LONG WELD
NECK
FLANGES
CONTENTS
Overview
Long Weld Neck Flanges— Manufacturers & Suppliers in India
Manibhadra Metals is a trusted manufacturer, supplier, and exporter of ASME B16.5 Long Weld Neck Flanges (LWN Flanges) in Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys, Titanium, Aluminium, and Copper Nickel. Manufactured to ASME B16.5, ASME B16.47, EN 1092-1, DIN, ANSI, JIS, MSS SP-44, and AWWA C207 standards, our flanges are available in Class 150, 300, 400, 600, 900, 1500, and 2500 pressure ratings.
Long Weld Neck Flanges feature an extended tapered hub that provides excellent stress distribution, high fatigue resistance, and leak-free performance, making them ideal for high-pressure, high-temperature, cryogenic, and critical process applications. Widely used in oil & gas, petrochemical, power generation, marine, LNG, chemical, and offshore industries, our flanges are supplied with EN 10204 3.1/3.2 MTC, PMI reports, and third-party inspection certificates upon request.
| Quick Specification Reference | |
|---|---|
| Product | ASME B16.5 Long Weld Neck Flanges (LWN Flanges) |
| Size Range | 1/2" (15 NB) to 48" (1200 NB), DN10 to DN1200 |
| Standards | ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, DIN, ANSI, BS, JIS, MSS SP-44, API 605, AWWA C207 |
| Pressure Ratings | Class 150, 300, 400, 600, 900, 1500 & 2500 / PN6, PN10, PN16, PN25, PN40 & PN64 |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female (M/F), Tongue & Groove (T&G), Lap Joint Face (LJF) |
| Manufacturing Process | Forged, Heat Treated & CNC Machined |
| Surface Coating | Anti-Rust Oil, Black Paint, Zinc Plated, Cold & Hot Dip Galvanized |
| Available Types | Forged, Heavy Barrel, Self Reinforced, Integral, Threaded & Custom Long Weld Neck Flanges |
| Inspection & Testing | PMI, Hydrostatic Test, Radiography, Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), Dimensional Inspection |
| Test Certificates | EN 10204 3.1 / 3.2 MTC, Raw Material Certificate, NACE MR0175 / MR0103, Third-Party Inspection Report |
| Applications | Oil & Gas, Petrochemical, Chemical, LNG, Power Plants, Refineries, Offshore, Marine & Nuclear Industries |
| Export Markets | USA, Canada, Saudi Arabia, UAE, Oman, Singapore, Malaysia, Indonesia, Thailand, South Korea, Europe & Worldwide |
Overview
How Long Weld Neck Flanges Work
1
Extended Tapered Hub
The hub is significantly longer than a standard WN flange typically 9″ to 24″ tapering from flange-body thickness down to the exact pipe wall schedule. This taper distributes stress away from the weld plane over a much larger area.
2
Self-Reinforced Nozzle
The long hub acts as integral nozzle reinforcement on pressure vessels and drums, eliminating the need for a separate reinforcing pad weld. This simplifies fabrication, reduces heat-affected zones, and improves fatigue resistance at the nozzle junction.
3
Schedule-Matched Bore
Bore is machined to the exact pipe ID for the specified schedule (SCH 40 through XXS). No flow restriction or internal step critical in high-velocity process streams and where crevice corrosion or erosion must be eliminated.
4
Full Radiographic Inspectability
The single butt weld and entire hub length can be fully radiographed by X-ray or UT. Standard for nuclear, sour service (NACE MR0175), and pressure vessel code (ASME VIII) applications requiring 100% weld examination.
PRICE TABLE
Long Weld Neck Flange Reference Price Chart
The prices listed above are indicative and subject to change based on quantity, material grade, and market conditions. For an accurate quotation on Long Weld Neck Flange, please contact our sales team directly.
