Carbon Stainless Steel Long Welding Neck Flange

Product Introduction

Size: 1/2 "-24" DN15-DN600

Pressure: Class 150 #, 300 #, 600 #, 900 #, 1500 #, etc.

Sealing surface: FF,RF,RTJ etc.

Material:

Carbon steel: A105,SS400, Q235B, S235JR,etc.

Stainless steel: SS304 316 321,

Standards:

ANSI B16.5 (American standard), EN 1092-1 (European standard), JIS B2220 (Japanese standard), etc.

Long welding neck flange is a common flange connection method, usually used to connect pipelines and equipment.

Main features

1. Neck length:

The neck of a long neck welded flange is longer than that of a standard neck welded flange, usually twice or more than the standard. This design provides additional spacing, which helps to reduce thermal stress and vibration transmission, making it particularly suitable for pipeline systems under high temperature and high pressure conditions.

2. Structural stability:

The design of the long neck makes the flange more stable under external forces or pressure, reducing the possibility of deformation and stress concentration in the neck. This is particularly important for some projects that require high stability of flange structures.

3. Welding platform:

Similar to standard neck welding flanges, long neck welding flanges also provide a larger welding platform for easy welding with pipelines or equipment, ensuring the firmness of the connection.

Advantages and disadvantages:

Advantages:

1. Suitable for high temperature and high pressure environments.

2. Bolted connections make installation and maintenance relatively simple.

3. It has good sealing performance and is suitable for various media.

Disadvantages:

1. Cost: The cost is high, especially in situations with high pressure and high temperature requirements.

2. The installation needs to be more precise and is not suitable for some simple low-pressure and low-temperature applications.

Application scope:

Long  welding neck flanges are widely used in industries such as petroleum, chemical, power, metallurgy, papermaking, and shipbuilding, especially in situations with high temperature and pressure requirements, such as high-temperature steam pipelines and high-pressure gas pipelines.

Overall, long neck welding flanges are a high-performance connection method, but when selecting, it is necessary to make a reasonable combination based on specific engineering requirements and conditions.