Welding Neck Flange

Teshi Fittings, a premier manufacturer of pipe fittings, offers high-quality Welding Neck Flanges designed for various industries including Petroleum, Chemical, Hydraulic, Food, and more. Crafted with meticulous precision and adherence to international quality standards, our Welding Neck Flanges provide robust and reliable solutions for high-pressure piping systems. With a commitment to excellence and customer satisfaction, Teshi Fittings delivers superior performance and durability in every flange, offering tailored solutions to meet specific project requirements. Experience the difference with Teshi Fittings’ Welding Neck Flanges and trust in our expertise for all your piping needs.

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Specification
Material & Grades
Dimensions

Standard Specification of Welding Neck Flange

Standards / Dimensions	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, BS, GOST, MSS SP-44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605
Size	1/2″ (15 NB) to 48″ (1200NB)
Flange Face Types / Connection Type	Flat Face Flange (FF), Raised Face Flange (RF), Ring Joint Flange (RTJ), Lap Joint Flange, Male and Female Flange (M&F), Large and Small Tongue-and-Groove Flange (T&G)
Dimensions	ANSI B16.5, ANSI B16.47 Series A & B, ASA, API-605, MSS SP44, AWWA, Custom Drawings
BS	BS4504 , BS4504, BS1560, BS10
Class / Pressure Rating	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Material & Grades of Welding Neck Flange

Stainless Steel	ASTM / ASME 201, 202, 301, 304, 304L, 310, 310S, 316L, 316TI, 317, 317L, 321, 347, 409, 409M, 409L, 410, 410S, 420, 430, 431, 441, 444, 446, 17.4PH, 904L
Duplex & Super Duplex Steel	S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Carbon Steel	ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Low Temperature Carbon Steel	ASTM A350, LF2, LF3
Alloy Steel	ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Nickel Alloy	Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)

Dimension of Welding Neck Flange

ASME B16.5 WELD NECK FLANGE CLASS 150 DIMENSIONS

ø	D	b	g	m	a	J*	h	k	Holes	l	Kg.
1/2″	88,9	11,1	34,9	30,2	21,3	15,7	47,6	60,3	4	15,9	0,500
3/4″	98,4	12,7	42,9	38,1	26,7	20,8	52,4	69,8	4	15,9	0,700
1″	107,9	14,3	50,8	49,2	33,5	26,7	55,6	79,4	4	15,9	1,100
1 1/4″	117,5	15,9	63,5	58,8	42,2	35,1	57,1	88,9	4	15,9	1,500
1 1/2″	127,0	17,5	73,0	65,1	48,3	40,9	61,9	98,4	4	15,9	1,800
2″	152,4	19,0	92,1	77,8	60,3	52,6	63,5	120,6	4	19,0	2,700
2 1/2″	177,8	22,2	104,8	90,5	73,1	62,7	69,8	139,7	4	19,0	4,400
3″	190,5	23,8	127,0	107,9	88,9	78,0	69,8	152,4	4	19,0	5,200
3 1/2″	215,9	23,8	139,7	122,2	101,6	90,2	71,4	177,8	8	19,0	6,400
4″	228,6	23,8	157,2	134,9	114,3	102,4	76,2	190,5	8	19,0	7,500
5″	254,0	23,8	185,7	163,5	141,2	128,3	88,9	215,9	8	22,2	9,200
6″	279,4	25,4	215,9	192,1	168,4	154,2	88,9	241,3	8	22,2	11,000
8″	342,9	28,6	269,9	246,1	219,1	202,7	101,6	298,4	8	22,2	18,300
10″	406,4	30,2	323,8	304,8	273,0	254,5	101,6	361,9	12	25,4	25,000
12″	482,6	31,7	381,0	365,1	323,8	304,8	114,3	431,8	12	25,4	39,000
14″	533,4	34,9	412,7	400,0	355,6	336,5	127,0	476,2	12	28,6	51,000
16″	596,9	36,5	469,9	457,2	406,4	387,3	127,0	539,7	16	28,6	60,000
18″	635,0	39,7	533,4	504,8	457,2	438,1	139,7	577,8	16	31,7	71,000
20″	698,5	42,9	584,2	558,8	508,0	488,9	144,5	635,0	20	31,7	88,000
22″	749,3	46,0	641,2	609,6	558,8	539,7	149,2	692,1	20	34,9	102,000
24″	812,8	47,6	692,1	663,6	609,6	590,5	152,4	749,3	20	34,9	119,000
*	The data “J” corresponds to the STD schedule