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| SR NO | CAT | DESCRIPTION | UOM | QNTY (3YRS) | Unit Price USD | Total Cost USD |
|---|---|---|---|---|---|---|
| 1 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0175 | Nos | 2100 | 13.48 | 28,312.200 |
| 2 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0176 | Nos | 2100 | 13.48 | 28,312.200 |
| 3 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0177 | Nos | 2100 | 13.48 | 28,312.200 |
| 4 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0178 | Nos | 2100 | 13.48 | 28,312.200 |
| 5 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0179 | Nos | 2100 | 13.48 | 28,312.200 |
| 6 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0180 | Nos | 2100 | 13.48 | 28,312.200 |
| 7 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0181 | Nos | 2100 | 13.48 | 28,312.200 |
| 8 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0182 | Nos | 2100 | 13.48 | 28,312.200 |
| 9 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0183 | Nos | 2100 | 13.48 | 28,312.200 |
| 10 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0184 | Nos | 2100 | 13.48 | 28,312.200 |
| 11 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0185 | Nos | 2100 | 13.48 | 28,312.200 |
| 12 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0186 | Nos | 2100 | 13.48 | 28,312.200 |
| 13 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0187 | Nos | 2100 | 13.48 | 28,312.200 |
| 14 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0188 | Nos | 2100 | 13.48 | 28,312.200 |
| 15 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0189 | Nos | 2100 | 13.48 | 28,312.200 |
| 16 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0190 | Nos | 2100 | 13.48 | 28,312.200 |
| 17 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0191 | Nos | 2100 | 13.48 | 28,312.200 |
| 18 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0192 | Nos | 2100 | 13.48 | 28,312.200 |
| 19 | FLANGE LONG WELD NECK | FLANGE, WELD NECK, 2IN, SCH-80, 600LBS, CARBON STEEL, ASTM A105, RAISED FACE, ASME/ ANSI B16.5, SOUR SERVICE: NACE MR-0193 | Nos | 2100 | 13.48 | 28,312.200 |
SPECIFICATION TABLE
Long Weld Neck Flange Specifications
Explore the complete technical specifications of Stainless Steel Long Weld Neck Flanges, including available sizes, pressure ratings, international standards, flange face types, coatings, production methods, testing procedures, certifications, applications, and export markets. Manibhadra Metals supplies precision-manufactured Long Weld Neck Flanges for high-pressure and critical piping systems.
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| Specification | Details |
|---|---|
| Stainless Steel Long Weld Neck Flange Specification | Stainless Steel Long Weld Neck Flange Specification |
| ASME B16.5 Long Weld Neck Flanges Size Chart | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
| Long Weld Neck Flange Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Long Weld Neck Flanges, ASME Long Weld Neck Flanges, BS Long Weld Neck Flanges, DIN Long Weld Neck Flanges, EN Long Weld Neck Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
| Long Weld Neck Flanges Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Long Weld Neck Flanges |
| Long Weld Neck Flanges Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Long Weld Neck Flanges |
| JIS long weld neck flange ASME B16.5 | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Long Weld Neck Flanges |
| UNI carbon steel long weld neck flange | 6Bar 10Bar 16Bar 25Bar 40Bar Long Weld Neck Flanges |
| EN ANSI B16 5 long weld neck flange | 6Bar 10Bar 16Bar 25Bar 40Bar Long Weld Neck Flanges |
| Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Long Weld Neck Flanges |
| Most common types of Long Weld Neck Flanges | Forged / Threaded / Screwed / Plate |
| Test Certificates |
EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
| Production technique | Forged, Heat treated and machined |
| Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove |
| Special design |
As per your drawing AS, ANSI, BS, DIN and JIS 15 NB (1/2") to 200 NB (8") Equal and Reducing Configurations |
| Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector |
| Equipment | Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc |
| Origin | Indian / West Europe / Japan / USA / Korean |
| Long Weld Neck Flange manufacturers |
ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc. Long Weld Neck Flanges: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange |
| B.S Standards | BS4504 , BS3293, BS1560, BS10 |
| AS 2129 | Table D; Table E; Table H |
| ANSI, ASME, MSS, API and AWWA Standards | ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings |
| ANSI Standards | ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48 |
| ANSI Standards | ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 |
| American Standard | American standard (ANSI) |
| German Standard | German (DIN) |
| British Standard | British standard (BS) |
| DIN Standards | DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 Long Weld Neck Flanges |
| Other Standards | The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276 |
| Long Weld Neck Flanges Uses & application |
Bitumen upgraders. Heavy oil refineries. Nuclear power (mostly seamless). Petrochemicals and acids. |
| Export to ASME B16.5 Long Weld Neck Flanges | Ireland, Singapore, Indonesia, Ukraine, Saudi Arabia, Spain, Canada, USA, Brazil, Thailand, Korea, Iran, India, Egypt, Oman, Dubai, Peru, etc |
| Material Test Certificates | Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175 |
Materials
Long Weld Neck Flange Material Grades
Explore our complete range of Long Weld Neck Flanges manufactured in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex, Titanium, Copper Nickel, Inconel, Hastelloy, Monel, Aluminium, Nickel, and other special alloys. Manibhadra Metals supplies flanges in accordance with ASTM, ASME, ANSI, DIN, EN, ISO, BS, and JIS standards for critical industrial applications.
