DIPTI METAL INDUSTRIES
Long Weld Neck Flange (LWNF/LWRF/LWRTJ) Manufacturer, Long Weld Neck Flange Importer, Long Weld Neck Flange Stockist, Long Weld Neck Flange Supplier & Long Weld Neck Flange Exporter in Mumbai, India | Extended Neck Flanges for Vessel Nozzles & High-Pressure Piping
Dipti Metal Industries, a Worldwide recognized, Largest, Best, and Top Long Weld Neck Flange (LWNF/LWRF/LWRTJ) Manufacturer, Long Weld Neck Flange importer, Long Weld Neck Flange stockist, Long Weld Neck Flange supplier, Long Weld Neck Flange exporter, Long Weld Neck Flange dealer, Long Weld Neck Flange distributor, and Long Weld Neck Flange trader from Mumbai, India, specializes in the fabrication and supply of high-integrity Long Weld Neck Flanges. The LWNF features an extended, tapered hub (neck) that is butt-welded to the vessel nozzle or pipe end, providing a superior method for attaching the flange to equipment walls, tanks, and shell-and-tube heat exchangers.
The primary advantage of the Long Weld Neck design is its ability to reduce stress concentration at the junction, making it the preferred choice for applications involving high pressure, temperature fluctuations, and critical cyclic service. We offer a full range of LWNF types, including **LWRF** (Long Weld Neck Raised Face) and **LWRTJ** (Long Weld Neck Ring Type Joint), across all major pressure classes (ASME Class 150# to 2500#, EN PN6 to PN400) and materials, notably Carbon Steel (A105N), Alloy Steel (A182 F22/F91), and Stainless Steel (A182 F304/F316). Dipti Metal Industries ensures certified quality and prompt global supply.
Overview: Dipti Metal Industries - Your Leading Long Weld Neck Flange Manufacturer & Supplier
Dipti Metal Industries stands as a prominent global manufacturer and supplier of premium **Long Weld Neck (LWN) Flanges** from our advanced manufacturing and stocking facilities in Mumbai, India. We are a recognized leader in delivering high-quality piping components specifically for critical vessel connections worldwide. Our robust manufacturing capabilities, coupled with an unparalleled global sourcing network and extensive inventory, ensure every product rigorously adheres to international standards such as ASME B16.5, EN 1092-1, API, DIN, JIS, ASTM, AISI, and NACE. This unwavering commitment guarantees superior integrity, optimal stress distribution, and exceptional corrosion resistance for even the most demanding industrial applications globally, positioning us as the preferred partner for comprehensive long weld neck flange solutions.
Our high-quality Long Weld Neck Flanges are meticulously engineered, manufactured, and supplied for critical connections in pressure vessels, columns, or specialized heat exchangers. They excel in applications subjected to severe stresses, high temperatures, or critical fatigue conditions, providing a smooth transition and enhanced structural integrity across oil & gas, petrochemical, power generation, marine, and various process industries. As a leading global manufacturer and exporter, we are dedicated to delivering superior products with prompt and efficient service, reinforcing our reputation as a trusted partner for long weld neck flanges. We ensure our extensive range of LWN flanges are fit for purpose, delivering exceptional value and performance.
Long Weld Neck Flange Design and Performance Advantages
The unique geometry of the Long Weld Neck Flange provides substantial engineering and performance benefits, especially when compared to simpler flange types like Slip-On or Lap Joint in severe service.
LWNF Key Design Features
- **Extended Tapered Hub:** The most distinguishing feature; the length is typically customized to match the vessel/nozzle specification.
- **Stress Minimization:** The gradual transition in thickness from the long hub to the flange ring minimizes stress intensification factors at the weld joint.
- **Bore Matching:** The bore diameter of the neck matches the inner diameter of the connecting pipe/nozzle, ensuring optimal flow characteristics and reducing turbulence.
- **Facings:** Available with **Raised Face (LWRF)** for standard sealing and **Ring Type Joint (LWRTJ)** for superior, high-pressure sealing.
LWNF Performance Advantages
- **High Integrity:** Preferred for critical services involving extreme temperatures, thermal cycling, and high-pressure fluid.
