Main types and characteristics of pipe caps

　　According to their different structures and shapes, pipe caps can be divided into various types, each with its unique characteristics and applicable scenarios.

　　1. Convex pipe cap

　　Convex cap is the most common type of cap, including various forms such as hemispherical, elliptical, disc-shaped, and spherical cap.

　　From the perspective of force, the hemispherical cap has the best force performance, but it is also the most difficult to manufacture; The stress performance of elliptical, disc-shaped, and spherical cap tubes gradually weakens, but the manufacturing difficulty also decreases accordingly.

　　The hemispherical cap has the strongest pressure bearing capacity among all types and is suitable for high-pressure applications;

　　The elliptical cap has good comprehensive performance and is widely used;

　　The manufacturing of disc-shaped pipe caps is relatively simple and suitable for medium and low pressure working conditions.

　　2. Cone shell and variable diameter section

　　Cone shell is a special shaped pipe cap mainly used in situations where the direction of the pipeline needs to be changed. The variable diameter section is used to connect pipes of different diameters, achieving a smooth transition in pipe diameter.

　　3. Flat cover and tight mouth design

　　The flat cover structure is simple and easy to manufacture, but its pressure bearing capacity is relatively poor, mainly used in low-pressure applications. The tight mouth design is used for specific working conditions that require reducing the diameter of the pipeline.

　　Technical parameters and standard specifications for pipe caps

　　1. Main technical parameters

　　Understanding the technical parameters of pipe caps is crucial for correct selection. The following are the main technical parameters of pipe caps:

　　·Diameter (DN): The diameter range of the pipe cap is generally DN15-DN2000, and different manufacturers may provide different specification ranges.

　　·Wall thickness: The wall thickness of the pipe cap is usually expressed in the SCH series, ranging from SCH5 to SCH160, and can also be expressed in millimeters, ranging from 2-45 millimeters.

　　·Material: Common materials for pipe caps include carbon steel (A3, 20 #, Q235, Q345B, 16Mn, etc.), stainless steel (304, 304L, 316, 316L, 321, etc.), and alloy steel (15Mo3, 15CrMoV, etc.).

　　2. Main standards and specifications

　　The production and manufacturing of pipe caps follow various international and domestic standards to ensure their quality and safety:

　　·Domestic standards: GB/T12459-2005, GB/T13401-2005, etc

　　·International standards: ASME B16.9, DIN2617, etc

　　·Industry standards: SH3408, SH3409, HG/T21635, etc

　　This standard covers the dimensions, materials, manufacturing processes, and quality requirements of pipe caps, and is an important basis for ensuring the quality and safety of pipe caps.