Typically, flanged tees connect to pipelines via flange plates. This connection method uses bolts to tightly secure the flange plates together, with sealing gaskets placed between them to ensure joint integrity and effectively prevent fluid leakage. During operation, fluid enters through one port and, according to system requirements, is distributed through internal passages to the other two ports, enabling functions such as diversion, convergence, or directional change.

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Types of Flanged Tees

Equal Flanged Tees: Equal flanged tees are the most common type, featuring three ports of identical diameter. They are suitable for connecting branch pipes of the same diameter. Utilizing flange connections, they offer not only convenient installation and disassembly but also reliable sealing performance. They are widely used in pipeline systems across industries such as petroleum, chemical processing, and water treatment.

Reducing Flanged Tees: Reducing flanged tees feature one or two ports with differing diameters, commonly used for connecting or transitioning between pipes of varying sizes. They enable rational connections between main and branch lines, ensuring smooth fluid distribution within piping systems. These are frequently found in petrochemical plants and process pipelines.

Lateral Flanged Tees: Lateral Flanged tees feature branch pipes angled less than 90° (e.g., 45°, 60°) relative to the main pipe. This design reduces fluid resistance in applications requiring low flow resistance, such as pipelines transporting high-viscosity media. The angled configuration minimizes impact and vortex formation at branch points, thereby reducing energy loss. It is suitable for piping systems with specific fluid dynamics requirements, such as high flow rates or conditions necessitating reduced impact.

Material & Grades of Flanged Pipe Fittings :

Carbon Steel :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Copper Alloy Steel :

 ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy :
ASTM SB564, SB160, SB472, SB162 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)

Flanged Tee Fitting Dimension

Flanged Pipe Tees Specification

Flange Types

All three ends of a flanged tee connect to piping via flanges. Common flange types, based on different design standards and application requirements, include:

Weld Neck Flange (WN)

Features a transition cone at the neck for butt welding to piping. Offers high strength and fatigue resistance, suitable for flanged tees in high-temperature, high-pressure, and critical piping systems.

Slip-On Flange (SO)

Pipes are inserted into the flange’s inner diameter for welding. Easy to install, suitable for flanged tees in medium-to-low pressure conditions.

Socket Weld Flange (SW)

Pipes are inserted into the flange’s socket for welding. Compact structure with high strength, commonly used for flanged tees in small-diameter high-pressure pipelines.

Threaded Flange (TH)

Connected via threads without welding. Suitable for flanged tees in hard-to-weld or low-pressure piping systems.

Blind Flange (BL)

Used to seal pipe ends. In certain applications, one end of a flanged tee may employ a blind flange for temporary or permanent sealing.

Lap Joint Flange (LJ)

Used with flanged pipe sections, suitable for pipelines requiring frequent disassembly or with high corrosion resistance requirements.

All Flanged Tee Advantages

1. Exceptional Sealing Performance

Thanks to meticulously designed flange connection structures and premium sealing gaskets, flanged tees maintain outstanding sealing capabilities across diverse operating conditions. Whether conveying high-pressure gases or liquids, or functioning in extreme temperatures, they effectively prevent leakage, ensuring safe and stable system operation.

2. Strong Adaptability

Flange tees offer multiple specifications and materials to suit piping systems with varying diameters, pressure ratings, and medium characteristics. Common materials include carbon steel, stainless steel, and alloy steel, each providing unique performance advantages to meet demands from general industrial applications to specialized corrosive environments.

3. Easy Installation and Maintenance

Compared to other complex pipe fittings, flanged tees feature relatively straightforward installation. Simply align them with the pipes and secure with bolts to complete the connection—no specialized skills or complex tools required. Additionally, they facilitate easy disassembly and replacement during maintenance and repairs, significantly reducing system maintenance costs and downtime.