- **Vessel Nozzle Integration:** The ideal choice for equipment nozzle connections, where the flange acts as a structural extension of the vessel wall.
- **Improved Fatigue Resistance:** Better performance under cyclic loading and bending stress compared to all other flange types.
- **Radiographic Inspection:** The extended neck allows for easy access for Radiography (RT) of the critical butt-weld joint.
Materials and Pressure Classes for Long Weld Neck Flanges
As a leading Long Weld Neck Flange Manufacturer, Dipti Metal Industries offers a comprehensive range of materials and all suitable pressure classes, ensuring the ideal forging for any demanding temperature, pressure, and corrosive environment.
Available Flange Materials (Forging Grade)
- **Carbon Steel:** ASTM A105, A350 LF2 (Low Temp), A350 LF3, A694 F52-F70 (High Yield)
- **Alloy Steel (Cr-Mo):** ASTM A182 F11, F22, F91 (High Temp/Creep Service)
- **Stainless Steel:** ASTM A182 F304/304L, F316/316L, F321, F347, F904L
- **Duplex & Super Duplex:** ASTM A182 F51 (2205), F53 (2507), F55 (S32760)
- **Nickel Alloys:** Monel, Inconel, Hastelloy grades (Per ASTM B564) - View Flanges
Pressure Ratings & Facing Types
- **ASME B16.5:** Class 150#, 300#, 400#, 600#, 900#, 1500#, **2500#**
- **ASME B16.47 Series A & B:** Pressure ratings from Class 150 to Class 900
- **EN 1092-1:** PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400
- **Facing Types:** **Raised Face (LWRF)**, **Ring Type Joint (LWRTJ)**, Flat Face (LWFF)
- **Size Range:** NPS 1/2" to NPS 60" (DN15 to DN1500)
Long Weld Neck Flange Products & Manufacturing Capability
Dipti Metal Industries offers comprehensive manufacturing and supply capabilities for all types of Long Weld Neck Flanges, ensuring custom specifications can be met with the highest quality forgings.
LWNF Technical Standards & Compliance
- **Dimensional:** ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, DIN, JIS
- **Forging Grade:** ASTM A105/A105N, A350 LF2, A182 (F5, F11, F22, F91, F304/L, F316/L)
- **Bolting Supplied:** Matched to ASTM A193/A320 for temperature/pressure ratings.
- **Custom Design:** Manufacture to specific client drawings and **LWRF** dimensions.
Related Flange Products We Supply
- **Weld Neck Flanges** (WNRF/WNRTJ) - View Product
- **Blind Flanges** (BLRF/BLRTJ) - View Product
- **Custom Plates/Rings** - Stainless Steel Forged Rings
- **Flange Accessories** - RTJ Gaskets & A193 Bolting
Key Applications of Dipti Metal Industries' Premier Long Weld Neck Flanges
Due to their design stability and superior integrity, Long Weld Neck Flanges are specified for the most demanding applications in capital-intensive projects worldwide. We Manufacture and supply to:
- **Pressure Vessels & Columns:** The preferred flange type for attaching nozzles to vessel walls in petrochemical, chemical, and gas processing plants.
- **Heat Exchangers:** Widely used on the shell side of shell-and-tube heat exchangers to manage thermal stress and pressure fluctuations.
- **Boiler & Power Plants:** Essential for connections in critical steam and water circuits where high temperatures and thermal shock are present.
- **High-Pressure Piping Headers:** Used in headers or manifolds where severe cyclic stresses are anticipated, and structural reinforcement is required.
As a Worldwide recognized LWNF Manufacturer and Supplier, Dipti Metal Industries ensures our products meet the exacting quality demands of these mission-critical sectors.
Key Quality & Testing Standards for Long Weld Neck Flanges
Dipti Metal Industries, a Top LWNF Flange Manufacturer, Importer, Stockist and Supplier, ensures that all our Long Weld Neck Flanges undergo rigorous in-house testing and are supplied with comprehensive certifications. This commitment guarantees superior quality, full material traceability, and unparalleled reliability for critical applications worldwide.
Our LWNF products comply with the following core dimensional specifications:
- **ASME B16.5:** Pipe Flanges and Flanged Fittings (up to NPS 24).
