Characteristics and applications of thick-walled flanges in the industrial field

Basic definition and classification of thick-walled pipe flanges:

1. Special pipe flanges made by integral forging or welding process, with wall thickness significantly exceeding standard flanges by 30%-50%

2. According to the structure, it can be divided into two categories: integral forging type and multi-layer cladding type

Analysis of core performance characteristics:

1. Mechanical performance performance

• Pressure bearing capacity reaches PN160 or above, which is 2-3 pressure levels higher than ordinary flanges

• Ring stiffness is increased by 40%, which can effectively resist alternating stress

2. Material adaptability requirements

• Carbon steel material is suitable for working conditions below 480℃

• Alloy steel can withstand high temperature environment of 560℃

• Stainless steel models have corrosion resistance of CR≥17%

Typical application scenarios and technical advantages:

1. Application in extreme working conditions

• Natural gas compressor outlet pipeline (working pressure 25MPa)

• Refinery hydrogenation reactor inlet and outlet (temperature 400℃+)

2. Operation and maintenance value embodiment

• The life of the sealing surface is extended to 8-10 years (3-5 years for ordinary flanges)
• Reduce the number of maintenance shutdowns by more than 60%

Key points for selection and quality control:

1. Must comply with ASME B16.47 or GB/T 9124 standards

2. Ultrasonic flaw detection requires level II qualification

3. Post-weld heat treatment (PWHT) is required for high-temperature conditions

In key facilities such as LNG receiving stations and nuclear power main pipelines, the correct selection of thick-walled flange pipe fittings can significantly improve system reliability. Its excellent creep resistance and fatigue strength make it the preferred connection solution for high-pressure pipelines.

Read more: Pipe flange size specifications and classification or Inspection standards for pipe flanges

Article source: https://article-realm.com/article/Business/73637-Characteristics-and-applications-of-thick-walled-flanges-in-the-industrial-field.html