4. Superior Mechanical Strength

Manufactured from high-strength materials, flanged tees exhibit outstanding mechanical strength and pressure resistance. They withstand both internal pipeline pressures and external environmental stresses, ensuring no deformation, rupture, or damage occurs during prolonged use. This provides a robust foundation for reliable pipeline system operation.

Stainless Steel Flanged Tee, SS 304 & 316

When selecting stainless steel flange tees, material choice is critical. 304 and 316 stainless steel have become two of the most commonly used materials in industrial applications due to their excellent corrosion resistance and mechanical strength, respectively.

304 stainless steel, valued for its favorable cost-performance ratio and broad applicability, is extensively used in food processing, chemical, and pharmaceutical industries. Conversely, 316 stainless steel excels in marine environments and medical equipment due to its superior corrosion resistance. The choice between these grades depends on the specific application scenario and requirements.

Butt weld tees involves more than simply connecting two or three pipes; it requires precise dimensional control, material compatibility, and comprehensive consideration of welding techniques. For both 304 and 316 stainless steel, temperature control during welding is critical—excessively high or low temperatures can compromise weld quality. Additionally, meticulous grinding and inspection are essential post-welding to ensure each weld point can withstand prolonged exposure to high pressure and temperature.

Carbon Steel Flanged Tee Manufacturer

ZIZI is a professional supplier of flanged tees, offering equal-diameter flanged tees, reducing flanged tees, and sloped tees in carbon steel, stainless steel, and alloy steel. Products are strictly manufactured according to international standards such as ASME, DIN, JIS, and GB, covering multiple pressure ratings and size specifications to meet application requirements in industries including petroleum, natural gas, chemical, power generation, and water treatment.

Seamless tees adhere to ASME B16.9 manufacturing standards with ASTM A234 WPB material specifications. Weld neck flanges comply with ASME B16.5 standards using ASTM A105 materials. We provide quality certification documents for flanges and tees, and apply black spray paint to finished products for rust prevention during long-distance sea transport. Products are exported in fumigation-free plywood crates.

We prioritize both product quality and precision, offering third-party inspections (including dimensional checks, material composition analysis, and pressure testing) to ensure every flange and tee meets customer specifications. Through consistent supply capabilities and rigorous quality control, we have established long-term partnerships with numerous domestic and international clients.

If you are seeking a reliable supplier of flanges and tees, please contact us. We are committed to providing high-quality products and comprehensive services.

Customized Flanges—Meeting Specialized Requirements

In many industrial sectors, standard components often fail to fully address specific needs. This is where custom flanged tees become particularly crucial. By collaborating with specialized manufacturers, tees can be tailored to actual operating conditions—customized in size, shape, or even with specialized functions.

For instance, complex chemical plants may require unique flange sealing methods or additional reinforcement measures, demanding manufacturers with extensive production expertise.

How to Select the Right Flanged Tee Manufacturer?

Determine the Operating Environment: Select appropriate materials and pressure ratings based on the fluid medium (corrosiveness, abrasiveness), temperature, and pressure within the pipeline.

Verify Dimensions: Confirm the nominal diameters of the main and branch pipes to determine whether an equal-diameter or reducer tee is required.

Follow Standards: Choose products compliant with relevant national or industry standards, such as ANSI flanged tees, according to project requirements.

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Specification of ASTM A182 Flange

Chemical Composition for ASTM A182 F304 SS Flange

Stainless Steel 304 Flange Mechanical Properties

Stainless Steel 304 Flange Physical Properties

Stainless Steel 304 Flanges Equivalent

Stainless Steel 304 Types of Flanges

Weld Neck flange

The weld neck flange has a structure with a neck and a round tube transition, which can be butt weld to the pipe to form a firm pipe connection point.

Socket weld flange

 Socket Weld Flange designed in accordance with ASME B16.5 standards, is a high-integrity flange used for creating a secure pipe connection in high-pressure systems.

Threaded flange

The threaded flange uses a screw thread to connect the flange onto pipe. A male thread is cut onto a pipe end while a female thread is cut into the bore of the flange. The male threaded pipe is then screwed into the female threaded flange.

