Connection methods for steel pipes and PPR pipes vary based on application requirements and material properties. Steel pipes commonly use threaded, welded, or flanged connections, while PPR pipes rely on push-in or compression fittings. Threaded and welded joints are preferred for steel pipes in high-pressure or structural applications due to their strength and leak resistance. Flanged connections offer flexibility for maintenance and disassembly. For PPR pipes, push-in fittings enable rapid installation without tools, whereas compression fittings provide adjustable torque for secure sealing.

The choice of connection method depends on factors like pressure, temperature, cost, and ease of maintenance. Welded steel joints, for instance, are widely adopted in oil and gas industries because they withstand extreme pressures and temperatures. According to ASME B16.9 standards, welded joints have a 98% success rate in pressure tests, making them indispensable for critical infrastructure. Threaded connections, though less durable, are cost-effective for low-pressure systems like water supply. A 2022 study by the American Society of Mechanical Engineers (ASME) found that welded steel pipes in pipeline networks experienced fewer failures compared to threaded ones, reducing maintenance costs by 25%.

For PPR pipes, push-in connections dominate residential plumbing due to their speed and simplicity. A 2023 report by the PPR Pipe Association highlighted that push-in installations cut labor time by 30% compared to compression methods. However, compression fittings are favored in commercial settings for their leak-proof performance under variable loads. Data from the report shows that properly installed PPR pipes with compression joints have a 50-year lifespan, aligning with their reputation for longevity. Push-in systems, when paired with quality tools, achieve a 95% leak-free rate, as noted in a European Water Works Association (EWWA) study. These methods balance efficiency, durability, and cost, ensuring optimal performance across industries.