ASME B16.5 WELD NECK FLANGE CLASS 300 DIMENSIONS

ANSI/ASME/ASA B16.5 300lb/sq.in. Flange WN-RF

ø	D	b	g	m	a	J*	h	k	Holes	l	Kg.
1/2″	95,2	14,3	34,9	38,1	21,3	15,7	52,4	66,7	4	15,9	0,900
3/4″	117,5	15,9	42,9	47,6	26,7	20,8	57,1	82,5	4	19,0	1,500
1″	123,8	17,5	50,8	54,0	33,5	26,7	61,9	88,9	4	19,0	1,900
1 1/4″	133,3	19,0	63,5	63,5	42,2	35,1	65,1	98,4	4	19,0	2,600
1 1/2″	155,6	20,6	73,0	69,8	48,3	40,9	68,3	114,3	4	22,2	3,300
2″	165,1	22,2	92,1	84,1	60,3	52,6	69,8	127,0	8	19,0	3,600
2 1/2″	190,5	25,4	104,8	100,0	73,1	62,7	76,2	149,2	8	22,2	5,400
3″	209,5	28,6	127,0	117,5	88,9	78,0	79,4	168,3	8	22,2	7,400
3 1/2″	228,6	30,2	139,7	133,3	101,6	90,2	81,0	184,1	8	22,2	8,900
4″	254,0	31,7	157,2	146,0	114,3	102,4	85,7	200,0	8	22,2	11,900
5″	279,4	34,9	185,7	177,8	141,2	128,3	98,4	234,9	8	22,2	16,000
6″	317,5	36,5	215,9	206,4	168,4	154,2	98,4	269,9	12	22,2	20,200
8″	381,0	41,3	269,9	260,3	219,1	202,7	111,1	330,2	12	25,4	31,000
10″	444,5	47,6	323,4	320,7	273,0	254,5	117,5	387,3	16	28,6	44,300
12″	520,7	50,8	381,0	374,6	323,8	304,8	130,2	450,8	16	31,7	64,000
14″	584,2	54,0	412,7	425,4	355,6	336,5	142,9	514,3	20	31,7	88,000
16″	647,7	57,1	469,9	482,6	406,4	387,3	146,0	571,5	20	34,9	113,000
18″	711,2	60,3	533,4	533,4	457,2	438,1	158,7	628,6	24	34,9	134,000
20″	774,7	63,5	584,2	587,4	508,0	488,9	161,9	685,8	24	34,9	171,000
22″	838,2	66,7	641,2	641,2	558,8	539,7	165,1	742,9	24	41,3	195,000
24″	914,4	69,8	692,1	701,7	609,6	590,5	168,3	812,8	24	41,3	238,000
*	The data “J” corresponds to the STD schedule

ASME B16.5 WELD NECK FLANGE CLASS 600 DIMENSIONS

ANSI/ASME/ASA B16.5 600lb/sq.in. Flange WN-RF

ø	D	b	g	m	J	h	k	Holes	l	Kg.
1/2″	95,2	14,3	34,9	38,1	22,3	22,2	66,7	4	15,9	0,800
3/4″	117,5	15,9	42,9	47,6	27,7	25,4	82,5	4	19,0	1,400
1″	123,8	17,5	50,8	54,0	34,5	27,0	88,9	4	19,0	1,600
1 1/4″	133,3	20,6	63,5	63,5	43,2	28,6	98,4	4	19,0	2,100
1 1/2″	155,6	22,2	73,0	69,8	49,5	31,7	114,3	4	22,2	3,100
2″	165,1	25,4	92,1	84,1	62,0	36,5	127,0	8	19,0	3,700
2 1/2″	190,5	28,6	104,8	100,0	74,7	41,3	149,2	8	22,2	5,400
3″	209,5	31,7	127,0	117,5	90,7	46,0	168,3	8	22,2	7,300
3 1/2″	228,6	34,9	139,7	133,3	103,4	49,2	184,1	8	25,4	8,900
4″	273,0	38,1	157,2	152,4	116,1	54,0	215,9	8	25,4	11,800
5″	330,2	44,4	185,7	188,9	143,8	60,3	266,7	8	28,6	24,500
6″	355,6	47,6	215,9	222,2	170,7	66,7	292,1	12	28,6	29,500
8″	419,1	55,6	269,9	273,0	221,5	76,2	349,2	12	31,7	43,000
10″	508,0	63,5	323,8	342,8	276,3	85,7	431,8	16	34,9	70,000
12″	558,8	66,7	381,0	400,0	327,1	92,1	488,9	20	34,9	86,000
14″	603,2	69,8	412,7	431,8	359,1	93,7	527,0	20	38,1	100,000
16″	685,8	76,2	469,9	495,3	410,5	106,4	603,2	20	41,3	142,000
18″	742,9	82,5	533,4	546,1	461,8	117,5	654,0	20	44,4	175,000
20″	812,8	88,9	584,2	609,6	513,1	127,0	723,9	24	44,4	232,000
22″	869,9	95,2	641,2	666,7	564,4	133,3	777,9	24	47,6	292,000
24″	939,8	101,6	692,1	717,5	615,9	139,7	838,2	24	50,8	330,000