Lap joint flange

The main structural feature of the lap joint flange is the loose connection. It consists of a flange body, a flange nipple and connecting bolts. The flange body and the flange nipple are loose fitting, and this structure allows the pipeline to expand and contract freely within a certain range.

Blind flange

Blind flanges help to terminate the ends of piping systems. The main purpose of using blind flanges is to close off the unused portion of pipe or nozzle.

Slip on flange

Slip on flange is mainly used for low-pressure fluids that have minimal risk of leakage. Stainless Steel Slip On Flange is commonly used in water lines, low-pressure compressed airlines, etc.

Class 150 Stainless Steel Flange Dimension

A182 Gr.F304 Pressure-Temperature Ratings

Advantages of Stainless Steel 304 Flanges

• Excellent Corrosion Resistance

Resistant to corrosion from water, steam, and acid-alkali solutions, suitable for a variety of mild to moderate corrosive environments.

• Good Mechanical Properties

High tensile strength and good toughness, suitable for welding and processing.

• High Temperature Oxidation Resistance

Can withstand temperatures up to 870°C, and up to 925°C for short periods.

• High cost-effectiveness

Offers superior performance at a cost significantly lower than high-nickel alloys and duplex steel flanges.

Application Areas

Chemical/petrochemical equipment

Food processing and brewing industry

Water supply and drainage systems

Pharmaceutical piping systems

Shipbuilding and marine engineering

Fire protection and HVAC systems

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Hastelloy Flanges Standard Specification

ASTM B564 UNS N06022 Hastelloy Flanges Chemical Composition

Hastelloy C22 contains approximately 56% nickel, along with chromium (20-22%), molybdenum (12-14%), tungsten (2.5-3.5%), and other elements, as well as small amounts of iron, cobalt, carbon, silicon, manganese, and other trace elements. This combination of elements gives it exceptional corrosion resistance.

Mechanical Property of Hastelloy Alloy C22 Flange

In terms of mechanical properties, Hastelloy C22 flanges offer excellent strength and toughness. At room temperature, the tensile strength can reach over 690 MPa, with a yield strength of approximately 310 MPa and an elongation rate exceeding 40%. They can withstand high operating pressures and temperatures, capable of stable operation in environments up to approximately 1093°C. Additionally, after being processed through forging, rolling, and other manufacturing processes, it achieves high dimensional accuracy and precision in seal surface machining, making it compatible with various flange connection standards (such as ANSI, DIN, JIS, etc.), ensuring the integrity and safety of pipeline systems.

Equivalent Material of C22 Hastelloy Flange

Corrosion Resistance

Hastelloy C22 alloy exhibits exceptional corrosion resistance, particularly in harsh acidic and chlorine-containing environments. It demonstrates extremely high resistance to pitting and crevice corrosion. Experimental results show that the critical pitting temperature of C-22 in a 6% FeCl₃ solution with added acid exceeds 302°F (150°C), significantly outperforming common stainless steels and certain other nickel alloys. Additionally, it exhibits outstanding corrosion resistance against organic acids and strong oxidizing acids. According to available data, C22 alloy is rated as one of the top corrosion-resistant materials, capable of withstanding pitting corrosion, crevice corrosion, stress corrosion cracking, and crevice corrosion in seawater environments. These properties make it superior to many commonly used nickel alloys in various harsh corrosive media, such as FeCl₃, CuCl₂, moist chlorine atmospheres, and seawater.

Common Types of Hastelloy C276 Flanges

Hastelloy C22 Flanges Dimension

Hastelloy C22 VS Hastelloy C276

Hastelloy C22 flanges and Hastelloy C276 flanges are both high-performance nickel-based alloys, but they differ in their chemical composition and performance in specific corrosive environments. In summary, Hastelloy C22 has a higher chromium content, making it generally more resistant to strong oxidizing media  and localized corrosion than C276, particularly in the heat-affected zone of welds. Hastelloy C276, on the other hand, contains higher levels of molybdenum and tungsten, making it more effective in highly reducing media  and under high-temperature conditions.

