Welding Neck flange


Welding neck Flange antong supplies weld neck Flanges, WN forged Flange, welding-neck Flanges in forged steel, Stainless Steel, AS,CS etc.

Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification,Weld neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting, but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck flange. The bore of Weld-Neck flange matches bore of the pipeline, reducing turbulence and erosion.

 Details of Welding Neck flange
1. Weld Neck flange 2. Butt Weld
3. Pipe or Fitting
 Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.

The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.

These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
Weld Neck Orifice Run

This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).

Standards, Dimensions & Weight

 Type: WN Forged Flange
Material: Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8, Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
Standard: ANSI,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820
Size: 1/2-78 inch (DN15-DN2000)

Pressure: ANSI class 150,300,600,1500,2500, DIN PN6,PN10,PN16,PN25,PN40,PN64,PN100,PN160
Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
E-catalogue: Available , please visit catalogue of flange
Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

 Stainless Steel : ASTM A 182, A 240

Grade : F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L, Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750

Carbon Steel : ASTM A 105, ASTM A 181

Alloy Steel : ASTM A 182, GR F1, F11, F22, F5, F9, F91

Nickel Alloys : Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276

Copper Alloys : Copper, Brass & Gunmetal

Size : 1/8" NB TO 48"NB.

Class : 150#, 300#,400 #,600#,900#, 1500# & 2500 #.

Standard
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673

B.S : BS4504 , BS4504, BS1560, BS10

The Types and Uses of Weld Neck Flanges

Weld neck flanges have long tapered hubs that are butt welded to a pipe or fitting. The conditions they are used in are usually severe. Conditions are sometimes constant or have wide fluctuations.
The Two Types of Weld Neck Flanges
There are two types of weld neck flanges, which are standard and long. Standard weld neck flanges are used in butt weld fittings. Long weld neck flanges are used with vessel nozzles and equipment. The flanges are created to match the pipe’s inside diameter or fitting. The reason why it is bored to match is because it reduces the corrosion and turbulence that takes place inside of the pipe.
Long Weld Neck Flanges
Long Weld Neck Flange 
Long Neck Welding (abbreviated LWN) flanges are similar to a standard Welding Neck flange, but the "Neck" is considerably longer. This type is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker "Wall".
Long weld neck flanges are called by this name due to their longer neck as compared to standard flanges. These flanges are used in applications as nozzles for columns or barrels.
Applications that Use Weld Neck Flanges
Weld neck flanges are used in applications where the conditions are severe and critical. Some of these conditions include high pressure, wide fluctuations in temperature and pressure, high temperature, fluids that are volatile and hazardous, and temperatures in the sub-zero range.
Meeting ASME Standards
Forged Components offers standard connections in a full range of pressure rating classes and sizes as according to ASME standards of ASME Section VIII Div. 1 and ASME B16.5 in the latest specifications. Connections can also be manufactured to match ASME Section VIII Div. 2 or other specifications desired. ANSI flanges are manufactured according to the material grades and customer’s custom orders.
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Weld Neck Pipe Flanges

Weld neck pipe flanges attach to the pipe by welding the pipe to the neck of the pipe flange.  The allows for the transfer of stress from the weld neck pipe flanges to the pipe itself.  This also reduces high stress concentration at the base of the hub of the weld neck pipe flanges.  Weld neck pipe flanges are often used for high pressure applications.  The inside diameter of a weld neck pipe flange is machined to match the inside diameter of the pipe.  Weld Neck Pipe flanges with a hub have published specifications that range from 1/2" thru 96".  Sunny Steel provides Weld Neck pipe flanges in all material grades, specifications and sizes.

Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ facing.  When a raised face is necessary for weld neck pipe flanges, the standard height is 1/16" for weld neck pipe flanges under 400#.  For weld neck pipe flanges of 400# and up, the standard weld neck pipe flange raised face height is 1/4".

Sunny Steel  manufactures weld neck pipe flanges in all steel material grades, including carbon weld neck pipe flanges, stainless steel weld neck pipe flanges and alloy weld neck pipe flanges.  Sunny Steel  also has many different weld neck pipe flanges in stock and ready to ship.  Weld neck pipe flanges in stock include ANSI B16.5 weld neck pipe flanges, ASME B16.47 Series "A" weld neck pipe flanges, ASME B16.47 Series "B" weld neck pipe flanges, Pressure Vessel weld neck pipe flanges.  Sunny Steel also manufactures custom weld neck pipe flanges per customer requirements.

We have a team of experienced professionals with years of experience in manufacturing. (www.sunnysteel.com)

Sunny Steel Enterprise Ltd.

