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Loose flange
Loose flange is a common connection component in pipeline systems, usually used to connect two pipes or equipment, but unlike traditional fastening flanges, the design of loose flanges allows a certain amount of free space between the flange and the pipe or equipment, making it more flexible during assembly and disassembly. Loose flanges are widely used in pipeline systems that need to be easy to disassemble, clean or overhaul. (Customized processing is supported)
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1. Definition of Loose Flange
A loose flange is a flange that is not directly welded to the pipe, but connected to the end of the pipe through an external collar. This flange design makes it not completely tightly connected to the pipe, allowing a certain amount of free movement after the pipe is installed.
2. Structure of Loose Flange
A loose flange consists of two main parts:
Outer Flange: This is the part that connects the pipe and other equipment, usually with external threads or holes to match the pipe or other flanges.
Inner Ring: The inner ring is a ring-shaped part that can rotate or slide freely, through which the loose flange is connected to the end of the pipe.
The design structure of the loose flange generally includes:
Flange: Usually has a standard flange hole for bolt connection.
Sealing surface: The sealing surface in contact with the pipe to ensure the sealing of the flange connection.
Ring: The inner ring part can be loosened or moved as needed.
3. Technical parameters
| Material | Carbon steel, stainless steel, alloy steel, plastic, fluorine-lined materials, etc. |
| Specification range | DN15 (1/2") to DN2000 (80") and other customized sizes. |
| Temperature range | -50°C ~ 200°C (depending on material and pressure rating). |
| standard | Conforms to international standards such as GB, ANSI, DIN, JIS, etc. |
4. Advantages of loose flanges
Easy to install and disassemble: Loose flanges do not need to be welded directly to the pipe, but connected through a collar, which makes installation and disassembly more convenient.
Suitable for occasions that require inspection or cleaning: Loose flanges can be quickly disassembled, which is convenient for cleaning, inspection and maintenance of pipeline systems.
Reduce stress concentration: Since the loose flange will not be completely fixed on the pipeline, it can effectively reduce stress concentration caused by factors such as temperature difference and pressure change.
Flexibility: The loose flange design can adapt to some pipeline systems that require flexible coordination and can be adjusted according to changes in the pipeline.
5. Application of loose flanges
Loose flanges are very useful in some special pipeline systems, especially in occasions that require regular maintenance or inspection. Common application scenarios include:
Heat exchange equipment: For example, during the maintenance of the heat exchanger, the loose flange can be easily disassembled for internal cleaning and inspection.
Connection of pipeline equipment: Suitable for some pipeline systems with more flexible connection requirements, such as natural gas, oil, and chemical pipelines.
Systems that require frequent disassembly: such as liquid delivery systems, gas delivery systems, etc., loose flanges can greatly simplify the disassembly process and improve work efficiency.
6. Material of loose flanges
The material of loose flanges is usually selected according to the pressure, temperature and medium type of the pipeline. Common materials are:
Carbon steel: suitable for general pipeline connections, with good strength and durability.
Stainless steel: used in environments with high corrosion resistance requirements, such as the chemical, food, and pharmaceutical industries.
Alloy steel: used in high temperature, high pressure or special medium environments, with higher temperature and pressure resistance.
7. Installation of loose flanges
The installation of loose flanges is usually easier than welding flanges. The installation steps include:
Prepare the pipeline port: Make sure the pipeline end is clean and tidy, and the sealing surface does not have any impurities or defects.
Match the loose flange with the pipeline: Select the appropriate loose flange according to the pipeline size.
Install the collar: Put the inner collar into the end of the pipeline to ensure that the collar and the flange are firmly connected.
Tighten the bolts: Use bolts to connect the loose flange to other flanges, and tighten the bolts to ensure sealing.
8. Precautions for loose flanges
Sealing check: After installing the loose flange, the flange connection needs to be tested for sealing to ensure that there is no leakage.
High temperature resistance and corrosion resistance: Choose a loose flange of suitable material to ensure that it can withstand the temperature and chemical media in the pipeline.
Prevent loosening: Although the loose flange design allows a certain amount of movement, the bolts should be firmly fixed during installation to prevent loosening due to external forces.
9. Summary:
The loose flange makes pipeline connection more flexible and convenient through its unique design, which is particularly suitable for occasions that require frequent disassembly, inspection, cleaning or maintenance. According to different industries and usage environments, loose flanges of different specifications and materials can be selected to meet the connection requirements of the pipeline system.
