Select the appropriate type of pipe cap based on the pipe type and application, choosing from welded, threaded, clamp, or adhesive caps.
Choose a suitable material; generally, a cap made of the same material as the pipe, such as iron, stainless steel, or copper, is suitable.
Pay attention to the size and specifications of the cap; it should match the dimensions of the pipe end to ensure sealing and stability.
Consider the operating environment and requirements of the cap, such as corrosion resistance and high-temperature resistance.