. Funnily enough, higher the category is, thicker the metal that results in a decent handling of big pressures. The pressure capability of flanges alters once varied factors like the kind of metal used etc. Ironically, because the pressure reduces, the temperature will increase and is so vice-versa.To identify flanges, a troublesome stamp of projection specification is imprint on the outer diameter of the bottom projection. However, the quality and pure mathematics average roughness height (AARH) determines the projection face end. Above all, there are 5 varieties of projection finishes that are as below.

  • Cold water – This can be finished a large tool at quicker speed which supplies mirror like finishing surface or ground surface. It’s a mirror like end. The projection surfaces that have such kind of ends and are helpful in metal to metal applications and not in seal. They’re additionally helpful in oil, chemical and alternative industries.
  • Coaxial saw-Toothed –to build the grove; a ninety degree align angle tool makes a grove of zero.4 metric linear unit deep and zero.2 metric linear unit apart in coaxial circle.
  • Sleek – This can be created in varied varieties of tool shapes and has roughness of end from five to ten small millimeters.
    Spiral saw-toothed – Abundant similar like stock end, the sole distinction is that the methodology of creating grove. Constant ninety degree incline angle tool is beneficial to form a grove zero.4 metric linear unit deep and zero.2 metric linear unit distance.
  • Stock – This type of surface is created employing a continuous spiral groove that contains a roughness of the end vary from five to twenty small millimeters. This can be any cut with a tool having some 1.5 metric linear unit or larger radius.

Flanges that are usually bought into use, have a soft seal squeeze in between the more durable projection surfaces that forms a leak-free seal. Materials used for seal will be rubbers, elastomers (springy polymers), soft metal (copper or aluminum) and soft polymers covering a bouncy metal (e.g., PTFE lined unblemished steel).

Key Features of Weld Neck Flanges

  • Most typical style of air mass projection
  • Long tapered butt weld hub
  • The within diameter of projection matches the within diameter of the pipe used
  • Most popular in Associate in nursing surroundings with high temperature conditions

Types of Weld Neck Flanges

In general, there are 2 styles of weld neck flange particularly customary and long. Customary weld neck flanges area unit helpful in Butt Weld Fittings whereas long weld neck flanges area unit helpful with vessel nozzles for columns or barrels and equipment. The flanges are a in such method or way which makes them match the pipe’s inner diameter. The explanation behind boring a projection to match the pipes inner diameter is simply to confirm sleek flow and scale back corrosion within the pipe. Because the name says, long weld neck flanges even have longer necks than the quality flanges.


How do Weld Neck Flanges work?

When the pipe is weld until the flange neck, these pipe flanges get joint. Further, this ends up in transfer of stress till the pipe from flange. Additionally thereto, it conjointly reduces the gathering of stress at the bottom of the hub. Often employed in areas of high, weld neck flanges have a novel inner diameter that is intended to match inner diameter of the pipe. FittingCart manufactures weld neck flanges having a hub of size varying from 1/2″ through 96″ and conjointly in different material grades, sizes and specifications that embody stainless-steel weld neck flanges, carbon weld neck flanges and alloy weld neck flanges. As a matter of truth, weld neck flanges square measure supplied with a raised face wherever the quality height is 1/16: lesser than 400#, flat face and RTJ facing.With the simplest warehouse and storage facilities, FittingCart has numerous weld neck flanges hold on as outputs and prepared to ship anytime. Our company manufactures ANSI B16.5 weld neck flanges, ASME B16.47 Series “A” and B of weld neck flanges severally, pressure Vessel weld neck flanges and conjointly custom weld neck flanges with shoppers demands.

Applications wherever Weld Neck Flanges are applicable

FittingCart’s Weld neck flanges are helpful in applications at severe and significant applications like air mass, warm temperature, volatile and dangerous fluids and temperatures within the sub-zero vary.At FittingCart, we offer customary connections in big selection of pressure rating sizes and categories that area unit per ASME standards of ASME Section VIII Div. one and ASME B16.5. Furthermore we tend to additionally manufacture connections that match up to ASME Section VIII Div. two and additionally alternative specifications once specifications area unit out there. The opposite styles of weld neck projections that FittingCart manufactures are unit Weld Neck Flat Face Flanges and lift Face Weld Neck Flanges.

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