0086-21-33780199

No. 273, Siping Road, Shanghai, 200081, China

Sum Xuu

sumxu@163.com

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Welding neck flanges



The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design.
Standards, Dimensions & Weight
Specifications:
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Material:
  • Cabon steel: A105, A350 LF2, C22.8, S355JR
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12

Packing: plywood case and plywood pallet
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Ring Joint Facings - ASME/ANSI B16.5 & B16.47-4

Ring joint facing dimensions - ASME/ANSI B16.5
and B16.47 Series A (MSS SP-44) and Series B (API 605) (Continued)
Notes
- Ring joint gasket dimensions conform to ASME B16.20 (not covered in this summary).
- Use Class 600 lb in sizes NPS 1/2 to NPS 31/2 for Class 400 lb.
- Use Class 1500 lb in sizes NPS 1/2 to NPS 21/2 for Class 900 lb.
- Tolerances are as shown in the table below.
1 The height of the raised portion is equal to the depth of groove dimension L, but is not subject to the tolerances for L.
2 Ring joints with lapped flanges in Classes 300 lb and 600 lb use R30 instead of R31.
Ring joint facing tolerances (ASME/ANSI B16.5 and B16.47)
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Welding neck flanges

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design.
Standards, Dimensions & Weight
Specifications:
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Material:
  • Cabon steel: A105, A350 LF2, C22.8, S355JR
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12

Packing: plywood case and plywood pallet
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AWWA Standard flange

Since the first edition of the AWWA Standard C207 was printed in 1952, AWWA flanges have commonly been used in waterworks, wastewater, slurry, plant piping, and other light duty applications. Pressure ratings for AWWA flanges range from the Class B flange rated at 86 psi to the Class F flange rated at 300 psi. The AWWA C207-01 standard describes two types of slip-on flanges, ring type and hub type that may be used interchangeably if the dimensions given in the standard are used. The standard also describes blind flanges. Flanges described in the AWWA C207-01 tables are intended for use with steel pipe, fittings or appurtenances meeting the requirements of ANSI/AWWA C200, ANSI/AWWA C208, ASTM A134, ASTM 139, or other equivalent standards. It is further intended that these flanges be attached by welding in accordance with AWWA C207-01 Sec.4.3.
Dimensional tolerances
Pressure Ratings
As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility services. The pressure ratings for the flange should be based on the design of the maximum operating pressure plus the anticipated sure pressure. Test pressures should not exceed 125 percent of the ratings. Flange design is based on pressure considerations, not for stresses induced by external moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working pressure design.
Flange Material
As per AWWA C207-01, Sec 4.1, flanges shall be made from seamless forgings, cut from plate as a single piece, welded bar rings or segmented and welded plates as per C207-01 Sec 4.2.4.

Forgings shall meet the minimum requirements or ASTM A105 or A181.

Steel plate or bar used in the manufacture of flanges shall meet the following requirements:

  1. Tensile strength = 50,000 psi (345 mpa) (min.)
  2. Yield strength = 32,000 psi (221 mpa) (min.)
  3. Carbon = 0.29 percent (max.)
  4. Phosphorous = 0.04 percent (max.)
  5. Sulfur = 0.05 percent (max.)


Plate steel designations that will meet the previously listed requirements include but are not limited to the following designation:

  1. A36
  2. A516, grade 60, 65, and 70


Pacific Coast Flange Inc will provide mill test reports showing conformance to the physical and chemical requirements for all flanges ordered.
Flange Facing
As per AWWA C207-01 Sec 4.2.2, all AWWA flanges shall be flat-faced without projection or raised area of face. Either a serrated concentric or serrated spiral finish having from 24 grooves per inch to 470 grooves per inch shall be used. The cutting tool employed shall have an approximate 0.06 inch or larger radius. The resultant surface finish shall have a 250 to 500-uin. roughness.
Drilling Templates
As per AWWA C207-01 Sec. 4.2.3 drilling templates are in multiples of four so that fittings can be make to face any quarter. Bolt holes shall straddle the center line, except where special mating conditions exist and shall be drilled 1/8 in. (3.2mm) larger in diameter than the nominal diameter of the bolt, except on flanges larger that 84 inches (2,100mm) diameter, bolt holes shall be drilled 3/16 inches (4.8mm) larger than the nominal bolt diameter. Bolt holes may be over drilled by an additional 1/8 in (3.2mm) to accommodate insulators or to facilitate alignment with the mating flange.
Flange Marking
Flanges shall be steel stamped with the trademark, nominal size, class, material designation and material heat number.

Standards, Dimensions & Weight 

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AWWA Class B-Ring and Blind Flanges

Class B-ring and blind flanges
As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility services. The pressure ratings for the flange should be based on the design of the maximum operating pressure plus the anticipated sure pressure. 
Test pressures should not exceed 125 percent of the ratings. Flange design is based on pressure considerations, not for stresses induced by external moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working pressure design.