Manufacturing process and features of Welding Neck Flange

Manufacturing Process:

Material Selection : Choose appropriate materials based on application requirements, such as stainless steel, carbon steel, or alloy steel.
Cutting : Cut the raw material into the required size using cutting machines or torches.
Forging : Heat the cut material and use forging techniques to shape it into the basic form of a flange. This process enhances the mechanical properties of the material, providing greater strength and durability.
Rough Machining : Perform rough machining to achieve the preliminary shape and size of the flange, including the hub and neck portions.
Heat Treatment : Apply heat treatment processes like annealing, normalizing, or quenching to relieve internal stresses and improve mechanical properties.
Precision Machining : Use CNC machines to perform precision machining on the flange, ensuring accurate dimensions for the bore, face, and bolt holes according to standards like ANSI B16.5.
Drilling Bolt Holes : Drill bolt holes around the flange’s circumference to match the specified bolt pattern. The holes must be accurately positioned and sized for proper alignment and secure connections.
Facing : Machine the flange face to ensure a smooth, flat surface that will provide a tight seal when mated with another flange or sealing surface.
Inspection and Testing : Conduct rigorous inspection and testing, including dimensional checks, visual inspections, and non-destructive testing (NDT) methods like ultrasonic or radiographic testing to ensure quality and reliability.
Surface Finishing : Apply surface treatments like grinding, polishing, or coating to enhance corrosion resistance and improve aesthetics.
Marking and Packaging : Mark the flange with relevant information such as material grade, size, pressure rating, and standards compliance. Carefully package the flanges to protect them during transportation.

Features of Welding Neck Flange :

Tapered Hub : The tapered hub provides a gradual transition from the flange thickness to the pipe wall thickness, reducing stress concentration and providing better strength.
Butt-Weld Connection : Designed for butt-welding to the pipe, ensuring a strong and leak-free connection that can withstand high pressure and temperature.
Long Neck : The long neck provides additional reinforcement, making it suitable for high-stress applications. It also facilitates easier alignment during installation.
Leak-Proof Seal : The smooth, flat flange face provides a reliable sealing surface, ensuring leak-proof connections when mated with a gasket and another flange.
High Pressure and Temperature Resistance : Suitable for high-pressure and high-temperature applications due to its robust design and material properties.
Durability : Made from durable materials and designed to withstand harsh environmental conditions, ensuring long-lasting performance.
Versatility : Available in various sizes, materials, and pressure ratings to meet the needs of different applications and industries.
Precision Engineering : Manufactured to precise dimensional tolerances, ensuring proper fit and alignment with pipes and other flange components.

Welding Neck Flanges are integral components in piping systems, offering strong, reliable, and leak-proof connections. Their manufacturing process involves precision engineering and stringent quality control to meet industry standards and provide dependable performance in high-pressure and high-temperature environments. They are widely used in industries such as oil and gas, chemical processing, power generation, and many others.

Application Of Welding Neck Flange

Oil and Gas Industry	Pipeline Systems: Used in high-pressure and high-temperature pipeline systems for transporting crude oil, natural gas, and refined products. Offshore Platforms: Essential for offshore drilling and production platforms where robust and durable connections are required.
Chemical Processing	Reactors and Pressure Vessels: Employed in reactors, pressure vessels, and other critical equipment where reliable connections are necessary to handle aggressive chemicals and high pressures. Process Piping: Utilized in various chemical process piping systems to ensure leak-free connections and withstand corrosive environments.
Power Generation	Steam Systems: Used in steam lines and other high-temperature and high-pressure systems in power plants, including nuclear, thermal, and hydroelectric plants. Turbine Connections: Important for connecting turbines and associated piping systems, ensuring efficient and safe operation.
Petrochemical Industry	Refineries: Integral in refineries for connecting various processing units, such as distillation columns, heat exchangers, and reactors. Petrochemical Plants: Used in the construction of petrochemical plants where robust and reliable connections are essential.
Shipbuilding and Marine Applications	Ship Piping Systems: Utilized in the construction of ship piping systems, including fuel lines, ballast systems, and cargo transfer systems. Offshore Structures: Essential for offshore structures like oil rigs and floating production storage and offloading (FPSO) units.
Pharmaceutical Industry	Process Equipment: Used in pharmaceutical manufacturing equipment and piping systems to ensure sterile and leak-free connections. Clean Rooms: Employed in clean room environments where contamination-free connections are critical.
Food and Beverage Industry	Hygienic Piping Systems: Applied in hygienic piping systems for transporting food and beverages, ensuring clean and safe connections. Processing Equipment: Used in food processing equipment that requires reliable and sanitary connections.
Water Treatment and Desalination	Water Treatment Plants: Employed in water treatment plants for connecting various treatment units and pipelines. Desalination Plants: Used in desalination plants where reliable and corrosion-resistant connections are necessary for handling saline water.
Mining and Mineral Processing	Slurry Pipelines: Utilized in slurry pipelines for transporting ores and minerals, providing strong and durable connections. Processing Equipment: Employed in mineral processing equipment to ensure reliable and leak-free operation.
HVAC Systems	Chilled Water Systems: Used in HVAC systems for connecting chilled water lines and other high-pressure piping systems. Heating Systems: Applied in heating systems where robust and reliable connections are necessary.

