Flange

Understanding the Role of Flange in Industrial Applications: A Comprehensive Guide

As an important part of piping system, flanges play a vital role in connecting pipes, valves, pumps and other equipment. The products are used in oil and gas, chemical or water treatment plants and these places.

What is a Flange?

Flanges are flanges or ridges used to connect pipes, fittings or machinery. Flanges are bolted or welded to form a strong connection for easy assembly, disassembly and inspection. Flanges come in a variety of shapes and sizes to withstand different pressures, temperatures and environmental conditions. By standardizing connections, flanges promote interoperability between systems, thereby reducing downtime and maintenance costs.

Key Parameters of Flanges

Size: refers to the nominal pipe size (NPS) or diameter, which must be matched to the connected components.

Pressure Rating: indicates the maximum pressure that the flange can withstand, usually classified according to standards such as ANSI/ASME (e.g. Class 150, Class 300, Class 600).

Materials: Commonly used materials include carbon steel, stainless steel, alloy steel, and non-ferrous metals such as brass or copper, which are selected for their corrosion resistance and strength.

Face types: These include flat faces (FF), raised faces (RF) and ring joints (RTJ), which affect sealing efficiency.

Bolt hole layout: the number and diameter of bolt holes, which are critical for alignment and tightening.

Standards: Compliance with international standards such as ANSI, ASME, DIN or JIS ensures compatibility and safety.

Detailed Product Parameters Table

Parameter	Description	Common Values
Nominal Size	Diameter of the pipe connection	1/2" to 24" (or larger)
Pressure Class	Maximum pressure rating	Class 150, 300, 600, 900, 1500, 2500
Material Grade	Type of material used	A105 (Carbon Steel), SS304 (Stainless Steel), Alloy 20
Face Type	Surface design for gasket sealing	Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ)
Bolt Circle Diameter	Diameter of the bolt hole circle	Varies by size and class (e.g., 3.5" for 2" Class 150)
Standards	Governing specifications	ANSI/ASME B16.5, DIN 2527, JIS B2220

Types of Flanges

Flanges are categorized based on their design and application. Here are the most common types:

Weld Neck Flange: Features a long tapered hub for high-stress applications, ideal for high-pressure systems.
Slip-On Flange: Easy to install by sliding over the pipe and welding, suitable for low-pressure environments.
Blind Flange: Used to seal the end of a piping system, allowing for future expansion or inspection.
Socket Weld Flange: Provides smooth flow and high strength, commonly used in small-bore piping.
Threaded Flange: Screwed onto pipes without welding, ideal for non-hazardous or low-pressure systems.
Lap Joint Flange: Pairs with a stub end for easy alignment, perfect for systems requiring frequent disassembly.

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sme b16.5 flat face flange

The sme b16.5 flat face flange is manufactured by Longan factory under the ASME B16.5 standard framework. Its bionic honeycomb structure increases bending strength by 65%, and the measured DN300 burst pressure reaches 42MPa, exceeding the GB/T 1048 requirement by 280%. The gradient quenched high-carbon steel combined with the neck-embedded titanium alloy reinforcement ring provides 89J impact toughness at -70°C. The product has passed API 6A PSL 3G certification and is suitable for ultra-high pressure gas media. Longan factory supplies directly, supporting batch customization and fast delivery.

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flat raised face flange

A flange that works with both full-face and raised-face gaskets is now available. The flat raised face flange from Longan delivers exactly that. It handles DN300 burst pressures up to 42MPa (280% above GB/T 1048) and boosts bending strength by 65% through a bionic honeycomb structure. API 6A PSL 3G certified. Factory-direct pricing, free samples, and technical support provided.

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stainless steel flat flange

The stainless steel flat flange with excellent corrosion resistance is directly manufactured by Longan factory, offering much higher cost performance than European and American suppliers. The gradient quenching process combined with bionic honeycomb structure increases bending strength by 65%. The DN300 burst pressure reaches 42MPa, and it has passed API 6A PSL 3G certification. It is suitable for corrosive environments such as offshore platforms and seawater pipelines, and supports customized production.

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flat flange asme b16.5

Manufactured by Longan in China, this ASME B16.5 flat flange is available at factory rates with custom non-standard sizes. Built with gradient quenching and bionic honeycomb structure, it boosts bending strength by 65%. The DN300 variant reaches a burst pressure of 42MPa (280% higher than national standards) and holds API 6A PSL 3G certification. We accept customization per drawings and samples.

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Male Threaded Flange

Longan Male Threaded Flange China manufacturer focuses on equipment-interface connection rather than standard pipeline joining. It is designed to solve a common engineering failure point: mismatch between flanged pipeline systems and internal-threaded industrial equipment such as pumps, valves, and pressure vessels. By providing a precision-machined male thread transition structure, it enables direct integration without custom welding adapters.

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2 inch socket weld flange class 150

As a China manufacturer of 2 inch socket weld flange class 150, Longan delivers precision-engineered socket weld flanges with zero heat damage, nano-sealing, and micro-stress assembly. Factory-direct quality control from forging to testing ensures structural integrity for oil & gas, power, and petrochemical systems.

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