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| Material | Standards & Grades |
|---|---|
| Carbon Steel Long Weld Neck Flanges | ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80) |
| Stainless Steel Long Weld Neck Flanges | ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409 |
| Alloy Steel Long Weld Neck Flanges | ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91 |
| Titanium Long Weld Neck Flanges | ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7 ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 | R52400/GR.7 | R53400/GR.12 | R56320/GR.9 | R56400/GR.5 |
| Copper Long Weld Neck Flanges | T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc |
| Copper Nickel Long Weld Neck Flanges | ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600), Cupro Nickel 70/30 (C71500), UNS C71640 |
| Brass Long Weld Neck Flanges | 3602 / 2604 / H59 / H62 / etc. |
| Inconel Long Weld Neck Flanges | ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, X750 Flanges |
| Hastelloy Long Weld Neck Flanges | ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X Flanges |
| Monel Long Weld Neck Flanges | ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500) |
| Alloy 20 Long Weld Neck Flanges | ASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3 |
| Aluminium Long Weld Neck Flanges | 5052 / 6061 / 6063 / 2017 / 7075 / etc. |
| Nickel Long Weld Neck Flanges | ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC |
| Duplex Long Weld Neck Flanges | S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Super Duplex Long Weld Neck Flanges | S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Incoloy Long Weld Neck Flanges | ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925 Flanges |
| 254 SMO Long Weld Neck Flanges | ASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547 |
| Nimonic Long Weld Neck Flanges | Nimonic 75 Long Weld Neck Flange, Nimonic 80A Raised Face Long Weld Neck Flange, Nimonic 90 RTJ Long Weld Neck Flange |
| Other Long Weld Neck Flanges Material | Tin Bronze Long Weld Neck Flange, Aluminium Bronze Long Weld Neck Flange, Lead Bronze Long Weld Neck Flange |
PRODUCT VARIANTS AND SPECIFICATIONS
Long Weld Neck Flange Material Types & Configurations
Explore our complete range of Long Weld Neck Flanges manufactured to ASME B16.5, ASME B16.47, ANSI, EN 1092-1, AWWA C207, and MSS SP-44 standards. Available in RTJ, Flat Face, grooved, reducing, integral, Class 300, Class 1500, PN16, and other configurations for high-pressure, large-diameter, waterworks, and critical process piping applications.
ASME B16.5 Long Weld Neck Flange
ASME B16.5 Long Weld Neck Flange with an extended tapered hub for improved strength and stress distribution. Manufactured for high-pressure, high-temperature, and critical process piping applications.
ASME B16.5 RTJ Long Weld Neck Flange
ASME B16.5 Long Weld Neck Flange with Ring Type Joint facing for severe-service piping. Designed to provide reliable sealing under extreme pressure and temperature conditions.
ANSI B16.5 Slip On Integral Flange
ANSI B16.5 Slip On Integral Flange designed for accurate pipe alignment and dependable installation. Suitable for vessels, process equipment, and general industrial piping systems.
ASME B16.47 Series A Integral Pipe Flange
ASME B16.47 Series A Integral Pipe Flange manufactured for large-diameter and heavy-duty pipelines. Provides high structural strength, secure bolting, and reliable sealing performance.
ASME B16.47 Series B Flat Face Long Weld Neck
ASME B16.47 Series B Long Weld Neck Flange with Flat Face design for large-bore piping systems. Suitable for applications requiring full-face gasket contact and controlled sealing pressure.
Long weld neck flange 1500#
Class 1500 Long Weld Neck Flange manufactured for extremely high-pressure piping service. Commonly used in oil and gas, petrochemical, refinery, offshore, and power-generation installations.
Long weld neck flange dimensions class 300
Class 300 Long Weld Neck Flange manufactured with accurate flange thickness, hub length, bore diameter, bolt-circle diameter, and drilling dimensions. Designed for dependable medium-to-high-pressure service.