Welding Neck Flange Available Types

Weld Neck Flange Manufacturer	Weld Neck Flange Exporter
Stainless Steel Weld Neck Flange	Forged Steel Raised Face Weld Neck Flange
Carbon Steel Weld Neck Flange	ANSI B16.47 Weld Neck Flange
Alloy Steel Weld Neck Flange Stockholder	Class 150 LBS Weld Neck Flange Stockiest
Nickel Alloy Weld Neck Flange Suppliers	MSS SP44 Weld Neck Flange
Inconel Weld Neck Flange Stockiest	Class 300 LBS Weld Neck Flange
Alloy Steel Weld Neck Flange Exporter	Class 600 LBS Weld Neck Flange
Duplex Steel Weld Neck Flange Stockists	DIN / EN Weld Neck Flange Manufacturers
Titanium Alloy Weld Neck Flange	ASME / ANSI B16.5 WNRF Flange
Super Duplex Steel WNRF Flange	ANSI / ASME Weld Neck Flange
Copper Nickel Weld Neck Flange	High Quality Weld Neck Flange

Others Products

Frequently Asked Questions

Most frequent questions and answers

A welding neck flange is a type of flange that features a long, tapered neck designed to be welded to the end of a pipe. The tapered neck allows for a smooth transition from the pipe to the flange, which helps to minimize stress concentrations and maintain the integrity of the pipeline system.

Welding neck flanges are available in a wide range of sizes to accommodate different pipe diameters and pressure ratings. Standard sizes are offered, and custom sizes can be manufactured to meet specific needs.

Welding neck flanges are installed by aligning the flange’s tapered neck with the pipe and then welding it into place. The weld is typically performed on the inside and outside of the flange to ensure a secure and leak-proof connection. Proper alignment and welding technique are crucial for achieving optimal performance.

Yes, we offer custom manufacturing solutions for welding neck flanges to meet specific requirements. Please contact us with your detailed specifications, and we will work with you to produce flanges tailored to your needs.

The lead time for welding neck flanges depends on the complexity and volume of the order. After reviewing your specifications, we will provide an estimated lead time. We are committed to delivering all projects on schedule while maintaining the highest quality standards.

Yes, welding neck flanges can be used for both liquid and gas applications, provided they are made from appropriate materials and installed correctly to handle the specific conditions of the system, including pressure and temperature.

Welding neck flanges are commonly made from materials such as carbon steel, stainless steel, alloy steel, and other metals. The choice of material depends on the specific requirements of the application, including the type of fluid or gas, temperature, pressure, and environmental conditions.

Welding neck flanges are used in high-pressure and high-temperature applications where a strong and reliable connection is essential. They are commonly found in industries such as oil and gas, petrochemical, power generation, and chemical processing. The design makes them ideal for critical applications where stress distribution and joint integrity are important.

Welding neck flanges are manufactured to comply with various industry standards, such as ASME B16.5, ASME B16.47, and API standards. These standards define the dimensions, tolerances, and material requirements to ensure compatibility and reliability in piping systems.

Welding neck flanges offer several advantages, including:

Stress distribution: The tapered neck helps distribute stress evenly, reducing the risk of failure.
Strong connection: Provides a robust and reliable connection suitable for high-pressure and high-temperature applications.
Smooth transition: Minimizes turbulence and pressure loss due to the smooth transition from the pipe to the flange.
High integrity: Ensures a strong, leak-proof joint when properly welded.

Regular inspection of welding neck flanges involves checking for weld integrity, leaks, and signs of corrosion or damage. It is important to ensure that the welds remain intact and that the flange continues to perform reliably under the conditions of the system.