Slip-On Flanges Supplier to Thailand

Leading Manufacturer & Exporter of
Slip-On Flanges to Thailand

Werner Flanges is a trusted slip-on flange manufacturer and exporter serving the Thai petrochemical, oil & gas, power generation, and industrial sectors. With decades of global flange manufacturing expertise and ISO 9001:2015 certification, we deliver precision-engineered slip-on flanges that meet ASME B16.5, ASTM, and international standards. Our direct manufacturing capability ensures competitive pricing, fast delivery to Bangkok, Rayong, and other Thai industrial hubs, and complete customization for your specific application requirements. Whether you need carbon steel, stainless steel, alloy steel, or duplex slip-on flanges, we maintain comprehensive inventory and manufacturing capacity to support Thailand's growing energy, chemical processing, and infrastructure sectors. From 1/2" to 60" diameters and pressure classes 150# through 2500#, our slip-on flanges are engineered for reliability and built to last.

ANSI-B16-5-Class-2500-Slipon-flanges-sl1

ANSI-B16-50-Class-900-slip-on-flanges-sl3

At Werner Flanges, quality and compliance are our top priorities. Each slip-on flange undergoes rigorous inspection and testing, including dimensional checks, material certification verification, and hydrostatic pressure testing, ensuring flawless performance in demanding Thai industrial environments. Our team works closely with engineers, contractors, and procurement specialists to provide expert guidance on flange selection, material suitability, and pressure class requirements, guaranteeing the right solution for every application.

We also offer tailor-made solutions for specialized projects, including high-temperature, corrosion-resistant, and heavy-duty slip-on flanges. Our modern manufacturing facilities and advanced machining capabilities allow us to produce custom flange designs efficiently, while adhering to international standards and client specifications. Whether for petrochemical plants in Rayong or power generation facilities in Bangkok, Werner Flanges delivers durable, high-performance slip-on flanges that optimize operational efficiency and minimize maintenance costs.

Our commitment to fast delivery and local support makes Werner Flanges a preferred partner for Thailand’s energy and industrial sectors. With strategically located warehouses and distribution networks in Bangkok, Rayong, and Laem Chabang, we ensure timely supply of slip-on flanges to meet urgent project deadlines. Combined with our technical support and after-sales service, we help clients minimize downtime, reduce inventory costs, and maintain uninterrupted operations across oil & gas, petrochemical, power generation, and infrastructure projects.

Thailand Slip-On Flanges | Bangkok, Rayong & Laem Chabang Supply | Fast Delivery & Local Support | Oil & Gas, Power & Infrastructure Projects

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
Cladded Materials	Titanium-Steel, Nickel-Steel, Titanium-Copper, Stainless Steel-Carbon Steel, Bimetallic/Trimetallic Combinations

Types of Flanges

Slip On Flanges	Raised Face Slip On Flanges	Flat Face Slip On Flanges	RTJ Slip On Flanges	Forged Slip On Flanges
Plate Slip On Flanges	Industrial Slip On Flanges	High Pressure Slip On Flanges	ASME B16.5 Slip On Flanges	ANSI Slip On Flanges

