Flange fittings are specialized parts used to connect and connect parts of pipes or other equipment together. They provide secure and leak-proof connections while facilitating assembly, disassembly and maintenance of the system. A flange fitting consists of a pair of mating flanges, gaskets, and bolts that hold the flanges together.
Gnee strives to provide customers with as many flange specifications and sizes as possible. Whether supplying in bulk or custom flanges for a unique application, we can meet your needs. Our sales and technical support staff are trained to provide you with everything you need. Contact us now.

Gnee has a large inventory of flange fittings, which allows to meet customers’ needs and deliver products on time. This avoids delays in project progress due to shortages. Our inventory management system is highly precise, ensuring inventory accuracy and real-time updates. Whether it is mass production or individual customized needs, Gnee can provide quick responses, which brings convenience and confidence to customers.

7 days for stock goods/ within 30-50 days / depending on your order quantity

Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D.

  • Bundles
  • Wooden Boxes
  • Crates
  • Packaging for P91 pipe as customer’s requirements

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Provide Various Flange Styles

Standard And Specification Of Flange Fitting

What Are The Features Of Flange Fittings?

Flange fittings are designed to provide structural strength and stability to the piping system. The flange, along with the bolts and gasket, creates a robust and reliable connection that can withstand high pressures, vibrations, and thermal expansion/contraction.

Flange fittings come in various sizes, types, and materials, allowing them to be used in a wide range of applications. They can accommodate different pipe sizes, pressure ratings, and temperature requirements, making them versatile for diverse industrial sectors.

Flange fittings are compatible with various other components in the piping system, including valves, pumps, and equipment. They allow for easy integration and connection of different elements, facilitating the overall functionality and efficiency of the system.

Flange fittings incorporate gaskets between the flange faces to create a tight seal and prevent leakage. The gasket material, such as rubber or metal, provides excellent sealing properties, ensuring a reliable and leak-free joint.

Frequently Asked Questions

Gnee offers a large inventory of high-quality flange fittings in a variety of specifications. Get a free quote.

Flange is a connecting piece used to connect pipes, valves, pumps and other equipment in piping systems.

Connecting pipes: Flanges are used to connect two sections of pipes to form a continuous pipe system. This connection method allows the pipes to be easily removed and replaced, making maintenance and repairs easier.

Connecting Valves and Equipment: Flanges are used to connect valves, pumps, vessels and other equipment to piping systems. Through flange connections, these devices can be tightly integrated with the pipeline system to achieve fluid control and transmission.

Branch and divert connection: Flanges can be used to connect branch pipes or divert pipes to realize the branch and divert functions of the pipeline system. By using specially designed flanges, it is possible to branch from one pipe to multiple pipes or equipment, or to change the direction of fluid flow.

Supporting and Fixing: Flanges can be used to support and secure components of a piping system. They can be used in conjunction with brackets and supports to ensure that the pipe remains stable during normal operation and stress.

The three most common flange fittings used in piping systems are: Weld Neck Flange, Slip-On Flange, Blind Flange.

A flange is typically attached to a pipe using one of the following methods:

  • Welding: In the case of weld neck flanges and socket weld flanges, the flange is welded directly to the pipe. The process involves welding the neck or socket of the flange to the pipe, creating a strong and permanent connection. Welding provides excellent structural integrity and is commonly used in high-pressure and high-temperature applications.
  • Threaded Connection: For threaded flanges, the flange has internal threads that match the external threads of the pipe. The flange and pipe are screwed together, creating a secure connection. Threaded flanges are commonly used in low-pressure applications and pipes with smaller diameters.
  • Flange Bolting: This method is used for flange types such as slip-on flanges and blind flanges. The flange is placed over the pipe, and then bolts are inserted through the holes of the flange and tightened with nuts on the opposite side. The bolts create a clamping force that holds the flange and pipe together. A gasket is placed between the flange faces to create a seal and prevent leakage.
  • Oil and Gas Industry
  • Chemical Industry
  • Electric Power Industry
  • Construction
  • Water Treatment Industry
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Why Choose Gnee Flange Fittings?
Gnee provides steel pipe fittings to multiple industries, including the petrochemical industry, processing industry, etc. We have developed into a trusted global leader in the pipe fittings industry. Gnee offers ANSI, API and AWWA pipe flanges in carbon steel, stainless steel, alloy steel, and chromium steel. In addition, we offer styles including butt weld flanges, slip-on flanges, blind flanges, threaded flanges, socket weld flanges, lap flanges, orifice flanges, ring flanges, and custom flanges in sizes available from 1/2 inch to 203 inches.

In addition, our high-quality flange fitting has been successfully exported to more than 60 countries such as Vietnam, Malaysia, Indonesia, Pakistan, UAE, and South Korea, etc. Many regular customers visit our company and factory and make multiple orders.

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What Services Does Gnee Provide?

Gnee can provide the following measurement services:

1. Dimensional measurement: Measure the dimensional parameters such as length, width, and thickness by measuring instruments to ensure the product is qualified and meets the design requirements.
2. Surface measurement: Measure parameters such as flatness, unevenness, and surface roughness of the product surface to help ensure that the quality and surface state meet the requirements.
3. Thickness measurement: Use a thickness measuring instrument to accurately measure the thickness to ensure that it meets the design requirements.
4. Material measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the product to ensure that the quality and performance meet the requirements.
5. Bending and Deformation Measurements: The degree of bending and deformation is measured and monitored by using tools such as bending measuring instruments and displacement sensors to ensure that it is within the allowable range.

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Gnee can customize the size and shape for your project according to specific project needs. The custom design of the product is carried out by a professional engineer and design team. Based on the requirements and constraints of the project, they will use calculation and simulation tools, combined with experience and technical knowledge, to optimize the steel pipe design to meet the specific needs of your engineering.

● According to the strength requirements of structural design, adjust the thickness, width, and length.
● The shape can be designed according to the characteristics of the project.
● If you consider the convenience of installation and maintenance, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.

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Purchasing Gnee’s steel product can provide the following deep processing services. We can customize according to the specific needs of customers to meet the requirements.

Cutting service: Product can be custom cut to obtain the desired shape and size according to the needs of customers. For example, flame cutting, plasma cutting, laser cutting, etc., can cut steel pipes into required blocks, special-shaped parts.
Bending and forming: Products are bent and formed by stress application and appropriate processes to obtain the desired shape.
Welding service: Product can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Turning and machining of holes: Turning and machining of holes in product by using machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface treatment: In order to improve the corrosion resistance and aesthetics of the steel product, surface treatment can be carried out. This includes methods such as spraying, hot-dip galvanizing, electroplating, etc. to add a protective layer and provide corrosion resistance.

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Gnee can provide the following testing services through third-party testing agencies. These third-party testing services can provide independent, objective verification that products comply with relevant standards and regulations.

Material chemical composition analysis: Through chemical composition analysis, determine whether the composition meets the standard requirements.
Mechanical performance test: Mechanical performance test includes tensile test, impact test, bending test, etc., which are used to determine whether the mechanical properties such as strength, toughness and ductility of products meet the specified requirements.
Metallographic testing: Through metallographic testing, check the structure, grain size, non-metallic inclusions, etc. of pipes to evaluate their quality and performance.
Corrosion performance test: Through the corrosion performance test, evaluate the corrosion resistance of products, including salt spray corrosion resistance, chemical corrosion resistance, etc.
Hardness test: Hardness test is used to measure the hardness of the products, and its strength and wear resistance can be evaluated according to the hardness value.
Ultrasonic flaw detection: Ultrasonic flaw detection is used to detect internal defects of products, such as cracks, pores, inclusions, etc.

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