What are the connection methods and sealing performance of stainless steel continuous oil pipe?

The connection methods and sealing performance of stainless steel continuous oil pipes are crucial for their reliability and safety in practical applications. Below is a detailed analysis of the connection methods and sealing performance of stainless steel continuous oil pipes:

1. Connection Methods
There are various connection methods for stainless steel continuous oil pipes, mainly including the following:

Welded Connection:
Advantages: Welded connections are strong and reliable, able to withstand high temperatures and pressures, making them suitable for situations requiring high connection strength.
Disadvantages: Requires specialized technology and equipment, with high construction difficulty and difficulty in disassembly after welding.

Flanged Connection:
Advantages: Convenient for disassembly and maintenance, suitable for situations where frequent disassembly and replacement are required.
Disadvantages: Compared to welded connections, flanged connections may have slightly lower strength and sealing performance.

Quick Coupling Connection:
Advantages: Quick and convenient connection, suitable for systems with small flow rates, easy maintenance, and replacement.
Disadvantages: May not be suitable for extreme high-temperature and high-pressure environments.

Press-Fit Connection:
Principle: The thin-walled stainless steel pipe is inserted into the press-fit fitting's socket, and a special press-fit tool is used to secure the pipe inside the fitting, while an O-ring is used for sealing.
Advantages: Features leak prevention, resistance to pull-out, vibration resistance, and high-pressure resistance, making it suitable for various fluid systems.

Threaded Connection:
Principle: Pipes are connected to each other or to valves through internal and external threads.
Advantages: Simple connection, easy to operate.
Disadvantages: May not be suitable for high-pressure environments, and the sealing performance is relatively weak.

2. Sealing Performance
The sealing performance of stainless steel continuous oil pipes mainly depends on the connection method and the choice of sealing materials.

Impact of Connection Method:
Welded connections achieve sealing through the melting of metal, providing good sealing performance, but they are more difficult to construct.
Flanged connections rely on bolts and flange gaskets for sealing, and the performance depends on the quality and tightness of the gasket.
Quick couplings and press-fit connections rely on clamps or press-fit tools for sealing, and the sealing performance depends on the quality of the O-ring or sealing gasket.

Choice of Sealing Materials:
The selection of sealing materials should be based on the working environment and the nature of the conveyed fluid. For example, nitrile rubber seals are oil-resistant, wear-resistant, and heat-resistant, making them suitable for oil pipes; silicone rubber seals have high-temperature stability and weather resistance, making them suitable for high-temperature hot water or steam pipes.

Sealing Performance Testing:
In practical applications, the sealing performance of stainless steel continuous oil pipes should be tested to ensure it meets design requirements. Testing methods include pressure tests, airtightness tests, and leakage tests.