Industries and Applications We Supply

Industry	Applications
Oil & Gas Industry	Thailand’s oil and gas operations span upstream exploration and production, midstream transportation and processing, and downstream refining and distribution. Slip-on flanges serve critical roles throughout this value chain. Upstream Operations: Onshore petroleum exploration and production facilities in Thailand employ slip-on flanges on produced water handling systems, crude oil processing, and natural gas compression. Wellhead equipment, separation vessels, and initial treatment facilities use slip-on flanges for non-critical connections where ease of assembly is valued over maximum strength. Most upstream applications use carbon steel A105 at 150-300# pressure ratings, though subsurface corrosion can necessitate duplex or super-duplex materials. Midstream Transportation and Processing: Natural gas from upstream operations flows through transmission pipelines to processing facilities. Slip-on flanges connect pipeline sections, diverter assemblies, and compression equipment. The low pressure of transmission pipelines (typically 400-800 psi) allows use of carbon steel 300-600# flanges. However, high-reliability service on critical connections sometimes specifies alloy steel or stainless materials for enhanced reliability. The strategic nature of midstream infrastructure demands materials and workmanship exceeding typical industrial standards. Downstream Refining: Thailand’s oil refineries in Rayong, Khanh Hoa (Vietnam), and other locations employ slip-on flanges extensively in crude distillation units, reformers, hydrocrackers, and auxiliary systems. Refinery slip-on flanges must withstand hydrogen service in hydrotreating units (requiring NACE MR0175 certification), caustic alkali service in treating units, and corrosive sour-crude processing. The elevated temperatures and pressures of refinery service demand carbon steel for general service, stainless steel for corrosive environments, and alloy steel for hydrogen service. The diverse service environments in refining mean a single refinery may require carbon steel, stainless steel, alloy steel, and duplex flanges simultaneously to serve different process units optimally. Offshore Operations: Thailand’s offshore oil and gas platforms in the Gulf of Thailand employ slip-on flanges on subsea piping, platform piping, and equipment connections. Seawater exposure mandates stainless steel (316) or duplex materials (F51/F53) to prevent catastrophic corrosion. The high-pressure service of subsea equipment and high-reliability requirements of offshore operations drive specification of premium materials and third-party inspection.
Power Generation	Thailand operates diverse power generation facilities including coal-fired plants, natural gas combined-cycle units, hydroelectric stations, and increasingly renewable energy sources. Slip-on flanges serve critical roles in steam systems, cooling systems, and auxiliary equipment.Fossil-Fuel Power Plants:Steam generation in coal-fired and natural gas plants requires flanges rated for steam pressures of 1500-3000 psi and temperatures up to 1050°F. Alloy steel F22 flanges are standard for main and auxiliary steam lines, providing the creep resistance necessary for long-term reliability. Cooling water systems employ lower-pressure flanges (150-300#) in carbon steel or stainless steel depending on makeup water quality. Blowdown and auxiliary systems may use carbon steel throughout.Combined Cycle and Advanced Plants:Modern combined-cycle plants and advanced supercritical steam generators employ F91 super-alloy flanges on supercritical steam lines, achieving maximum thermal efficiency and minimum emissions. The material investment in F91 is justified by superior efficiency reducing fuel consumption per megawatt-hour.Hydroelectric Facilities: Water storage and distribution systems in hydroelectric plants employ various flange materials depending on water chemistry and pressure. High-pressure penstock systems may use alloy steel flanges, while water intake and auxiliary systems use carbon steel or stainless materials
Petrochemical Processing	Thailand’s petrochemical complexes in Map Ta Phut, Rayong, and Bangkok represent some of Southeast Asia’s largest chemical production facilities. Slip-on flanges are integral to distillation columns, reactors, heat exchangers, and process piping throughout these complexes.Distillation and Separation:Crude oil distillation units, product separation towers, and fractionation columns employ slip-on flanges on product withdraw, feed inlet, and reboiler connections. These flanges typically experience moderate pressure (150-600# depending on unit), elevated temperature (200-400°F), and non-corrosive service, making carbon steel ASTM A105 the standard choice. The high volume of flanges in a large distillation unit (sometimes hundreds of flange connections) drives economies with carbon steel over more exotic materials.Reactors and Catalytic Converters:Fixed-bed reactors, fluid catalytic cracking units, and other reactor vessels employ slip-on flanges on feed, product, and recycle connections. These flanges typically see high pressure (600-1500# in some catalytic crackers) and may see mildly corrosive environments from hydrogen sulfide or other reactive components. Carbon steel with protective coatings is common for general service, while stainless steel is specified where corrosion risk is significant.Specialty Chemical Production: Polymers, specialty chemicals, and fine chemicals production frequently employs slip-on flanges on high-pressure reactors, specialized reactors, and auxiliary systems. Corrosive intermediate products or reactive feedstock may necessitate stainless steel or alloy materials to prevent equipment degradation. Pressure ratings can vary widely depending on specific process conditions. . Applications in Thai petrochemical complexes: Reactor vessel connections, distillation column feed/product lines, heat exchanger inlet/outlet, vapor recovery systems, condensate return piping, nitrogen purge systems, quench oil circulation.
Water & Wastewater Treatment	Thailand’s municipal and industrial water treatment plants employ slip-on flanges on treated water distribution, wastewater collection, and specialized treatment systems.Treated Water Distribution:Clean potable water systems typically employ stainless steel 304/304L slip-on flanges to prevent corrosion and rust contamination. The light staining from mineral water and slightly aggressive pH of soft water can corrode carbon steel pipes and flanges, so stainless steel is the standard choice in municipal water supplies.Wastewater Collection and Treatment:Municipal wastewater systems often employ carbon steel flanges where the internally corrosive nature of wastewater is managed through protective coatings or cathodic protection. Some advanced facilities employ stainless steel for improved reliability and reduced maintenance.Desalination Plants: Thailand’s coastal desalination facilities (increasingly important given Thailand’s water security needs) employ duplex and super-duplex stainless steel flanges on high-pressure saltwater piping, providing absolute assurance against corrosion. The seawater-exposed equipment in these plants experiences the most aggressive corrosion environment, mandating premium materials. Industrial Manufacturing General manufacturing facilities throughout Bangkok, Chonburi, and Rayong employ slip-on flanges on cooling water, compressed air, and utility piping. Cooling Systems: Central cooling water facilities serving multiple factories and offices in industrial parks employ slip-on flanges in carbon steel (internally protected) or stainless steel (for low-maintenance operation). Large cooling towers and distribution systems can have hundreds of flange connections. Compressed Air Systems: Compressed air generation and distribution throughout manufacturing facilities employ slip-on flanges on air main lines, branch lines, and unit connections. Dry compressed air can use carbon steel, while oil-contaminated air in humid Thailand requires stainless steel to prevent rust and corrosion. Specialty Applications: Manufacturing-specific applications—rubber production, food processing, textile manufacturing, electronics manufacturing—employ flanges optimized to their specific service requirements. Understanding the customer’s industry and application is essential to recommending the optimal flange material and design.