Grooved long weld neck EN 1092-1 Type 02
EN 1092-1 Type 02 Grooved Long Weld Neck Flange designed for European-standard piping systems. The grooved face supports precise gasket placement and reliable joint sealing.
PN16 long weld neck
PN16 Long Weld Neck Flange manufactured for nominal pressure applications up to 16 bar. Suitable for water treatment, chemical processing, utilities, and general industrial piping.
Forged integral puddle flange
Forged Integral Puddle Flange designed for pipes passing through concrete walls, tanks, basements, and foundations. Provides a strong barrier against water penetration and leakage.
AWWA C207 Class d reducing long weld neck
AWWA C207 Class D Reducing Long Weld Neck Flange designed for waterworks and large-diameter pipelines. Provides a secure transition between different pipe sizes while maintaining flange alignment.
MSS SP-44 table e long weld neck
MSS SP-44 Table E Long Weld Neck Flange manufactured for large-diameter steel pipelines. Designed to meet specified dimensional, drilling, pressure, and bolting requirements.
Dimensions
ASME B16.5 Long Weld Neck Flange Dimensions
View the dimensional chart for ASME B16.5 Long Weld Neck Flanges, including nominal pipe size, outside diameter, flange thickness, raised face diameter, hub diameter, bore size, length through hub, bolt circle diameter, number of bolts, and bolt-hole diameter. All dimensions are provided in millimetres unless otherwise specified.
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| Pipe | O.D. | Thk. Of Flange | Diameter of Raised Face | Hub Diameter | Diameter of Bore | Length Through Hub | Diameter of Bolt Circle | Number of Bolts | Diameter of Holes | |
|---|---|---|---|---|---|---|---|---|---|---|
| Normal Diameter | Flange | Minimum | Face | At Bevel | Circle | |||||
| inch | O | C | R | A | B | H | H1 | BC | n | d |
| 1/2" | 95.5 | 14.3 | 34.9 | 38.1 | 12.7 | 228.6 | 304.8 | 66.7 | 4 | 15.8 |
| 3/4" | 117.5 | 15.9 | 42.9 | 47.6 | 19.1 | 228.6 | 304.8 | 82.5 | 4 | 19 |
| 1" | 124.0 | 17.5 | 50.8 | 54 | 25.4 | 228.6 | 304.8 | 88.9 | 4 | 19 |
| 1-1/4" | 133.5 | 19.1 | 63.5 | 63.5 | 31.8 | 228.6 | 304.8 | 98.4 | 4 | 19 |
| 1-1/2" | 155.5 | 20.6 | 73 | 69.8 | 38.1 | 228.6 | 304.8 | 114.3 | 4 | 22.5 |
| 2" | 165.0 | 22.2 | 92.1 | 82.5 | 50.8 | 228.6 | 304.8 | 127.0 | 8 | 19 |
| 2-1/2" | 190.5 | 25.4 | 104.8 | 100.0 | 63.5 | 228.6 | 304.8 | 149.2 | 8 | 22.5 |
| 3" | 209.5 | 28.6 | 127.0 | 117.5 | 76.2 | 228.6 | 304.8 | 168.3 | 8 | 22.5 |
| 3-1/2" | 228.5 | 30.2 | 139.7 | 133.4 | 88.9 | 228.6 | 304.8 | 184.1 | 8 | 22.5 |
| 4" | 254.0 | 31.8 | 157.2 | 146.0 | 101.6 | 228.6 | 304.8 | 200.0 | 8 | 22.5 |
| 5" | 279.5 | 34.9 | 185.7 | 177.8 | 127.0 | 228.6 | 304.8 | 234.9 | 8 | 22.5 |
| 6" | 317.5 | 36.5 | 215.9 | 206.4 | 152.4 | 228.6 | 304.8 | 269.9 | 12 | 22.5 |
| 8" | 381.0 | 41.3 | 269.9 | 260.3 | 203.2 | 228.6 | 304.8 | 330.2 | 12 | 25.5 |
| 10" | 444.5 | 47.6 | 323.9 | 320.7 | 254.0 | 228.6 | 304.8 | 387.3 | 16 | 28.5 |
| 12" | 520.5 | 50.8 | 381.0 | 374.6 | 304.8 | 228.6 | 304.8 | 450.8 | 16 | 31.8 |
| 14" | 584.0 | 54 | 412.8 | 425.4 | 355.6 | 228.6 | 304.8 | 514.3 | 20 | 31.8 |
| 16" | 647.5 | 57.2 | 469.9 | 482.6 | 406.4 | 228.6 | 304.8 | 571.5 | 20 | 35.1 |
| 18" | 711.0 | 60.3 | 533.4 | 533.4 | 457.2 | 228.6 | 304.8 | 628.6 | 24 | 35.1 |
| 20" | 774.5 | 63.5 | 584.2 | 587.3 | 508.0 | 228.6 | 304.8 | 685.8 | 24 | 35.1 |
| 24" | 914.5 | 69.9 | 692.2 | 701.6 | 609.6 | 228.6 | 304.8 | 812.8 | 24 | 41.2 |
Note: All dimensions are in millimetres (mm)
PRODUCT RANGE
ANSI B16.5 Long Weld Neck Flange Ratings, Sizes & Lengths
Manibhadra Metals supplies ANSI/ASME B16.5 Long Weld Neck Flanges, HB flanges, specialty nozzles, and studding outlets in multiple sizes, pressure classes, material grades, and custom lengths. Standard products are available from stock, while non-standard dimensions can be manufactured according to customer drawings and project specifications.