Class B-ring and blind flanges
Class B-ring and blind flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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AWWA Class F-Ring and Blind Flanges

As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility services. The pressure ratings for the flange should be based on the design of the maximum operating pressure plus the anticipated sure pressure. Test pressures should not exceed 125 percent of the ratings. Flange design is based on pressure considerations, not for stresses induced by external moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working pressure design.
AWWA Class F-Ring and Blind Flanges

AWWA Class F-Ring and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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AWWA Class E-Hub and Blind Flanges

As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility services. The pressure ratings for the flange should be based on the design of the maximum operating pressure plus the anticipated sure pressure. Test pressures should not exceed 125 percent of the ratings. Flange design is based on pressure considerations, not for stresses induced by external moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working pressure design.
AWWA Class E-Hub and Blind Flanges

AWWA Class E-Hub and Blind Flanges
AWWA Class E-Hub and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges. 
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AWWA Class E-Ring and Blind Flanges

As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility services. The pressure ratings for the flange should be based on the design of the maximum operating pressure plus the anticipated sure pressure. Test pressures should not exceed 125 percent of the ratings. Flange design is based on pressure considerations, not for stresses induced by external moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working pressure design.
AWWA Class E-Ring and Blind Flanges

AWWA Class E-Ring and Blind Flanges
AWWA Class E-Ring and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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AWWA Class D-Hub and Blind Flanges

Since the first edition of the AWWA Standard C207 was printed in 1952, AWWA flanges have commonly been used in waterworks, wastewater, slurry, plant piping, and other light duty applications. Pressure ratings for AWWA flanges range from the Class B flange rated at 86 psi to the Class F flange rated at 300 psi. The AWWA C207-01 standard describes two types of slip-on flanges, ring type and hub type that may be used interchangeably if the dimensions given in the standard are used. The standard also describes blind flanges. Flanges described in the AWWA C207-01 tables are intended for use with steel pipe, fittings or appurtenances meeting the requirements of ANSI/AWWA C200, ANSI/AWWA C208, ASTM A134, ASTM 139, or other equivalent standards. It is further intended that these flanges be attached by welding in accordance with AWWA C207-01 Sec.4.3.
AWWA Class D-Hub and Blind Flanges

AWWA Class D-Hub and Blind Flanges
AWWA Class D-Hub and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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AWWA Class D-Ring and Blind Flanges

The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. This blind flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles.
AWWA Class D-Ring and Blind Flanges

AWWA Class D-Ring and Blind Flanges
AWWA Class D-Ring and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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AWWA Class B-Hub and Blind Flanges

The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. This blind flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles.

AWWA Class B-Hub and Blind Flanges
AWWA Class B-Hub and Blind Flanges
AWWA Class B-Hub and Blind Flanges
1. Ring flanges available overbored or counterbored per customer specification.
2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
4. Flanges available overdrilled to accommodate insulators.
5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
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Dimensional tolerances for AWWA pipe flanges


Listed below are the Dimensional Tolerances to which flanges are manufactured.  These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.  The limits given are maximum.  Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.
Ring type Slip-on and Blind flangesHUB type slip-on
O.D.<=24"+/- 0.6"(1.6mm)O.D.<=24"+/- 0.6"(1.6mm)
>24"+/- .12"(3.2mm)>24"+/- .12"(3.2mm)
I.D.Socket-Welding10" and Samller
+.03"(0.8mm),-0"		I.D.10" and Samller+.03"(0.8mm)
Slip-on and
Lap Joint		12" and Larger
+.06"(1.6mm),-0"		12"-18"+/-.06"(1.6mm)
20"-42"+.12"(3.2mm)
+.06"(1.6mm)
O.D. of Hub<=12"+.09"(2.4mm),
-.06"(1.6mm)		Diameter of
Contact Face		0.06" Raised Face+/-.03"(0.8mm)
14"-42"+/-.12"(3.2mm)
Diameter of Contact face0.06" Raised Face+/- .03"(0.8mm)Diameter of Hub at baseX<=24"+/-.06"(1.6mm)
X>24"+/-.12"(3.2mm)
Deameter of Contact face<=10"+.03"(0.8mm),
-0"		Diameter of Hub at point of Welding<=5"+.09"(2.4mm),
-.03"(0.8mm)
12"-42"+.06"(1.6mm),
-0"		>=6"+.16"(4.0mm),
-.03"(0.8mm)
DrillingBolt Circle1/2"-24"
/26"-42"		DrillingBolt Circle1/2"-24"
/26"-42"
+/-.06"(1.6mm)
+/-.06"		+/-.06"(1.6mm)
+/-.06"
Bolt hole
spacing		+/-.03"(0.8mm)Bolt hole
spacing		+/-.03"(0.8mm)
Eccentricity of Bolt circle with respect to bore.03" Max.
(0.8mm)		Eccentricity of Bolt circle with respect to bore.03" Max.
(0.8mm)
Thickness18"& Small+.12"(3.2mm),-0"Thickness18"& Small+.12"(3.2mm),-0"
20"-42"+.19"(1.6mm)20"-42"+.19"(1.6mm)
Length Thru Hub<=10"+/-.06"(1.6mm)Length Thru Hub<=10"+/-.06"(1.6mm)
12"-42"+/1.12"(3.2mm)12"-42"+/1.12"(3.2mm)
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Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.
You can get in touch by telephone, post, online or E-mail.
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Flanges General

Flanges General
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.

Pipe fitting

Pipe fitting
Pipe fitting is work that involves the installation or repair of pipes or tubes. Pipes and tubes are necessary for a wide range of reasons.