- **ASME B16.47:** Large Diameter Steel Flanges (NPS 26 through NPS 60).
- **ASTM A105 / A182 / A350:** Governing material specifications for Carbon, Stainless, and Alloy Steel Forgings.
- **API 6A:** Specification for Wellhead and Christmas Tree Equipment (for high-pressure, specialty flanges).
We ensure full material traceability and documented quality assurance through mandatory certifications and optional inspection services:
- **ISO 9001:2015:** Our Manufacturing and supply processes are managed under an ISO 9001 certified quality management system.
- **EN 10204 3.1 / 3.2:** All products are supplied with mandatory EN 10204 3.1 MTCs. EN 10204 3.2 with Third-Party Inspection (TPI) is available on request.
- **Non-Destructive Testing (NDT):** Ultrasonic Testing (UT) on the flange body and neck is common for high-pressure classes.
- **Weld Integrity:** The butt-weld end of the neck is prepared for Radiographic Testing (RT) once installed, confirming welding integrity.
- **PMI (Positive Material Identification):** Performed on all alloy and stainless steel forgings to ensure correct material grade.
Long Weld Neck Flange Products Export Countries & Cities We Manufacture & Supply From India To
Dipti Metal Industries is a proud Worldwide Long Weld Neck Flange Exporter, leading Global LWNF Supplier, Top LWNF Manufacturer, LWNF dealer, and major LWNF stockist of Long Weld Neck Flange products. We ensure timely and compliant delivery of our premium products, manufactured in our facilities, to major industrial hubs across the globe, with a strong focus on critical industrial regions worldwide, solidifying our position as a leading international manufacturing and trading partner. We are your trusted Long Weld Neck Flange Manufacturer, Supplier and Stockist In Mumbai, India, providing global projects with high performance forging solutions.
Explore Our Global Reach
- Netherlands: Rotterdam, Amsterdam, The Hague, Utrecht
- Norway: Oslo, Bergen, Stavanger, Trondheim
- United Kingdom: London, Glasgow, Aberdeen, Liverpool
- Germany: Hamburg, Bremen, Rostock, Wilhelmshaven
- Spain: Valencia, Barcelona, Bilbao, Algeciras
- France: Marseille, Le Havre, Nantes, Bordeaux
- Italy: Genoa, Trieste, Venice, Naples
- Greece: Piraeus, Thessaloniki, Patras, Heraklion
- Finland: Helsinki, Turku, Rauma, Kotka
- Poland: Gdansk, Szczecin, Gdynia, Swinoujscie
- Sweden: Stockholm, Gothenburg, Malmö, Uppsala
- Denmark: Copenhagen, Aarhus, Odense, Aalborg
- Belgium: Antwerp, Brussels, Ghent, Charleroi
- Ireland: Dublin, Cork, Limerick, Galway
- Portugal: Lisbon, Porto, Braga, Coimbra
- Austria: Vienna, Graz, Linz, Salzburg
- Switzerland: Zurich, Geneva, Basel, Bern
- Czech Republic: Prague, Brno, Ostrava, Pilsen
- Hungary: Budapest, Debrecen, Szeged, Miskolc
- Romania: Bucharest, Cluj-Napoca, Timișoara, Iași
- Bulgaria: Sofia, Plovdiv, Varna, Burgas
- Croatia: Zagreb, Split, Rijeka, Osijek
- Serbia: Belgrade, Novi Sad, Niš, Kragujevac
- Slovenia: Ljubljana, Maribor, Celje, Kranj
- Slovakia: Bratislava, Košice, Prešov, Žilina
- Lithuania: Vilnius, Kaunas, Klaipėda, Šiauliai
- Latvia: Riga, Daugavpils, Liepāja, Jelgava
- Estonia: Tallinn, Tartu, Narva, Pärnu
- Ukraine: Kyiv, Kharkiv, Odesa, Dnipro (Subject to geopolitical situation)