Frequently Asked Questions (FAQs)

Q: What’s the difference between slip-on flanges and weld-neck flanges?: slip-on flanges have a bore larger than the pipe diameter, allowing the pipe to slide through. weld-neck flanges have a bore matching the pipe’s internal diameter with a conical neck that aligns with the pipe end. slip-on flanges are easier to install and lower cost; weld-neck flanges are stronger and better for high-pressure service. general industrial applications often use slip-on; critical high-pressure service specifies weld-neck.
Q: Which material should i specify for coastal thai facilities exposed to salt spray?: stainless steel (304 or 316) or duplex stainless steel are recommended for saltwater-exposed equipment. 316 provides superior pitting resistance vs 304. duplex materials (f51, f53, f55) offer even greater corrosion resistance if budget allows. carbon steel will corrode rapidly without coatings, making stainless essential for low-maintenance coastal service.
Q: What delivery time should i expect from werner flanges to my facility in rayong?: standard sea freight to rayong port takes 18-25 days. inland transport adds 1-3 days. total delivery is usually 20-28 days from order. expedited air freight to bangkok (4-7 days) plus trucking to rayong (1-2 days) totals 6-9 days for urgent needs.
Q: Are your flanges acceptable for NACE MR0175 hydrogen service?: yes, alloy steel flanges (f11, f22, f91) are certified per nace mr0175 for hydrogen service. carbon steel and stainless steel flanges are not nace-certified and cannot be used in hydrogen environments. specify nace-certified alloy steel for petrochemical hydroprocessing hydrogen service.
Q: Can you manufacture custom flange sizes not in the ASME B16.5 standard?: yes, non-standard custom flanges can be manufactured to customer specifications. custom flanges require detailed engineering drawings, longer lead times (30-45 days), and minimum order quantities based on complexity. contact us with your requirements for evaluation and quotation.
Q: What’s the difference between raised face (RF), flat face (FF), and ring type joint (RTJ) flanges?: raised face (rf) has a raised section concentrating gasket pressure and is most common. flat face (ff) is completely flat, used for low-pressure applications with soft gaskets. ring type joint (rtj) has a groove for a metal ring gasket in high-pressure/high-temperature service. most thai industrial applications use rf; offshore and critical service use rtj.
Q: Can I mix materials in a single order (e.g., some carbon steel, some stainless, some alloy steel)?: yes, mixed-material orders are supported. flanges are tailored to each application’s requirements. mixed orders are common in petrochemical plants where different streams require different materials. specify materials for each size in your purchase order.