How to Choose The Right Welding flange for Specific Application?

What is Welded flange?

Welded flange is a commonly used flange form in pipeline connections, which can work under high pressure and temperature conditions. The structure of a welded flange consists of a flange body and a welding neck, which is connected together by bolts using a joint welded to the pipeline. The main characteristics of welded flanges are good sealing performance, high temperature resistance, and low leakage. They have been widely used in fields such as petrochemical, shipbuilding, aerospace, and have become many industry standards.

Features of Welded flange

Good sealing performance

The structure of welded flanges is particularly suitable for situations with high pressure and sealing requirements, and its sealing performance is superior to ordinary flanges. Compared with traditional gaskets, welded flanges have more reliable sealing performance and are less prone to leakage and failure.

High temperature performance

Welding flanges are made of high-temperature materials and have strong high-temperature resistance. In high-temperature and high-pressure environments, the performance of welded flanges is stable and not prone to cracking.

Durable and sturdy

The body and welding neck of the welding flange are made of high-strength materials, which have good corrosion resistance and thermal stability and can be used for a long time.

The Price of Welded flanges

The price of welded flanges is affected by various factors such as material, specification, type, pressure level, brand, market supply and demand, etc., and the following are some common prices of welded flanges:

Carbon steel welded flange:

Ordinary carbon steel flat welded flange, DN15 - DN600 specifications, the price may range from a few yuan to dozens of yuan. For example, the carbon steel flat welded flange of Hebei Yuedi Pipeline Engineering Co., Ltd., DN15 - DN600 specification, is quoted at 25 yuan / piece.

The price of large-diameter carbon steel butt welding flanges will be relatively high, such as Boyang carbon steel large-diameter butt welding flanges, the price can reach 88 yuan.

Stainless steel welded flange:

304 stainless steel flat welded flange, small specifications may be more than ten yuan a piece, large diameter or special specifications will be higher. For example, Zhejiang Yuhao Stainless Steel's 304 stainless steel flat welded flange PN10 national standard, dn50 - 80 specifications, 6.8 yuan / piece.

The price of 316L stainless steel butt welded flange with neck is generally higher than that of 304 stainless steel, such as Xinyong brand 316 stainless steel forged flange, DN150, PN2.0, the price is 850 yuan.

Alloy steel welded flange: Some special alloy steel welded flanges, such as 15CrMo alloy butt welded flange with neck, DN80, PN63, the price supplied by Runhong is 950 yuan.

The above prices are for reference only, and the actual price may vary due to market fluctuations, purchase quantities and other factors. When purchasing welded flanges, it is advisable to consult several suppliers for comprehensive comparison and evaluation.

How to Choose The Right Welding flange for Specific Application?

Choosing a welding flange suitable for a specific application scenario requires comprehensive consideration of many factors, which are detailed below:

1. Consider pressure vs. temperature

Pressure level: select the welding flange of the corresponding pressure level according to the working pressure of the piping system. When the pressure is high, the butt welding flange is a good choice, because it has a long neck, and the wall thickness of the butt of the pipe gradually transitions, which can form a high-quality butt weld, with good strength and sealing, and is suitable for high-pressure environments; In the case of low pressure, flat welded flange is sufficient, it has a simple structure, low cost, and although the strength of the weld is relatively low, it can meet the needs of low pressure.

Temperature range: Different temperature environments have different effects on the performance of flange materials. In a high-temperature environment, it is necessary to choose a flange made of materials with good high temperature resistance, such as the butt welding flange made of chromium-molybdenum alloy steel is often used in high-temperature pipelines; In low-temperature environments, flanges need to have good low-temperature toughness, such as welded flanges made of nickel-alloyed steel can be used for low-temperature conditions.

2. Depending on the characteristics of the medium

Corrosiveness: If the pipeline is transporting corrosive media, such as sulfuric acid, hydrochloric acid, etc., it is necessary to choose a welding flange made of corrosion-resistant materials, such as flat welding or butt welding flange made of stainless steel. For some less corrosive media, carbon steel flanges with anti-corrosion treatment can also be selected.

Toxicity and flammability and explosiveness: When the medium is toxic or flammable and explosive, the sealing performance and reliability of the flange are extremely high. At this time, the butt welding flange with good sealing performance should be preferred, and the high-quality sealing gasket should be matched to ensure the safety of the system.

3. Combine the size of the pipe

Pipe diameter size: when the pipe diameter is small, the socket welding flange is more applicable, it has socket hole, the pipe is welded after insertion, easy to install, and suitable for small-diameter pipes; For larger pipe diameters, butt welded flanges or flat welded flanges are more commonly used, which can be further selected according to specific pressure and usage requirements.

4. Consider installation and maintenance

Installation space: If the installation space is limited, a compact welding flange should be selected, such as socket welding flange. If space is sufficient, various types of flanges can be selected based on other factors.

Maintenance requirements: For pipeline systems that require frequent maintenance and overhaul, the type of flange that is easy to disassemble and install should be selected.

5. Focus on the cost factor

Material cost: The price of welding flanges of different materials varies greatly. The cost of carbon steel flanges is relatively low, which is suitable for general industrial occasions; Stainless steel flanges and alloy steel flanges are more expensive and are usually used in special occasions that require high performance such as corrosion resistance and high temperature resistance.

Machining and installation costs: The processing cost of flanges with complex processing technology will increase accordingly. For example, the processing requirements of butt welding flanges are high and the cost is relatively high; The flat weld flange is simple to process and the cost is lower. At the same time, the labor cost and welding material cost in the installation process also need to be taken into account.

Supplier of Welded flange

LTZC provides Welded flange. If you are looking for a supplier of Welded flange please contact us for the latest quotation.