- Belarus: Minsk, Gomel, Mogilev, Vitebsk (Subject to geopolitical situation)
- Moldova: Chisinau, Tiraspol, Balti, Bender
- Bosnia and Herzegovina: Sarajevo, Banja Luka, Tuzla, Zenica
- Albania: Tirana, Durrës, Vlorë, Shkodër
- North Macedonia: Skopje, Bitola, Kumanovo, Prilep
- Montenegro: Podgorica, Nikšić, Herceg Novi, Pljevlja
- Kosovo: Pristina, Prizren, Ferizaj, Peć
- Cyprus: Nicosia, Limassol, Larnaca, Paphos
- Malta: Valletta, Birkirkara, Qormi, Mosta
- Iceland: Reykjavik, Kópavogur, Hafnarfjörður, Akureyri
- UAE: Dubai, Abu Dhabi, Sharjah, Jebel Ali
- Saudi Arabia: Jubail, Dammam, Jeddah, Yanbu
- Qatar: Doha, Ras Laffan, Mesaieed, Al Khor
- Kuwait: Kuwait City, Ahmadi, Mina Abdullah, Shuaiba
- Oman: Sohar, Muscat, Salalah, Duqm
- Singapore: Singapore City, Jurong Island, Tuas, Changi
- South Korea: Busan, Ulsan, Gwangyang, Incheon
- Japan: Tokyo, Osaka, Yokohama, Kobe
- China: Shanghai, Guangzhou, Tianjin, Qingdao
- Indonesia: Jakarta, Balikpapan, Surabaya, Medan
- Malaysia: Kuala Lumpur, Port Klang, Johor Bahru, Kuantan
- India: Mumbai, Chennai, Visakhapatnam, Kolkata (Local Markets - Major Industrial Demand, LWNF Flanges India, LWRF Flanges Exporter Mumbai, LWRTJ Flanges Stockist India, Long Weld Neck Flange Manufacturer Mumbai, LWNF Flange Supplier Mumbai)
- Thailand: Bangkok, Laem Chabang, Rayong, Songkhla
- Philippines: Manila, Cebu, Batangas, Davao
- Vietnam: Ho Chi Minh City, Hanoi, Da Nang, Haiphong
- Bangladesh: Dhaka, Chittagong, Khulna, Sylhet
- Pakistan: Karachi, Lahore, Faisalabad, Rawalpindi
- Sri Lanka: Colombo, Kandy, Galle, Jaffna
- Myanmar: Yangon, Mandalay, Naypyidaw, Mawlamyine
- Cambodia: Phnom Penh, Siem Reap, Battambang, Sihanoukville
- Laos: Vientiane, Luang Prabang, Savannakhet, Pakse
- Brunei: Bandar Seri Begawan, Kuala Belait, Seria, Tutong
- East Timor: Dili, Baucau, Maliana, Lospalos
- Kazakhstan: Almaty, Nur-Sultan (Astana), Shymkent, Karaganda
- Uzbekistan: Tashkent, Samarkand, Bukhara, Namangan
- Turkmenistan: Ashgabat, Turkmenabat, Dashoguz, Mary
- Kyrgyzstan: Bishkek, Osh, Karakol, Jalal-Abad
- Tajikistan: Dushanbe, Khujand, Kulob, Bokhtar
- Afghanistan: Kabul, Kandahar, Herat, Mazar-i-Sharif (Subject to geopolitical situation)
- Iran: Tehran, Mashhad, Isfahan, Shiraz (Subject to sanctions/regulations)
- Iraq: Baghdad, Basra, Mosul, Erbil (Subject to geopolitical situation)
- Turkey: Istanbul, Ankara, Izmir, Bursa
- Syria: Damascus, Aleppo, Homs, Latakia (Subject to geopolitical situation)
- Jordan: Amman, Zarqa, Irbid, Russeifa
- Lebanon: Beirut, Tripoli, Sidon, Tyre
- Israel: Jerusalem, Tel Aviv, Haifa, Rishon LeZion
- Palestine: Gaza City, Hebron, Nablus, Ramallah (Subject to geopolitical situation)
- Yemen: Sana'a, Aden, Ta'izz, Hodeidah (Subject to geopolitical situation)
- Bahrain: Manama, Riffa, Muharraq, Hamad Town
- USA: Houston, New Orleans, Los Angeles, New York City
- Canada: Halifax, Vancouver, Montreal, Calgary
- Mexico: Veracruz, Altamira, Manzanillo, Coatzacoalcos
- Greenland: Nuuk, Sisimiut, Ilulissat, Qaqortoq
- Guatemala: Guatemala City, Quetzaltenango, Escuintla, Mixco
- Belize: Belize City, Belmopan, San Ignacio, Orange Walk Town
- El Salvador: San Salvador, Soyapango, Santa Ana, San Miguel
- Honduras: Tegucigalpa, San Pedro Sula, Choloma, La Ceiba
