Leading Flange Manufacturer & Exporter
to Vietnam
Werner Flanges is Vietnam's trusted industrial flange supplier, delivering premium-quality forged flanges to the country's rapidly expanding oil and gas, shipbuilding, power generation, chemical processing, and infrastructure sectors. As Vietnam accelerates industrial development under its Socio-Economic Development Strategy 2021–2030, the demand for high-specification piping components has never been greater. Werner Flanges supports this growth by supplying ASME B16.5, ASME B16.47, and MSS SP-44 compliant flanges to key industrial hubs including Ho Chi Minh City, Hanoi, Hai Phong, Da Nang, Vung Tau, and the Mekong Delta industrial zones.
Our product range covers carbon steel (ASTM A105), stainless steel (ASTM A182 F304/316), alloy steel (ASTM A182 F11/F22), and duplex stainless steel flanges, available in pressure classes from 150# to 2500# and sizes from ½” to 60″ NPS. Every flange manufactured at Werner Flanges undergoes rigorous dimensional inspection, mechanical property testing, non-destructive examination, and third-party certification, meeting the requirements of Vietnam’s national standards (TCVN), international codes (ASME, API, EN), and the specifications of major Vietnamese state-owned enterprises including PetroVietnam (PVN), Electricity of Vietnam (EVN), and Vietnam National Coal-Mineral Industries Group (Vinacomin).
As a direct manufacturer, Werner Flanges eliminates distributor markups, offering Vietnamese buyers 15–25% cost savings compared to trading company pricing — without any compromise on quality. Our established logistics network enables sea freight delivery to Cat Lai Port and Hai Phong Port within 18–22 days, with air freight options available for urgent requirements in 5–7 days. We provide full documentation packages in English with Vietnamese translations available on request, including Material Test Certificates (EN 10204 3.1), dimensional reports, PMI results, and third-party inspection certificates accepted by Vietnam’s Ministry of Industry and Trade (MOIT) and major project owners.
Whether you are sourcing flanges for PetroVietnam's offshore platforms in the South China Sea, EVN's gas-fired power plants in the Mekong Delta, shipyards in Hai Phong, or chemical processing facilities in the Phu My industrial zone, Werner Flanges brings the manufacturing quality, technical expertise, and delivery reliability that Vietnam's industries demand.
Specifications
| Specification | Details |
|---|---|
| Pressure Rating | Class 150 to Class 2500 |
| Flange Type | Plate Flange |
| Facing Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range | ½” to 24” (DN 15 to DN 600) |
| Temperature Range | -29°C to +593°C (Depending on Material & Pressure Class) |
| Applications | Oil & Gas, Petrochemical, Power Generation, Water Treatment, Marine & Industrial Sectors |
| Manufacturing Process | Forged / Machined |
| Certification | EN 10204 3.1 / 3.2, IBR, NACE MR0175 / ISO 15156 (as applicable) |
Matel and Grade
| Type of Materials | Common Specifications / Customization Available on Request |
|---|---|
| Duplex Steel | ASTM/ASME A182 F51, F60, F61, UNS S31803, UNS S32205 |
| Super Duplex Steel | ASTM/ASME A182 F53, F55, UNS S32750, UNS S32760, F44 (6Mo) |
| Stainless Steel | ASTM/ASME A182 F304, F304L, F316, F316L, F310, F317L, F321, F347 |
| Carbon Steel | ASTM A105, A350 LF1, LF2, LF3, A266 Class 1/2, A694 F42 to F70, A765 Gr. II |
| Alloy Steel | ASTM/ASME A182 F1, F5, F9, F11, F12, F22 |
| Non-Ferrous Alloys | Titanium, Brass, Admiralty Brass, Copper Nickel, Nickel Alloys, Hastelloy |
| Titanium | ASTM/ASME B381 Gr.1, Gr.2, Gr.5, Gr.7, Gr.12, Gr.16 |
| Copper Nickel | ASTM B151 UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30) |
| Brass, Al-Brass | ASTM B152 UNS C26000, C27200, C28000; ASTM B111 for Al-Brass |
| Nickel Alloys | ASTM B160, B161, B564 – UNS N02200, N02201, N04400, N08800, N08825, N06600, N06601, N06625, Monel K500 |
| Alloy 20 | ASTM B462 UNS N08020 |
| Hastelloy | ASTM B564 UNS N10276 (Hastelloy C276), N06022 (Hastelloy C22) |
| Cladded Materials | ASTM B898, B265, B424 or custom explosion/clad bonding using dissimilar metals |
| Titanium-Steel, Nickel-Steel, Titanium-Copper, Stainless Steel-Carbon Steel, Bimetallic/Trimetallic Combinations |
Types of Flanges
| Weld Neck Flanges Supplier | Raised Face Weld Neck Flanges | Flat Face Weld Neck Flanges | RTJ Weld Neck Flanges | Long Weld Neck Flanges |
| High Pressure Weld Neck Flanges | Forged Weld Neck Flanges | Reducing Weld Neck Flanges | Industrial Weld Neck Flanges | Custom Weld Neck Flanges |
Industries and Applications We Supply
| Industry | Applications in Vietnam |
|---|---|
Oil & Gas Industry |
Vietnam’s offshore oil and gas production in the South China Sea drives continuous demand for weld neck flanges across upstream and midstream infrastructure. Platforms and subsea systems require high-integrity flange connections for safe operation in corrosive marine environments.
