In the petroleum industry, API (American Petroleum Institute) standard hoses are widely used for the transportation of liquids and gases. These hoses must comply with strict safety and performance standards to ensure reliability in high-pressure and corrosive environments. The connection method of API petroleum hoses is crucial for ensuring the sealing, safety, and durability of the system. The following are several common connection methods for API petroleum hoses:

 
1、 Threaded connection
Thread connection is the most common API petroleum hose connection method. The connection is achieved by matching the thread at the end of the hose with the corresponding device's thread interface. This connection method is simple and easy to operate, making it easy to install and disassemble.
Direct threaded connection: The end of the hose is directly machined with internal or external threads that match the pipeline or equipment, and can be directly screwed in or out.
Screw flange connection: The end of the hose is equipped with threads, which are connected to the flange with corresponding threaded holes, and then tightened with bolts to achieve a sealed connection.
Conversion joint threaded connection: When the threads between the hose and the equipment do not match, a conversion joint can be used to adapt to different thread specifications, thereby achieving connection.
 
2、 Flange connection
The flange connection is suitable for connecting large-diameter API petroleum hoses, providing strong support and a higher pressure rating. Flange connections are usually used for permanent or semi permanent connections, as their disassembly and reinstallation are time-consuming and labor-intensive.
Flat flange connection: Both ends of the hose are equipped with flat flanges, which are tightly fixed together by bolts and nuts to achieve connection.
Convex/concave flange connection: One or both ends of the hose are equipped with convex or concave flanges, which are combined with the corresponding concave or convex flanges on the equipment and tightened with bolts to achieve a sealed connection.
 
3、 Quick connector connection
Quick connect is a convenient connection method that allows hoses to be quickly connected or disconnected in a short period of time, making it very suitable for applications that require frequent hose replacement.
Manual quick connector: By manually operating the handle or lever, the locking mechanism inside the connector is connected or separated from the hose connector.
Pneumatic/hydraulic quick connectors: Using pneumatic or hydraulic power sources to drive, automatic connection or disconnection of hoses and connectors is achieved, improving work efficiency.
 
4、 Clamp connection
Clamp connections are suitable for some low-pressure applications or convenient on-site adjustments. Fix the connection between the hose and the joint with clamps made of metal or other materials. This method is simple and fast, but may not be suitable for withstanding high pressure.
 
5、 Welding connection
Welding connection provides a durable and stable connection method, especially suitable for environments that require extremely high sealing and durability. The hose is directly connected to the joint or equipment through welding, forming an integrated structure.
 
6、 Conclusion
Choosing the appropriate API oil hose connection method is the key to ensuring the safe and efficient operation of the oil transportation system. Each connection method has its specific application scenarios, advantages, and limitations. When selecting the connection method, it is necessary to consider the working pressure, fluid type, operating frequency, and specific on-site conditions. The correct connection method can ensure the safety, reliability, and economy of oil transportation operations, while reducing maintenance costs and potential operational risks.