- Nicaragua: Managua, León, Masaya, Chinandega
- Costa Rica: San José, Limón, Alajuela, Heredia
- Panama: Panama City, Colón, David, La Chorrera
- Cuba: Havana, Santiago de Cuba, Camagüey, Holguín (Subject to sanctions/regulations)
- Jamaica: Kingston, Portmore, Spanish Town, Montego Bay
- Dominican Republic: Santo Domingo, Santiago de los Caballeros, La Romana, San Pedro de Macorís
- Haiti: Port-au-Prince, Carrefour, Delmas, Gonaïves
- Puerto Rico: San Juan, Bayamón, Carolina, Ponce
- Trinidad and Tobago: Port of Spain, San Fernando, Chaguanas, Arima
- Bahamas: Nassau, Freeport, West End, Coopers Town
- Barbados: Bridgetown, Speightstown, Oistins, Holetown
- Brazil: Rio de Janeiro, Santos, Salvador, Recife
- Argentina: Buenos Aires, Rosario, La Plata, Bahía Blanca
- Chile: Valparaíso, San Antonio, Antofagasta, Iquique
- Peru: Lima, Arequipa, Trujillo, Chiclayo
- Colombia: Bogotá, Medellín, Cali, Barranquilla
- Venezuela: Caracas, Maracaibo, Valencia, Barquisimeto (Subject to geopolitical situation)
- Ecuador: Quito, Guayaquil, Cuenca, Santo Domingo de los Colorados
- Bolivia: La Paz, Santa Cruz de la Sierra, Cochabamba, Sucre
- Paraguay: Asunción, Ciudad del Este, San Lorenzo, Luque
- Uruguay: Montevideo, Salto, Paysandú, Rivera
- Guyana: Georgetown, Linden, New Amsterdam, Anna Regina
- Suriname: Paramaribo, Lelydorp, Nieuw Nickerie, Moengo
- French Guiana: Cayenne, Kourou, Matoury, Saint-Laurent-du-Maroni
- Egypt: Port Said, Alexandria, Suez, Damietta
- Nigeria: Lagos, Port Harcourt, Warri, Onne
- South Africa: Cape Town, Durban, Port Elizabeth, Richards Bay
- Algeria: Algiers, Oran, Annaba, Skikda
- Morocco: Casablanca, Rabat, Fes, Marrakech
- Tunisia: Tunis, Sfax, Sousse, Kairouan
- Libya: Tripoli, Benghazi, Misrata, Zliten (Subject to geopolitical situation)
- Sudan: Khartoum, Omdurman, Port Sudan, Kassala (Subject to geopolitical situation)
- Ethiopia: Addis Ababa, Dire Dawa, Gondar, Mekelle
- Kenya: Nairobi, Mombasa, Kisumu, Nakuru
- Tanzania: Dar es Salaam, Mwanza, Arusha, Dodoma
- Uganda: Kampala, Mbarara, Gulu, Jinja
- Ghana: Accra, Kumasi, Tamale, Sekondi-Takoradi
- Ivory Coast: Abidjan, Bouaké, Daloa, Yamoussoukro
- Cameroon: Douala, Yaoundé, Garoua, Bafoussam
- Senegal: Dakar, Touba, Thiès, Rufisque
- Angola: Luanda, Huambo, Lobito, Benguela
- Mozambique: Maputo, Matola, Nampula, Beira
- Zambia: Lusaka, Kitwe, Ndola, Livingstone
- Zimbabwe: Harare, Bulawayo, Chitungwiza, Mutare
- DR Congo: Kinshasa, Lubumbashi, Mbuji-Mayi, Kisangani
- Republic of the Congo: Brazzaville, Pointe-Noire, Dolisie, Nkayi
- Gabon: Libreville, Port-Gentil, Franceville, Oyem
- Equatorial Guinea: Malabo, Bata, Ebebiyín, Mongomo
- Mauritius: Port Louis, Beau Bassin-Rose Hill, Vacoas-Phoenix, Curepipe
- Seychelles: Victoria, Anse Boileau, Beau Vallon, Cascade
- Australia: Perth, Brisbane, Sydney, Melbourne
- New Zealand: Auckland, Wellington, Christchurch, Tauranga
- Papua New Guinea: Port Moresby, Lae, Arawa, Mount Hagen
- Fiji: Suva, Lautoka, Nadi, Labasa
- Solomon Islands: Honiara, Gizo, Auki, Kirakira
- Vanuatu: Port Vila, Luganville, Norsup, Isangel
- New Caledonia: Nouméa, Mont-Dore, Dumbéa, Païta
- French Polynesia: Papeete, Faaa, Punaauia, Pirae
Why Choose Dipti Metal Industries for Your Long Weld Neck Flange Requirements?