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| Size | Rating | Length |
|---|---|---|
| 1/2″ – 24″ | 150# – 1500# | 9″ – 18″ |
| 1/2″ – 12″ | 2500# | 9″ – 18″ |
| Available Material Grades: A105, A105N, SA-350 LF2, 304/304L, 316/316L | ||
| Additional sizes, grades, and lengths are available from manufacturers’ stock, as well as made-to-order items manufactured as per customer drawings. | ||
PRODUCT RANGE
HB Long Weld Neck Flange Size, Rating & Length
HB Long Weld Neck Flanges feature an extended hub and are commonly used for pressure vessels, vessel nozzles, and demanding piping connections requiring additional neck length and structural support.
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| Size | Rating | Length |
|---|---|---|
| 1″ – 24″ | 150# – 1500# | 9″ – 24″ |
| 1″ – 12″ | 2500# | 9″ – 18″ |
| Available Material Grades: A105, A105N, SA-350 LF2, 304/304L, 316/316L | ||
| Additional sizes, grades, and lengths are available from manufacturers’ stock, as well as made-to-order items manufactured according to customer drawings. | ||
PRODUCT RANGE
Specialty Nozzles Size, Rating & Length
View the available size range, pressure ratings, standard lengths, and material grades for Specialty Nozzles used in pressure vessels, tanks, heat exchangers, reactors, and custom process equipment. Additional sizes and lengths are available from stock or can be manufactured according to customer drawings.
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| Size | Rating | Length |
|---|---|---|
| 1″ – 24″ | 150# – 1500# | 9″ – 24″ |
| 1″ – 12″ | 2500# | 9″ – 18″ |
| Available Material Grades: A105, A105N, SA-350 LF2, 304/304L, 316/316L | ||
| Additional sizes, grades, and lengths are available from manufacturers’ stock, as well as made-to-order items manufactured according to customer drawings. | ||
PRODUCT RANGE
Studding Outlets Size, Rating & Length
View the available sizes, pressure ratings, standard lengths, and material grades for Studding Outlets with Flat or Curved Bottoms. These outlets are suitable for pressure vessels, tanks, headers, and custom equipment connections, with additional dimensions available from stock or manufactured as per customer drawings.
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| Size | Rating | Length |
|---|---|---|
| 1/2″ – 24″ | 150# – 1500# | 1 1/4″ – 6 3/4″ |
| 1/2″ – 12″ | 2500# | 2″ – 5 1/2″ |
| Available Material Grades: A105, A105N, SA-350 LF2, 304/304L, 316/316L | ||
| Additional sizes, grades, and lengths are available from manufacturers’ stock, as well as made-to-order items manufactured according to customer drawings. | ||
Manufacturing Materials
Long Weld Neck Flange Standard Manufacturing Materials
Explore the applicable dimensional standards, base materials, and pressure ratings used for manufacturing Long Weld Neck Flanges. Available standards include ASME B16.5, ASME B16.47 Series A & B, API 605, EN 1092-1, BS 4504, and BS 10.