Upstream Applications: Weld neck flanges are used in wellhead christmas trees, production manifolds, separators, flowlines, and high-pressure injection piping. RTJ facing and NACE MR0175 compliant materials ensure reliable performance for sour gas and high-pressure conditions. Midstream Gas Transmission: Vietnam’s offshore-to-onshore gas pipelines employ weld neck flanges at subsea tie-ins, compressor stations, pig launchers and receivers, pressure regulation stations, and onshore processing terminals supplying power and industrial sectors. LNG Infrastructure: LNG receiving terminals and regasification plants use cryogenic weld neck flanges for unloading arms, storage tank connections, vaporization lines, and send-out pipelines. Low-temperature steels such as ASTM A350 LF2 and stainless steel grades are common. |
Power Generation |
Vietnam’s combined cycle gas-fired power plants and thermal power stations rely on weld neck flanges for high-pressure, high-temperature piping systems to ensure continuous electricity supply.
Gas-Fired Power Plants: Applications include fuel gas supply piping, HRSG systems, boiler drum connections, turbine bypass lines, condensate piping, and superheater/reheater circuits using alloy steel grades such as F22 and F91. Renewable & Biomass Facilities: Biogas, biomass, and waste-to-energy plants utilize stainless steel weld neck flanges in corrosive feedstock handling, steam systems, and utility piping networks, supporting Vietnam’s growing renewable energy sector. |
Petrochemical & Refining |
Vietnam’s petrochemical complexes and refineries require corrosion-resistant weld neck flanges to handle continuous processing operations and high-pressure systems.
Petrochemical Processing: Weld neck flanges are used in ethylene cracker piping, aromatics units, chemical feed systems, refrigeration lines, and high-pressure steam headers using stainless and alloy steels. Refinery Applications: Refineries deploy weld neck flanges in crude distillation units, hydroprocessing units, cooling water circuits, and utility systems where leak-tight, thermal-stable connections are critical. Specialty Chemical Production: Advanced chemical plants increasingly use duplex, super duplex, and high-alloy weld neck flanges to handle highly corrosive environments within industrial zones across Vietnam. |
Water & Industrial Utilities |
Urban infrastructure, industrial parks, and manufacturing hubs in Vietnam depend on robust water and utility piping systems with reliable weld neck flange connections.
Water Treatment & Desalination: Stainless steel weld neck flanges are used in seawater intake lines, reverse osmosis systems, cooling circuits, and brine discharge pipelines operating under corrosive conditions. Industrial Utility Systems: Applications include compressed air networks, cooling systems, process water piping, and plant utility lines supporting electronics, automotive, and chemical manufacturing facilities. |
Frequently Asked Questions (FAQs)
- q1: do your flanges comply with petro vietnam (pvn) technical specifications?
- yes. werner flanges manufactures flanges meeting pvn’s material and quality requirements, including astm a105 nace mr0175-compliant carbon steel for sour service, api 6a for wellhead applications, and asme b16.5 for process piping. all flanges come with en 10204 3.1 material test certificates, pmi reports, hardness certification (≤200 hb for sour service), and optional third-party inspection by dnv, bureau veritas, or lloyd’s register. documentation packages follow pvn material requisition requirements to streamline technical approval.
- q2: can you supply flanges for lng terminal projects in vietnam?
- yes. we supply cryogenic-service flanges for lng applications including astm a350 lf2 (to −46°c) for ambient-to-cold service and astm a182 f304l/f316l stainless steel for cryogenic piping at −162°c. charpy v-notch impact testing is performed at specified temperatures and documented on en 10204 3.2 certificates, with optional third-party inspection. our flanges comply with lng design codes such as en 1473, nfpa 59a, and vietnamese energy infrastructure standards.
- q3: what is the minimum order quantity (moq) for flanges to vietnam?
- we do not impose a strict moq. flanges can be supplied from single pieces for urgent maintenance to large quantities for greenfield projects. for recurring purchasers, blanket purchase order arrangements with scheduled releases are possible to optimize freight efficiency and ensure stock availability.
- q4: can you provide asean form d certificates for preferential import duties?
- yes, where manufacturing origin qualifies under asean free trade area (afta) rules of origin, werner flanges can provide form d certificates enabling preferential cept tariff rates. buyers should confirm hs codes and duty applicability with their vietnamese customs broker before ordering.
- q5: do you offer technical support for flange specification in vietnamese projects?
- our engineering team provides pre-sale technical consultation including material grade selection, pressure class determination per asme b16.5, flange type recommendations, and gasket selection guidance. post-delivery support includes installation guidance, welding compatibility, and troubleshooting field issues.
- q6: how do you handle vietnamese customs clearance and import documentation?
- we prepare export documentation aligned with vietnam customs requirements, including hs codes, declared customs values, packing lists, and certificates of origin. we coordinate with freight forwarders specializing in vietnam trade for clearance at cat lai (hcmc) or hai phong ports. for projects requiring ministry of industry and trade import licenses, we provide supporting technical documentation.