Dipti Metal Industries stands as a trusted global partner for high-integrity forged components. Our expertise in specialized flange types and compliance with critical standards makes us the Largest, Best, Top, and Worldwide recognized Long Weld Neck Flange (LWNF) Manufacturer, Flange importer, Flange stockist, Flange supplier, Flange exporter, Flange dealer, Flange distributor, and trader worldwide:
- **LWNF Forging Expertise:** We specialize in forging and machining Long Weld Neck Flanges with precision, ensuring the correct hub taper and length required for specialized vessel and column nozzle connections.
- **Superior Stress Analysis Design:** The LWNF is the best choice for high-integrity joints, and our manufacturing process ensures the long neck is perfectly formed to distribute stress and prevent failure under cyclic or high-pressure loads.
- **Full Material Range:** We provide LWNF in all material grades, including high-yield A694, high-temp Alloy Steel A182 F22/F91, and Nickel Alloys, suitable for any critical service.
- **Certified Quality & Traceability:** All LWNF forgings come with mandatory EN 10204 3.1 MTCs. We offer EN 10204 3.2 with Third-Party Inspection (TPI), guaranteeing dimensional accuracy and verified material composition.
- **Complete Piping Package:** We simplify procurement by supplying the required mating gaskets (RTJ Rings) and bolting (A193/A320) along with the Long Weld Neck Flanges.
What Our Customers Say About Our Long Weld Neck Flanges
"For a new reactor vessel, Dipti Metal Industries supplied ASME B16.5 Class 900# Long Weld Neck flanges, NPS 12, in Carbon Steel A105 with RF facing. The manufacturing quality, precise neck length, and stress-optimized design were exceptional. Full EN 10204 3.1/3.2 certification provided. A strong 4.97/5 manufacturer and supplier for critical vessel connections."
**Source:** US Refinery Vessel Fabricator – Pressure Vessel Design Engineer, Gulf Coast Heavy Fabrication, Houston, USA
"We ordered EN 1092-1 Type 11 Long Weld Neck flanges, DN250, PN40, in Stainless Steel 1.4404 for a distillation column in a European chemical plant. The flanges were manufactured perfectly to specification, enabling easy alignment and robust welding to the column shell. Delivery was efficient. Rating: 4.92/5."
**Source:** European Chemical Plant Design – Lead Piping Engineer, ChemPro Solutions EU, Rotterdam, Netherlands
"Dipti supplied ASME B16.5 Class 1500# Long Weld Neck flanges, NPS 8, in Alloy Steel F22 with RTJ facing for a high-temperature boiler drum nozzle in a Middle East power plant. PMI confirmed the material grade, and the RTJ groove machining was flawless for a metal-to-metal seal. Reliable and high-quality product from their manufacturing. We give them 4.88/5."
**Source:** Middle East Power Plant Contractor – Boiler Systems Specialist, Desert Energy Constructors, Abu Dhabi, UAE
"We purchased API 6A (equivalent) Long Weld Neck flanges, 5000 PSI, in Low Temp Carbon Steel A350 LF2 (NACE compliant) for a process separation vessel in Canada. The flanges showed precise dimensions for easy installation in cold weather and met severe service requirements. Communication was efficient. Rating: 4.84/5."