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| Dimensions | Base Material | Pressure Rating |
|---|---|---|
| ASME B16.5 |
ASTM A182 (Forgings) ASTM A240 (Plate) |
150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| API 605 |
ASTM A182 (Forgings) ASTM A240 (Plate) |
150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| ASME B16.47 Series A & B |
ASTM A182 (Forgings) ASTM A240 (Plate) |
150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| EN 1092-1 | ASTM A182 (Forgings) | PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400 |
| BS 4504 |
BS 970 (Bar) ASTM A240 (Plate) ASTM A182 (Forgings) |
PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160 |
| BS 10 |
BS 970 (Bar) ASTM A240 (Plate) ASTM A182 (Forgings) |
— |
PRODUCT RANGE
Stainless Steel Grade Designations & Long Weld Neck Flange Standards
Explore the equivalent ASTM, BS, DIN, and Euronorm designations for common 18/8 stainless steel grades, along with ASME B16.5 Long Weld Neck Flange materials and pressure-rating systems used across American, European, DIN, JIS, UNI, and EN standards.
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| Typical Stainless Steel 18/8 Grade Designations | |||
|---|---|---|---|
| ASTM | BS | DIN | EURONORM |
| 304 | 304S15 | X5 Cr Ni 18 10 | 1.4301 |
| 304L | 304S11 | X2 Cr Ni 18 9 | 1.4307 |
| 316 | 316S31 | X5 Cr Ni Mo 17 12 2 | 1.4401 |
| 316L | 316S11 | X2 Cr Ni Mo 17 13 2 | 1.4404 |
| 321 | 321S31 | X6 Cr Ni 18 10 | 1.4541 |
| 316Ti | 320S31 | X6 Cr Ni Mo Ti 17 12 2 | 1.4571 |
| SMO | 254SMO | X1 Cr Ni Mo Cu N 20 18 7 | 1.4547 |
| Pressure Series | Available Ratings |
|---|---|
| America Series | Class 150, Class 300, Class 600, Class 900A, Class 1500, Class 2500 |
| Europe Series | PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400 |
| ASME B16.5 Long Weld Neck Flanges Material | |
|---|---|
| Material Type | Standards & Grades |
| Carbon Steel | ASTM A105, ASTM A350 LF1, LF2, CL1/CL2, A234, S235JRG2, P245GH, P250GH, P280GHM, 16MN, 20MN, 20# |
| Stainless Steel | ASTM A182, F304/304L, F316/316L |
| Alloy Steel | ASTM A182, A182 F12, F11, F22, F5, F9, F91 etc. |
| Long Weld Neck Flange Standards | |
|---|---|
| Standard | Pressure Ratings |
| ANSI | Class 150 Flanges – Class 2500 Flanges |
| DIN | 6 Bar, 10 Bar, 16 Bar, 25 Bar, 40 Bar |
| JIS | 5K Flanges – 20K Flanges |
| UNI | 6 Bar, 10 Bar, 16 Bar, 25 Bar, 40 Bar |
| EN | 6 Bar, 10 Bar, 16 Bar, 25 Bar, 40 Bar |
TYPES
Explore Other Types Of Flanges
Discover a complete range of flange designs engineered for different pressure classes, piping systems, and industrial applications.
KNOWLEDGE BASE
Frequently Asked Questions
What is a Long Weld Neck Flange?
A Long Weld Neck Flange is a forged flange with an extended tapered hub. It is welded directly to a pipe, vessel, or nozzle and is designed to reduce stress concentration in high-pressure and high-temperature systems.
Where are Long Weld Neck Flanges commonly used?
They are widely used in oil and gas plants, refineries, petrochemical units, pressure vessels, power plants, offshore platforms, LNG facilities, chemical plants, and heavy industrial piping systems.
What standards are available for Long Weld Neck Flanges?
Long Weld Neck Flanges can be manufactured according to ASME B16.5, ASME B16.47 Series A and B, ANSI, EN 1092-1, DIN, BS, JIS, MSS SP-44, API 605, and AWWA C207 standards.
What sizes and pressure classes are available?
Long Weld Neck Flanges are commonly available from 1/2 inch to 48 inches and above in Classes 150, 300, 400, 600, 900, 1500, and 2500. Custom sizes, bores, and neck lengths can also be manufactured according to drawings.
Which materials are used to manufacture Long Weld Neck Flanges?
Common materials include ASTM A105 and A105N Carbon Steel, ASTM A350 LF2, Stainless Steel 304/304L and 316/316L, Alloy Steel, Duplex, Super Duplex, Inconel, Incoloy, Hastelloy, Monel, Titanium, and Copper Nickel.
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