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

 Hastelloy C22 Flanges Exported Countries

We Export  Hastelloy C22 Flanges to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc

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What is ASME B16.5 Standard?

ASME B16.5 Standard covers pressure-temperature ratings,materials,dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are:

Flange with rating class designations 150#,300#,400#,600#,900#,and 1500#in sizes NPS % through NPS 24. Flanges with rating class designation 2500 in sizes NPS % through NPS 12.

Weld Neck Flange

What is ASME B16.5 Weld Neck Flange?

ASME B16.5 weld neck flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the weld neck flange. There are two welding neck flanges designs the first type is used with wipes while the second, longer type cannot be used with pipes but with a process plant. The flange comprises of a round fitting that extends beyond the rim of the circumference.

There are many pressure levels for ASME B16.5 weld neck flanges, and the common pressure levels include 150#, 300#, 600#, 900#, 1500#, 2500#.

Class 150 lb Weld Neck Flange Dimensions & Weight 

The material grades of ASME B16.5 weld neck flanges are divided into carbon steel, alloy steel, stainless steel, and duplex stainless steel.

Carcon Steel: ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel: ASTM A182 F5 / F9 / F11 / F12 / F22 / F91 / F92

Stainless Steel: A182 F304/304L/304H – F316/316L – F317 – F310S – F321 – F347 – F904L

Duplex Stainless Steel: A182 F51/53/55/60

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As China leading forged flanges manufacturer, Zizi offers ISO certified copper nickel flanges, stores large quantity Cu-Ni 90/10 weld neck flange, blind flange and threaded flanges.

Copper nickel is mainly composed of copper and nickel, and contains small amounts of other elements. It has beautiful yellow appearance because of the large amount of copper. The most popular copper nickel are UNS C70600 and C71500. UNS C70600 Flanges contains 90% copper and 10% nickel, so it also called Cu-Ni 90/10 flange. C71500 flange is 70/30 copper nickel flange.

We offer full type range C70600 flanges including weld neck flange, socket weld flange, threaded flange, blind flange, slip on flange, lap joint flange and spectacle blind.

Copper Nickel Grades

ASTM / ASME SB 111 UNS NO. C10100, C10200 , C10300 , C10800 , C12000, C 12200, ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10) flange , C71500 ( CU -NI- 70/30)

UNS C70600 Specification

Advantages of UNS C70600 Flange

ASTM B466 UNS C70600 Flange is stable and reliable at any temperature. It has good strength at moderate and elevate temperatures. At low temperatures, it maintains good mechanical properties, weld ability and high resistance to hydrogen. The great resistance to stress and erosion, excellent fabrication, high tensile strength, accurate dimensions make it largely used in seawater, aerospace, oil, chemical and gas industries.

Forged Flanges Manufacturer

Compared to casting flanges, forged flange have fine internal organization, better mechanical performance and ability to withstand higher pressure. The mainly manufacturing process of copper nickel flanges are as follow:

Supply Range of ASME B16.5 Flanges

Service of Steel Pipe Fittings Manufacturer

1. Delivery : Ship or courier
2. Delivery Port: Shanghai, Tianjin, Qingdao
3. Lead Time: Usually Within 15 Days.
4. Package: Anti-rust oil and plastic form for each flanges. Carton and Wooden box for copper nickel flanges within 12″, wooden pallets for larger sizes flanges.

Forged Steel Flanges Quality Control

According to customers requirement, we can offer documents and certificates including:

• CE, ISO Certificate
• Inspection Certificate to BS EN 10204-3.1 (Test Certificate)
• Row Material Certificate
• Third Party Inspection Report
• CI, PL, CO, BL, MTC

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