**Source:** Canadian Oil & Gas Producer – Pressure Systems Lead, Arctic Hydrocarbons Inc., Calgary, Canada
Get a Quote Today for Your Long Weld Neck Flange (LWNF) Requirements!
Contact Dipti Metal Industries, your expert Largest, Best, Top, Worldwide recognized Long Weld Neck Flange Manufacturer, Flange importer, Flange stockist, Flange supplier, Flange exporter, Flange dealer, Flange distributor, and trader from Mumbai, India. We are ready to discuss your specific requirements (e.g., LWRF, LWRTJ, specific material grade, custom neck length, pressure class), quantity, and necessary certifications (e.g., EN 10204 3.2 TPI, Ultrasonic Testing). Request a personalized, custom quote to secure the most effective and dependable LWNF solutions, produced in our facility or sourced from well global recognized manufacturers, that guarantee unparalleled integrity and performance for your critical process equipment. We are your one-stop solution for high-performance Long Weld Neck Flanges in Mumbai, India.
Typical dispatch: 15–45 days (project-dependent). Expedited deliveries may be available for urgent global projects.
Long Weld Neck Flange (LWNF/LWRF/LWRTJ) — Frequently Asked Questions
A Long Weld Neck Flange (LWNF) is a type of Weld Neck Flange with a much longer tapered hub (neck) that extends beyond the bolting face. It is typically used for attaching nozzles to vessels, tanks, or heat exchangers. The extended neck allows the flange to act as a nozzle itself, and its thickness can be customized to match the wall thickness of the vessel, which significantly reduces stress concentration at the junction. Dipti Metal is a Top LWNF Flange Manufacturer.
LWRF (Long Weld Neck Raised Face) and LWRTJ (Long Weld Neck Ring Type Joint) flanges are primarily used for vessel and column nozzles in high-pressure, high-temperature, or critical service environments in the Oil & Gas, Petrochemical, and Power industries. They are highly preferred for heat exchanger shell side connections and any severe cyclic application due to their superior stress distribution properties compared to standard Weld Neck Flanges.
The core difference is the length of the hub. A standard Weld Neck Flange has a hub length matching pipe thickness for butt-welding into a piping system. A Long Weld Neck Flange has an extended neck that serves as a barrel extension for directly welding onto equipment (vessel, column, or heat exchanger). The neck length is custom-designed for the required wall thickness and typically forged. Dipti Metal manufactures and stocks both standard and Long Weld Neck Flange variants.
Long Weld Neck Flanges are typically governed by ASME B16.5 for sizes up to NPS 24, and ASME B16.47 for larger sizes. They are commonly available in all pressure classes from Class 150 (PN10/PN16) up to Class 2500 (PN420). Due to their high-integrity use, the higher classes (600, 900, 1500, 2500) are frequently specified, often with an LWRTJ face for sealing against extreme pressures. Dipti Metal stocks flanges across all common ASME and API pressure ratings.
Dipti Metal Industries supplies Long Weld Neck Flanges in a wide array of materials, most commonly in Forged Carbon Steel (ASTM A105N/A350 LF2), Alloy Steel (ASTM A182 F11/F22/F91), and Stainless Steel (ASTM A182 F304/F316/F321/F347), as well as High-Nickel Alloys (Monel, Inconel, Hastelloy) for corrosion-critical applications. We provide verifiable EN 10204 3.1 or EN 10204 3.2 MTCs confirming compliance with all material and dimensional requirements.
Contact Us for Long Weld Neck Flange (LWNF) Enquiries
Reach out to Dipti Metal Industries, your Worldwide recognized Long Weld Neck Flange Manufacturer, Flange importer, Flange stockist, Flange supplier, Flange exporter, Flange dealer, Flange distributor, and trader, for all your Long Weld Neck Flange (LWNF) requirements. As a leading global provider, we are ready to assist with technical specifications, pricing, and worldwide logistics for this specialized flange type, all sourced from well global recognized manufacturers mills.
Global export packaging • Full documentation & TPI for all LWNF orders.