Flanges

Teshi Fittings is a top manufacturer of Buttweld Fittings,
Offering a diverse range of sizes up to 6800NB to meet a wide array of
industrial requirements.

Types of Flanges

Blind Flange

Expanding Flange

Lap Joint Flange

Plate Flange

Reducing Flange

Ring Joint Flange

Slip-On Flange

Socket Weld Flange

Swivel Ring Flange

Threaded Flange

Welding Neck Flange

Weldo Flange

Tongue & Groove Flange

Square Flanges

Spectacle Blind Flange

Outlet Flange

Orifice Flange

Male Female Flange

Hydraulic Sae Flange

Flat Face Flange

Anchor Flanges

Manufacturing Process and Features of Flanges

The manufacturing of flanges encompasses several crucial steps to ensure adherence to the required specifications and standards. Below is a professional overview of the typical processes involved:

Manufacturing Process:

Material Selection: Choose appropriate raw material (stainless steel, carbon steel, alloy steel, duplex stainless steel, super duplex stainless steel, or copper nickel).
Cutting: Cut raw material to required sizes using plasma cutting, water jet cutting, or band saw cutting.
Forging: Heat and shape cut pieces into desired form using forging presses or hammers for increased strength and durability.
Heat Treatment: Enhance mechanical properties through annealing, normalizing, or quenching and tempering.
Machining: Machine heat-treated flanges to precise dimensions, including bolt holes and facing, using lathes, milling machines, or CNC machines.
Drilling: Drill bolt holes as per specified pattern for proper alignment and fit.
Surface Finishing: Improve appearance and corrosion resistance through sandblasting, polishing, or coating.
Inspection and Testing: Ensure flanges meet industry standards via dimensional inspection, pressure testing, and non-destructive testing (NDT) like ultrasonic or radiographic testing.
Marking and Documentation: Mark flanges with relevant information and prepare documentation including test reports and material certificates.
Packaging and Shipping: Carefully package flanges to prevent damage during transit and ship to customers.

Features of Flanges:

Variety of Types: Includes weld neck, slip-on, socket weld, lap joint, threaded, blind, and ring type joint (RTJ) flanges for specific applications and connection methods.
Material Versatility: Made from stainless steel, carbon steel, alloy steel, duplex stainless steel, super duplex stainless steel, and copper nickel for different applications.
High Strength and Durability: Forging and heat treatment enhance mechanical properties for high pressure and temperature conditions.
Leak-Proof Connections: Proper installation with gaskets and bolting ensures leak-proof connections.
Ease of Installation and Maintenance: Allows easy assembly, disassembly, inspection, and modifications.
Customization: Can be manufactured to custom specifications for unique industry requirements.
Compliance with Standards: Meets international standards such as ASME, ANSI, ISO, and MSS for compatibility and reliability.
Corrosion Resistance: Surface finishing and material selection provide resistance to corrosion for longer service life.

Frequently Asked Questions

Most frequent questions and answers

Flanges are components used to connect pipes, valves, pumps, and other equipment in a piping system. They provide easy access for cleaning, inspection, or modification. Flanges are typically joined to each other by bolting and are joined to the piping system by welding or threading.

Flanges come in a wide range of sizes to match different pipe diameters. Standard sizes typically range from 1/2 inch to 24 inches or larger, depending on the application and industry standards.

Flanges are manufactured according to various industry standards, such as ASME B16.5, ASME B16.47, EN 1092-1, and others. These standards specify the dimensions, tolerances, materials, pressure ratings, and other critical aspects to ensure quality and compatibility.

Flanges are widely used in various industries, including oil and gas, petrochemical, power generation, water and wastewater treatment, and HVAC systems, where they provide reliable and maintainable connections.

Yes, many types of flanges, particularly weld neck and socket weld flanges, are designed for high-pressure applications. The choice of flange type and material should match the pressure and temperature requirements of the system.

Flanges are made from various materials, including carbon steel, stainless steel, alloy steel, and plastic, depending on the application’s requirements, such as the type of fluid, pressure, and temperature conditions.

There are several types of flanges, including:

Weld Neck Flange: Designed to be welded to the pipe for high-stress applications.
Slip-On Flange: Slips over the pipe and is welded in place; used for low-pressure applications.
Blind Flange: Used to close the end of a piping system or vessel opening.
Socket Weld Flange: Similar to a slip-on flange but with a socket to fit the pipe; used for small, high-pressure pipes.
Lap Joint Flange: Used with a stub end for systems requiring frequent disassembly.
Threaded Flange: Screws onto the pipe; used for low-pressure applications where welding is not possible.
Orifice Flange: Used with orifice meters for measuring the flow rate of fluids.

A raised face flange has a small raised area around the bore where the gasket is placed, which helps to concentrate the pressure on a smaller gasket area and enhance the seal. A flat face flange has a flat sealing surface and is typically used when the mating flange or the flange on the connected equipment is also flat faced to avoid bending moments.

Common applications include:

Connecting pipes and valves in a piping system.
Providing easy access points for maintenance, inspection, and modification.
Terminating the end of a piping system with blind flanges.
Measuring flow rates with orifice flanges.

Yes, we offer custom manufacturing solutions for flanges to meet specific requirements. Please contact us with your specifications, and we will work with you to create the flanges you need.